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Supermarket Refrigeration Prescriptive Measures and Baseline for Energy Cost Budget (EAc1)

Item

Attribute

Prescriptive Measures

Baseline

Evaporator

Evaporator fan speed control

Variable speed evaporator fan

Constant volume, constant operation

Evaporator design approach temperature

10°F (-12.2°C)

10°F (-12.2°C)

Condenser

Air cooled condenser fan speed control

Variable Speed Condenser Fan (electronically commutated motors if single phase and less than 1 hp)

Cycling one speed fan

Air cooled condenser design approach

Floating head pressure, min of 70°F (21.1°C), 5°F (-15°C) drybulb offset

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

Air cooled condenser fan power

80 Btu/Watt-hr at 10°F (-12.2°C) approach temperature

53 Btu/Watt-hr at 10°F (-12.2°C) approach temperature

Evaporative condenser fan speed control

Variable speed condenser fan (electronically commutated motors if single phase and less than 1 hp)

Cycling one speed fan

Evaporative condenser design approach temperature

Floating head pressure, min of 70°F (21.1°C), 9°F (-12.8°C) wetbulb offset

18°F to 25°F (-7.8°C to -3.9°C) based on design wetbulb temperature

Evaporative condenser fan and pump power

400 Btu/Watt-hr at 100°F (37.8°C) saturated condensing temperature and 70°F (21.1°C) wetbulb temperature

330 Btu/Watt-hr at 100°F (37.8°C) saturated condensing temperature and 70°F (21.1°C) wetbulb temperature

Refrigeration System

Suction pressure control

Not addressed

Not addressed

Condensing temperature control

85°F (29.4°C) minimum condensing temperature, fixed setpoint

85°F (29.4°C) minimum condensing temperature, fixed setpoint

Defrost control

No electrical defrost. Hot gas defrost only

Not addressed

Compressor

Compressor capacity modulation

Variable speed drive trim compressor

Slide valves on screw compressors, multiple compressor racks on reciprocating compressor plants

2009 EDITION (70 Pages)
ID: NCRetail2009_EAc1_Table2
ISBN: 978-1-932444-35-3
Authored By: Paul Best
Effective On: 27 Apr 2009