Environment-friendly medium-high temperature heat pump working medium containing dimethyl ether and iodotrifluoromethane

Abstract

The invention relates to an environment-friendly mixing working medium suitable for compression type medium-high temperature heat pump unit. The working medium comprises three components in percentage by weight as follows: 25%-75% of DME (dimethyl ether), 15%-45% of R13I1 (iodotrifluoromethane) and 10%-50% of R152a (difluoroethane). A preparation method comprises the step that the components are subjected to fluent physical mixing at the normal temperature in a designated proportion. The working medium has the advantages that the ODP (ozone depletion potential) of the working medium is zero, the GWP (global warming potential) is very low, and the mixing working medium is environment-friendly; the cycle performance is excellent, the performance of the medium-high temperature variable working condition is better, and the slippage temperature is very low; and the working medium can be directly used in the R134a heat pump unit, so that the compressor and main parts in the system are not required to be changed. The heat pump unit employing the mixing working medium can provide a medium-high temperature heat source in a range from 70 DEG C to 90 DEG C.

Description

technical field [0001] The present invention designs a working medium used in a medium-high temperature heat pump unit, especially relates to a medium-high temperature heat pump system with a condensation temperature of 70-100°C that does not destroy the ozone layer at all (that is, the ozone destruction potential ODP=0) and a greenhouse Environmentally friendly mixed working fluid with small effect potential GWP value. Background technique [0002] A heat pump is a device that uses energy to make heat flow from a low-level heat source to a high-level heat source. High-grade thermal energy resources adopt the reverse Carnot cycle principle to transfer low-level heat energy to high-level heat energy through a small amount of electric energy consumption, so as to achieve the purpose of heating or cooling. Heat pump technology is a very promising energy-saving technology with high efficiency, energy saving, stable operation, remarkable environmental benefits, and effective use...

AI Technical Summary

Problems solved by technology

[0004] So far, the developed commercial heat pump refrigerants with zero ozone depletion potential include HFC refrigerants such as R407c, R410a and R134a (1,1,1,2-tetrafluoroethane), but they all have high The potential of the greenhouse effect, and inevitably there are defects in thermal engineering and cycle performance. For example, R407c has a large temperature glide, and the temperature of hot water provided by the air-conditioning-heat pump system of R407c and R410a is only 50 -60°C (no matter how high the temperature is, it will lead to a decrease in cycle efficiency and increase unsafe factors), etc.

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