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Click Here To Use a Selection Program When it asks for login and password">
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Click Here To Use a Selection Program When it asks for login and password, just select CANCEL General Sizing Formulas
USE THE FOLLOWING FORMULAS TO DETERMINE YOUR CHILLER NEEDS. SPECIFIC HEAT OF WATER = 1 SPECIFIC HEAT OF OIL (DTE24) AVG. = .486 BTU = (WEIGHT X SPECIFIC HEAT X DELTA T) / TIME PER HOUR BTU/H= GPM X 500 X DELTA T FOR WATER BTU/HR = GPM X 243 X DELTA T FOR HYDRAULIC OIL, WT.=7.2#/GAL, SPECIFIC HEAT = .486 (DTE24 OIL ONLY) BTU/HR = GPH (DISTILL RATE) X 1500 (FOR DISTILLING OF PERCHLOROETHYLENE TYPICAL SIZING FOR MOTOR HORSEPOWER HEAT REMOVAL THIS FORMULA IS BASED ON 40% HEAT REJECTION OF MOTOR HP TO HEAT THIS FORMULA WORKS ONLY WHEN THE PUMP MOTOR IS THE SOLE SOURCE OF HEAT. THIS FORMULA IS TYPICAL FOR 85-90% OF APPLICATIONS. BTU = HP X 2543 - 60% EXAMPLE: 20 HP MOTOR = 20 X 2543 = 50,860 BTU /HR ASSUME 40% OF THIS LOAD IS REJECTED AS HEAT 50,860 - 60% = 20,344 BTU/HR TO BE REMOVED IF SEVERAL MOTORS ARE COMBINED IN THE SAME CIRCUIT ADD ALL HP AND DEDUCT 60% FOR THE TOTAL BTU TO BE REMOVED. EXAMPLE: 12HP, 15HP, 7HP, 4HP PUMP MOTORS IN ONE CIRCUIT. 12+15+7+4 = 38 TOTAL HP 38 X 2543 = 96,364 BTU/HR ASSUME THE 40% RULE 96,634 - 60% = 38,654 BTU/HR TO BE REMOVED BELOW IS A QUICK REFERENCE CHART FOR CHILLER SIZE TO HP REMOVAL TYPICAL SIZING FOR MOTOR HORSEPOWER HEAT REMOVAL (chart # 3.5B) TOTAL HP CHILLER MODEL TONNAGE CAPABLE BTU REMOVAL MOTOR HP EQUIVALENT 8.75 RC-0.75 0.75 9000 BTU/HR 3.5 @40% 11.75 RC-1 1.00 12,000 BTU/HR 4.7 @40% 17.5 RC-1.5 1.50 18,000 BTU/HR 7 @40% 23.5 RC-2 2.00 24,000 BTU/HR 9.4 @40% 35 RC-3 3.00 36,000 BTU/HR 14 @40% 44.25 RC-4 4.00 48,000 BTU/HR 17.7 @40% 59 RC-5 5.00 60,000 BTU/HR 23.6 @40% 88.5 RC-7.5 7.50 90,000 BTU/HR 35.4 @40% 117.5 RC-10 10.00 120,000 BTU/HR 47 @40% 141.5 RC-12 12.00 144,000 BTU/HR 56.6 @40% HOW TO READ CHART: DETERMINE TOTAL HP IN SYSTEM. LOCATE CLOSEST HP IN RED FROM CHART. (NOTE: ALWAYS CHOOSE THE HP IN BLUE THAT IS EQUAL TO OR HIGHER THAN YOUR TOTAL HP.) FOLLOW CHART FROM LEFT TO RIGHT TO DETERMINE PROPER CHILLER MODEL, CAPACITY, AND ACTUAL HP NEEDED TO BE REMOVED AT THE 40% RULE. EXAMPLE: A) 10 HP PUMP MOTOR IN SYSTEM…CHART SELECTION = 11.75. CHILLER SELECTION IS RC-1 TO REMOVE UP TO 4.7 TOTAL HP. EXAMPLE: B) 10HP + 7HP + 15HP PUMP MOTORS IN ONE SYSTEM = 32HP TOTAL…CHART SELECTION = 35. CHILLER SELECTION IS RC-3 TO REMOVE UP TO 14 TOTAL HP. IF UNSURE OR QUESTIONS ARISE, FILL OUT THE CHILLER MFG. QUOTE FORM WITH AS MUCH KNOWN DATA AS POSSIBLE AND FAX TO 812-285-5508. OR CALL 800-334-2665
Copyright 2004 Chiller Mfg. Inc.
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