ML20058J559
| ML20058J559 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 10/14/1993 |
| From: | Starks V HOUSTON LIGHTING & POWER CO. |
| To: | |
| Shared Package | |
| ML20058J460 | List: |
| References | |
| MC-6412, NUDOCS 9312140156 | |
| Download: ML20058J559 (72) | |
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I C -a).3Fl STP 3053 (10/91j OEP-3 m CALC NO. S C - IMI 2-SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION PRELIM.
HOUSTON LIGHTING & POWER COMPANY FINAL < '
CALCULATION COVER SHEET volo IfL BUILDING / AREA / SYSTEMS:
bH UNIT:
SUBJECT:
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OBJECTlVE SEE SHT ~l I
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t Mc-6412 39,,(LI,)
- SHT OF U PROJECT REV. PREPARERIDATE REVIEWERIDATE ELECTRICGENERATINGSTATION i
HOUSTONLIGHilNG & POWER o g ,_ ,f.,y g,g fcf77 ~
GENERAL COMPUTATION SHEET d SUBJECT UNIT ls ./
EAB supply header flows & battery supply header flows are taken from Appendix H.
Train Supolv Header Flow, cfm Rat 3erv Header Flow, cfm A 34447 3425 B 26688 2046 C 37884 2443 h
Supply Fan Flow = (34447+26688+37884)/2 = 49510 cfm Makeup flow = (3425+2046+2443)/2 = 3957 cfm Return fan flow = 49510-3957 = 45553 cfm ;
Because train C supply fan flow is greater than C header supply flow, 49510-37884 = 11626 cfm of fan C discharge mixes with fan B j discharge (supply header cross train flow). !
The recirculated portion of train C header = ' 37884-2443 = 35441 l cfm.
Because the return fan flow is higher than 35441 cfm, the flow l from train B to train C return fan = 45553-35441 = 10112 cfm _
Because all of the C header flow is from the C coil outlet, the C 1 header temp. = 58.21 'F The sum of all emergency (battery backed) lights in the train'C i area is 2592 watts x 3.413 Watts / btu /hr + 12000 btu / ton-hr
= 0.737 tons (from Appendix I)
However, since non-1E power is not lost, the emergency lighting does not come on. Therefore the "use factor" = 0 Values for class 1E equipment, class IE cables, normal lighting, non-1E equipment, and non-1E cables are likewise from Appendix I.
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i 9 r- 41 -) 40 [ cJ%)
- " " " ' " CALC NO. SHT OF SOUTHTEXAS PROJECT REV. PREPARERIDATE REVIEWERlDATE ELECTRICGENERATINGSTATION HOUSTON UGHTING & POWER o gg fcg fJ M n/r/u '
GENERAL COMPUTATION SHEET l
SUBJECT UNITls The use factor for non-1E cables is less than 1, based on the re-evaluation of non-1E equipment in DCN EC-73 of Ref. 7. Before !
the DCN, the total non-1E equipment load was 94~220 watts (from Appendix J). After the DCN, the total non-1E equipment load is 70964 watts (from Appendix I). The ratio is 70964/94720 = .749 Therefore, it is reasonable and conservative to apply a use l l factor of 0.8 to the train C non-1E cable load. j l The total train C area heat load = 0.74*0 + 17.52*1 + 12.00*1 +
10.12*1 + 20.19*1 + 7.55*0.8 = 65.86 tons Train C return header temp.
= 58.21 + 65.86 tons
- 12000 btu / ton hr = 78.67 *F 1.09
- 35441 f The train B return fan receives a mixture of trains A & B return air for an average temperature of 69.56 *F. The B return header and B return fan inlet ducts are very closely in-line, so the A & j B flow would actually mix before the flows split to the B fan inlet & C fan inlet.
C train return fan inlet = 78.67*35441 + 69.56*10112 = 76.56 *F l
(35441 + 10112)
The heat added by the return fan = 15.77 tons (from App. F). j The heat added by the supply fan = 36.242 tons ( )
j i Delta T across the return fan = 15.77 tons *12000 btu / ton hr 1.09*45553
= 3.81 *F Temperature at supply fan inlet = 45441*f76.65+3.81) + 3957*95 (45441+3957)
= 81.62 *F 1
Mc-6412 41 of d A ) l 5"'"* CALC NO. SHI 0F l SONHIDGS PROJECT REV. PREPARERIDATE REVIEWERIDATE [
ELECTRICGENERATINGSTAil0N t HOUSTON UGHilNG & POWER e Vg p 9,g m qjg GENERAL COMPUTATION SHEET ,
SUBJECT UNIT ls :
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Delta T across supply fan = 36.242 tons
- 12000 btu / ton.hr j 1.09*49510 i
= 8.06 *F ;
l Cooling coil inlet temperature = 81.62 + 8.06 = 89.68 *F The latent load = 4840
- 3957 * (139 - 66) = 16.64 tons i 7000 grains /lb*12000 btu / ton hr :
i The coil " thermal effectiveness" is based on sensible heat ,
transfer. The majority of condensation will occur on the coilder coils, which increase the water temperature seen by the rest of j the coils. We assume the chilled water inlet temperature available for sensible heat transfer is actually: {
52 + 16.64 tons
- 12000 btu / ton +hr = 52.67 *F l 500 lb/hr gpm
- 600 gpm
- 1.0 btu /lb *F ;
The coil effectiveness, c = 0.8503 (App. B) i Neglecting correction to scfm, Cmin = Cair = Cp
- lb/hr air i lb/hr air = 0.075 lb/ft 3
- 60 min /hr
- cfm (ft /3 min)
Cp of air varys slightly with moisture content. Use C, = 0. 24 2 j as representative of conditions in EAB and other conditioned l spaces.
