CN104789192A

CN104789192A - Novel refrigerating fluid suitable for medium and low temperature freezing and refrigerating system

Info

Publication number: CN104789192A
Application number: CN201510183918.9A
Authority: CN
Inventors: 杨昭; 冯彪; 田田; 翟瑞
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2015-04-17
Filing date: 2015-04-17
Publication date: 2015-07-22
Anticipated expiration: 2035-04-17
Also published as: CN104789192B

Abstract

The invention relates to a novel refrigerating fluid suitable for a medium and low temperature freezing and refrigerating system. The novel refrigerating fluid is suitable for refrigeration equipment in the field of medium and low temperature freezing such as refrigeration storages and refrigerated cabinets, can be used as a substitution of an R507A refrigerant and has a lower GWP (Global Warming Potential) value. The novel refrigerating fluid is prepared from R32 (difluoromethane), R290 (propane), R134a (1,1,1,2-tetrafluoroethane) and R1234yf (2,3,3,3-tetrafluoropropylene). The refrigerating fluid disclosed by the invention is zero in ODP, obviously lower than R507A in GWP value, and remarkable in environmental protection advantage; compared with R507A, the system charge amount is reduced, and the insecurity due to leakage of the refrigerating fluid is indirectly reduced; COP of the novel refrigerating fluid is greatly improved, the performance advantage is remarkable, and the novel refrigerating fluid has the advantages of saving energy and reducing emission; the novel refrigerating fluid can be directly applied to the freezing and refrigerating system of R507A, and the replacement of multiple parts cannot be required or only a part of parts are required to be changed.

Description

Be applicable to the novel refrigerant of middle cryogenic freezing reefer system

Technical field

The invention belongs to the novel refrigerant in middle cryogenic refrigerating system field, be particularly useful for cryogenic freezing reefer system in freezer, refrigerator etc.

Background technology

After international community reaches the decision accelerating to eliminate the higher HCFCs class refrigeration agent of global warming potential (GWP) in the Montreal protocol in September, 2007, China and the United States in 2014 are co-present " Sino-U.S.'s climate change joint statement " again, and two countries will strengthen bilateral cooperation starting to cut down in the HFC with high global warming potential.For cryogenic refrigerating system field in freezer, refrigerator etc., R507A as the substitute (HFC class) of R502 refrigeration agent although at heat transfer property, the aspects such as hypotoxicity are with the obvious advantage, ODP value is zero, but its GWP value is 3800, still higher, obviously it is matter of time by the refrigerant replacement of lower GWP value.So become increasingly conspicuous in view of current environmental problem, the new refrigeration agent being applicable to the low GWP value in middle cryogenic freezing field must be found.

Summary of the invention

The object of this invention is to provide a kind of novel environment-friendly refrigerant, be suitable for cryogenic freezing field refrigeration equipment in freezer, refrigerator etc., as the surrogate of R507A refrigeration agent, and lower GWP value can be had.Considering the thermomechanical property of alternative refrigerant, environmental performance and directly under the factor such as perfusion, the present invention proposes the surrogate of quaternary mixture R32/R290/R134a/R1234yf as R507A refrigeration agent.

Novel refrigerant of the present invention, by R32 (methylene fluoride), R290 (propane), R134a (1,1,1,2-Tetrafluoroethane) and R1234yf (2,3,3,3-tetrafluoeopropene) composition, concrete mass percent is as follows:

Preferably, the concrete mass percent of each constituent element of novel refrigerant composition of the present invention is as follows:

The preparation method of novel refrigerant of the present invention is, the quality proportioning that four kinds of constituent element materials are specified by it is carried out physical mixed at normal temperatures.The basic physical properties of four kinds of constituent elements is as table 1:

The basic parameter of contained constituent element in table 1 novel refrigerant of the present invention

Tb: normal boiling point, Tc: critical temperature, Pc: emergent pressure

Beneficial effect

The present invention has the following advantages and beneficial effect:

1. have that ODP is zero, GWP value is starkly lower than R507A value, there is obvious environment-friendly advantage;

2. compare R507A system filling quantity to reduce, indirectly reduce the insecurity of leakage of refrigerant;

3. compare R507A, new refrigerant COP improves a lot, and performance advantage is comparatively obvious, has the advantage of energy-saving and emission-reduction.

4. can directly apply to the freezing and refrigerating system of R507A, not need to do multipart replacing, or only do the change of section components.

This patent obtain the R507A refrigeration agent that can substitute the higher GWP value of tool as early as possible, for the development of China at middle cryogenic freezing refrigeration field environmental protection refrigerant, and accelerate the superseded significant of high GWP value refrigeration agent.

Embodiment

With some specific embodiments, the present invention is described in detail below.(note: the formula of section Example has certain combustibility).

Embodiment 1: get 1%R32a, 37%R290,60%R134a, 2%R1234yf, using after physical mixed under these four kinds of component normal temperature as refrigeration agent.

