hi Fixed 26.356 24.678 3 Fixed 0.079 0.085 3 ρr hr Fixed 13.750 2.948 3 COPadj Fixed 3.07 1.95 1 and 2 Table 360: Strip Curtain Calculation Assumptions for Refrigerated Warehouse Component Type Value Source new Fixed 0.89 1 old Fixed 1 with Pre-existing curtain 0.58 with no Pre-existing curtain 0.00 unknown 0.54 CD Fixed 0.425 1 topen (minutes/day) Fixed 494 1 A (ft2) Fixed 80 1 H (ft) Fixed 10 1 Ti (°F) Fixed 59 1 and 2 Tr (°F) Fixed 28 1 Fixed 0.076 3 ρi hi Fixed 20.609 3 Fixed 0.081 3 ρr hr Fixed 9.462 3 COPadj Fixed 1.91 1 and 2 Sources: The scale factors have been determined with tracer gas measurements on over 100 walk-in refrigeration units during the California Public Utility evaluation Commission’s of the 2006-2008 CA investor owned utility energy efficiency programs. The door-open and close times, and temperatures of the infiltrating and refrigerated airs are taken from short-term monitoring of over 100 walk-in units. For refrigerated warehouses, we used a bin calculation method to weight the outdoor temperature by the infiltration that occurs at that outdoor temperature. This tends to shift the average outdoor temperature during times of infiltration higher (e.g. from 54 °F average to 64 °F). We also performed the same exercise to find out effective outdoor temperatures to use for adjustment of nominal refrigeration system COPs.
hi Fixed 26.356 24.678 3 ρr Fixed 0.079 0.085 3 hr Fixed 13.750 2.948 3 COPadj Fixed 3.07 1.95 1 and 2 Table 360: Strip Curtain Calculation Assumptions for Refrigerated Warehouse Component Type Value Source new Fixed 0.89 1 old with Pre-existing curtain with no Pre-existing curtain unknown Fixed 0.58 0.00 0.54 1 CD Fixed 0.425 1 topen (minutes/day) Fixed 494 1 A (ft2) Fixed 80 1 H (ft) Fixed 10 1 Ti (°F) Fixed 59 1 and 2 Tr (°F) Fixed 28 1 ρi Fixed 0.076 3 hi Fixed 20.609 3 ρr Fixed 0.081 3 hr Fixed 9.462 3 COPadj Fixed 1.91 1 and 2 Sources: The scale factors have been determined with tracer gas measurements on over 100 walk-in refrigeration units during the California Public Utility Commission’s evaluation of the 2006-2008 CA investor owned utility energy efficiency programs. The door-open and close times, and temperatures of the infiltrating and refrigerated airs are taken from short-term monitoring of over 100 walk-in units. For refrigerated warehouses, we used a bin calculation method to weight the outdoor temperature by the infiltration that occurs at that outdoor temperature. This tends to shift the average outdoor temperature during times of infiltration higher (e.g. from 54 °F average to 64 °F). We also performed the same exercise to find out effective outdoor temperatures to use for adjustment of nominal refrigeration system COPs.
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