Heat Pump Heating Systems Combined with Solar Energy and Lake Water Source for the Biogas Digester

摘要

A heating system combined with solar energy and lake water source heat pump was designed for 200 m~3 fermentation reactor. In it could be switched to solar energy power mode, solar power with lake water source heat pump mode and lake water source heat pump mode according to different conditions. Compared with coal fired boiler, initial investment is a little higher, but for annual operating cost, this heating system is only 50% of coal fired boiler's. But in the next several years, the initial investment can be returned back. For energy saving and economic, it is a suitable heat source for the biogas engineering in suitable area.