CA1221437A - Method and installation for converting and regulating electric energy to thermal energy - Google Patents

Abstract

The heat released by a static electric heating body is transferred to a heat transfer liquid, and supplies this heating body with electrical energy by means of a semi-conductor static switch. This switch is controlled by an electronic control device as a function of the temperature of the heat transfer liquid measured downstream of the heating body. The installation comprises an enclosure filled with a heat transfer liquid, a pump causing the circulation of this liquid in this enclosure, an electric heating body, a temperature detector capturing the temperature of the heat transfer liquid downstream of said heating body. A static semiconductor switch connected to the electrical supply of the heating body is controlled by an electronic control device controlled by the temperature detector.

Description

~ 2 ~ 3'7 The present invention relates to a procedure ~ statlque electrical energy transformation and regulation in heat energy and installation for its implementation artwork.
In particular, the present invent.ion concerns a process of transformation and static regulation allowing direct heating and more regulation precise temperature of a heat transfer fluid as well that the installation for its implementation.
Existing devices used to heat a heat transfer liquid at a determined temperature required locate a set of complex materials and equipment electromechanical, pneumatic or hydraulic thereby causing yield losses, a premature aging, significant inertia as well than complex maintenance.
The present process tends to obviate the drawbacks cited above.
According to the present invention, there is provided a method energy transformation and regulation statics electric in thermal energy for heating and / or control of the temperature of a liquid or semi-liquid food, characterized by the fact that:
- we transfer the heat given off by a body static electric heating by conduction through of the wall of an enclosure in which the liquid circulates or semi-liquid food, with which it is in mechanical contact;
- this heating body is supplied with electrical energy through a statigua switch semiconductor, and - this switch is controlled by a device electronic control as a function of temperature heat transfer liquid measured downstream of said body heated.
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According to the present invention, there is also provided a static process of transformation and regulation electrical energy into thermal energy for heating and / or control of the temperature of a liquid or semi Food liquids, characterized in that:
- we transfer the heat given off by a body static electric heating by conduction through of the wall. an enclosure, in which the liquid or semi-liquid food, with which it is in mechanical contact;
- this heating body is supplied with electrical energy only through a static switch at semiconductor, and - this switch is controlled by a device electronic control as a function of temperature heat transfer liquid measured directly in the liquid and downstream of said heating body.
According to the present invention, there is also provided a static process of transformation and regulation electrical energy into the energy for heating and / or control of the temperature of a liquid or semi liquid food, characterized in that:
- we transfer the heat given off by a body static electric heating by conduction through of the wall of an enclosure, in which the liquid or semi-liquid food, said heating body being immersed in said enclosure and being in contact direct with the liquid;
- this heating body is supplied with electrical energy through a static semiconductor switch, and - this switch is controlled by a device electronic control as a function of temperature heat transfer liquid measured directly in the liquid and downstream of said heating body by means of a detector of temperature.
According to the present invention, it is also provided an installation for transformation and regulation electrical energy into thermal energy for heating and / or the control of the temperature of a liquid or semi liquid food, comprising:
- an enclosure in which a liquid circulates or semi-liquid food and a pump causing the circulation of this liquid in this enclosure - an electric heating body in contact with the liquid through the enclosure, - a temperature sensor capturing the temperature liquid downstream of said heater;
- a solid-state static switch connected in the electrical supply to the heater, and - an electronic control device for this switch controlled by the signal delivered by said detector temperature.
According to the present invention, there is also provided an installation for transformation and regulation electrical energy into thermal energy for heating and / or control of the temperature of a liquid or semi liquid food, comprising:
- an enclosure in which a liquid circulates or semi-liquid food and a pump causing the circulation of this liquid in this enclosure, - an electric heating body in contact with the liquid through the enclosure, - a temperature sensor immersed in the liquid and sensing the temperature of the downstream liquid said heating body, - a stati ~ eu semiconductor switch connected in the electrical supply to the heater, and - an electronic control device for this ~ ,.
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~ 2 ~ 3'7 pi switch: Lot by signal clélivré by said detec-temperature.
According to the present invention, it is also pr ~ seen an installation for transformation and regulation electrical energy into thermal energy for heating and / or control of the temperature of a liquid or semi liquid food, comprising:
- an enclosure in which a liquid circulates or semi-liquid food and a pump causing the circulation of this liquid in this enclosure, - an electric heater immersed in said pregnant and in direct contact with the liquid, - a temperature sensor immersed in the liquid and sensing the temperature of the downstream liquid said heating body, - a solid state semiconductor switch connected in the electrical supply of the heating body; and an electronic control device ~
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2 ~ L3'7 of this switch controlled by the signal delivered by the-says temperature detector.
The invention also relates to a use particullère de lllnstal] atlon describes heating and 5 the precleared temperature regulation of a llqulde ow seml-llqulde food.
The attached drawing illustrates schematically and as a example two forms of installation for the implementation of the method according to the invention.
Figure 1 illustrates an installation in which the heating element is in direct contact with the liquid coolant, the latter clrculating in a closed circuit Figure 2 illustrates an installation in which the heating element is in indirect contact with the liquid 15 coolant, this circulating in an open circuit.
According to the present process, the heat is transferred released by an electric heater either directly either indirectly through the wall of an enclosure, to a coolant llqulde clrculant in this encelnte.
The energetic power supply of the body heating is carried out using one or more interrup-solid state semiconductors, such as thyristors, controlled by a static electronic device controlled by the signal delivered by a temperature detector me-25 monitoring the temperature of the heat transfer liquid downstream of the heater. The order is obtained by a module continuous pulse through a regu-Electronic reader PID (Proportional Integral Dlfféren-tlel). ~ at temperature is captured directly in the fluid 30 by means of a PT 100 ohm probe or the like.
The thyristors are controlled in alternation packets whole. The thyristors are only triggered on the way at zero of the alternating voltage supplying the elements heaters providing varying power 35 continues from 0 to 100%. This process reduces the L3 ~

