Heat exchange – Intermediate fluent heat exchange material receiving and... – Reversible chemical reaction
Patent
1993-10-07
1995-08-29
Rivell, John
Heat exchange
Intermediate fluent heat exchange material receiving and...
Reversible chemical reaction
62480, 62478, F28D 1500
Patent
active
054452171
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION
The present invention relates to a device for producing cold and/or heat by solid-gas reaction.
The device to which the invention refers is based on the use of the so-called "thermochemical pump" system, whose main characteristics are as follows:
- heat energy is employed for operating the system itself; electrical energy is optionally employed only for circulating the heat-transfer fluids,
- the "chemical engine" employed is a reversible reaction between a solid and a gas of the type: ##STR1##
The reaction is exothermic in direction 1, which means that, in this direction, it produces heat, and endothermic in direction 2, that is to say that, in this direction, it produces cold.
Such a system makes it possible to store energy in chemical form and has varied fields of application.
In addition, such a system makes it possible to produce, from a source of heat at the temperature Ts, heat at the temperature Tu such that:
In this case, this system is called "chemical heat pump".
Such a system also makes it possible to produce, from a source of heat at the temperature T's, heat at the temperature T'u such that:
In this case, the system is called "chemical thermoconverter".
By virtue of this system it is possible to produce refrigeration energy from a source of heat and simultaneously to produce, from a source of heat at the temperature T"s, heat at the temperature T"u (T"u<T"s) and refrigeration energy.
Depending on circumstances, the use of the heat or of the cold produced is simultaneous with the consumption of energy at high temperature (Ts, T's, T"s) or delayed in time (storage effect).
Document EP-A-0,382,586 discloses a device for the production of cold and/or heat by solid-gas reaction, comprising two reactors, each containing a salt capable of reacting chemically with a gas, a condenser and an evaporator for the gas. The components of the device are arranged so as to allow the gas to follow a path from one reactor to the other, passing through the condenser and the evaporator. At the end of the chemical reaction the reactor which is depleted in gas is at a higher temperature than that of the reactor containing the gas which has just reacted with the salt, the two reactors being at different pressure levels. Heat is conveyed by a heat transfer system from the reactor which is at the higher temperature to the reactor which is at the lower temperature in order to increase the temperature of the latter. The chemical reaction then takes place in the reverse direction, part of the heat of one reactor being used as a source of heat for desorption of the gas from the other reactor. This heat transfer between the two reactors is used to improve the efficiency of the system.
However, this improved efficiency of the system does not completely satisfy the commercial requirements demanded in the case of such a system.
SUMMARY OF THE INVENTION
The objective of the present invention is therefore to propose a device for the production of cold and/or heat by solid-gas reaction, in which the heat transfer between the various reaction chambers of the device is optimized.
To do this, the invention proposes a device for producing cold and/or heat by chemical reaction comprising at least four reactors, each containing a salt capable of reacting chemically with a gas, a vessel intended to receive the gas from the reactors and a vessel intended to deliver the gas to the reactors, the device being arranged so that, during the chemical reaction, two reactors are at the same higher pressure level and two reactors are at the same lower pressure level, characterized in that the device additionally comprises a heat transfer fluid circuit intended to transfer heat between the reactors which are at the same pressure level.
The advantages and the operation of the present invention will appear more clearly on reading the following description, given without any limitation being applied, with reference to the attached drawings,
BRIEF DESCRIPTION OF THE FIGURES OF DRA
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Castaing Jean
Neveu Pierre
Atkinson Christopher
Rivell John
Societe Nationale Elf Aquitaine
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