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Hi All, I am modelling a unitary equipment with single speed DX cooling coil, electric heat coil, and Fan ON/Off. If I look at the run time fraction of fan and the heating coil (fraction calculated as Heating Coil Air Heating Rate W/ DesPer 1:Des Heat Cap [W]), it is same. The fraction for cooling coil (Cooling Coil Total Cooling Rate W/DesPer 2:Des Tot Cool Cap [W]) is different than the fan run time fraction. Question - Am I calculating the fraction for cooling coil correctly? If yes, what could be the reason for the difference between the runtime fractions of cooling coil and fan? Thanks, -Rohini

Hi All, I am modelling a unitary equipment with single speed DX cooling coil, electric heat coil, and Fan ON/Off. If I look at the run time fraction of fan and the heating coil (fraction calculated as Heating Coil Air Heating Rate W/ DesPer 1:Des Heat Cap [W]), it is same. The fraction for cooling coil (Cooling Coil Total Cooling Rate W/DesPer 2:Des Tot Cool Cap [W]) is different than the fan run time fraction. Question - Am I calculating the fraction for cooling coil correctly? If yes, what could be the reason for the difference between the runtime fractions of cooling coil and fan? Thanks, -Rohini

Hi All, I am modelling a unitary equipment with single speed DX cooling coil, electric heat coil, and Fan ON/Off. If I look at the run time fraction of fan and the heating coil (fraction calculated as Heating Coil Air Heating Rate W/ [W] (Each Call)/ DesPer 1:Des Heat Cap [W]), it is same. The fraction for cooling coil (Cooling Coil Total Cooling Rate W/DesPer [W] (Each Call)/DesPer 2:Des Tot Cool Cap [W]) is different than the fan run time fraction. Question - Am I calculating the fraction for cooling coil correctly? If yes, what could be the reason for the difference between the runtime fractions of cooling coil and fan? Thanks, -Rohini

Hi All, I am modelling a unitary equipment with single speed DX cooling coil, electric heat coil, and Fan ON/Off. If I look at the run time fraction of fan and the heating coil (fraction calculated as Heating Coil Air Heating Rate [W] (Each Call)/ DesPer 1:Des Heat Cap [W]), it is same. The fraction for cooling coil (Cooling Coil Total Cooling Rate [W] (Each Call)/DesPer 2:Des Tot Cool Cap [W]) is different than the fan run time fraction. Question - Am I calculating the fraction for cooling coil correctly? If yes, what could be the reason for the difference between the runtime fractions of cooling coil and fan? Thanks, -Rohini