ey problems and countermeasures for airsource heat pump under whole working conditions in Beijing

Airsource heat pump (ASHP) usually faces several key problems during its practical applications, including frosting, defrosting, low temperature operation and fouling, etc. Based on the data from two practical projects in Beijing, presents the performance degradation of ASHP while facing those problems. Analyses the comprehensive performance of ASHP under whole heating and cooling seasons. Puts forward the countermeasures to improve the practical operating performance, including antifrosting, accurate defrosting control method, low temperature applicability improvement and fouling diagnostic technology, etc, in order to achieve high operation performance of the ASHP under whole working conditions in Beijing.