WO1984001166A1 - Fluids for use in sorption refrigerators and heat pumps - Google Patents
Fluids for use in sorption refrigerators and heat pumps Download PDFInfo
- Publication number
- WO1984001166A1 WO1984001166A1 PCT/GB1983/000232 GB8300232W WO8401166A1 WO 1984001166 A1 WO1984001166 A1 WO 1984001166A1 GB 8300232 W GB8300232 W GB 8300232W WO 8401166 A1 WO8401166 A1 WO 8401166A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat
- refrigerant
- absorbent
- fluids
- mixture
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
- C09K5/047—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for absorption-type refrigeration systems
Definitions
- the present invention relates to absorption heat transfer machines for transferring heat against a temperature gradient, and to working fluids for use therein.
- Machines which transfer heat against a temperature gradient i.e. from a relatively cold heat source to a heat sink at higher temperatures are well known. These machines may be described as refrigerating machines. Refrigerating machines working on the absorption principle are well known. In such absorption heat transfer machines a pair of working substances is used which may be described as a refrigerant and an absorbent. The heat transfer process takes place in a closed system. Heat is taken into the system from outside by evaporation of the refrigerant in an evaporator. The evaporated refrigerant then passes to an absorber in which the refrigerant is absorbed in an absorbent which is poor in refrigerant. Heat is produced by the absorption and is given up to an external coolant.
- the liquid absorbent now rich in refrigerant, is passed to a second evaporator (the generator) where heat is supplied to drive out the refrigerant from the absorbent.
- the resulting solution poor in refrigerant is returned to the absorber.
- the refrigerant vapour is cooled and liquefied by heat exchange with an external coolant and then returned to the first evaporator.
- Refrigerating machines may be used either to withdraw heat from material which it is desired to cool in which case they may be termed as refrigerators. Alternatively they may be used to introduce heat into material which it is desired to heat eg the air inside a house.
- Machines intended for heating may be the conventional heat pumps in which heat at a relatively high temperature provides the energy to transfer heat from a relatively low temperature heat source to a heat sink at an Intermediate temperature.
- heat may be supplied from a heat source at an intermediate temperature and transferred to a heat sink at a relatively high temperature by making use of the energy obtained by the transfer of some of the heat down a temperature gradient from the heat source at intermediate temperature to a second heat sink at a lower temperature.
- Such machines may be described as heat transformers.
- Working fluid pairs (refrigerant and absorbent) for use in absorption refrigerating machines should in particular satisfy the following requirements:
- the mixture of refrigerant and absorbent should not be solid in the range of compositions and working temperatures used,
- the present invention relates to a mixture of substances suitable for use in an absorption heat transfer machine, characterised in that the mixture comprises tetrahydrofuran and at least one of benzyl alcohol, diethyl sebacate, or quinoline.
- a process for transferring heat against a temperature gradient by an absorption process using a refrigerant which is tetrahydrofuran and an absorbent which is at least one of benzyl alcohol, diethyl sebacate, or quinoline The composition of the working fluid will of course vary in different parts of the heat transfer machine.
- the absorbent preferably is 50-952 by weight of the total weight of working fluid (refrigerant plus absorbent) in the heat transfer machine as a whole.
- the mixture of refrigerant and absorbent introduced into the machine may contain various additives such as corrosion inhibitors, stabilisers and/or surface active agents. These will generally remain in the absorbent unless they are volatile.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
Mixtures of tetrahydrofurane with at least one of benzyl alcohol, diethyl sebacate, or quinoline are useful as working fluids in absorption refrigerating machines.
Description
FLUIDS FOR USE IN SORPTION REFRIGERATORS AND HEAT PUMPS
The present invention relates to absorption heat transfer machines for transferring heat against a temperature gradient, and to working fluids for use therein.
Machines which transfer heat against a temperature gradient i.e. from a relatively cold heat source to a heat sink at higher temperatures are well known. These machines may be described as refrigerating machines. Refrigerating machines working on the absorption principle are well known. In such absorption heat transfer machines a pair of working substances is used which may be described as a refrigerant and an absorbent. The heat transfer process takes place in a closed system. Heat is taken into the system from outside by evaporation of the refrigerant in an evaporator. The evaporated refrigerant then passes to an absorber in which the refrigerant is absorbed in an absorbent which is poor in refrigerant. Heat is produced by the absorption and is given up to an external coolant.
The liquid absorbent, now rich in refrigerant, is passed to a second evaporator (the generator) where heat is supplied to drive out the refrigerant from the absorbent. The resulting solution poor in refrigerant is returned to the absorber. The refrigerant vapour is cooled and liquefied by heat exchange with an external coolant and then returned to the first evaporator.
Refrigerating machines may be used either to withdraw heat from material which it is desired to cool in which case they may be termed as refrigerators. Alternatively they may be used to introduce heat into material which it is desired to heat eg the air inside a house.
Machines intended for heating may be the conventional heat pumps in which heat at a relatively high temperature provides the energy to transfer heat from a relatively low temperature heat source to a heat sink at an Intermediate temperature. Alternatively heat may be supplied from a heat source at an intermediate temperature and transferred to a heat sink at a relatively high temperature by making use of the energy obtained by the transfer of some of the heat down a temperature gradient from the heat source at intermediate temperature to a second heat sink at a lower temperature. Such machines may be described as heat transformers.
