CN101851490B - Refrigerant composition capable of replacing HFC-134a - Google Patents

Abstract

The invention discloses a refrigerant composition that can replace HFC-134a, which consists of 2,3,3,3-tetrafluoropropene (HFO-1234yf), trans-1,3,3,3-tetrafluoropropene ( HFO-1234ze(E)) and 1,1-difluoroethane (HFC-152a). Ozone depletion potential (ODP) of the present invention is zero, global warming potential (GWP) is very low, meets the requirement of environmental protection, and the physical properties of the present invention and HFC-134a are equivalent, can be directly used in existing HFC-134a system, No compressor redesign is required.

Description

Refrigerant composition that can replace HFC-134a

technical field

The invention relates to a refrigerant composition, in particular to a refrigerant composition which can replace HFC-134a in existing refrigeration, air-conditioning or heat pump equipment using HFC-134a.

Background technique

Freons represented by HCFC-22, CFC-12, and CFC-11 have excellent thermodynamic cycle performance and are widely used in refrigeration, air conditioning and other industries. However, such substances have high ozone depletion potential (ODP), stay in the atmosphere for a long time, and have high global warming potential (GWP). They are one of the main chemical substances that destroy the atmospheric ozone layer and produce the greenhouse effect. After the ozone layer is destroyed, harmful ultraviolet radiation will directly reach the surface of the earth, causing serious damage to crops and phytoplankton in the ocean, and will also affect the human immune system, increasing the incidence of skin cancer and cataracts. Global warming is another severe environmental problem faced by human beings, which has brought serious consequences to the ecological environment, and the massive discharge of refrigerants whose GWP value is thousands of times that of carbon dioxide has also played a role in fueling the flames. The "Montreal Protocol" and its amendments have basically banned CFC substances, and stipulated a gradual reduction to the final ban on the use of HCFC-22. In recent years, the development of refrigerant substitute products has been one of the important research topics in organic fluorine chemical industry and related fields.

The currently used refrigerant substitutes are mainly HFC-134a, R410A and R407C. However, these refrigerants have their own advantages and disadvantages, and they are still not very ideal. Among them, the heat transfer performance of R407C is poor, and the volume cooling capacity and COP value under the same working conditions are smaller than HCFC-22. In order to achieve the same cooling capacity as HCFC-22, it is necessary to strengthen the heat transfer effect of the heat exchanger, and the manufacturing cost will increase. The volumetric cooling capacity of R410A is much larger than that of HCFC-22, but its evaporation pressure and condensation pressure are also much higher than that of HCFC-22. Roads and systems, and both of these two mixed refrigerants have high GWP values, and a large amount of emissions will aggravate global warming. HFC-134a has excellent thermodynamic properties and good safety in use, and has become a widely used refrigerant in the refrigeration and air-conditioning industry at home and abroad. Its ODP is zero, but its GWP is still high, and a large amount of use will also cause global warming. The fluorinated greenhouse gas (F-gas) control regulations passed by the EU in 2004 require that from January 1, 2011, the EU will prohibit the use of refrigerants with a GWP value greater than 150 in new automotive air conditioners, and from January 2017 From the 1st, all automotive air conditioners are prohibited from using refrigerants with a GWP greater than 150. Therefore, research on low-GWP refrigerants and their matching systems has become a trend and necessity for the development of the refrigeration, air-conditioning and heat pump industries.

Contents of the invention

The purpose of the present invention is to research and develop a refrigerant composition that can replace HFC-134a, so that the ODP of the newly developed refrigerant can be zero and global warming can be suppressed, especially to develop a kind of cycle performance equivalent to HFC-134a, A refrigerant that can be directly used in existing HFC-134a systems and can be used as a long-term replacement for HFC-134a.

For realizing the above object, technical solution of the present invention is:

The present invention is a refrigerant composition that can replace HFC-134a, which consists of 2,3,3,3-tetrafluoropropene (HFO-1234yf), trans-1,3,3,3-tetrafluoropropene (HFO -1234ze(E)) and 1,1-difluoroethane (HFC-152a), the mass percent of each component is:

2,3,3,3-Tetrafluoropropene (HFO-1234yf): 30% to 70%;

trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)): 5% to 30%;

1,1-Difluoroethane (HFC-152a): 25% to 60%.

The preparation method of the refrigerant composition provided by the present invention is to combine 2,3,3,3-tetrafluoropropene (HFO-1234yf), trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E )) and 1,1-difluoroethane (HFC-152a) are physically mixed at normal temperature according to their specified mass ratio.

The present invention has the following advantages and beneficial effects:

1. The ODP value of the present invention is zero, and the GWP is very low (less than 150), which meets the requirements of environmental protection. Table 1 lists the basic parameters of each component of the present invention.

