Low temp air source heat pump

TL;DR: In this article, the authors proposed a utility model for low temperature air source heat pump, which can generate heat normally even under low temperature outdoor environment conditions, and is provided with better economical and applicable effects.

Abstract: The utility model provides a low temperature air source heat pump, which can generate heat normally even under low temperature outdoor environment conditions, and is provided with better economical and applicable effects. The heat pump is provided with a high temperature system and a low temperature system. In a low temperature environment (around-30~-2 Celsius system), the two systems operate recursively: an evaporator (22)of the low temperature system absorbs the heat from the low temperature environment; refrigerants sends the heat to a condenser (17)of the low temperature system; the heat is transmitted from the condenser (17)of the low temperature system to an evaporator (14)of the high temperature system; and refrigerants in the high temperature system sends the heat to an heat exchanger (10)of the high temperature system. When the environment temperature is high, the high temperature system operates and the refrigeration and heat generation functions for common heat pumps can still be maintained. Double-system heat generation and single-system heat generation can be controlled to switch automatically through a solenoid valve according to the environment temperatures. The single-system refrigeration and heat generation can be switched by a four-way valve in a conventional way.