CN106032463B - A kind of gravity assisted heat pipe mixed working fluid - Google Patents
A kind of gravity assisted heat pipe mixed working fluid Download PDFInfo
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- CN106032463B CN106032463B CN201510113141.9A CN201510113141A CN106032463B CN 106032463 B CN106032463 B CN 106032463B CN 201510113141 A CN201510113141 A CN 201510113141A CN 106032463 B CN106032463 B CN 106032463B
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Abstract
The present invention provides a kind of gravity assisted heat pipe mixed working fluids.The mixed working fluid contains HC600a and HFC245fa and HFO1234ze or HFO1234yf, can also contain HFC32 or HFC152a.The thermal stability of the working medium is good, safe and non-toxic, meets environmental requirement: ODP 0, GWP are lower.For the mixed working fluid under 0 DEG C of -100 DEG C of operating temperature, saturated vapor pressure is moderate, and heat conveyance performance is suitable for that the criterion numeral M' higher of reflection ermal physics and comprehensive performance of conducting heat has good heat transfer characteristic and transport property.
Description
Technical field
The present invention relates to a kind of heat-pipe working mediums, more specifically to a kind of room temperature containing HC600a and HFC245fa
Gravity assisted heat pipe working medium.
Background technique
Gravity assisted heat pipe is a kind of heat exchanger that high efficient heat exchanging is carried out using phase transformation.By evaporator section, adiabatic section and condensation segment three
Part forms, and when work needs heat source in lower end, cold source in upper end.It does not need additionaling power and achieves that voluntarily cycle operation, be
Static equipment.The gravity heat pipe heat exchanger to work within the scope of 0-100 DEG C has wide development space.The normal-temperature gravity heat pipe can
For effectively cooling down base station and electronic equipment, high-quality realize the heat exchange of indoor and outdoor hot and cold air to reduce air conditioning energy consumption, effectively
Utilize industrial middle-low temperature heat, environmentally friendly exploitation of geothermal resource.
Gravity heat pipe heat exchanger will realize efficient operation, and a key factor is the heat-pipe working medium that have suitable.Currently,
From suitable work in terms of hot physical property angle 0-100 DEG C of normal-temperature gravity heat pipe working medium mainly have water, ammonia, methanol, ethyl alcohol, acetone,
Toluene and freon substance R22 etc., these working medium, which exist, is respectively difficult to the shortcomings that overcoming: the start-up temperature of water is high, preferably
Apply the working environment at 50-200 DEG C, and with carbon steel is incompatible increases heat pipe cost；Ammonia, methanol, ethyl alcohol, acetone and first
Benzene etc. is generally not only toxic but also combustible, it is difficult to large-scale promotion application；R22 was once widely used in refrigeration, air-conditioning and heat pump system
In system, compared with above-mentioned substance, have in terms of safety, stability and with the compatibility of heat exchanger materials more significant excellent
Gesture, but due to it destroys atmospheric ozone layer, aggravation greenhouse effects etc., developing country disabled in developed country
Face the problem of gradually disabling；Also, R22 is more suitable within the scope of 0-60 DEG C, because evaporating temperature is at 60 DEG C or more, is corresponded to
Saturation pressure will be above 2.5MPa, such as 70 DEG C when be 2.99MPa.
To sum up, it is the room temperature heat source for efficiently utilizing 0-100 DEG C, needs to develop environment-friendly energy-saving, safe and reliable room temperature
Gravity assisted heat pipe working medium.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of suitable for the mixed of normal-temperature gravity heat pipe
Close working medium, it is environmental-friendly, and in 0-100 DEG C of normal-temperature gravity heat pipe operating temperature range have good heat transfer characteristic and
Transport property.
A kind of gravity assisted heat pipe mixed working fluid of the invention is achieved in that
A kind of gravity assisted heat pipe mixed working fluid, the mixed working fluid contain HC600a and HFC245fa and HFO1234ze or
One of HFO1234yf；The mixed working fluid can also contain one of HFC32 or HFC152a.
In the specific implementation, the working medium includes HC600a and HFC245fa, also may include other substances:
(1) mixed working fluid is made of HFO1234ze, HC600a and HFC245fa；It is described in the mixed working fluid
The mass percent of HFO1234ze is 3%-60%, and the mass percent of the HC600a is 2%-45%, the HFC245fa
Mass percent be 5%-95%.
(2) mixed working fluid is made of HFO1234yf, HC600a and HFC245fa；It is described in the mixed working fluid
The mass percent of HFO1234yf is 3%-60%, and the mass percent of the HC600a is 2%-45%, the HFC245fa
Mass percent be 5%-95%.
(3) mixed working fluid is made of HFO1234ze, HFC32, HC600a and HFC245fa；In the mixed working fluid
In, the mass percent of the HFO1234ze is 3%-60%, and the mass percent of the HFC32 is 2%-80%, described
The mass percent of HC600a is 2%-45%, and the mass percent of the HFC245fa is 5%-93%.
