23.05 6755517_09 21
13 CORRECTION FACTORS
CORRECTIVE FACTORS FOR AVERAGE WATER TEMPERATURES DIFFERENT FROM NOMINAL VALUES
The pressure drops are calculated with an average water temperature of 50.0 °F (Cooling mode), 109.4 °F (Heating or recovery mode)
System side heat exchanger
Cooling mode Heating mode or recovery
Average water temperatures
°F 41.0 50.0 59.0 68.0 86.0 104.0 122.0 73.4 82.4 91.4 100.4 109.4 118.4 127.4 134.4
Correction factor
1.02 1.00 0.98 0.97 0.95 0.93 0.91 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0.97
FOULING: DEPOSIT CORRECTIVE FACTORS K*M²/W
0,0 0,00005 0,0001 0,0002
Corrective factor of cooling capacity 1,0 1 0.98 0.94
Corrective factor of imput power 1,0 1 0.98 0.95
14 GLYCOL
ETHYLENE GLYCOL
Cooling mode
CORRECTION FACTOR WITH ETHYLENE GLYCOL - COOLING MODE
Freezing Point °F 0 25.47 21.02 15.93 10.20 3.67 –3.89 -12.62 -22.79 -34.78
Percent ethylene glycol % 0 10 15 20 25 30 35 40 45 50
Qwc – 1.000 1.033 1.040 1.049 1.060 1.072 1.086 1.102 1.120 1.141
Pc – 1.000 0.990 0.985 0.980 0.975 0.970 0.965 0.960 0.955 0.950
Pa – 1.000 0.996 0.994 0.992 0.990 0.988 0.986 0.984 0.982 0.980
Δp – 1.000 1.109 1.157 1.209 1.268 1.336 1.414 1.505 1.609 1.728
Heating mode range
CORRECTION FACTOR WITH ETHYLENE GLYCOL - HEATING MODE
Freezing Point °F 0 25.47 21.02 15.93 10.20 3.67 -3.89 -12.62 -22.79 -34.78
Percent ethylene glycol % 0 10 15 20 25 30 35 40 45 50
Qwh – 1.000 1.027 1.038 1.050 1.063 1.078 1.095 1.114 1.135 1.158
Ph – 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000
Pa – 1.000 1.002 1.003 1.004 1.005 1.007 1.008 1.010 1.012 1.015
Δp – 1.000 1.087 1.128 1.175 1.227 1.286 1.353 1.428 1.514 1.610
PROPYLENE GLYCOL
Cooling mode
CORRECTION FACTOR WITH PROPILENE GLYCOL - COOLING MODE
Freezing Point °F
0 25.83 22.46 18.61 14.04 8.46 1.65 -6.65 -16.67 -28.70
Percent propilene glycol %
0 10 15 20 25 30 35 40 45 50
Qwc –
1.000 1.007 1.006 1.007 1.010 1.015 1.022 1.032 1.044 1.058
Pc –
1.000 0.985 0.978 0.970 0.963 0.955 0.947 0.939 0.932 0.924
Pa –
1.000 0.996 0.994 0.992 0.990 0.988 0.986 0.984 0.982 0.980
p –
1.000 1.082 1.102 1.143 1.201 1.271 1.351 1.435 1.520 1.602
Heating mode range
CORRECTION FACTOR WITH PROPILENE GLYCOL - HEATING MODE
Freezing Point °F 0 25.83 22.46 18.61 14.04 8.46 1.65 -6.65 -16.67 -28.70
Percent propilene glycol % 0 10 15 20 25 30 35 40 45 50
Qwh – 1.000 1.008 1.014 1.021 1.030 1.042 1.055 1.071 1.090 1.112
Ph – 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000
Pa – 1.000 1.003 1.004 1.005 1.007 1.009 1.011 1.014 1.018 1.023
Δp – 1.000 1.050 1.077 1.111 1.153 1.202 1.258 1.321 1.390 1.467
Attention: Avoid adding the glycol in the hydraulic circuit near the pump intake. A high concentration of glycol and additives above the permissible limits can block the pump: do
not use the pump as a mixer.
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