Refrigeration – Refrigeration producer – Sorbent type
Patent
1999-03-05
2000-12-12
Doerrler, William
Refrigeration
Refrigeration producer
Sorbent type
165 92, 261 90, F25B 1512, F24F 314, B01D 4716
Patent
active
061582379
DESCRIPTION:
BRIEF SUMMARY
This invention relates to heat transfer apparatus.
Known heat transfer apparatus are expensive and inefficient. Also, some use techniques and materials that are damaging to the environment.
According to one aspect of this invention there is provided heat transfer apparatus comprising a refrigeration assembly having a low pressure region and a high pressure region, a power generation assembly connected to the refrigeration assembly and a refrigerant adapted to circulate in said refrigeration assembly between said low and high pressure regions, the refrigeration assembly and the power generation assembly being so arranged that refrigerant in the high pressure region can be passed through the power generation assembly to the low pressure region of the refrigeration assembly, whereby power is generated by the power generation assembly on passage therethrough of the refrigerant.
Desirably the power generation assembly comprises a turbine or an engine to which high pressure refrigerant can be passed, and may further include an electrical generator for generating electric power.
The refrigeration assembly preferably includes a condenser to condense refrigerant in the refrigeration assembly and may further include an evaporator to receive refrigerant from the condenser, whereby the evaporator is adapted to evaporate said refrigerant. Pressure reducing means, which may comprise a valve, is conveniently arranged between the condenser and the evaporator to reduce the pressure of the refrigerant passed to the evaporator.
The refrigeration assembly may further include an absorber to receive low pressure evaporated refrigerant from the evaporator. The absorber may include an absorbent capable of absorbing the refrigerant to produce a strong refrigerant solution.
The refrigeration assembly may further include heating means to which the strong refrigerant solution can be passed to be heated, the heating means being adapted to vaporise at least some of the refrigerant from the strong refrigerant solution to produce high pressure refrigerant vapour and a weak refrigerant solution. The weak refrigerant solution is preferably thereafter returned to the absorber. The heating means may comprise a solar collector and, conveniently, gas burner.
Pumping means may be arranged between the heating means and the absorber to pump the strong refrigerant solution to the heating means. A pre-heater may be provided between the pumping means and the heating means to pre-heat the strong refrigerant solution prior to it being passed to the heating means.
The pre-heater is conveniently in the form of a heat exchanger through which low temperature strong refrigerant solution is passed on one side and high temperature weak refrigerant solution is passed on the other side, and heat being exchanged between the strong and the weak refrigerant solutions to heat the strong refrigerant solution prior to the strong refrigerant solution being passed to the heating means and cool the weak refrigerant solution prior to the weak refrigerant solution being returned to the absorber.
Separating means may be provided to separate off the vaporised refrigerant from weak refrigerant solution.
The refrigeration assembly and the power generation assembly may be arranged in parallel so that some refrigerant can be passed to the power generation assembly after vaporisation thereof in the heating means, and the remainder of the refrigerant can be passed to the condenser. In this embodiment, low pressure refrigerant from the power generation assembly is passed to the absorber.
Alternatively, the refrigeration assembly and the power generation assembly may be arranged in series whereby substantially all the refrigerant is passed to the power generation assembly after vaporisation in the heating means. Thereafter, the refrigerant is preferably passed to the condenser.
In another embodiment, apparatus may comprise first and second heating means arranged in parallel, wherein each heating means may comprise a solar collector and, conveniently, a gas burner. Some of the stro
REFERENCES:
patent: 3544084 (1970-12-01), Macrow
patent: 3605436 (1971-09-01), Gammill
patent: 5249436 (1993-10-01), Hemsath
patent: 5303565 (1994-04-01), Pravda
patent: 5345998 (1994-09-01), Itoh
Eames Ian William
Riffat Saffa Bashir
Doerrler William
The University of Nottingham
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