Two-stage compression heat pump water heater unit

Abstract

The invention relates to a hot-water unit for a twin-stage compressing heat pump, which is characterized by comprising a first compressor, an evaporator, a coupling intercooler, a first throttling device, a second compressor, a condenser, a second throttling device, a medium-temperature water pool and a high-temperature water pool, wherein a heat exchanger is arranged in the coupling intercooler; an exhaust port of the first compressor is communicated with the coupling intercooler; after the evaporator is serially connected with the first throttling device, one end of the evaporator is communicated with an air inlet of the first compressor while the other end is communicated with the coupling intercooler; an air inlet of the second compressor is communicated with the coupling intercooler; and after the condenser is serially connected with the second throttling device, one end of the condenser is communicated with an air outlet of the second compressor while the other end is communicated with the coupling intercooler. The hot-water unit can simultaneously generate medium-temperature circulating hot water at about 55 DEG C and high-temperature circulating hot water at about 80 DEG C, is high in comprehensive energy efficiency ratio, is excellent in economical efficiency and is stable in running.

Description

technical field [0001] The invention relates to a two-stage compression heat pump technology, in particular to an externally coupled two-stage compression, two-stage throttling, complete intermediate cooling and high-temperature heat pump hot water unit for generating industrial circulating hot water. Background technique [0002] Heat pump technology is a high-efficiency energy utilization technology, which is widely used in many aspects of life and production. At present, the maximum hot water temperature produced by single-stage compression heat pump hot water units developed by heat pump technology is generally below 60°C, while in industrial production, such as electroplating, clothing, food and slaughtering industries, a large number of industries need circulating hot water around 80°C , single-stage compression technology is difficult to effectively solve. Using cascade heat pump technology and two-stage compression heat pump technology can produce hot water at 80°C,...

AI Technical Summary

Problems solved by technology

At present, the maximum hot water temperature produced by single-stage compression heat pump hot water units developed by heat pump technology is generally below 60°C, while in industrial production, such as electroplating, clothing, food and slaughtering industries, a large number of industries need circulating hot water around 80°C , single-stage compression technology is difficult to effectively solve

Using cascade heat pump technology and two-stage compression heat pump technology can produce hot water at 80°C, but compared with a single-stage heat pump system that produces hot water at a temperature of about 55°C, the energy efficiency ratio of the system is relatively low, and the above-mentioned high-temperature heat pump There is a coupling problem between the high-temperature heat pump system and the low-temperature heat pump system of the unit. If the coupling between the two stages is not good, the energy efficiency ratio of the unit will be further reduced, and the operation stability of the unit will be poor

Based on the above reasons, its application in industrial production has been greatly restricted.

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