Heat Recovery Technology of Heater Air Conditioner

Heat recovery technology in heater air conditioner field is mature and advanced technology of energy saving and environmental protection, can maximize the recovery of waste heat, electricity saving unit, to provide free living hot water; directly reduced to atmospheric heat emissions, especially for the southern region has good economy. At present domestic and international production and sales of water source heat pump unit is just for dry system and full liquid type system. Dry system energy efficiency ratio is relatively low, and the full liquid type system in the presence of liquid level control of heater air conditioner is difficult and the oil return difficult defects. Falling film type system integrated dry and full liquid type system, not only realizes the efficient, especially application of a new differential pressure oil return mode is more stable, reliable. Falling film type total heat recovery of water source heat pump technology using falling film evaporator to achieve efficient operation, compared with full liquid type unit only needs less quantity of refrigerant, the smaller environmental impact; using dual beam shell and tube condenser for cooling and condensation heat recovery utilization, in order to provide hot water for life. But the traditional approach is to use a dual heat exchanger series parallel work, or in the engineering system. Double heat exchanger system control complexity, poor reliability; engineering system implemented by the recovery of the hot taste. This project adopts double tube bundle heat exchanger for heat recovery was overcome above disadvantages.

The Ductless Mini-split Heat Pumps
Using dual beam shell and tube condenser cooling water and ensure recovery hot water running independently, free switch and the cross contamination, the perfect realization of total heat recovery function. Using falling-film evaporator and improve unit operation efficiency, improve the maintenance performance. Improve the refrigeration coefficient of performance (EER); improved evaporator heat transfer performance, reduce the material cost; falling film evaporator ductless mini-split heat pumps transfer temperature difference is small, may be appropriate to increase water temperature, thus reducing the use of groundwater flow and water pump power. Repairing convenience: chilled water flows in a pipe, through the open end cap, clean water side fouling; the refrigerant charging quantity is small, more in line with the requirements of environmental protection.

Intermittent Pressure Oil Return Program
Using intermittent pressure oil return program is simple, reliable operation. A new differential pressure oil return scheme: oil, high pressure solenoid valve is closed, the pressure balance valve open, oil from the evaporator through a one-way valve to flow to the oil collector. Oil return electromagnetic valve is closed, the pressure balance, high pressure solenoid valve to open, high pressure oil return to the compressor. Through the time relay to control the action of the electromagnetic valve can realize intermittent oil returning.

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