(4) mixed working fluid is made of HFO1234ze, HFC152a, HC600a and HFC245fa；In the mixing work
In matter, the mass percent of the HFO1234ze is 3%-60%, and the mass percent of the HFC152a is 2%-80%, institute
The mass percent for stating HC600a is 2%-45%, and the mass percent of the HFC245fa is 5%-93%.
(5) mixed working fluid is made of HFO1234yf, HFC32, HC600a and HFC245fa；In the mixed working fluid
In, the mass percent of the HFO1234yf is 3%-60%, and the mass percent of the HFC32 is 2%-80%, described
The mass percent of HC600a is 2%-45%, and the mass percent of the HFC245fa is 5%-93%.
(6) mixed working fluid is made of HFO1234yf, HFC152a, HC600a and HFC245fa；In the mixing work
In matter, the mass percent of the HFO1234yf is 3%-60%, and the mass percent of the HFC152a is 2%-80%, institute
The mass percent for stating HC600a is 2%-45%, and the mass percent of the HFC245fa is 5%-93%.
The basic thermal physical property data of pure matter of mixed working fluid each component of the present invention is shown in Table 1；It, will be each when preparing the mixed working fluid
Component carries out physical mixed by certain quality proportioning at normal temperature.
Table 1
Gravity assisted heat pipe working medium needs under the temperature difference driving in the enclosed space, between heat source and cold source, and automatic circulating is complete
Exothermic diabatic process is condensed at heat absorption vaporization, insulation transmission, liquefaction.It is unlike vapour pressures such as refrigeration, air-conditioning and heat pumps
Contracting formula circulation has compressor to provide power for working medium circulation, therefore to realize that the normal operation of gravity assisted heat pipe needs to consider many limits
Factor and the limit processed, such as entrainment limit, the boiling limit, the sticky limit, sonic limit.And the range and heat pipe of otherwise limit
The hot physical property of working medium is closely related.To sum up, because of the specific working principle of gravity assisted heat pipe, operation characteristic and applicable situation, so that work
The selection criteria of matter is different from the selection of conventional refrigerant, air-conditioning and heat pump fluid.
When screening gravity assisted heat pipe working medium, following principle is generally followed:
(1) working medium should adapt to the operating temperature section of gravity assisted heat pipe, and have suitable boiling point, critical point and saturated vapor
Pressure.It avoids causing to start excessive temperature differentials, so that gravity assisted heat pipe cannot be normal in operating temperature section because saturated vapor pressure is too small
Start work；It is excessive, need increasing heat exchange of heat pipe wall thickness to reduce economy.
(2) working medium should have good comprehensive thermophysical property and heat transfer property.Working medium criterion numeral M'(Merit
It Number) is an important indicator for measuring above-mentioned performance.
(3) working medium meets the requirement of economy, toxicity, environmental pollution etc..It is required that the ozone layer destroying gesture (ODP of working medium
Value) it is zero, global warming effect gesture (GWP value) is as small as possible, is easy to get simultaneously, and it is cheap, securely and reliably.
Suitable saturated vapor pressure and higher working medium criterion numeral are the important thermal physical property parameter for screening gravity assisted heat pipe, composition
The pure matter saturated vapor pressure and criterion numeral variation with temperature situation of mixed working fluid are shown in attached drawing 1 and attached drawing 2.
It forms in 6 kinds of pure matter of mixed working fluid of the present invention, the comprehensive performance of R600a is best, in -10 DEG C of -100 DEG C of ranges
Interior, moderate pressure, criterion numeral is more excellent.The comprehensive performance of R245fa is taken second place.The average criteria number of R32 is highest in 6 kinds of working medium
, but when saturated vapor is pressed in 40 DEG C of temperature, has reached 2.47MPa, is then 4.87MPa at 70 DEG C, hypertonia is only suitable for
Within the scope of -10-40 DEG C.There is also same problems by R152a.
The application comprehensively considers the saturated vapor pressure of each pure matter, criterion numeral, inhibits the factors such as combustibility, and screening, proportion are mixed
Close working medium.Enable mixed working fluid by adjusting composition and ratio, guarantees the different running temperatures within the scope of -10 DEG C -100 DEG C
Lower gravity assisted heat pipe has excellent integrated operation performance.
Heat-pipe working medium of the invention has the advantages that
(1) under given operating temperature, it can guarantee that working medium is saturated by adjusting the ratio of each component in mixed working fluid
Vapour pressure is moderate.
(2) meet environmental requirement: ODP 0, GWP is lower, while thermal stability is good, safe and non-toxic.