Cmin = 0.242*0.075*60*cfm = 1.09*cfm f Q = Cmin*c*(Tair in - Tchwtr in) btu /hr I
Q = Cair * (Tair in - Tair out) also
, l or Tair out = Tair in - Q/Cair j
= 89.68 - .8503*(89.68 - 52.67) = 58 21 *F l l
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MC-6412 42 [d'#M
""""**) CALC NO. SHT OF SOUTHTEXAS PROJECT REV. PREPARERlDATE REVIEWERIDATE j ELECTRICGENERATINGSTAil0N HOUSTONLIGHTING& POWER o Q '
ig qy s g f g /f , i GENERAL COMPUTATION SHEET ;
SUBJECT UNIT ls i
If we had not made s Ich a good guess to start with, the we would l iterate the process with this value as the new trial coil outlet ,
temperature.
l f
The sensible cooling load
= 1.09*49510*(89.68-58.21)/12000 = 141.53 tons l
.i Total coil load = sensible load + latent load
= 141.53 + 16.64 = 158.17 tons ,
[ Note: the last digit can differ because the spreadsheet retains more significant digits than is printed or is used in this hand r calculation.] j
- 2. CONTROL ROOM ENVELOPE Makeup flow = 1105 cfm from Appendix H.
Makeup fan heat into air = 0.8058 tons from Appendix F.
Heaters for makeup filter units = 4.5 KW from Ref. 5.
Air temperature at filter Outlet
= 95 + 0.8058*12000 + 4.5 KW
- 3413 btu /KW hr = 115.8 *F 1.09*1105 1.09*1105 This_is not recorded on the spreadsheet because the air mixes before being introduced into the separate trains.
Avg. Temp.=95+(0.8058+0.7766)*12000+(4.5+4.5)*3413 = 116.19 *F 1.09*(1105+1047) 1.09*(11.05+1047)
Makeup to train = 1047 + 1105 = 1076 cfm 2
Cleanup fan flow = 5912 cfm from Appendix H Return fan flow = 16132 cfm from Appendix H
Mc-6412 43 ob d B l ;
STP 361(1248)
CALC NO. SHT OF SOUTHTEXASPROJECT REV. PREPARERIDATE REVIEWERJDATE ELECTRICGENERATINGSTATION l HOUSTON UGHTING & POWER 0 gj_ le-4-tJ M <o /, ' /n GENERAL COMPUTATION SHEET ,
SUBJECT UNITis j i
Use a trial return air temperature of 65.38 'F ;
Return fan heat input to air stream = 6.5688 tons (App. F) i Return fan outlet temperature = 65.38 + 6.5688*12000 = 69.86 *F ,
1.09*16132 l Cleanup fan inlet temperature
- F
= O .86*(5912-1076) + 116.19*1076 = 78.29 _
5912 Cleanup fan heat to air = 3.0141 tons from App. F. -
i Cleanup fan outlet temp = 78.29 + 3.0141*12000 = 83.90 *F 'l 1.09*5912 ;
Coil inlet flow = 16132 + 1076 = 17208 cfm ;
Coil inlet temp. = 5912*83.90 + (17208-5912)*69.86 = 74.68 *F 17208 'I i
Cair = 1.09*17208 = 18757 btu /hr+F I Coil effectiveness for sensible heat transfer = 0.9478 (App. B)
{
Latent load from personnel = 0.4 tons (Ref. 13) ,
Latent load = 4840*1076*(139-66) + 0.4 = 4.93 tons l 7000*12000 Note: The 66 grain humidity was based on expected EAB )
coil outlet conditions. The same value is used for other coils, including the control room coil, ,
for convenience. At 54 *DB & 53 *WB, the. outlet I humidity is 58 grains. Thus the latent load is underestimated by about 0.5 tons. !
The personnel latent load should be divided by the number of operating trains, or 2 in this case. ,
The combined error is 0.3 tons, which is not significant and which will be offset in other coils.
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Mc-6412 44 [tl1l
""*"* CALC NO. SHT OF SOUTHTEXASPROJECT REV. PREPARERIDATE REVIEWERIDATE ELECTRICGENERATINGSTATION
! HOUSTON UGHTING & POWER D y g93 g yjg GENERAL COMPUTATION SHEET SUBJECT UNIT ls Effective chill water inlet temp. = 52 + 4.93*12000 = 52.70 *F 500*168 Sensible load = Cmin
- c * (74.68-52.70)
= 18757
- 0.9478 * (74.68-52.70) = 32.56 tons 12000 Coil outlet temp. = 74.68 - 32.56*12000 = 53.85 *F 18757 Surply fan heat to air = 7.257 tons (App. F)
Supply fan outlet temp. = 53.85 + 7.257*12000 = 58.49 *F 1.09*17208 The flow from A, B, & C trains are mixed for the supply header temperature.
= 0.0*0.0 + 18486*58.64 + 17208*58.49 = 58.57 *F (0 + 18486 + 17208)
Electrical loads are from Appendix I, except for the Reheater load. This replaces the non-1E equipment load. The I & C equipment loads are not easily separated into class 1E and non-class 1E portions, so the entire load has been considered class 1E. The reheater load is included in its place. Three operable reheaters are installed in the control room supply headers, for a maxinum load of:
= (43 kw + 60 kw + 5 kw)*3413 btu /kw.hr = 30.72 tons I 12000 These are de-energized by an SI signal, so the use factor for steady state analysis is 0.
Personnel sensible load = 0.5 tons (per Ref. 13).
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MC-6412 45 d 44 B l wm 02* CALC NO. SHT 05' SOUTH TEXAS PROJECT REV. PREPARERIDATE REVIEWERIDATE ;
ELECTRICGENERATINGSTAilON HOUSTON LIGHTING & POWER 3 OfL.
g_y_. 9 3 g 4.jg j GENERAL COMPUTATION SHEET SUBJECT UNIT ls The cleanup and supply fans are centrifugal, so motor heat is rejected into the equipment rooms. This load is lumped into the total load, which is easier than trying to separate these loads into the correct coil. The loads are similar so the error is small. It is conservative because train C is the liraiting train and the actual train C fan motor heat loads are less than average.
The total header sensible load
= 19.33 + 0.5 + .818 + 0.771 + 0.338 + 0.320 = 22.08 tons j Total header flow = 18486 + 17208 = 35694 cfm Return header temp. = 58.57 + 22.08*12000 = 65.38 *F 1.09*35694 This equals the trial temperature. Otherwise, the calculated temperature would be the new trial temperature, and so on.
