Heat Controller HEV Series - Part Load Correction Factors

Design Guide HEV-HEH SEriES Heat Controller
22
22
Engineering Design Guide HEV/H SERIES Heat Controller, LLC
Heating
Entering
Air DB°F
Heating
Capacity
Power
Heat of
Extraction
50 1.023 0.773 1.084
55 1.021 0.827 1.068
60 1.016 0.882 1.049
65 1.009 0.940 1.026
70 1.000 1.000 1.000
75 0.989 1.063 0.971
80 0.978 1.128 0.941
Air ow Cooling Heating
% of
Rated
Total
Capacity
Sensible
Capacity
S/T Power
Heat of
Rejection
Heating
Capacity
Power
Heat of
Extraction
80
%
0.980 0.917 0.936 0.955 0.975 0.979 1.035 0.965
85%
0.986 0.939 0.953 0.964 0.982 0.984 1.021 0.975
90%
0.992 0.961 0.969 0.975 0.988 0.990 1.011 0.984
95%
0.996 0.981 0.985 0.986 0.994 0.995 1.004 0.993
100%
1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000
105%
1.003 1.017 1.014 1.016 1.005 1.006 1.002 1.007
110%
1.004 1.031 1.027 1.033 1.010 1.011 1.006 1.012
Cooling
Entering
Air
WB°F
Total
Capacity
Sensible Cooling Capacity Multiplier -
Entering DB °F
Power
Heat of
Rejection
65 70 75 80 85 90 95 100
45 0.628 * *******1.010 0.698
50 0.712 * *******1.008 0.767
55 0.797 1.026 * *****1.006 0.835
60 0.882 0.669 0.894 1.111 *****1.003 0.904
65 0.966 0.693 0.890 1.092 1.298 * * * 1.001 0.973
67 1.000 0.640 0.810 1.000 1.202 * * * 1.000 1.000
70 1.051 0.706 0.862 1.060 1.298 * * 0.999 1.041
75 1.135 0.633 0.860 1.087 1.314 1.541 0.996 1.110
Air Flow Correction Table
Entering Air Correction Table
Part Load Correction Factors
* = Sensible capacity equals total capacity
AHRI/ISO/ASHRAE 13256-1 uses entering air conditions of Cooling - 80.6°F
DB/66.2°F WB,
and Heating - 68°F DB/59°F WB entering air temperature