Transport refrigeration system with improved temperature and hum

Details Transport refrigeration system with improved temperature and hum Transport refrigeration system with improved temperature and hum

1989-01-03

1990-02-13

Wayner, William E.

Refrigeration

Automatic control

Selective heating or cooling

62217, 236 75, F25B 1300

Patent

active

048995495

ABSTRACT:
A transport refrigeration system operable in cooling and heating cycles to maintain the temperature of a fresh load in a conditioned space extremely close to a predetermined set point temperature, with the cooling cycle primarily controlling the load temperature in ambients above freezing. The transport refrigeration system includes a compressor driven by a prime mover in one of two selectable speeds, an air delivery system which provides a substantially constant volume of conditioned air for a conditioned load space regardless of prime mover speed, a modulation valve in a suction line of the compressor, and a digital thermostat which senses the temperature of air returning to an evaporator. The digital thermostat controls the modulation valve via modulation control in a predetermined temperature range above and below set point, in both the heating and cooling cycles.

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