Organic Rankine cycle mixed refrigerant containing HFO-1234yf(CF3CF=CH2)

Abstract

The invention provides an organic Rankine cycle mixed refrigerant containing HFO-1234yf(CF3CF=CH2), which is applicable as a refrigerant for a low temperature organic Rankine cycle system with an evaporation temperature of 60 to 100 DEG C. The mixed refrigerant is a binary or ternary mixture consisting of the eight components of HFO-1234yf, HFE-143, HFE-134, HFC-236ea, HFC-152a, HFC-245ca, HFC-245fa and HFC-254cb in different mass proportions. A preparation method for the mixed refrigerant is to physically mix the above-mentioned components according to a designated ratio at normal temperature so as to obtain the corresponding mixed refrigerant. The mixed refrigerant provided in the invention does not destroy the ozone layer and has a low global warming potential, according with requirements for environmental protection; furthermore, the mixed refrigerant has suitable thermal parameters and excellent cycle performance. Under a design condition, Rankine cycle efficiency of the mixed refrigerant is about 9.5% and net power output per unit mass is basically above 20 kJ / kg.

Description

technical field [0001] The invention belongs to a refrigerant in a heat pump or an air-conditioning system, and in particular relates to a refrigerant in a low-temperature organic Rankine cycle system with an evaporation temperature of 60-100°C. Background technique [0002] Research on low-temperature resources (such as low-temperature geothermal energy, waste heat or solar energy) power generation technology is helpful for reducing fossil energy consumption and CO 2 , SO 2 , NO x It is of great significance to achieve sustainable development by reducing the emission of greenhouse gases and environmental pollutants. One of the main technical factors restricting the utilization of low temperature resources for power generation is the system economy. The practice of medium-temperature resource power generation technology shows that the power generation technology based on organic Rankine cycle is more economical. [0003] In recent years, with the increasing challenges br...

AI Technical Summary

Problems solved by technology

One of the main reasons why low-temperature resources are less economical for power generation and utilization is the lack of suitable circulating working fluids

C5F12, HC600, etc. are currently used as working fluids for low-temperature organic Rankine cycles. Their popularization and application are limited due to their large greenhouse effect potential (GWP) or flammability and explosion.

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