The invention discloses a low-grade energy driving and mechanical work driving combined
heat pump or refrigerating
system. A low-grade energy collector is connected with a generator, a first condenser, a
refrigerant agent storage device, a first
throttle valve, a condensation
evaporator, an absorber, a
liquid storage device, a solution pump, a solution
heat exchanger and a generator in sequence; the high-pressure end of a compressor is connected with the solution
heat exchanger, a second condenser, the condensation
evaporator, a three-way valve, a second
throttle valve, a winter
evaporator and the low-pressure of the compressor in sequence; the three-way valve is connected with a third
throttle valve, a summer evaporator and the low-pressure end of the compressor in sequence; and the concentrated solution outlet of the generator is connected with the solution
heat exchanger and the absorber in sequence. The combined
heat pump or refrigerating
system has the advantages of all low-grade heat pumps and refrigerating systems. A compression
heat pump and the refrigerating
system are combined, and when the low-grade energy is sufficiently supplied, the COP of the system is greatly improved; when the low-grade energy is not sufficiently supplied, the system can be effectively operated; and when the low-grade energy is not supplied at all, the system can also be stably operated.