Power plants – Motor operated by expansion and/or contraction of a unit of... – Unit of mass is a gas which is heated or cooled in one of a...
Patent
1997-01-06
1998-08-18
Kilner, Christopher
Power plants
Motor operated by expansion and/or contraction of a unit of...
Unit of mass is a gas which is heated or cooled in one of a...
60526, 62 6, F01B 2910, F25B 900, F02G 104
Patent
active
057944440
DESCRIPTION:
BRIEF SUMMARY
The invention relates to method for utilizing the heat comprised in the exhaust gas of the combustion chamber of a heating and refrigerating engine working on the basis of a regenerative cyclic gas process by preheating the combustion air supplied to the combustion chamber, with the process gas, which is displaced from the hot working volume or supplied to this working volume, flowing through a regenerator arranged inside of a pressure-proof housing in the region of the hot piston.
Heating and refrigerating engines operating according to a regenerative cyclic gas process, for example, according to the Stirling or Vuilleumier cycle process, have been known for a long time, for example, from the GB Patent 136 195. Such engines have two pistons which are linearly movable in a pressure-proof housing, which pistons together delimit a warm working volume and of which the one piston in the housing delimits a hot working volume acted upon by heat and the other piston delimits a cold working volume, with the three working volumes being connected with one another while regenerators and heat exchangers are connected in line and with a drive and/or a control for the pistons being provided.
In spite of the indisputable advantages of the heating and refrigerating engines operating on the basis of a regenerative cyclic gas process, these have so far not been implemented in practice, mainly because of constructive difficulties which have hitherto prevented the practical realization of the theoretical advantages of such engines.
In order to improve the efficiency of heating and refrigerating engines operating on the basis of a regenerative cyclic gas process it is known to utilize the heat comprised in the exhaust gas of the combustion chamber by preheating the combustion air supplied to the combustion chamber. For this purpose, an additional heat exchanger was arranged in the pressure-proof housing of the engine; furthermore, the housing was provided with extensive insulation elements to protect it from thermal radiation and thermal conduction.
It is the object of the invention to further develop the method of the type described at the outset for utilizing the heat comprised in the exhaust gas of the combustion chamber of a heating and refrigerating engine operating on the basis of a regenerative cyclic gas process such that a preheating of the combustion air is possible without providing an additional volume for a heat exchanger and for insulation elements of the housing in the region of the regenerators and heat exchangers connected to the hot working volume.
The solution of this object provided by the method according to the invention is characterized in that the combustion air to the cooling of the pressure vessel wall surrounding the lower section of the regenerator, which cooling corresponds to the lower section of the temperature profile of the regenerator, is used while the temperature profile necessary for the operation of the regenerator is maintained and that, for maintaining the upper section of the temperature profile necessary for the operation of the regenerator, the exhaust gas flows around the upper section of the pressure vessel wall surrounding the regenerator while, at the same time, heat is extracted from the exhaust gas in this region by means of the combustion air conducted on the outer side of the exhaust gas flow in the reverse direction.
With the method according to the invention, the heat comprised in the exhaust gas of the combustion chamber is utilized in an optimum manner by preheating the combustion air supplied to the combustion chamber without using additional heat exchangers or insulation elements for this heat transfer because the cooling of the regenerator takes place in the lower section of its temperature profile by direct action of the cold combustion air upon the pressure vessel wall surrounding this section of the regenerator. By cooling this section of the pressure vessel wall, heat losses due to heat conduction are prevented at the same time which, without this direct cooling, wo
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Heikrodt Klaus
Hofbauer Peter
Strauss Rolf-Peter
Thomas Bernd
Kilner Christopher
Robert & Bosch GmbH
Viesmann Werke GmbH & Co.
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