Table 3109: Strip Curtain Calculation Assumptions for Convenience Stores Values Term Unit Cooler Freezer Source , Efficacy of the new strip curtain an efficacy of None 0.79 0.83 1 – 1 corresponds to the strip curtain thwarting all infiltration, while an efficacy of zero corresponds to the absence of strip curtains. Efficacy of the old strip curtain None 1 with Pre-existing curtain 0.58 0.58 with no Pre-existing curtain 0.00 0.00 unknown 0.34 0.30 Discharge Coefficient: empirically determined None 0.348 0.421 1 scale factors that account for differences between infiltration as rates predicted by application and actual observed Bernoulli’s law infiltration rates Minutes walk-in door is open per day 38 9 1 , Doorway area 21 21 1 , Doorway height 7 7 1 , Dry-bulb temperature of infiltrating air, Rankine 68 64 1 and 2 = Fahrenheit + 459.67 , Dry-bulb temperature of refrigerated air, 39 5 1 Rankine = Fahrenheit + 459.67 , Density of the infiltration air, based on 55% 0.074 0.075 3 RH , Enthalpy of the infiltrating air, based on 55% 25.227 23.087 3 RH. , Density of the refrigerated air, based on 80% 0.079 0.085 3 RH. , Enthalpy of the refrigerated air, based on 80% 13.750 2.081 3 RH. , Time-dependent (weather dependent) None 3.07 1.95 1 and 2 coefficient of performance of the refrigeration system. Based on nominal COP of 1.5 for freezers and 2.5 for coolers.
Table 3109: Strip Curtain Calculation Assumptions for Convenience Stores Term Unit Values Source Cooler Freezer , Efficacy of the new strip curtain – an efficacy of 1 corresponds to the strip curtain thwarting all infiltration, while an efficacy of zero corresponds to the absence of strip curtains. None 0.79 0.83 1 Efficacy of the old strip curtain with Pre-existing curtain with no Pre-existing curtain unknown None 0.58 0.00 0.34 0.58 0.00 0.30 1 Discharge Coefficient: empirically determined scale factors that account for differences between infiltration as rates predicted by application Bernoulli’s law and actual observed infiltration rates None 0.348 0.421 1 Minutes walk-in door is open per day 38 9 1 , Doorway area 21 21 1 , Doorway height 7 7 1 , Dry-bulb temperature of infiltrating air, Rankine = Fahrenheit + 459.67 68 64 1 and 2 , Dry-bulb temperature of refrigerated air, Rankine = Fahrenheit + 459.67 39 5 1 , Density of the infiltration air, based on 55% RH 0.074 0.075 3 , Enthalpy of the infiltrating air, based on 55% RH. 25.227 23.087 3 , Density of the refrigerated air, based on 80% RH. 0.079 0.085 3 , Enthalpy of the refrigerated air, based on 80% RH. 13.750 2.081 3 , Time-dependent (weather dependent) coefficient of performance of the refrigeration system. Based on nominal COP of 1.5 for freezers and 2.5 for coolers. None 3.07 1.95 1 and 2
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