초록 ▼

A low temperature refrigerant gas heater system for warming structural parts of refrigerated display cabinets sufficiently to prevent the formation of moisture condensate. A desuperheating means is provided for an auxiliary gas flow line taken off from a primary refrigeration circuit in order to low

A low temperature refrigerant gas heater system for warming structural parts of refrigerated display cabinets sufficiently to prevent the formation of moisture condensate. A desuperheating means is provided for an auxiliary gas flow line taken off from a primary refrigeration circuit in order to lower the temperature of a portion of the refrigerant gas flow to within the range of about 80°F. to 130°F. for this purpose. The auxiliary gas have pressure-temperature-enthalpy conditions located in the superheated region or the saturation envelope area of a pressure-enthalpy diagram within these temperature limits. The use of low temperature refrigerant gas in the auxiliary flow line avoids heater line warping and buckling and customer inconvenience and discomfort problems which are incurred by use of high temperature compressor refrigerant gas.

대표청구항 ▼

A display cabinet refrigeration and heater system comprising: refrigeration means associated with a portion of the structure of said cabinet and including an expansion valve and evaporation coils; said refrigeration means serially connected within a refrigeration circuit; said circuit containing a c

A display cabinet refrigeration and heater system comprising: refrigeration means associated with a portion of the structure of said cabinet and including an expansion valve and evaporation coils; said refrigeration means serially connected within a refrigeration circuit; said circuit containing a compressor for enabling refrigerant flow and energy input and a condenser located at a remote position from said cabinet; a refrigerant gas heater system having an auxiliary refrigerant gas flow line located in heat exchange contact with a cooled portion of said cabinet structure; said auxiliary gas flow line connected by a first portion thereof to said refrigeration circuit at a refrigerant gas sourcing point downstream from said compressor and at an upstream position from said condenser; a desuperheating means connected to said first portion of said flow line for lowering the temperature of said gas; an inlet end of said gas flow line containing desuperheated refrigerant gas at a temperature within the range of about 80°F. to 130°F. and a pressure at least equivalent to the equilibrium saturated vapor pressure at 50°F., said gas flow line providing heat for the contacted portion of said cabinet structure by transfer of sensible heat and the latent heat of condensation thereof, and said auxiliary gas flow line connected by the outlet end thereof to said refrigerant circuit at a position downstream from said gas sourcing point.