Semi-open high-temperature heat pump system and working method thereof

Abstract

The invention provides a semi-open high-temperature heat pump system. The system comprises a compressor, a contact condenser, a heat exchanger, an evaporator, a water purifier, a cold water pump, a hot water pump, a circulating water pump and a vacuum pump. An exhaust port of the compressor is connected with the contact condenser, the contact condenser is connected with the evaporator through theheat exchanger, the evaporator is connected with the compressor air suction port through an upper exhaust port, an outlet of the water purifier is correspondingly connected with the compressor, the contact condenser and the evaporator through the cold water pump, a lower outlet of the evaporator is connected with the contact condenser through the circulating water pump, the upper part of the contact condenser is connected with the vacuum pump, and the lower part of the contact condenser is connected with the hot water pump. According to the system, water is adopted as a circulating working medium, and the contact condenser with high heat transfer efficiency is adopted, so that the system has the characteristics of being environment-friendly and high in efficiency, can recover low-temperature waste heat of 50 DEG C or above, and provides high-temperature hot water of 90 DEG C or above. Compared with the prior art, the system effectively reduces the heat transfer thermal resistance, improves the heat transfer efficiency, effectively recovers the low-temperature waste heat, improves the heat source quality, and achieves reuse.

Description

Technical field [0001] The invention relates to a semi-open high-temperature heat pump system, which belongs to the technical field of energy utilization and recovery. Background technique [0002] Since the 21st century, my country has paid more attention to reducing environmental pollution and energy waste in industrial production. Relevant data shows that my country’s total industrial waste heat resources account for 17% to 67% of total consumption. At the same time, my country’s waste heat recovery rate is less than 30%. %, which is significantly lower than the recovery rate of waste heat in developed countries, causing huge energy waste every year. Therefore, it is very necessary for my country to fully develop the waste heat recovery field at this stage and reduce energy waste. [0003] The heat pump is a high-efficiency energy-saving device that fully recycles low-grade heat energy. However, the current heat pump system mainly using HCFCs as the circulating working fluid ha...

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Problems solved by technology

However, water as a circulating working medium also has problems such as large volume flow rate and high exhaust temperature of the compressor, and when a closed cycle is used, in order to ensure the quality of circulating water, neither the evaporator nor the condenser can use a contact heat exchanger, which will undoubtedly cause problems. Increase the heat transfer resistance and reduce the circulation efficiency of the system. At the same time, the heat pump system using water as the circulating working medium has technical problems such as freezing of the circulating working medium when it is not in operation in winter

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