2. The thermal parameters are very close to those of HFC-134a. The present invention can be directly filled in the existing refrigeration, air-conditioning or heat pump units using HFC-134a, without specially designing the compressor and its system for the present invention.

3. Excellent cycle performance. The COP value of the present invention is equivalent to that of HFC-134a, and the volumetric refrigeration capacity is also very close to that of HFC-134a. When replacing HFC-134a, there is no need to replace system components and pipelines, which meets the long-term development requirements of HFC-134a replacement.

In a word, the refrigerant composition provided by the present invention is developed to meet the replacement of refrigerants for refrigeration, air conditioning or heat pumps, especially can be used in the existing HFC-134a system to replace HFC-134a, and its thermal performance is higher than that of HFC-134a. 134a is equivalent and meets the requirements of environmental protection.

Table 1 Basic parameters of components contained in environmentally friendly refrigerants

components name molecular weight Standard boiling point ℃ Critical temperature °C Critical pressure MPa ODP GWP HFO-1234yf 2,3,3,3-Tetrafluoropropene 114.04 -29.45 94.7 3.382 0 4 HFO-1234ze(E) trans-1,3,3,3-tetrafluoropropene 114.04 -18.95 109.37 3.636 0 4 HFC-152a 1,1-Difluoroethane 66.05 -24.02 113.26 4.517 0 120

The present invention will be further described below in conjunction with specific examples.

Detailed ways

The present invention is a refrigerant composition that can replace HFC-134a, which consists of 2,3,3,3-tetrafluoropropene (HFO-1234yf), trans-1,3,3,3-tetrafluoropropene (HFO -1234ze(E)) and 1,1-difluoroethane (HFC-152a), the mass percent of each component is:

Example 1: 30% of HFO-1234yf, 10% of HFO-1234ze(E), and 60% of HFC-152a were used as refrigerant after physical mixing at room temperature.

Example 2: 35% of HFO-1234yf, 30% of HFO-1234ze(E), and 35% of HFC-152a were used as refrigerant after physical mixing at room temperature.

Example 3: 40% of HFO-1234yf, 10% of HFO-1234ze(E), and 50% of HFC-152a were used as refrigerant after physical mixing at room temperature.

Example 4: 45% of HFO-1234yf, 15% of HFO-1234ze(E), and 40% of HFC-152a were used as refrigerant after physical mixing at room temperature.

Example 5: 55% of HFO-1234yf, 10% of HFO-1234ze(E), and 35% of HFC-152a were used as refrigerant after physical mixing at room temperature.

Example 6: 70% of HFO-1234yf, 5% of HFO-1234ze(E), and 25% of HFC-152a were physically mixed at room temperature as a refrigerant.

The design conditions of the refrigeration system are taken as follows: the average evaporation temperature is 2°C, the average condensation temperature is 60°C, the degree of superheat is 5°C, and the degree of subcooling is 5°C. According to cycle calculations, the relevant parameters and cycle performance indicators of the above examples As shown in table 2. The parameters of HFC-134a are also listed in Table 2 for comparison.

Table 2 performance of the embodiment of the present invention

Parameters and performance Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 HFC-134a Evaporation pressure MPa 0.311 0.314 0.321 0.327 0.336 0.347 0.315 Condensing pressure MPa 1.605 1.609 1.637 1.653 1.681 1.707 1.682 pressure ratio 5.15 5.12 5.10 5.06 5.0 4.92 5.35 Mass cooling capacity KJ/kg 161.63 133.96 148.25 137.26 129.42 116.95 125.23 Volume cooling capacity KJ/m3 1877 1801 1878 1865 1873 1860 1884 COP 3.55 3.45 3.50 3.46 3.42 3.36 3.49 ODP 0 0 0 0 0 0 0 GWP 73.6 38.3 62 50.4 44.6 33 1300

As can be seen from Table 2, the present invention is closer to each performance and parameter of HFC-134a, and the ozone destruction potential (ODP) of the present invention is zero, can not destroy atmospheric ozone layer, and greenhouse effect potential (GWP) is very low, Meet the requirements of environmental protection.

Preparation:

The preparation method of the refrigerant composition provided by the present invention is to combine 2,3,3,3-tetrafluoropropene (HFO-1234yf), trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E )) and 1,1-difluoroethane (HFC-152a) are physically mixed at normal temperature according to their specified mass ratio.

Claims (1)

1. the refrigerant composition earl august eugene lund ian robert of an alternative HFC-134a is characterized in that: it is by 2,3,3,3-tetrafluoeopropene, trans-1, and 3,3,3-tetrafluoeopropene and 1, the 1-C2H4F2 C2H4F2 is formed, and the mass percent of each component is:

2,3,3,3-tetrafluoeopropene: 30%～70%;

Trans-1,3,3,3-tetrafluoeopropene: 5%～30%;

1,1-C2H4F2 C2H4F2: 25%～60%.