Screw-coupled centrifugal water vapor energy heat pump system for ultra-low-temperature environment heating

Abstract

The invention discloses a screw-coupled centrifugal water vapor energy heat pump system for ultra-low-temperature environment heating and relates to the technical field of energy conservation and energy utilization, and is composed of a screw type heat pump main machine, a centrifugal heat pump main machine, a water vapor energy purification platform and a user system. The screw heat pump main machine, the centrifugal heat pump main machine and the water vapor energy purification platform are used as a cold source and a heat source of an air conditioning system, heat can be stably supplied inultra-low-temperature environment (minus 20 DEG C), the system energy efficiency is improved, the system energy consumption is reduced, defects of the cold source and the heat source of the air conditioning system are overcome, the heat pump system is more energy-saving, and the air conditioning system application area and time are greatly expanded. The heat pump system is simple in structure andconvenient to operate, construction, mounting and later maintenance are easy, and initial investment and operating cost are reduced.

Description

technical field [0001] The invention relates to a screw-coupled centrifugal water vapor energy heat pump system for heating in an ultra-low temperature environment, which involves two major fields of air conditioning technology application and energy saving in my country. Background technique [0002] Among the cold and heat sources of the current heat pump air-conditioning system in our country, there are mainly types such as single cooler + boiler, various types of heat pumps, and absorption units. Each type of cold and heat source has its own advantages and disadvantages. The cold and heat source of the single cooler + boiler type requires two sets of systems, in which the single cooler and the cooling tower work together to supply the chilled water required by the air conditioner in summer, and the boiler burns to supply the hot water for the air conditioner in winter, resulting in a high rate of equipment replacement. The economy of the system is poor, and boiler combus...

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Problems solved by technology

In the application process, since most of them use screw compressors as the compressors of the heat pump main engine for heating and cooling, it appears that the cooling capacity in summer is sufficient, but the heating capacity in winter is small, and the heating capacity in winter is insufficient. In the case of exceeding the cooling capacity in summer, at the same time, due to the poor stepless adjustment ability of the screw compressor during use, the heating and cooling capacity cannot be adjusted in a wide range, which leads to deviations in the selection of the unit. Under the low evaporation pressure, part of the refrigerant liquid enters the compressor, and there is a phenomenon of liquid shock in the compressor. The compressor has a large safety hazard. At the same time, due to the low temperature working condition, the lubricating ability of the lubricating oil decreases and the viscosity increases. , which further leads to a decline in the heating capacity of the main engine, and due to the low liquid inlet temperature, the evaporation temperature of the refrigerant decreases, and the working state of the screw compressor is unstable. At a lower outdoor temperature, the temperature of the air-conditioning hot water that the screw compressor can provide is lower. Or in order to maintain a higher temperature hot water, the heating capacity is reduced, etc., and the centrifugal heat pump host is difficult to work under low temperature conditions. Heat sources have their limitations, so they need to be improved

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