Total coil load = 32.56 tons + 4.93 tons = 37.49 tons
CCW pump bhp @ 13000 gpm = 780 hp (Ref. 33)
Motor efficiency = 0.943 (Ref. 34)
Motor heat to room = 780 hp * (1-0.943)
- 746 watts /hp 0.943
= 35200 watts Essential Chilled Water Pump flow = 954 gpm (Ref. 38)
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z MC-6412 4 6 blp,( - f STP 361(1248) -
SOUTHTEXASPROJECT ELECTRICGENERATINGSTATION REV. PREPARERlDATE REVIEWERlDATE j
- HOUS10NLIGHTING & POWER g 4 ,,_y_,3 gay) 7,j,ju '
GENERAL COMPUTATION SHEET SUBJECT UNITis ,
Essential Chilled Water Pump bhp 9 954 gpm = 50 hp (Ref. 36) j Essential Chilled Water Pump motor efficiency = 0.937 (Ref. 37) >
i Motor heat to room = 50 hp * (1-0.937)
- 746 watts /hp (0.937)
= 2508 watts j Note: Higher values were used for both CCW pump motor and ;
Chilled water pump motor based on preliminary estimates !
(39305 watts & 4610 watts respectively). The higher values have been retained because they are conservative j and have little affect on the results.
The CCW Supplemental Cooler contains 3 fans, each with 1.5 bhp. t Motor efficiency = 0.80 (Ref. 32 F) l Heat to room = 3
- 1.5 ho
- 746 watts /hp = 4196 watts j 0.80 chiller Area Supplemental Cooler 1 fan 0 3.7 bhp, motor eff. = 0.829 (Ref. 32H) r Heat to room = 3.7 hp
- 746 watts /hp = 3330 0.829 300 ton chiller compressor maximum input = 354 KW (Ref. 57) {
Motor efficiency = 0.946 (Ref. 37) l Heat to room = 354 KW * (1-0.946)
- 1000 watts /KW = 19116 watts The chiller control panel would also release heat, say 1000 watts Total = 20116 = 20156 watts used from preliminary input j l
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Mc-6412 47 84), \ l snw o2* CALC NO. SHT OF SOUTHTEXAS PROJECT REV. PREPARERlDATE REVIEWERIDATE ELECTRICGENERATINGSTATION HOUSTON LIGHTING & POWER v gff f o_gg y g f og/g GENERAL COMPUTATION SHEET SUBJECT UNIT ls The 150 ton essential chiller is hermetically sealed, so heat losses from the motor are removed by refrigerate to the condenser. The chiller does have a control panel and lube oil heater (when idle), so a small heat load is present. 1 Preliminary input used 1500 watts with a "use factor" of 0.8, which looks reasonable for the control panel and oil heater.
Lighting, electrical equipment, & cable loads are from Ref. 11.
Conduction load is from Ref. 15. (0 in this case)
The use factor for conduction is taken as 0 because normal MAB cooling is not lost in this scenario, so adjacent rooms will not heat up. s Piping heat load is from Ref. 15.
The total heat load in the room
= 180*0 +0*1 +1503*1 +2116*1 +0*1 +2790*1 +0*0 +0*0 +39305*1 '
+4610*1 +20156*1 +1500*0.8 +4196*1 +3330*1 = 79306 watts Room vent flow = 1300 cfm This is design flow from Ref. 14.
Comparable Unit 2 spreadsheets used MAB final air balance data, which was close to the design value.
Vent temp. = 65 "F (Ref. 22)
Vent constant = 1.09*1300 cfm = 1417 Air flow to CCW supplemental cooler = 25748 cfm (Ref. 30)
Design ECW flow = 36 gpm (Ref. 32F)
ECW temperature of 100 *F is 1 degree higher than Tech Spec limit for ECP temperature. This scenario is within the first 30 minutes following a LOCA and ECW discharged to the ECP takes much longer to circulate back to the intake.
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i Mc-6412 48 b 3)-
"""" CALC NO. SHT OF !
SOUTHTEXAS PROJECT REV. PREPARERIDATE REVIEWERIDATE ELECTRICGENERATINGSTATION
( HOUSTONLIGHilNG & POWER o g{ f,_y_qg cg9_ foj7j7, ,
GENERAL COMPUTATION SHEET SUBJECT UNIT Is The thermal-effectiveness of the CCW supplemental coil is c=0.8237 from Appendix B.
The AHU constant is the lower of 500*gpm*c or 1.09*cfm*c ,
f 500*36 = 18000 < 1.09*25748 = 28065 therefore AHU constant = 500*36*0.8237 = 14827 The chilled water AHU air flow = 3491 cfm (Ref. 30)
Chilled water design flow = 40'gpm (Ref. 32H) l Chilled water inlet temperature = 52 *F from case input j i
Thermal effectiveness of coil = 0.7778 from Appendix B AHU constant = C3= 1.09
- 3491
- 0.7778 = 2960 ;
Note: Only in the ESF Pump Room and CCW Supplemental Coolers- ;
does the cooling water have_a chance to set Cmin. Most l other AHU in the spreadsheet do have.the decision process to ;
select Cmin. I Latent load = 0 because conditioned air is supplied from the MAB -
j system.
i T,, = 7 92 06 watts
- 3. 413 btu / watt .hr +14 827 *100 +2960
- 52 +1417
- 65 l (14827 +2960 +1417) :
T = 104.1 *F J
Chilled water sensible load = 2L960* (104.1 - 52) = 12.85 tons ,
12000 btu / ton.hr i Total chilled water coil load = 12.85 + 0 = 12.85 tons Note: The two coolers in this room act together. The CCW l supplemental cooler basically keeps room temperature slightly higher than ECW inlet temperature, while the load on the-chilled water coil is determined by the room temperature. The actual ~ :
room heat loads-have very'little affect on the load to the l chilled water train. {
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Mc-6412 49 [ 4 0,)
"*"2" CALC NO. SHT OF SOUTHTEXAS PROJECT REV. PREPARERlDATE REVIEWERIDATE ,
ELECTRICGENERATING STATION HOUSTONUGHTING & POWER e Vi u-y_5) M eg/73 GENERAL COMPUTATION SHEET SUBJECT UNIT Is ELECTRICAL PENETRATION ROOM. Train C. EAB 301 4.
