Air treatment evaporator temp. control - is effected by refrigerant inlet valve controlled from temp. probes

摘要

Temperature probes provide modulating signals for control of a thermostatic relief valve. The system is for use in an evaporator in which the refrigerating liquid is evaporated at high temperature. Such an evaporator is used for treatment of air for drying cereals. A thermostatic valve (1) is connected into the inlet pipe (31) of an evaporator (3). The valve controls the supply of refrigerating fluid from a high pressure circuit (4) comprising a supply bottle (41). Temperature probes (22, 21) at the input (31) and output (32) of the evaporator measure temperatures (T1, T2) to enable a control unit (2) to operate a servo-motor (11) on the valve to maintain a predetermined temperature difference.