Refrigerated merchandiser with modular evaporator coils and EEPR

Details Refrigerated merchandiser with modular evaporator coils and EEPR Refrigerated merchandiser with modular evaporator coils and EEPR

1996-05-29

1998-04-28

Tapolcai, William E.

Refrigeration

Processes

Defrosting or frost inhibiting

62199, 62217, 62255, A47F 304

Patent

active

057430985

ABSTRACT:
An air cooling and control system for a refrigerated food merchandiser having an insulated cabinet with a product are having adjacent product zones, plural modular evaporator coil sections of substantially equal heat exchange potential and being of predetermined length and arranged in horizontal, spaced, end-to-end predetermined disposition and separate air moving means associated with each coil section and a corresponding product zone for circulating separate air flows through the coil sections and to the product area for cooling. The system further includes a first refrigerant metering valve for controlling liquid refrigerant flow on the high side of the evaporator sections, and a second refrigerant metering valve for controlling suction pressure and refrigerant vapor flow on the low side of the evaporator sections. An electronic control senses exit air temperatures downstream of the evaporator sections and operates the second metering valve in response thereto. In another aspect, a method of operating an electronic evaporator pressure regulating (EEPR) valve during the refrigeration and defrost modes of the controlled evaporator and in response to sensed air temperatures.

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