Electrical heat loads are from Ref. 7.
The normal AHU is running per the scenario.
6.3 hp
- 746 watts /hp
- 1/0.672 = 6994 watts (Ref. 26) i Essential AHU load to air 8.2 hp
- 746 watts /hp
- 1/0.838 = 7300 watts (Ref. 3)
Conduction load = 0 per assumptions 6 & 7.
Piping load = 0 per Ref. 12.
L Total room load = 50676 watts Vent flow = 830 cfm per design ,
Vent temp. = 65 *F (Ref. 22)
Roon vent constant = 1.09
- 830 = 904.7 Normal AHU fan flow is assumed to O because the normal and emergency AHU fans share common ductwork and the emergency fan .
has considerably higher static pressure. Therefore the normal i fan may be " shut-off" and be unable to move air.
Emergency AHU flow = 7241 cfm (Eef. 30)
Design chill water flow to coil = 78 gpm (Ref. 32F)
Coil effectiveness = 0.8006 per Appendix B Coil const. = 1.09 *07451
- 0.8006 = 6319 i
Latent load = 0 T,,= 507 67
- 3 0413 +6319
- 52 +904.7*65 = 77.6 'F !
(6319 +904.7) load to chilled water = 6319 * (77.6 - 52)/12000 = 13.47 tons ,
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Mr-6412 50 b!?s l sTeasiore CALC NO' SHT OF SOUTH TEXAS PROJECT ELECTRICGENERATINGSTATiON REV.l PREPARERIDATE REVIEWERIDATE HOUSTON UGHTING & POWER o f g _fy g foffj7, GENERAL COMPUTATION SHEET SUBJECT UNITis l S. ESF PUMP ROOM. TRAIN C, FHB 004 !
Electrical loads are taken from Ref. 10 -j Conduction load = 0 (Ref. 18)
Note: Trains A & B have a steady state conduction load for /(
the spent fuel pit, which is above the Train A room and >
partially above the Train B room.
i Conduction = 2376.2 b/hr with SFP O 125 *F and room ,
104 (Train A), per Ref. 18 Consideration of initial transient loads indicate a !
reduced initial room temperature is necessary if only ;
the 300 ton chiller is available. It is conservative !
I to use this 75 'F room temperature for conduction load in all cases for this room.
Room FHB 006, Train A ESF Room Conduction ,
= 2376.2 b/h * (125 - 75)
- 1 watts = 1658 watts -j (125-104) 3.413 b/h l l
Similarly, for FHB 005, conduction j
= 1139.2 * (125 - 75)
- 1 = 795 watts -
(125 - 104) 3.413 Piping heat load = 136012 b/h (Ref. 18)
= 136012
- 1/3.413 = 39851 watts !
l Note: The piping heat load was calculated-assuming a room j temperature of 120 *F, whereas the steady state room i temperature is much less than 120 'F. Thus this l portion of the load is underestimated by 3 to 4 tons. i Overall the transient load is limiting by more than l '
this margin, so this calc. will not be iterated to reflect actual room temperature. ,
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MC-6412 51Dhl3]
8'""'**' CALC NO. SHT OF SOUTHTEXAS PROJECT REV. PREPARER 1DATE REVIEWER 1DATE ELECTRICGENERATINGSTAT10N HOUSTON UGHTING & POWER o 4 j,._ y_ ff C/G to/p/u GENERAL. COMPUTATION SHEET SUBJECT UNIT is HHSI pump, Train C l'
BHP near runout = 880 hp (Ref. 8)
Motor officiency = 0.949 (Ref. ) ,
heat load to room = 880 hp
- 746 watts /hp * (1-0.949) 0.949
= 35280 watts t
U1SI pump BHP near runout = 405 hp (Ref. 8)
Motor eff. = 0.931 (Ref. 8) heat load to room = 405
- 746 * (1-0.931) = 22392 watts 0.931 The Containment Spray pump and motor are identical to the UISI pump.
Air Handling Unit has 2 fans 0 3.5 bhp each Motor eff. = 0.82 (Ref. 32F) ,
load to room = 2
- 3.5 hp
- 746 watts /hp
- 1 / 0.82
= 6358 watts Net room load = 133187 watts Room vent flow = 1208 cfm (Ref. 29)
Inlet air temperature = 95 'F from outside 1
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I MC-6412 52 [sJS)
- ""*' CALC NO. SHT OF f SOUTHTEXAS PROJECT :
ELECTRICGENERATINGSTATION REV. PREPARERIDATE REVIEWERIDATE HOUSTON LIGHTING & POWER o g g gy @ ujg/g {
GENERAL COMPUTATION SHEET SUBJECT UNITls i Note: While non-1E power is still available, the SI signal opens the FHB inlet bypass dampers, which closes the l normal-inlet dampers and trips the supply fans. ;
'i Room vent const. = 1.09
- 1208 = 1317 AHU air flow = 34050 cfm (Ref. 29) ,
t Chill water flow (desirjn) = 62.5 gpm (Ref. 32F) i Chill water temperature = 52 *F per initial input Note: Chill water flow to this AHU is ch*.ged in a subsequent ;
section. A lower flow is desirable to minimize the ;
transient load immediately after starting the AHU. The l 3
higher flow is conservative for steady state purposes. ;
Coil effectiveness = 0.8258 from Appendix B i
Cmin
- c, ?
C3 = Cmin = lesser of Cair or Cwater Cair = 1.09*34050 = 37115 i Cwater = 500*62.5 = 31250 i Use Cwater .{
- C3 = 31250
- 0.8258 = 25806 i Latent heat load = 4840
- 1208 cfm * (139-66) = 60970 b/h .j 7000 grains /lb l Note: This assumes the coil outlet humidity obtained from 58
- F Dry Bulb E 57 *F Wet Bulb for the EAB coils. The outlet temperature for these coils will be higher than 58 *F Dry Bulb. This also assumes the room humidity :
equals the coil outlet humidity, whereas the room I humidity is higher than coil outlet humidity. Both l factor increase the calculated latent load relative to l actual conditions and are therefore conservative. !
