Method of transferring heat energy from a low to a higher temper

Details Method of transferring heat energy from a low to a higher temper Method of transferring heat energy from a low to a higher temper

1992-12-17

1994-10-04

Davis, Jr., Albert W.

Refrigeration

Processes

Employing diverse materials or particular material in...

62268, 62270, 62402, 62513, 126247, F24J 300

Patent

active

053515013

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a method of transferring heat energy from a low to a higher temperature, by which method a main medium in gas form after a possible pressure reduction and possible normal heat absorption in a heat exchanger is conducted to a first heating chamber where heat at low temperature is added, after which the gas is compressed in a compressor.
The characteristic feature of the method according to the invention is that the main medium is rendered extra rich in energy by an extra exchange of heat which occurs prior to the compressor, where there is added an auxiliary medium in liquid form which evaporates simultaneously with the heating of the main medium, so that after heating the main medium is more or less saturated with the auxiliary medium in vapour form.
The process can be regulated by the addition of throttling or expansion, and therewith a reduction in the pressure of the main medium before it is conducted to the heating chamber. The result achieved hereby is that the main medium will be able to contain more auxiliary medium, and that the pressure after the subsequent compression will be able to be lower than would otherwise be the case.
It is well-known to produce cold cooler-water/ice-water by moisturizing the air in an evaporator with vapour from the cooling water, after which the mixture is compressed, cooled to the surroundings and expanded back to the evaporator.
In the new process, there is here inserted a special heat exchanger where the moist air from the evaporator is heated and provided with a liquid auxiliary medium which evaporates before the air is conducted to the suction side of the compressor.
The energy for the special heat exchanger is obtained, for example, by the cooling and condensation of the main medium after the normal cooling, but before a possible throttling, expansion or other use.
It is well-known to be advantageous for the cooling and condensation of the compressed main medium to be carried out before the expansion, for example in a turbine, in that this reduces the possibility of damage to the expansion turbine. This cooling is seen carried out via heat exchange with the cold, expanding main medium, but never via heat exchange with the main medium before compression and never during the introduction and evaporation of an auxiliary medium.
It is known to carry out a corresponding heat pump process on a medium in gas form alone, but with the use of an auxiliary medium such as, for example, water, some important advantages are achieved. When a medium in gas form is used alone, quite large amounts of gas must be circulated because the heat capacity of a gas is small and, moreover, quite large heat transfer surfaces must be used because the heat transfer coefficients for gases are low. By utilizing an auxiliary medium, the main medium can contain considerably larger amounts of heat, while at the same time, when the auxiliary medium is for example water, the heat transfer coefficient becomes many times higher because the auxiliary medium exists in liquid form. Thus the costs of the heat exchangers can be considerably reduced, and the process has a higher degree of efficiency.
The method is particularly advantageous as a heat pump/refrigerator in connection with processes which nevertheless employ the compression of a gas. It is possible here, possibly with a modest increase in the compression work, to achieve a heat pump effect. The heat pumps which are used today are normally of the type which are based on CFC cooling agents. They have a high degree of efficiency, but at the same time also some disadvantages. Among other things, the disadvantages include the demand for a hermetically sealed construction, and environmental problems in relation to the ozone layer in the atmosphere. The present invention, on the other hand, can be an open construction without any environmental problems.
The method can be used in connection with the production of cold compressed air or gas/air mixture for the pressurecharging/turbocharging of engines.
An ordinary turbocharging r

REFERENCES:
patent: 4707996 (1987-11-01), Vobach

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