(3) heat conveyance performance is suitable for working under operating condition in room temperature heat pipe, the criterion of reflection ermal physics and comprehensive performance of conducting heat
Number M' higher.The expression of gravity assisted heat pipe working medium criterion numeral M' is as follows:
The dimension of criterion numeral M' is in formulaWherein L is the latent heat of vaporization, unit (kJ/kg)；ρlFor saturated liquid
Density, units/kg/m3；klFor saturated liquid thermal conductivity, unit W/ (mK)；μlFor hydrodynamic viscosity, unit Pas.
(4) in operating temperature range, make mixed working fluid criterion numeral and R22 phase by changing mixed working fluid each component ratio
When or it is more preferable.
Detailed description of the invention
Fig. 1 is that the saturated vapor pressure for the pure matter for forming mixed working fluid of the present invention varies with temperature situation.
Fig. 2 is that the working medium criterion numeral M' for the pure matter for forming mixed working fluid of the present invention varies with temperature situation
Specific embodiment
Technical solution of the present invention is described in further detail below with reference to embodiment, protection scope of the present invention is not limited to following
Specific embodiment.
Mixed working fluid in the present invention is zeotrope, corresponding with saturated vapor pressure full in the examples below
It is bubble point temperature with temperature, the content of each component is mass percent.
Embodiment 1
10%HFO1234ze, 35%HFC32,10%HC600a, 45%HFC245fa are taken, it is mixed to carry out physics at normal temperature
Gravity assisted heat pipe working medium is used as after conjunction.
Embodiment 2
5%HFO1234yf, 36%HFC32,12%HC600a, 47%HFC245fa are taken, carries out physical mixed at normal temperature
It is used as gravity assisted heat pipe working medium afterwards.
Within the scope of 0-60 DEG C, every 5 DEG C, the saturated vapor pressure and criterion numeral of embodiment 1-2 mixed working fluid and R22 are calculated
M' the results are shown in Table 2.
Table 2
As shown in Table 2, within the scope of 0-60 DEG C, the saturated vapor pressure of mixed working fluid is close with R22 in embodiment 1-2, and
M' is then better than R22.
Embodiment 3
45%HFO1234ze, 10%HC600a, 45%HFC245fa are taken, is used as weight after carrying out physical mixed at normal temperature
Power heat-pipe working medium.
Embodiment 4
38%HFO1234yf, 17%HC600a, 55%HFC245fa are taken, is used as weight after carrying out physical mixed at normal temperature
Power heat-pipe working medium.
Embodiment 5
5%HFO1234ze, 30%HFC152a, 15%HC600a, 50%HFC245fa are taken, it is mixed to carry out physics at normal temperature
Gravity assisted heat pipe working medium is used as after conjunction.
Embodiment 6
6%HFO1234yf, 28%HFC152a, 10%HC600a, 56%HFC245fa are taken, it is mixed to carry out physics at normal temperature
Gravity assisted heat pipe working medium is used as after conjunction.
Within the scope of 0-100 DEG C, every 5 DEG C, mixed working fluid saturated vapor pressure and criterion numeral M' in embodiment 3-6 are calculated,
It the results are shown in Table 3.
Table 3
As shown in Table 3, within the scope of 0-100 DEG C, the saturated vapor pressure of mixed working fluid is moderate in embodiment 3-6, and low
In the 2.8MPa that heat exchanger in engineering requires.As shown in Table 3, the M' of working medium is reduced as the temperature rises in this temperature range,
But still in optimum range.
Claims (1)
1. a kind of gravity assisted heat pipe mixed working fluid, which is characterized in that
The gravity assisted heat pipe mixed working fluid is made of HFO1234yf, HFC152a, HC600a and HFC245fa,
Wherein, the mass percent of the HFO1234yf is 3%-60%, and the mass percent of the HFC152a is 2%-
The mass percent of 80%, the HC600a are 2%-45%, and the mass percent of the HFC245fa is 5%-93%.
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| CN106032463B true CN106032463B (en) | 2019-04-26 |
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| CN111253912B (en) * | 2020-03-20 | 2021-02-26 | 珠海格力电器股份有限公司 | Environment-friendly mixed refrigerant replacing R290 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101796154A (en) * | 2007-07-05 | 2010-08-04 | 霍尼韦尔国际公司 | The composition of tetrafluoeopropene and hydrocarbon |
| CN104350339A (en) * | 2012-06-08 | 2015-02-11 | 通用电气公司 | Dual evaporator refrigeration system using zeotropic refrigerant mixture |
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2015
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101796154A (en) * | 2007-07-05 | 2010-08-04 | 霍尼韦尔国际公司 | The composition of tetrafluoeopropene and hydrocarbon |
| CN104350339A (en) * | 2012-06-08 | 2015-02-11 | 通用电气公司 | Dual evaporator refrigeration system using zeotropic refrigerant mixture |
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