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Walk-in Coolers and Freezers Prescriptive Measures and Baseline for Energy Cost Budget (EAc1)

Item

Attribute

Prescriptive Measures

Baseline

Envelope

Freezer insulation

R-46

R-36

Cooler insulation

R-36

R-20

Automatic closer doors

Yes

No

High efficiency low/no heat reach-in doors

40W/ft (13.12 W/mm) of door frame (low temperature) 17W/ft (5.58 W/mm) of door frame (medium temperature)

40W/ft (13.12 W/mm) of door frame (low temperature) 17W/ft (5.58 W/mm) of door frame (medium temperature)

Evaporator

Evaporator fan motor and control

Shaded pole and split phase motors are prohibited. Use PSC or EMC motors.

Constant speed fan

Hot gas defrost

Yes, no electrical defrosting

Electric defrost

Condenser

Air cooled condenser fan motor and control

Shaded pole and split phase motors are prohibited. Use PSC or EMC motors. Add condenser fan controllers

Cycling one speed fan

Air cooled condenser design approach

Floating head pressure controls or ambient sub-cooling

10°F to 15°F (-12.2°C to -9.4°C) dependent on suction temperature

Lighting

Lighting power density (W/sq.ft.) (W/m2)

0.6 W/sq.ft. (6.46 W/m2)

0.6 W/sq.ft. (6.46 W/m2)

2009 EDITION (71 Pages)
ID: NCRetail2009_EAc1_Table3
ISBN: 978-1-932444-35-3
Authored By: Paul Best
Effective On: 27 Apr 2009