maximum temperature difference between the el-men-ts and the heat transfer fluid to heat, which significantly reduces fouling problems and deposits due to possible overheating, lengthening 5 the service life of the heating elements. This also results in Lately a reduction in thermal losses.
This process is particularly interesting since that it not only provides energy but also a very precise regulation of this energy, the 10 temperature of the heat transfer liquid can be set to 0.3 degrees. The main advantage of this process is-lies in the fact that a generator thus produced can be placed in the immediate vicinity of the user station, avoiding thus the losses inherent in the transport of energy, the 15 generator can also be stopped or restarted at the will of the user.
The first form of installation for the implementation of the process described is illustrated in Figure 1. It includes an enclosure 1 whose input 2 20 is connected by a conduit 3 to the outlet of a pump 4.
The output 5 of this enclosure: inte is connected to the input of the primary circuit 6 of a heat exchanger whose outlet tie is connected to the inlet of the pump 4 ~ An expansion tank sion 7 is provided to absorb the variation in volume of the 25 heat transfer liquid 8 filling the enclosure 1 and the circuit 3, 4, 6 ~ Enclosure 1 and the hydraulic circuit are insulated to avoid any loss of energy other than that resulting from the heat exchanger whose the secondary (not shown) is connected to a circuit 30 h hydraulic operation.
A heating body 9 is immersed in the enclosure 1 is in direct contact with the heat transfer liquid 8.
The supply of electrical energy to this heating body is performed by one of the ends of enclosure 1 where 35 the heating body, or its electrical conductors ~: 2 ~ 4L37 pour this enclosure.
The heating body is connected to a source of electrical power 10, for example to the distribution network.
tion by a manual on-off switch 11 and by 5 a static semiconductor switch such as thyristors controlled 12.
The semiconductor switch control is produced by an electronic device comprising a regulator 13 for example of the type existing on the market 10 "Thermel-phonix 96 No 11877" whose output controls the conduction or shutdown of the thyristor (s) via diary of an ignition modulator 14 causing the change thyristor status ment only at zero crossings of the alternating supply current to avoid overvoltage 15 sion.
The regulator 13 is piloted by the output signal of a temperature detector 15 plunging into the current coolant downstream of the heater 9.
The supply of the heating body 9l and therefore its 20 heat production, is controlled directly by the temperature of the heat transfer liquid, very precisely a few tenths of a centigrade degree near and therefore in function of the amount of heat used by the circuit secondary exchanger ~.
In the second form of installation illustrated in Figure 2 / the heater 9 is located around the enclosure 1 in which the liquid flows coolant 8 which in this execution is directly the liquid or semi-liquid use. The body of 30 heater 9 is therefore in contact with this liquid through the medium of enclosure 1 which is made of a good material heat conductor ~ A thermal insulation system. 16 avoids any deposition of heat.
Control of supply of the heating body 35 9 is done as in the first form of execution described '~

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and its elements bear the same reference figures.
This form of execution is part: Lculierement bien suitable for heating, heat treatments ~
pasteurization or sterilization of liquids or semi-5 food liquids.
In all forms of execution, the power electric delivered to the heating body is regulated by everything or nothing and can vary between O and 100% depending on the time of thyristor conduction. This way of doing allows 10 to obtain a high accuracy of the re ~ ulation of the tem-excess heat transfer fluid, avoid overheating of it and have a very short response time ~

Claims (12)

