On-line self-cleaning heat exchange enhancement solar sewage source heat pump system

Disclosed is an on-line self-cleaning heat exchange enhancement solar sewage source heat pump system. A mechanical grid, a hair filter and other devices are adopted to filter dirty impurities, a control valve b, a control valve c, a control valve d and a control valve e are arranged in four sewage pipes connected with a sewage heat exchanger respectively, and the sewage pipes are back washed through switching of a control valve switch. The on-line self-cleaning heat exchange enhancement solar sewage source heat pump system fundamentally resolves the problems that when sewage serves as a cold and heat source and is used, the dirty impurities block the pipes, the hair blocks the heat exchanger, the size of the heat exchanger is large due to dirt, the performance of the heat exchanger is reduced due to turbid water, and the heat exchanger breaks down. A solar device is installed at a water inlet of a water source heat pump, the temperature of inlet water is improved, the problem that the system can not be started normally due to the too low temperature of inlet water in winter is resolved, the heat exchange performance of the system is largely improved, it is ensured that the system is safe, reliable and stable, sewage or surface water can serve as a low-position cold and heat source, the heat pump technology is used for cooling and heating, or used for cooling industrial equipment, and the system is efficient and environment-friendly.