Mixed refrigerant applicable to large-circulation temperature rise for medium-high temperature heat pump

Abstract

The invention discloses a mixed refrigerant applicable to large-circulation temperature rise for a medium-high temperature heat pump. The mixed refrigerant comprises, by mass, 1-10% of HC1270, 2-96% of HFC134a and 3-97% of HCFC 142b. The refrigerant suitably serves as a refrigerant for a medium-high temperature heat pump system with circular temperature rise (temperature difference between evaporation and condensation) of 60-80 DEG C and the condensation temperature of 70-100 DEG C. The refrigerant is low in ozone depletion potential and greenhouse effect potential so as to meet environmental protection requirements, and is appropriate in thermal parameters and excellent in cycling performance, an HFC134a air condition compressor can be used for optimized design of a medium-high temperature heat pump unit in large-circulation temperature rise of the novel refrigerant, and the novel refrigerant can be directly applied to an original HFC134a air conditioning unit to convert the original air conditioning unit into the medium-high temperature heat pump unit in large-circulation temperature rise of the novel refrigerant. The unit can directly use normal-temperature water sources and ground sources at the temperature of about 10-40 DEG C and can provide hot water at the temperature of about 70-100 DEG C for users.

Description

technical field [0001] The invention relates to a medium-high temperature heat pump mixed working medium, in particular to a medium-high temperature heat pump mixed working medium suitable for large cycle temperature rise. Background technique [0002] At the expense of consuming a part of high-grade energy (such as electric energy), heat pump technology converts low-grade heat energy that cannot be directly used (heat energy contained in air, soil, surface water or shallow groundwater, as well as geothermal energy, solar energy, and industrial energy) through thermal cycles. waste heat, etc.) to a level that can be used; the energy efficiency ratio (or coefficient of performance - COP) of the system is generally higher than 3. As long as COP>1 / η (take conventional thermal power generation as an example, η is the total efficiency of power generation and transmission and distribution), the application of heat pump heating technology can save primary energy, reduce environm...

AI Technical Summary

Problems solved by technology

At present, the air conditioner-heat pump system is widely used, and the working medium used is mainly HCFC22 or its substitutes R407C, R410A, etc. The system can provide a cycle temperature rise within 50°C, and the maximum temperature of hot water is 50~55°C (no matter how high it will be) Not only the cycle performance deteriorates, but also accidents will be caused by breaking the upper limit of the pressure and exhaust temperature of the system), unable to provide heat energy at a higher temperature level