Steam compression heat pump using water as working medium

Abstract

A heat pump of steam compression type in using water as working media is featured as using water as working media, applying impeller compressor, adding interstage heat taker between various stages of compressors to realize combination of staging compression and interstage heat-take for taking away heat built up by residual heat fluid and compression power consumption of heated fluid at said heat taker and condenser separately, adding heat regenerative unit to be used on superheat of low pressure steam for improving compression course.

Description

technical field [0001] The invention belongs to the technical field of low-temperature waste heat utilization and refrigeration. Background technique [0002] The use of heat pump technology for waste heat utilization is an effective means, which has relatively good energy saving, environmental protection and economic benefits; in terms of waste heat utilization, the temperature of many waste heat is also above 0 ℃, and the heating temperature requirement is higher. In such a field, appropriate working fluid and corresponding devices can be considered. [0003] Among the heat pumps used, the vapor compression heat pump is a relatively common device, which generally consists of a compressor, a condenser, a throttle valve and an evaporator, etc., and the working medium completes the heat pump cycle inside the device. The current one-stage vapor compression heat pump has the following problems: ① Most of the working fluids used are chemical compounds, which have many shortcomi...

AI Technical Summary

Problems solved by technology

The current one-stage vapor compression heat pump has the following problems: ① Most of the working fluids used are compounds, which have many shortcomings in terms of price, safety, environmental protection, and thermal performance.

② The performance index is low, and the energy-saving benefit is affected; especially as a heat pump, when the heating temperature is high, the performance index drops significantly and is low

③Restricted by the safety of lubricating oil, as a heat pump, its heating temperature is relatively low (compared with absorption heat pumps), and its application range is limited; ④The heat load of a single unit is relatively low

⑤ High equipment cost and working medium price

The reasons for the above problems are: ① Generally, the vapor compression process is not adiabatically compressed, and the work consumed by the compressor is the largest, so the performance index of the heat pump is naturally relatively low, and with the increase of the compression ratio, the performance index of the heat pump drops rapidly

②Using compounds as working fluids, compared to naturally occurring high-quality and cheap water, their comprehensive performance is generally not good enough

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