Working principles:
The screw type water source heat pump air conditioning units applies  the world advanced heat exchange equipments,taking the water as the carrier,and  uses the low-grade energy like ground water, the river water, the lake water, the sea water even waste water. The sewage heat sink, undergoes the steam compression type refrigeration cycle. Cooled in the summer use underground low temperature water source, has omitted the pollution which created because of the cooling tower, enhanced the unit performance. Enables the people  to be far away from traditional  boiler heating, and achieves the highly effective energy conservation .The water source heat pump  is a new product which simpler than  the ordinary refrigeration cycle and applies advanced energy conservation, the environmental protection idea unifies, manifests the high tech environmental protection. 6.Multi-unctions,both heating and cooling ,also can provides hot water for daily use.