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Mc-6412 53of'4Si
" " " " CALC NO. SHT OF SOUTHTEXASPROJECT REV. PREPARERIDATE REVIEWERIDATE ELECTRICGENERATiNGSTAil0N HOUSIONUGHTING & POWER p g g g afgg j GENERAL COMPUTATION SHEET SUBJECT UNilis l Effective Chilled Water Temperature = 52 + 60970 = 53.95 *F ;
500*62.5 Ty , = 13 3187
- 3. 413 +1317 *95 +25806*53.9 5 = 72.70 *F l (1317 + 25806) {
Coil sensible load = 25806 * (72.70 - 53.95) = 40.32 tons l 12000
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Total load = 40.32 + 60970 = 45.40 tons ;
l 12000 I Calc. No. MC-5275 and Ref. 23 both indicate a very j Note:
small available margin in the AHU, whereas this i i
calculation shows a huge margin. It is obvious that vendor data from Ref. 32F was misinterpreted. The heat i transfer data in Ref. 32F is for only one of the two j coils installed in the air handling unit. This can be j readily seen by calculating heat transfer from air ;
flow.
Note: The actual ventilation flows to the 3 ESF pump rooms per Refs. 29 (Unit 1) and 45 (Unit 2) are very- i different from the design ventilation flows, and very different from each other. The result is a big [
difference in latent load between different rooms. It is noted that MC-5275 did not consider latent loads in l 1 the ESF pump rooms. )
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- 6. ESF SUMP VAINE ROOM. TRAIN C, FHB 009 The method is the same as the previous room, with the exception ;
of the vent temperature. In the emergency modo, air is exhausted ;
from this room via the exhaust ducting, but the supply fans are j tripped & supply fan inlet dampers are closed. The only source !
of air is transfer air from the ESF pump room. Thus the inlet air temperature is the same as the ESF pump room temperature [
calculated in the previous example. The latent load is taken as
' O because moisture in the air has been removed in the ESF pump rooms.
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MC-6412 54 [t-l E l ,
m m n2" CALC NO. SHT OF SOUTHTEXAS PROJECT REV. PREPARERIDATE REVIEWERIDATE ELECTRIC GENERATING STATION HOUSTON UGHilNG & POWER c, V1 9 W f) N /o/#/b GENERAL. COMPUTATION SHEET SUBJECT UNIT is _
- 7. OPENT FUEL PIT PUMP ROOM. TRAIN C, FHB 107 Electrical load are from Ref. 10.
Piping heat load is from Ref. 18, converted to watts. l SFP Pump bhp = 172 (Ref. 41) ,
motor eff. = 0.930 (Ref. 41) heat to room = 172 hp
- 746 watts /hp * (1-0.93) = 9658 watts 0.93 AHU fan bhp = 0.54 (Ref. 321) motor eff. = 0.689 (Ref. 3) heat to room = 0.54
- 746
- 1/ .0689 = 585 watts Note: This AHU is actually outside the room and the fan motor may be outside the conditioned space. This would decrease the heat load slightly, but the value used is conservative.
Total room load = 14909 watts Room ventilation in emergency = 680 cfm (Ref. 29) t Room ventilation temperature is 95 *F.
Room ventilation constant = 1.09
- 680 = 741.2 Note: This is the only case, in either unit, in which the air handling unit air flow is significantly less than the design air flow.
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l MC-6412 55 [t.)S l N- SHI OL UTHT S PROJECT ELECTRICGENERATINGSTAil0N REV. PREPARERIDATE REVIEWERiDATE l HOUSTON UGHilNG & POWER 3 gjg 3_gy gp fopjg
/
GENERAL COMPUTATION SHEET ,
SUBJECT UNIT is Chill water flow = 12 gpm (Ref. 32I)
Coil effectiveness = 0.7559 from Appendix B coil constant = 1.09
- 680
- O.7559 = 560 Latent load = 4840
- 680 * (139 - 66) = 34320 b/h 7000 Note: This is more than twice the actual latent load because it ignores the humidity removed by exhaust flow.
Because the ventilation flow is the same as the AIIU -
r flow, the humidity removed by the exhaust will exceed the humidity removed by the AliU. This overestimates latent load on the coil and is conservative.
Effective chilled water temperature = 52 + 34320 = 57.72 *F 500*12 T,, = 14 9 0 9
- 3. 413 +7 41. 2
- 9 5 + 5 6 0
- 57. 7 2 = 118. 0 6 *F (741.2 + 560)
Sensible load = _560 * (118.06 - 57.721 = 2.82 tons 12000 Total load = 2.82 + 34320/12000 = 5.68 tons This is the only room in either unit where the steady state temperature approaches the design temperature.
Mc-6412 56 [4:3l !;
""*"'"' CALC NO. SHT;- OF ,
SOllTH TEXASPROJECT ,
REV. PREPARERlDATE RtVIEWER10 ATE ELECTRICGENERATINGSTATION i HOUSTONLIGHTING & POWER p y,yj_ p_ q,. 9 g f,j g {
GEMRAL COMPUTATION SHEET !!
j SUBJECT UNITls
- 8. RADWASTE CONTROL ROOM. TRAIN C. MAB 217 1 Electrical loads are from Ref. 11. 1 l
Conduction load and piping load are from Ref. 15, converted to watts. However, the "use factor" for conduction is taken as zero ;
because MAB IWAC is available.
Personnel load is from Ref. 15.
AHU bhp = 9.2 hp (Ref. 32.J) ;
motor eff. = 0.845 (Ref. 3) f heat to room = 9.2
- 746
- 1/0.845 = 8122 watts Total room load = 24375 watts ,
room ventilation flow = 2000 cfm -(Ref. 14) room ventilation temperature = 65 *F (Ref. 22) 2 room ventilation constant = 1.09
- 2000 = 2180 !
