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Middle-high temperature heat pump mixing working substance containing trifluoroiodomethane (R13I1) and tetrafluoromethane (HFCl34a)

A technology of trifluoroiodomethane and tetrafluoroethane, which is applied in the field of refrigerants, can solve the problems of easy accidents, inability to provide heat energy, and deterioration of cycle performance, so as to reduce the greenhouse effect, excellent environmental characteristics, and excellent cycle performance. Effect

Inactive Publication Date: 2007-09-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used air-conditioning-heat pump systems use HCFC22 or its substitutes R407C, R410A, etc. as the working fluid. The upper limit of pressure and discharge temperature of the system is easy to cause accidents), and cannot provide heat energy at a higher temperature level

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] take 35 mass % R13I1, 27 mass % HFC134a, 38 mass % HFC245fa, used as a refrigerant after physical mixing at room temperature.

[0013] The design conditions of the heat pump system are taken as follows: the average evaporation temperature is 40°C, the average condensation temperature is 85°C, and the suction superheat is 2°C (for some working fluids, an appropriate exhaust superheat is taken to avoid wet compression), The degree of supercooling is 5°C. Taking non-piston (such as screw, scroll, etc.) compressors as an example, the thermal efficiency of the compressor is 0.9, and the motor efficiency, mechanical efficiency and constant entropy efficiency of the compression process are all 0.85.

Embodiment 2

[0015] Take 38 mass % R13I1, 13 mass % HFC134a, 49 mass % HFC245fa, used as a refrigerant after physical mixing at room temperature.

[0016] The design conditions of the heat pump system are taken as follows: the average evaporation temperature is 50°C, the average condensation temperature is 95°C, and the suction superheat is 2°C (for some working fluids, an appropriate exhaust superheat is taken to avoid wet compression), The degree of subcooling is 0°C. Taking the hermetic piston compressor as an example, the thermal efficiency of the compressor is taken as 0.9, the motor efficiency, mechanical efficiency and constant entropy efficiency of the compression process are all taken as 0.85, and the clearance volume coefficient is taken as 0.03.

Embodiment 3

[0018] Take 36 mass %R13I1,3 mass % HFC134a, 61 mass % HFC245fa, used as a refrigerant after physical mixing at room temperature.

[0019] The design conditions of the heat pump system are taken as follows: the average evaporation temperature is 60°C, the average condensation temperature is 105°C, and the suction superheat is 2°C (for some working fluids, an appropriate exhaust superheat is taken to avoid wet compression), The degree of subcooling is 0°C. Taking the hermetic piston compressor as an example, the thermal efficiency of the compressor is taken as 0.9, the motor efficiency, mechanical efficiency and constant entropy efficiency of the compression process are all taken as 0.85, and the clearance volume coefficient is taken as 0.03.

[0020] According to the cycle calculation, the relevant parameters and cycle performance indexes of the above three embodiments are shown in Table 2.

[0021] Parameters and performance

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Abstract

The invention relates to a kind of middle / high temperature heat pump refrigerant mixture containing trifluoroiodomethane (R13I1) and tetrafluoroethylene (HFC134a), which is suitable for using as the refrigerants for middle / high temperature heat pump system with a temperature of 60~120deg.C. The material is composed of 35-95% of R13I1, 0-55% of HFC134a and 5-65% of HFC245fa by weight share. The preparation method is that it physically mixes the above materials according to the designated ratio. The invention does not destroy the ozone layer, and the greenhouse effect is weak.

Description

technical field [0001] The invention belongs to refrigerants in heat pumps or refrigeration and air-conditioning systems, and particularly relates to refrigerants used as refrigerants in medium-high temperature heat pump systems with a condensation temperature of 60-120°C. Background technique [0002] For the energy-consuming links that exist in large numbers in production and life and require relatively low thermal energy grades (temperature is 60-160°C), the use of heat pump heating technology not only has a higher total energy utilization efficiency than conventional energy supply methods, but also reduces CO 2 emissions (thereby reducing the greenhouse effect), and can also effectively utilize industrial waste heat, geothermal energy, solar energy, and low-grade heat energy contained in the environment (air, soil, surface water or shallow groundwater) to reduce heat pollution caused by waste heat discharge. At present, heat pump technology is...

Claims

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Application Information

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IPC IPC(8): C09K5/00
Inventor 王怀信马利敏郑臣明张宇杨强
Owner TIANJIN UNIV
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