Table : Strip Curtain Calculation Assumptions for Refrigerated Warehouses Term Unit Values Source , Efficacy of the new strip curtain an efficacy of 1 None 0.89 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 0.58 1 with Pre-existing curtain 0.00 with no Pre-existing curtain 0.54 unknown Discharge Coefficient: empirically determined scale None 0.425 1 factors that account for differences between infiltration as rates predicted by application and actual Bernoulli’s law observed infiltration rates Minutes walk-in door is open per day 494 1 , Doorway area 80 1 , Doorway height 10 1 , Dry-bulb temperature of infiltrating air, Rankine 59 1 and 2 = Fahrenheit + 459.67 , Dry-bulb temperature of refrigerated air, Rankine 28 1 = Fahrenheit + 459.67 , Density of the infiltration air, based on 55% RH 0.076 3 , Enthalpy of the infiltrating air, based on 55% RH. 20.609 3 , Density of the refrigerated air, based on 80% RH. 0.081 3 , Enthalpy of the refrigerated air, based on 80% RH. 9.462 3 , Time-dependent (weather dependent) coefficient of None 1.91 1 and 2 performance of the refrigeration system. Based on nominal COP of 1.5 for freezers and 2.5 for coolers. The most appropriate evaluation protocol for this measure is verification of installation coupled with assignment of stipulated energy savings according to store type. The strip curtains are not expected to be installed directly. As such, the program tracking / evaluation effort must capture the following key information: Fraction of strip curtains installed in each of the categories (e.g. freezer / cooler and store type) Fraction of customers that had pre-existing strip curtains
Table : Strip Curtain Calculation Assumptions for Refrigerated Warehouses Term Unit Values Source , 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 0.89 1 Efficacy of the old strip curtain with Pre-existing curtain with no Pre-existing curtain unknown None 0.58 0.00 0.54 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 0.425 1 Minutes walk-in door is open per day 494 1 , Doorway area 80 1 , Doorway height 10 1 , Dry-bulb temperature of infiltrating air, Rankine = Fahrenheit + 459.67 59 1 and 2 , Dry-bulb temperature of refrigerated air, Rankine = Fahrenheit + 459.67 28 1 , Density of the infiltration air, based on 55% RH 0.076 3 , Enthalpy of the infiltrating air, based on 55% RH. 20.609 3 , Density of the refrigerated air, based on 80% RH. 0.081 3 , Enthalpy of the refrigerated air, based on 80% RH. 9.462 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 1.91 1 and 2 The most appropriate evaluation protocol for this measure is verification of installation coupled with assignment of stipulated energy savings according to store type. The strip curtains are not expected to be installed directly. As such, the program tracking / evaluation effort must capture the following key information: Fraction of strip curtains installed in each of the categories (e.g. freezer / cooler and store type) Fraction of customers that had pre-existing strip curtains
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