ACHIEVEMENTS OF THE INVENTION, ABOUT WHICH ONE
EXCLUSIVE RIGHT OF OWNERSHIP OR PRIVILEGE IS CLAIMED, ARE DEFINED AS FOLLOWS: 1, Static process of transformation and regulation of electrical energy into thermal energy for heating and / or temperature control of a li-quide or semi-liquid food, characterized by the fact than:
- we transfer the heat given off by a body static electric heating by conduction through the wall of an enclosure, in which the liquid circulates or semi-liquid food, with which it is in con-mechanical tact;
- this heating body is supplied with electrical energy through a static switch at semiconductor, and - this switch is controlled by a device control electronics depending on the temperature of the heat transfer liquid measured downstream of said heating body. 2. Static process of transformation and regulation of electrical energy into thermal energy for the heating and / or controlling the temperature of a liquid or semi-liquid food, characterized by the fact that:
- we transfer the heat given off by a body static electric heating by conduction through of the wall of an enclosure, in which the liquid circulates or semi-liquid food, with which it is in contact mechanical;
- this energy body is supplied with energy electric through a static switch semiconductor, and - this switch is controlled by a device tif electronic control as a function of temperature heat transfer liquid measured directly in the liquid and downstream of said heating body, 3, Static transformation and regulation process lation of electrical energy into thermal energy for the heating and / or controlling the temperature of a liquid or semi-liquid food, characterized in that;
- the heat given off by an electric heating body is transferred static stick by conduction through the wall of an enclosure, in the which circulates the liquid or semi-liquid food, said heating body being immersed in said enclosure and being in direct contact with the liquid, - this heating body is supplied with electrical energy through a static semi-switch driver, and - this switch is controlled by a device control electronics depending on the temperature of the heat transfer liquid measured directly in the liquid and downstream of said heating body by means of a temperature. 4. Static process of transformation and regulation electric energy to thermal energy, characterized by the fact that:
- the heat given off by a body of static electric heating by conduction to a coolant carrier, the heating body being in mechanical contact with said fluid, - this energy body is supplied with energy using a solid-state static switch, - this switch is controlled by a device static electronics controlled by a signal delivered by a temperature sensor measuring the temperature of the fluid coolant downstream of the heating body, this command being obtained by a continuous modulation of the power by through a PID electronic regulator, and - the temperature is captured directly in the heat transfer fluid via a probe. 5. Method according to claim 4, in which;
- said static switch is controlled by whole alternation packets, this switch not being triggered only when the AC voltage reaches zero lying the heating elements providing power continuously varying from 0 to 100%. 6. Installation for processing and regulation of electrical energy into thermal energy for heating and / or controlling the temperature of a liquid or semi-liquid food, comprising:
- an enclosure in which a liquid circulates or semi-liquid food and a pump causing the cir-culation of this liquid in this enclosure;
- an electric heating body in contact with the liquid through the enclosure, - a temperature sensor capturing the temperature ture of the liquid downstream of said heating body;
- a solid-state static switch plugged into the electrical supply to the heater, and - an electronic control device for this switch controlled by the signal delivered by said detector temperature. 7. Installation for processing and regulation of electrical energy into thermal energy for heating and / or controlling the temperature of a liquid of or semi-liquid food, comprising:
- an enclosure in which a liquid circulates or semi-liquid food and a pump causing the cir-culation of this liquid in this enclosure;
- an electric heating body in contact with the liquid through the enclosure;
- a temperature sensor immersed in the liquid and sensing the temperature of the liquid downstream of said heater, - a solid-state static switch plugged into the electrical supply to the heater, and - an electronic control device for this switch controlled by the signal delivered by said detector temperature. 8. Installation for processing and regulation of electrical energy into thermal energy for heating and / or controlling the temperature of a liquid of or semi-liquid food, comprising;
- an enclosure in which a liquid circulates or semi-liquid food and a pump causing the cir-culation of this liquid in this enclosure;
- an electric heater immersed in said enclosure and in direct contact with the liquid;
- a temperature sensor immersed in the liquid and sensing the temperature of the liquid downstream of said heater, - a static semiconductor switch connected in the power supply to the heater, and - an electronic control device for this switch controlled by the signal delivered by said detector temperature. 9. Installation according to claim 6, 7 or 8, characterized in that the heat transfer fluid is a liquid which circulates in a closed circuit under the action of the pump, this circuit comprising at least one heat exchanger with a hydraulic operating circuit. 10. Installation according to claim 6, 7 or 8, characterized by the fact that the heater is located outside the enclosure and by the fact that the circuit hydraulic fluid, which is a liquid, is an open circuit of use. 11. Installation according to claim 6, 7 or 8, characterized by the fact that the electric control device control unit includes a regulator receiving signals from the detector temperature controller and thyristor controller via mediation of an ignition modulator, 12. Installation according to claim 6, 7 or 8, characterized in that the heating body and the enclosure are protected by thermal insulation to avoid any deposition heat.