J AHU cfm = 16519 (Ref. 30) l Chill water flow to coil = 49 gpm (Ref. 32J) l coil effectiveness = 0.4739 per Appendix B i
coil constant = 1.09
- 16519
- 0.4739 = 8533 l l
i latent load = 0 ,
b 4
Q 9
4
Mc-6412 57 Oftf">> l
A N- SHT OF
'NTHEE s 9 PROJECT REV. PREPARERIDATE REVIEWERIDATE ELECTRICGENERATINGSTATION HOUSTON UGHTING & POWER o yf_ g GENERAL COMPUTATION SHEET SUBJECT UNIT ls T = 24375*3.413 + 2180*65 + 8533*52 = 62.40 (2180 + 8533) coil sensible & total load = 8533 * (62.4 - 521 = 7.40 tons 12000 This AHU is considerably oversized. Also, the room does not contain safety related equipment (Ref. 22). If chiller capacity is limited, this AHU could be electrically disabled to reduce both steady state and transient load.
- 9. OTHER ROOMS The remaining rooms use the same methods and the same or comparable references. The only room with a different twist (for this scenario) is MAB 226. This room contains redundant B & C AHU's, which are both operable in the case being analyzed (loss of A train Safety Injection) . This is the same down to calculation of room temperature. If both AHU's are operable per the particular scenario, the total room load is adjusted by adding the AHU fan load from train B and including the train B AHU constant in the room temperature equation.
- F T,, = J 2 0 6 4 + 2_16
- 1. 0 )
- 3 . 4 L3 + 2 3 9
- 5 2 + 6 8 7 . 7
- 6 5 + 2 3 9
- 5 2 = 6 6. 3 5 (239 + 686.7 + 239) coil sensible load = 239 * (66.35 - 52) = 0.29 tons 12000 B. FAILURE OF ONE CHILLED WATER TRAIN Failure of a chilled water pump or a single chiller leaves one EAB fan train and one Control Room fan train running without cooling chilled water flow until operator action is taken to restore the normal lineup. The control room fan adds heat to the operating coils. In the EAD, the air in the affected train will mostly be recirculated without cooling, because the air exchange between air distribution trains is limited. In this the heat absorbed by EAB room walls will limit the heatup until operator action is taken.
l L_ l
n MC-6412 58 6 44 3 \
- * "*** CALC NO. SHT OF SOUTHTEXAS PROJECT REV. PREPARERIDATE REVIEWERIDATE .l ELECTRICGENERATINGSTAil0N i HOUSION LIGHTING & POWER p v4 9_y_4y g gjyg GENERAL COMPUTATION SHEET SUBJECT UNITls l The spreadsheet in Appendix G tabulates floor areas and volumes J j
for each room in the EAB, and totals the areas served by each train. The length and width of each room is not tabulated. i However, the minimum perimeter can be found assuming each room is square.
W = width = length = (area)%
Thus a low estimate of the surface area of each room (walls, j
ceiling and floor) is. !
H = height (ft.) = Vol.
area ,
I Surface Area = area
- 2 + 4 * (area)*
- H j The surface areas for rooms in the EAB served by each train i
header are totaled in Appendix G.
l Assume walls are 1 ft. thick (most walls are at least 1 ft. -
thick). i From Ref. 31, the heat transfer properties of concrete are:
.: 5 k = 0.54 btu /hr.ft.*F ;
i Cp = 0.20 btu /lbm.*F l density = 144 lbm/ft 3 l a = 0.019 f t2 /hr Surface conductance for concrete = 1.5 btuf f t2 .hr.*F i
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l MC-6412 59 [d >,) l
"'""2" CALC NO. SHI OF I SOUTHTEXAS PROJECT REV. PREPARERIDATE REVIEWER 10 ATE ELECTRICGENERATINGSTAil0N HOUSTON UGHTING & POWER 3 4 c_y.9 % fgg GENERAL COMPUTATION SHEET l I
SUBJECT UNiiis
- 1. Loss of " Train A" Chilled Water System (See Appendix M4 for summary, File M4 for complete results)
This scenario results in all 3 trains of EAB & CR envelope fans running, but no cooling from the A train coils.
In the EAB, most of the heat load in A train areas will be absorbed in the walls. The small amount of air exchanged between fan trains limits the affects on the other EAB trains.
In the control room envelope, the extra fan train sharply increases the load on the two active coils.
Rooms that contain A & B or A & C air handling units see an increased load on the other coil.
This particular scenario has an interesting twist for the EAD HVAC system. The four trains of QDPS are located in rooms 015, 015B, 015C, & 015D. These rooms are on the 10 ft. elevation and receive air from only the "A" distribution header. If the "A" fan is running but "A" chilled water is not, these rooms will receive only warmer air.
The A train return header temperature = 63.71 *F in dual train normal operation (from a following section).
Case M4 header load = 61.76 tons return fan = 15.60 tons supply fan = 36.40 tons total = 113.76 tons delta temp. across fan train == 4.52 + 14.23 = 14.23 *F The A train area has at least 125000 f t' of wall, floor, &
ceiling at an initial temperature of 63.7 *F.
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Mc-6412 60 [c131
" * " ' " CALC NO. SHI OF i 1
SOUTHTEXASPROJECT l REV. PREPARERIDATE REVIEWERIDATE ELECTRICGENERATINGSTATION HOUSTON UGHIlNG & POWER o g('
- g_y_ c ggg -
GENERAL COMPUTATION SHEET SUBJECT UNIT is Using charts from section 4.5 of Ref. 31: !
]
k = 0.54 = 0.72 .;
h*L 1.5*0.5 The ratio of surface temperature (wall temp.) to centerline '
temperature after 30 minutes (0.5 hrs) is taken from figure 4-9. ,
j T(x.t) - T_ = 0.56 for x/L = 1. 0 (x=0 is centerline)
T(0,t) - T. l l
at t= 0.5 hrs. at/L2 = 0.19*0.5/(0.5)2 = 0.038 {
from fig. 4-8, temperature at centerline has not changed. j T ( 0, t) -T, = 63. 7 - 77. 9 = -14. 2 'F T ( 0. 5, t ) -T, = 0. 5 6 * (-14 . 2 ) = -7.95 *F 4 T ( 0, t) -T, = T, g -T re T ( 0. 5, t) -T, = T,,g g -
T,,
Iwatt T room "
Iroca T_at t
= 0.56 .t T et - T room (T room - T ,g) l Conduction from room to wall = h
- A * (T ra - T ,,gg) !