Embodiment 2: get 4%R32a, 60%R290,35%R134a, 1%R1234yf, using after physical mixed under these four kinds of component normal temperature as refrigeration agent.

Embodiment 3: get 7%R32a, 38%R290,46%R134a, 9%R1234yf, using after physical mixed under these four kinds of component normal temperature as refrigeration agent.

Embodiment 4: get 12%R32a, 35%R290,40%R134a, 13%R1234yf, using after physical mixed under these four kinds of component normal temperature as refrigeration agent.

Embodiment 5: get 19%R32a, 50%R290,30%R134a, 1%R1234yf, using after physical mixed under these four kinds of component normal temperature as refrigeration agent.

Embodiment 6: get 35%R32a, 25%R290,20%R134a, 20%R1234yf, using after physical mixed under these four kinds of component normal temperature as refrigeration agent.

Relevant parameters and the cycle performance index of above-mentioned 6 embodiments are as shown in table 2:

Table 2 embodiment 1 ~ 6 relatively R507A filling quantity and comparing with the GWP value of R507A

	Relative molecular mass g/mol	Relative R507A filling quantity	GWP
				R507A	98.859	100％	3800
Embodiment 1	68.311	69.10％	836.65
				Embodiment 2	55.886	56.53％	520.18
Embodiment 3	65.528	66.28％	688.32
				Embodiment 4	65.342	66.10％	641.49
Embodiment 5	55.497	56.14％	557.08
				Embodiment 6	62.069	62.79％	530.48

Be taken as in the design conditions of the refrigeration system of the freezing and refrigeration such as freezer, refrigerator: semi-enclosed compressor worst cold case (GB10871-89) is taken as: vaporization temperature=-23 DEG C, superheating temperature=28 DEG C, condensing temperature=43 DEG C, condensate depression=5 DEG C, during calculating, compressor isentropic efficiency is 0.8.

Theoretical Calculation uses the freezing and refrigeration refrigeration system cycle performance parameter such as freezer, refrigerator when above-mentioned embodiment and R507A refrigeration agent respectively, compare performance perameter wherein: evaporating pressure, condensing pressure, pressure ratio, compressor exhaust temperature, temperature glide, relative performance coefficient COP and relative unit volume refrigerating capacity compressor qv, as shown in table 3.

Result shows: 1. all remarkable GWP value lower than R507A of the GWP value of above-described embodiment, and be only about 1/5 of the GWP value of R507A, the alternative refrigerant as R507A has obvious advantage in environmental protection; 2. found by the comparison of filling quantity of refrigerant, the filling quantity of new refrigerant relative to R507A, be only about its 56% ~ 70%, the filling quantity of refrigerant of system can be reduced accordingly, improve the security of system to a certain extent; 3. the comparison additionally by performance perameter finds, the coefficient of performance of the whole system of application new refrigerant is significantly improved, except the refrigerating effect per unit swept volume of section Example and R507A refrigerating effect per unit swept volume close to except, all be significantly improved, show that new refrigerant has energy-efficient advantage; 4. can also be found out by calculation result, new refrigerant is compared with R507A, and the saturated evaporating pressure of refrigeration agent of its above-described embodiment, condensing pressure and corresponding pressure ratio are all more or less the same with the latter.The exhaust temperature of the compressor of section Example slightly improves, and most of embodiment is more or less the same.So from demonstrating the feasibility adopting direct filling type replacement scheme with upper angle.

Table 3 the present invention 6 embodiments compare with R507A performance perameter

According to introduction of the present invention, the freezing and refrigeration such as freezer, refrigerator refrigeration equipment is under above design conditions, and within the scope of the preferred proportion of above Theoretical Calculation, coefficient of performance COP is significantly improved, refrigerating effect per unit swept volume and R507A close, and system filling quantity has obvious reduction.Outstanding advantage is GWP value remarkable reduction compared with R507A of new refrigerant.To sum up, the present invention has extraordinary effect and development potentiality.

The environmental protection refrigerant that the present invention discloses and proposes, those skilled in the art are by using for reference present disclosure, the links such as appropriate change raw material and operational path realize, although method of the present invention and technology of preparing are described by preferred embodiment, person skilled obviously can change Method and Technology route as herein described or reconfigure not departing from content of the present invention, spirit and scope, realizes final technology of preparing.Special needs to be pointed out is, all similar replacements and change apparent to those skilled in the art, they are deemed to be included in spirit of the present invention, scope and content.

Claims

1. be applicable to the novel refrigerant of middle cryogenic freezing reefer system, by R32 (methylene fluoride), R290 (propane), R134a (1,1,1,2-Tetrafluoroethane) and R1234yf (2,3,3,3-tetrafluoeopropene) composition, concrete mass percent is as follows:

2. refrigeration agent as claimed in claim 1, is characterized in that the concrete mass percent of composition is as follows: