CN107603568A - Environment-friendly non-azeotropic mixed refrigerant suitable for high-temperature heat pump - Google Patents

Abstract

The invention discloses an environment-friendly non-azeotropic mixed refrigerant suitable for a high-temperature heat pump, which can ensure that the temperature of the outlet water of a condenser of the high-temperature heat pump reaches more than 70-110 ℃; the using method comprises the following steps: physically mixing the components according to the specified mass ratio at normal temperature, and directly filling the mixture into a heat pump unit to form the high-temperature heat pump unit. The invention has the advantages that: the mixed refrigerant can be directly filled in a common HFC-134a heat pump unit, the lubricating oil of the unit does not need to be replaced, the original heat pump unit is converted into a high-temperature heat pump unit, and hot water with the temperature of more than 70-110 ℃ can be generated; the safety and stability are good; the high-temperature working condition has good cycle performance.

Description

An environmentally friendly non-azeotropic mixed refrigerant suitable for high temperature heat pumps

technical field

The invention relates to an environment-friendly non-azeotropic mixed refrigerant suitable for high-temperature heat pumps, especially when the outlet water temperature range of the high-temperature heat pump condenser is in the range of 70-110°C.

Background technique

There are a large number of waste heat resources at 30°C to 60°C in industrial production, which are often discharged directly, resulting in energy waste and environmental pollution. As an important means of energy recovery, heat pumps can convert low-level energy in low-temperature heat sources into high-level energy, which can be directly used in industrial production with higher requirements. On the one hand, it improves energy utilization, and on the other hand, it greatly reduces Energy waste and environmental pollution. At present, room temperature heat pumps with a condensing temperature lower than 60 °C have been widely used in the domestic market, but there has been no breakthrough in the research of medium and high temperature heat pumps that pursue higher outlet water temperatures (up to 100 °C and above). The key reason is the lack of an environmentally friendly, safe and stable refrigerant with excellent cycle performance. In the past, refrigerants used in high-temperature heat pumps, such as CFC113, CFC114, and CFC11, had large ODP values and GWP values, which intensified the greenhouse effect while destroying the ozone layer, and have been banned worldwide. HFC134a, HCFC22, etc. Under high temperature conditions, it has too high condensing pressure and compressor discharge temperature and cannot be used normally. At the same time, new refrigerants that are environmentally friendly, safe and stable, excellent in cycle performance, and suitable for high-temperature working conditions are key issues to be solved in high-temperature heat pump technology.

Contents of the invention

The object of the present invention is to provide an environment-friendly non-azeotropic mixed refrigerant suitable for high-temperature heat pumps in view of the defects and deficiencies of the prior art.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An environmentally friendly non-azeotropic mixed refrigerant suitable for high-temperature heat pumps. The specific method is: physically mix the two components of HFC-134a and HFC-245fa according to the specified mass ratio at room temperature, and can be directly charged into The heat pump unit becomes a high-temperature heat pump unit, which produces hot water at about 70-110°C.

Further, the HFC-134a accounts for 0-60%, and the HFC-245fa accounts for 40-100%.

After adopting said structure, the beneficial effects of the present invention are:

(1) High outlet water temperature: The mixed refrigerant of the present invention can be directly charged into a common HFC-134a heat pump unit without changing the lubricating oil of the unit, and can generate hot water above 70-110°C.

(2) Good safety and stability: the two components in the present invention will not react with each other, and can be combined with materials including copper, steel, refrigeration oil, gaskets, motor insulation layers, rubber, plastics, etc. Long-term contact without any reaction ensures its safe and stable operation.

(3) Good cycle performance under high temperature conditions: under the conditions of evaporation temperature of 50°C and condensation temperature of 100°C, the heating COP is greater than 3.59, and the heating capacity per unit volume is greater than 3143.2kj/m according to different component ratios. ^3. The heating capacity per unit mass is greater than 123.26kj/kg, and the cycle performance is good.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

Example 1: Take 40 ^mass % HFC-245fa and 60 ^mass % HFC-134a, mix them physically at room temperature, and use them as refrigerants to directly fill the HFC-134a heat pump unit.

Example 2: Take 50 ^mass % HFC-245fa and 50 ^mass % HFC-134a, mix them physically at room temperature, and use them as refrigerants to directly fill the HFC-134a heat pump unit.

Example 3: Take 60 ^mass % HFC-245fa and 40 ^mass % HFC-134a, mix them physically at room temperature, and use them as refrigerants to directly fill the HFC-134a heat pump unit.

Example 4: Take 70 ^mass % HFC-245fa and 30 ^mass % HFC-134a, mix them physically at room temperature, and use them as refrigerants to directly fill the HFC-134a heat pump unit.

Example 5: Take 80 ^mass % HFC-245fa and 20 ^mass % HFC-134a, mix them physically at room temperature, and use them as refrigerants to directly charge the HFC-134a heat pump unit.

Example 6: Take 90 ^mass % HFC-245fa and 10 ^mass % HFC-134a, mix them physically at room temperature, and use them as refrigerants to directly fill the HFC-134a heat pump unit.

Under different proportions, it can be applied to high-temperature working conditions in different temperature ranges. Under the conditions of the above-mentioned implementation examples, the highest water temperature range that the heat pump unit can produce is 70-110°C, and the unit is always kept at a condensing pressure lower than 2.4MPa. The ideal state where the exhaust temperature is below 120°C.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (2)

1. An environmentally friendly non-azeotropic mixed refrigerant suitable for high-temperature heat pumps, characterized in that: the specific method is: physically mix HFC-245fa and HFC-134a two components according to the specified mass ratio at normal temperature , can be directly charged into the heat pump unit to become a high-temperature heat pump unit, producing hot water above 70-110°C. 2. An environmentally friendly non-azeotropic mixed refrigerant suitable for high-temperature heat pumps according to claim 1, characterized in that: the HFC-245fa accounts for 40-100%, and the HFC-134a accounts for 0-60% , The outlet water temperature changes accordingly between 70-110°C.