Ventilation load = 1.09
- cfm * (Tair.in - Trm) [
i For Quasi steady state ,
Qventilation + Qelectric = Qconduction ;
I
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a i
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k a i f
-- ~ , . ,- - t
MC-6412 61r[t!%]
STP 36 t (1248)
SOUTHTEXAS PROJECT REV. PREPARERIDATE REVIEWER 1DATE ELECTRICGENERATINGSTATlON HOUSTONUGHTlNG & POWER o Q y-g qy a n i g jp, GENERAL COMPUTATION SHEET SUBJECi UNIT ls Q conduction = 1.09*38778*14.2 + 61.76 = 112 tons 12000 Qconduction = h
- A * ( T,, - Tutt) = 112 tons
- 12000 b/hr. ton h*A=1.5* 125000
( T, - Tnt t ) = 112*12000 = 7.15 *F 1.5*125000 0.56*(T re - T,g) = 7.15 Tg = 63.7 *F T ra = 63.7 + 7.15/.56 = 76.5 *F Tair.in = 76.5 + 14.2 = 90.7 *F Use 91 *F for " trial coil outlet" in Appendix M4 spreadsheet.
Look at rooms 015, 015B, 015C, & 015D Total elect. load = 16500 watts
- 3.413 b/hr. watt = 56300 b/h Total wall area (minimum) = 2191 +1060 +865 +1060 = 5176 ft2 air flow = 3100 +1170 +1170 +1170 = 6610 cfm delta temp. at design air flow = 56300/(1.09*6610) = 7.8 *F Initial wall temperature ~ 58 + 8 = 66 *F Try room temperature = 88 *F T = 88
Mc-6412 62 bl:31
" * " ' " CALC NO. SHI' OF !
SOUTHTEXAS PROJECT REV. PREPARERIDATE REVIEWERIDATE ELECTRICGENERATINGSTATION
- t . HOUSTON LIGHTING & POWER 6 VfM F Y-13 @ ty@
- GENERAL COMPUTATION SHEET :
f SUBJECT UNIT Is !
T ( 0, t) -T, = Tct -T room
= 66 -88 = -22 T ( 0. 5, t) -T = T,g g -
T,, = -2 2
- 0 . 5 6 = -12 . 3 Wall temperature = 88-12.3 = 75.7 Qconduction = 1.5*5176*(88-75.7) = 95500 b/h l Qvent. = 1.09*6610*(92-88) = 28800 b/h l Qelect. = 56300 b/h ,
95500 > 28800 + 56300, therefore with air supply temperature of r' 92 *F, the room temperature would be r
below 88 *F. ;
i Per discussion with Ron Falstreau (I&C Cognizate Engineer): !
[
- QDPS is qualified up to 135 *F j
+ The temperature inside the cabinets runs 13 to 15 *F l higher than room temperature.
The Limiting Condition for Operation (LCO) for the QPDS rooms l requires an engineering evaluation within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> if the temperature inside the QDPS cabinets exceeds 110 *F.for more than [
8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. In this case the temperature inside the cabinets could -
exceed 94 *F for a brief period (roughly 10 to 20 minutes) but the temperature would not exceed 110 *F and would not approach the maximum qualified temperature of 135 *F.
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3 MC-6412 63 f,h 31 l
- "** CALC NO. SHT OF SOUTHTEXASPROJECT REV. PREPARERIDATE REVIEWERf DATE ELECTRICGENERATING STATION HOUSTON UGHTING & POWER o 44 p_y_cy Q r ff/9.y GENERAL COMPUTATION SHEET SUBJECT UNIT is ,
- 2. Loss of B Train Chilled Water I The rooms served by the B train EAB ventilation header serve only B train equipment. Thus we are only concerned with the posstble affect of higher B train temperatures on Trains A & C chiller loads.
Return header temperature = 59.38 'F initially (Section VII.E.1)
From M5 spreadsheet:
B header load = 37.63 tons return fan = 16.93 tons supply fan = 36.47 tons Total = 91.03 tons delta temp. across fan train =4.91 + 9.73 = 14.6 *F Area > 32400 f t' B return hender flow = 30303 cfm ventilation load = 1.09
- 30803
- 14.6 / 12000 = 40.85 tons 40.85 + 37.63 = 78.5 tons T, ,-Tgg = 78.5
- 12000 = 19.4 *F 1.5
- 32400 T rm -T gi = 0. 5 6 * ( T,,-Tg) = 19,4 T ra = 19.4/0.56 + 59.4 = 94.0 T,i y == 94.0 + 14.6 = 108.6 Use 110 *F as " trial coil outlet" temp. for B train EAB coil in case MS.
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i MC-6412 64 of43l j
, STP361(12-88)
SOUTHTEXAS PROJECT i REV. PREPARERIDATE - REVIEWERIDATE i ELECTRICGENERATINGSTATION HOUSTONLIGHTING & POWER o y,[ fo_,f_g cgf) f g/g/g j i
- GENERAL COMPUTATION SHEET ,
i SUBJECT UNIT is
- 3. Loss of C Train Chilled Water C return header temperature = 65.86 'F' l
'I header load = 65.86 tons 'i e
~
delta temp. across fans = 4.57 + 9.67 = 14.24 *F l area > 74512 ft" 4 C header flow = 44301 cfm l Ventilation load to area = 1.09*44301*14.2 = 57.1 tons l 12000 i
ventilation load + elect. load = 57.1 + 65.9 = 123 tons ,
T,,-T .t w t
= 123
- 12000 = 13.3 *F l 1.5
- 74212 ;l i
T rm -Twatt = 0.56*(T rm -Tet) = 13.3 T,, = 13 . 3/ 0 . 5 6 + 6 8. 6 = 9 2 . 4 ;
Ty pty
= 92.4 + 13.3 = 106.6 Use 107 *F as " trial coil outlet" temp. for B train EAB coil in case MS. I i
5 4
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REV. PREPARERIDATE REVIEWERlDATE EC RC ENER Tit GSTAil0N
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( HOUSTON UGHilNG & POWER 0 #4 fo-5-9) dea u/r/t.7 !
