Refrigerated merchandiser with modular evaporator coils and electronic evaporator pressure regulator control

There is disclosed a method of controlling exit air temperature from an evaporator coil (22) in a commercial refrigerated merchandiser (M) for food products, in which the evaporator coil has a refrigeration mode and a defrost mode and the suction side of the evaporator coil has an electronic evapora...

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Bibliographic Details
Main Author BEHR, JOHN A
Format Patent
LanguageEnglish
French
German
Published 30.06.2004
Edition7
Subjects
BLASTING
COFFEE MILLS
COLD ROOMS
COMBINED HEATING AND REFRIGERATION SYSTEMS
COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS
DOMESTIC ARTICLES OR APPLIANCES
FURNITURE
HEAT PUMP SYSTEMS
HEATING
HUMAN NECESSITIES
ICE-BOXES
LIGHTING
LIQUEFACTION SOLIDIFICATION OF GASES
MANUFACTURE OR STORAGE OF ICE
MECHANICAL ENGINEERING
PAYING COUNTERS
REFRIGERATION MACHINES, PLANTS OR SYSTEMS
REFRIGERATION OR COOLING
REFRIGERATORS
SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS,STOREHOUSES, BARS, RESTAURANTS OR THE LIKE
SPICE MILLS
SUCTION CLEANERS IN GENERAL
WEAPONS
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Summary:There is disclosed a method of controlling exit air temperature from an evaporator coil (22) in a commercial refrigerated merchandiser (M) for food products, in which the evaporator coil has a refrigeration mode and a defrost mode and the suction side of the evaporator coil has an electronic evaporator pressure regulator (EEPR) valve (24) operated by a valve controller circuit (25), said control method being characterized by the steps of: (a) sensing the exit air temperature from the evaporator coil and generating a signal corresponding thereto; (b) operating the EEPR valve in the refrigeration mode of the evaporator coil by modulating refrigerant vapor flow therethrough to maintain a preselected exit air temperature; (c) operating the EEPR valve in the defrost mode of the evaporator coil, (1) by first closing the EEPR valve during a preselected de-icing period of said evaporator coil until reaching a predetermined drip temperature, and (2) then activating the valve controller circuit in response to detection of exit air temperatures exceeding a preselected value during a final drip period to provide limited refrigeration to maintain the preselected temperature during the remainder of the defrost mode.
Bibliography:Application Number: EP20040000011