| 摘要 |
<p>An air source heat pump wherein heat is extracted from air at ambient tem perature in an evaporator (4) and heat is rejected at a higher temperature i n a condenser (2); further comprises an auxiliary heater (7) arranged to pre heat the ambient air when required to prevent deposition of frost on the eva porator. The combustion heater may be a gas fired boiler, arranged to heat r ecirculating water for supplying heating radiators and wherein the flue gase s mix with the ambient air before it passes over the evaporator.</p> |
