Mixed working medium of high temperature heat pump in utilization of terrestrial heat of coal mine
A high-temperature heat pump and mixed working medium technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as high GWP value, ozone layer destruction, flammability and practical application difficulties, and achieve good environmental performance and thermal performance Good results
Inactive Publication Date: 2015-09-23
XIAN UNIV OF SCI & TECH
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Problems solved by technology
On the one hand, it is limited because of its ozone layer destruction and high GWP value; on the other hand, it cannot provide higher temperature heat energy for use in life and production
In recent years, HFCs substances have also been used as medium and high temperature heat pump cycle working fluids. However, some substances have certain difficulties in practical application due to their flammability, such as R161, R152a and R32
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0077] Example 1: In terms of mass percentage, 75% of HFO-1366mzz(Z) and 25% of HFC-134a were mixed physically at room temperature as heat pump cycle working fluid.
Embodiment 2
[0078] Example 2: In terms of mass percentage, 80% of HFO-1366mzz(Z) and 20% of HFC-134a were used as heat pump cycle working fluid after physical mixing at normal temperature.
Embodiment 3
[0079] Example 3: In terms of mass percentage, 85% of HFO-1366mzz(Z) and 15% of HFC-134a were physically mixed at room temperature and used as heat pump cycle working fluid.
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The invention discloses a mixed working medium of a high temperature heat pump in the utilization of the terrestrial heat of a coal mine. The mixed working medium comprises one or two kinds of HFO-1336mzz(Z), HFC-134a, HFC-236ea, HFE-245fa2, HFC-227ea, HFC-245fa and HFE-7000. The mixed working medium disclosed by the invention is nonflammable, the ODP is equal to zero, an ozone layer is not destroyed, the GWP is lower, and the mixed working medium conforms to environmental protection performance requirements; under the designed working conditions, the heating performance coefficient is about 5.54, the heating load of a unit volume is about 1500kJ / m3, and the thermal working performance is better.
Description
technical field [0001] The invention relates to the technical field of working medium of a thermodynamic cycle system, in particular to a mixed working medium of a medium-high temperature heat pump for geothermal utilization in coal mines. Background technique [0002] At the cost of consuming a small amount of electric energy, heat pump technology transfers low-temperature and low-grade heat energy (industrial wastewater, geothermal water, soil, solar energy, atmosphere, etc.) The waste heat resources that are difficult to use can provide the thermal energy required by industry with high efficiency. In order to meet the requirements of industrial development for higher heating temperature, heat pump technology is developing in the direction of medium and high temperature heat pumps and high temperature heat pumps. While improving the utilization rate of waste heat resources, medium and high temperature heat pumps reduce the discharge temperature of waste heat and reduce en...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C09K5/04
CPCC09K5/04C09K5/045C09K2205/112C09K2205/122C09K2205/126
Inventor 张京兆
Owner XIAN UNIV OF SCI & TECH
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