Working fluid pairs (refrigerant and absorbent) for use in absorption refrigerating machines should in particular satisfy the following requirements:
(a) the difference in boiling temperature between the refrigerant and the mixture of refrigerant and adsorbent should be as great as possible,
(b) the mixture of refrigerant and absorbent should not be solid in the range of compositions and working temperatures used,
(c) the mixture of refrigerant and absorbent should be thermally stable,
(d) the expenditure of energy required for rectifying the mixture evaporated from the generator in order to separate the absorbent from the refrigerant should be low,
(e) the viscosity of the mixture of refrigerant and absorbent in the range of working temperatures and compositions should be low.
The present invention relates to a mixture of substances suitable for use in an absorption heat transfer machine, characterised in that the mixture comprises tetrahydrofuran and at least one of benzyl alcohol, diethyl sebacate, or quinoline. According to a further aspect of the present invention there is provided a process for transferring heat against a temperature gradient by an absorption process using a refrigerant which is tetrahydrofuran and an absorbent which is at least one of benzyl alcohol, diethyl sebacate, or quinoline.
The composition of the working fluid will of course vary in different parts of the heat transfer machine. However the absorbent preferably is 50-952 by weight of the total weight of working fluid (refrigerant plus absorbent) in the heat transfer machine as a whole. The mixture of refrigerant and absorbent introduced into the machine may contain various additives such as corrosion inhibitors, stabilisers and/or surface active agents. These will generally remain in the absorbent unless they are volatile.
The present invention will now be illustrated by reference to the following examples.
Measurements were carried out on various absorbents and on mixtures of the absorbents containing 10% wt tetrahydrofuran and 90% wt absorbent. The stability of the mixtures was also determined by sealing samples into a glass ampoule and heating for 100 hours at 200°C. The samples were then examined by gas chromatography to test for the presence of decomposition products. None were found.
BP of tetrahydrofuran 65.5°C.
Claims
1. A mixture of substances suitable for use in an absorption heat transfer machine which mixture comprises tetrahydrofuran and at least one of benzyl alcohol, diethyl sebacate, or quinoline.
2. An absorption process for transferring heat against a temperature gradient using a refrigerant and an absorbent characterised in that the refrigerant is tetrahydrofuran and the absorbent is at least one of benzyl alcohol, diethyl sebacate, or quinoline.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823235560 DE3235560A1 (en) | 1982-09-25 | 1982-09-25 | FUEL PAIR FOR USE IN SORPTION REFRIGERATORS CONTAINING TETRAHYDROFURANE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1984001166A1 true WO1984001166A1 (en) | 1984-03-29 |
Family
ID=6174154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1983/000232 WO1984001166A1 (en) | 1982-09-25 | 1983-09-21 | Fluids for use in sorption refrigerators and heat pumps |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0120049A1 (en) |
DE (1) | DE3235560A1 (en) |
WO (1) | WO1984001166A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3543171A1 (en) * | 1985-12-06 | 1987-06-11 | Hoechst Ag | FABRIC PAIR FOR ABSORPTION HEAT TRANSFORMERS |
US5383341A (en) * | 1991-07-23 | 1995-01-24 | Uri Rapoport | Refrigeration, heating and air conditioning system for vehicles |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2614795A1 (en) * | 1975-04-10 | 1976-10-28 | Allied Chem | 2- (TERTIAERBUTOXYMETHYL) -TETRAHYDROFURAN AND ITS USES |
FR2307236A1 (en) * | 1975-04-10 | 1976-11-05 | Allied Chem | METHOD AND DEVICES FOR HEATING BY ABSORPTION, AND COMPOSITIONS USED FOR THIS PURPOSE, INCLUDING FLUOROHYDROCARBON SOLUTES DISSOLVED IN FURAN CORE ABSORBENTS |
FR2398101A2 (en) * | 1977-07-22 | 1979-02-16 | Allied Chem | COMPOSITIONS FOR HEATING BY ABSORPTION CONSISTING OF FLUOROCARBON SOLUTES DISSOLVED IN FURAN CORE ABSORBENTS |
-
1982
- 1982-09-25 DE DE19823235560 patent/DE3235560A1/en not_active Withdrawn
-
1983
- 1983-09-21 EP EP19830903003 patent/EP0120049A1/en not_active Withdrawn
- 1983-09-21 WO PCT/GB1983/000232 patent/WO1984001166A1/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2614795A1 (en) * | 1975-04-10 | 1976-10-28 | Allied Chem | 2- (TERTIAERBUTOXYMETHYL) -TETRAHYDROFURAN AND ITS USES |
FR2307236A1 (en) * | 1975-04-10 | 1976-11-05 | Allied Chem | METHOD AND DEVICES FOR HEATING BY ABSORPTION, AND COMPOSITIONS USED FOR THIS PURPOSE, INCLUDING FLUOROHYDROCARBON SOLUTES DISSOLVED IN FURAN CORE ABSORBENTS |
FR2398101A2 (en) * | 1977-07-22 | 1979-02-16 | Allied Chem | COMPOSITIONS FOR HEATING BY ABSORPTION CONSISTING OF FLUOROCARBON SOLUTES DISSOLVED IN FURAN CORE ABSORBENTS |
Also Published As
Publication number | Publication date |
---|---|
EP0120049A1 (en) | 1984-10-03 |
DE3235560A1 (en) | 1984-03-29 |
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