THE USE OF WARM OUTFLOW VENTILATION AIR FOR INCREASE AN OPEN AIR HEAT PUMP EFFICIENCY

In the paper two years (2012-2013) experience on the use of renewable energy resources in production conditions of technological processes in agriculture is analyzed. There an outside air heat pump with passive evaporators was investigated. The recovered heat energy for new borne piglets resting place floor panels heating was used. At low outside air temperature in autumn and winter months the evaporator of the heat pump becomes covered by hoarfrost and ice, which lower the heat pump's efficiency. It can be avoided directing the warm pigsty air delivered out by the ventilation system on the heat pump evaporators. The investigation results show that directing the warm inside air on one of two evaporators, already ensure normal heat pump work during all winter period, even at outside air temperature -20 degrees C. The fall in hot air temperature after the washing of first evaporator does not exceed 10 degrees C, indicating that some air flow can be directed for the second evaporator's heating too.