| 摘要 |
FIELD: heating systems. ^ SUBSTANCE: cooling unit includes heat-insulated housing (1) enveloping cooling chamber (2), evaporator (7) installed in air channel (4, 5) interconnected with cooling chamber (2), heating device (8) for heating evaporator (7) and control diagram (10) to control operation of heating device (8). Control diagram (10) is connected to signal transmitting measuring device installed in air channel (4, 5) and characterising air flow passing through channel (4, 5), and is provided with possibility of switching on heater (8) when measured air flow decreases below some limit value. Measuring device has two temperature sensors installed in various proximity as to heat to heat source or to heat flux sink, or to air in channel (4, 5). Control diagram (10) has the possibility of determining air flow decreased below limit flow value when difference of temperatures measured with two sensors is beyond limit temperature difference value. ^ EFFECT: simplifying and improving cooling unit reliability. ^ 5 cl, 5 dwg |