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REV. PREPARERIDATE REVIEWERlDATE ELECTRICGENERATINGSTATION ,
-( HOUSTON LIGHTING & POWER D V9/._ p.51J M /c/r/n GENERAL COMPUTATION SHEET SUBJECT UNITls 1
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SOUTHTEXAS PROJECT REV. PREPARERIDATE REVIEWERlDATE ;
ELECTRICGENERATINGSTATION
'( HOUSTONLIGHilNG & POWER D g}_ io.y 3 Czt.& e./r/py .
GENERAL COMPUTATION SHEET :
SUBJECT UNIT ls I
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SOUTHTEXAS PROJECT REV. PREPARERlDATE REVIEWERIDATE -
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SUBJECT UNIT Is f
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(. HOUSTONLIGHTING & POWER 0 ilL so-5-4) de.3 /*/r/y; ;
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ELECTRICGENERATINGSTATION
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STP 361(1248) CALC NO. gc 0y/2. sgi f 2-- OF431 1 SOUTHTEXASPROJECT REV. PREPARERIDATE REVIEWERlDATE ELECTRICGENERATINGSTATION ( HOUSTONLIGHilNG & POWER D f/4 /o-5 '/3 N /a/r/rr GENERAL COMPUTATION SHEET J SUBJECT UNIT ls 4 a 1 h 41Iffama AcdAlwh l f[uu cu.t ,vv sn
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(- HOUSTON UGHTING& POWER o # /o-r /J Cab (=/r/ty GENERAL COMPUTATION SHEET l- SUBJECT._ UNIT Is L% Q% Ty = 48 + hTy , = 5t30 *F 970 \A ~b o = 51.30 - 7,22 63.0 7 "P dAuW W-llbS^6 C& 1 Tmt) TR A t tJ TR Aitl A B C it.B(o 11.32-I AT 3co 12.2 7 R4 VN T. 59.B L Go.17 59.32-6Twa 'l. 'l l 9. I B 7.55 5(.15 sz.oB St.78-
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~ ELECTRICGENERATING STATION
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- GENERAL COMPUTATION SHEET i
SUBJECT ' UNITis 9
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-( HOUSTON UGHTING & POWER D J// /o-5-43 Cee--/oA/ey GENERAL COMPUTATION SHEET SUBJECT UNITis F
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CALC. NO. MC-6412 SHT. OF I [bpA/tst N IO f8 8/
$tJ 0LD. tuls)J 1 i FACE VEL 600 2 l CAT B/H/ SOFT 10300 3 f DELTAT to 4 5
TAtR_IN 88 6 TAIR_OUT 72.3 7 l 8 ; VTUBE 2
.I WTR OUT 55 9 TWIN_
45 10 f TFACTOR 45.03126 11 TWTR_EFF 45.03126 12 .; CR 0.634951 13 $ EFFECTIVENESS 0.365382 14 l XFACTOR 1.10008 15 ;l EFFPASS 0.215167 16 17 , i LMTD 30.04331 18 : SENSIBLE O 68162.31 19 U (uncorrected) 7.853983 20 j CORR. FACTOR 0.993179 21 i GAMMA 0.153839 22 ; NTU/ PASS 0.263084 23 l U 7.907921 24 ; ho*Efin 11.69355 25 ho 12.51192 26. f GPM 13.67521 27 TUBE OD 0.645 28 TOTAL,B/H 68376.07 29 SENSI.B/H 68162.31 30 f LENGTH,1N 79.66144 31 f OD 0.645 32 l 1D 0.591 33 NA 8 34 NR 2 35 i NF 8 36 ! FT 0.01 37 i
- 11. ' 79.66144 38 SCFM 3983.072 39 l
HREF 12.6527 40 GREF 5148.741 41 'l N 0.576505 42 ; KTUBE 228 43 l 1
CALC. NO. MC-6412 SHT.106 opp ;y ._3 5_yy [g,g 44 KFIN 228 NW 8 45 ;
. TFILM 50 46 :
Ri 0.0003 47 ! HH 12 48 ; TT 0.027 . 49 ! WW 79.66144 50 . DD 3 51 ! - AFIN 272.372 52 l AOTUBE 16.50073 53 > ATOTAL 288.8727 54 , AITUBE 16.43399 55 + ARATIO 17.57776 56 ! MINFA 3.481205 57 FACEAREA 6.638453 58 l MASSAIR 17923.82 59 I FACEVEL 600 60 l G 5148.741 61 HAIR 12.6527 62 i
- M 11.54064 63 FINL 0.041283 64 .
, ML 0.476426 65 FINEFF 0.930631 66
- ETAo 0.934593 67 AWALL 17.18478 68 Rw 0.000166 69 ;
Ri 0.0003 70 ; HWTR 495.161 71 l UCOIL 7.967876 72 ! Cair 4341.548 73 l Cwtr 6837.607 74 ; Cmin 4341.548 75 ; Cmax 6837.607 76 i CRATIO 0.634951 77 ! NTU 0.530157 78 ; NTU/NR 0.265078 79 j 4 GAMMA 0.15491 80 E EPASS 0.21649 81 i 1.211905 82 ; 83 } i EFFECTIVENESS 0.365382 84 ! THEFF 0.367283 85 i-
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.(- ee& to/rhe HOUSTONLIGHilNG & POWER 3 W/d to-I-13 GENERAL COMPUTATION SHEET :
SUBJECT UNITis ; t M Nhh,,,) kw1, 0 -> /0 da.EL l l/hm 44f 90 i i
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- ELECTRIC GENERATING STATION
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& fo-5-fJ Co9-1c/r/if l GENERAL COMPUTATION SHEET j SUBJECT UNITis ,
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- I HOUSTON UGHTING & POWER D //h 65-O Ce r=/t /; a ,
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