20
AGZ 026B through 130B
IOMM AGZ-5
Table 12, Capacity and Power Derates, Models AGZ 075 to 130
Fouling Factor
Chilled Water
Delta T
0.0001 (0.0176)
0.00025 (0.044)
0.00075 (0.132)
0.00175 (0.308)
Altitude
°F °C Cap. Power Cap. Power Cap. Power Cap. Power
6 3.3 0.990 0.997 0.976 0.994 0.937 0.983 0.868 0.964
8 4.4 0.994 0.998 0.981 0.995 0.942 0.984 0.872 0.965
10 5.6 1.000 1.000 0.987 0.996 0.947 0.986 0.877 0.967
12 6.7 1.005 1.001 0.991 0.997 0.951 0.986 0.881 0.968
14 7.7 1.009 1.002 0.995 0.998 0.955 0.987 0.884 0.968
Sea
Level
16 8.9 1.013 1.004 1.000 1.000 0.960 0.989 0.889 0.970
6 3.3 0.987 1.005 0.974 1.002 0.934 0.991 0.865 0.972
8 4.4 0.992 1.006 0.979 1.003 0.940 0.992 0.870 0.973
10 5.6 0.997 1.008 0.984 1.004 0.944 0.994 0.875 0.975
12 6.7 1.002 1.009 0.989 1.005 0.949 0.994 0.879 0.975
14 7.7 1.007 1.011 0.993 1.007 0.953 0.996 0.883 0.977
2000 feet
16 8.9 1.011 1.012 0.998 1.008 0.958 0.997 0.887 0.978
6 3.3 0.985 1.014 0.972 1.010 0.933 0.999 0.864 0.980
8 4.4 0.991 1.015 0.977 1.012 0.938 1.001 0.869 0.981
10 5.6 0.995 1.016 0.982 1.013 0.943 1.002 0.873 0.982
12 6.7 1.000 1.018 0.987 1.014 0.947 1.003 0.877 0.984
14 6.8 1.005 1.019 0.991 1.015 0.951 1.004 0.881 0.985
4000 feet
16 8.9 1.009 1.021 0.995 1.017 0.955 1.006 0.884 0.987
6 3.3 0.982 1.023 0.969 1.020 0.930 1.009 0.861 0.989
8 4.4 0.988 1.025 0.975 1.022 0.935 1.010 0.866 0.991
10 5.6 0.992 1.026 0.979 1.022 0.940 1.011 0.870 0.992
12 6.7 0.997 1.028 0.984 1.024 0.944 1.013 0.875 0.994
14 7.7 1.002 1.029 0.989 1.025 0.949 1.014 0.879 0.995
6000 feet
16 8.9 1.006 1.031 0.992 1.027 0.952 1.016 0.882 0.996
6 3.3 0.979 1.034 0.966 1.031 0.927 1.019 0.859 1.000
8 4.4 0.984 1.036 0.971 1.032 0.932 1.021 0.863 1.002
10 5.6 0.990 1.037 0.976 1.033 0.937 1.022 0.868 1.002
12 6.7 0.993 1.039 0.980 1.035 0.941 1.024 0.871 1.004
14 7.7 0.998 1.041 0.985 1.037 0.945 1.026 0.875 1.006
8000 feet
16 8.9 1.003 1.041 0.990 1.038 0.950 1.026 0.879 1.007
Evaporator Freeze Protection
Evaporator freeze-up can be a concern in the application of air-cooled water chillers.
To protect against freeze-up, insulation and an electric heater cable are furnished with
the unit. This protects the evaporator down to -20°F (-29°C) ambient air temperature.
Although the evaporator is equipped with freeze protection, it does not protect water
piping external to the unit or the evaporator itself if there is a power failure or heater
cable burnout. Consider the following recommendations for additional protection.
1. If the unit will not be operated during the winter, drain evaporator and chilled
water piping and flush with glycol. Drain and vent connections are provided on the
evaporator to ease draining.
2. Add a glycol solution to the chilled water system to provide freeze protection.
Freeze point should be approximately ten degrees below minimum design ambient
temperature.
3. The addition of thermostatically controlled heat and insulation to exposed piping.
4. Continuous circulation of water through the chilled water piping and evaporator.
Содержание AGZ026BS
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