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• The evaporator air outlet temperature will first get closer to the air inlet temperature, which indicates the ice is blocking up the air flow path through the fins. • The evaporator temperature will drop (as expected) • The heat pump heating capacity will drop (as expected) During the defrosting period the fan, which takes air through the evaporator fins, will stop running. It can be notice that • The water pump, which circulating the water between the water tank and the outdoor unit, will stop running. • The evaporator temperature will increase until it reaches a certain value, when the defrosting stops. • After the defrosting stops, the ice layer built up on the evaporator will melt completely. • The power used for defrosting is about 1.7 kW for ten minutes. Similar pattern can be found for all the defrosting periods during the tests. Furthermore, it can also be noticed that the bottom of the evaporator is always free of ice, thanks to the special arrangement of the small gas cooler that is placed at the bottom of the evaporator for anti-frosting purpose. Moreover, the evaporator is composed of two plates of evaporator tubes and fins and it was noticed that the inner plate of evaporator has much less ice built up compared with the outer plate. This may due to the reason that warm air passing the small gas cooler at the bottom of the evaporator flows up by buoyancy forces and warms up the inner plate (Figure 24). Figure 23. Testing results of frequent defrosting (position 1) 32PDF Image | CO2 heat pumps for the Swedish market
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