SU1179296A1 - Device for periodic heating and cooling of object - Google Patents

Abstract

A DEVICE FOR PERIODRISE HEATING AND COOLING OF THE OBJECT containing a thermopile, one of the working surfaces of which is installed in contact with the object on which the temperature sensor is connected to the input of the control unit connected by the outputs to the control inputs of the switching unit whose inputs are connected to the source power supply, and the outputs to the poles of the thermopile, and the heat exchanger, due to the fact that, in order to simplify the device and increase its efficiency, it contains a heat accumulator nny between the heat exchanger and the second working surface and the thermopile formed in a two-phase filler filled cavities vypol nenngh the heat capacity basis.

Description

1 1 The invention relates to the field of thermoelectric converters operating in periodic reverse thermal conditions and providing alternate cooling and heating of objects. The purpose of the invention is to simplify the device and increase its efficiency. Fig „1 is a schematic representation of a device with a block diagram; Fig. 2 is a block diagram of a control unit. The device includes a thermoblock 1, the poles of which are connected to the outputs of the switching unit 2, the inputs of which are connected to the power source 3. Control (and the inputs of the switching unit 2 are connected to the outputs of the control unit 4, the input of which is connected to the temperature sensor 5 installed at facility 6, mounted with a reliable thermal contact on one of the working surfaces 7 of the thermopile 1. On the second working surface 8, a heat exchanger 9 is mounted in the form of a flat ribe radiator system, in which a heat-intensive base 10 is created A heat accumulator in the form of cavities 11 filled with heat-accumulating filler 12 with a melting point that determines the operating temperature of the heat accumulator. Object-6 is protected from the external environment by a layer of thermal insulation 13. The block diagram of one of the embodiments of the control unit is shown in Fig. 2 4 includes a two-level comparator 14, the input of which is connected to the temperature sensor 5, and the outputs to the inputs of the trigger 15. The outputs of the trigger 15 are connected to the control inputs of the switching unit 2. The device operates yuschim manner. When the device is initially switched on to the power supply circuit, the switching unit 2 in accordance with the signal supplied to its control inputs from the output of the control unit 4, ensures the polarity of the voltage supplied to the thermopile 1 from the power source 3, which removes heat from one of the workers surfaces 7 and causing cooling of the object 6. On the other working surface 8, 62 heat is generated, which is partially absorbed in the heat accumulator 11, during the melting process of the filler 12 into the latent heat The heat exchanger 9 is partially removed from the environment. The control signal, determined by the temperature of sensor 5, is fed to the input of a two-level comparator 14, which is compared with two reference voltage values corresponding to two amplitude values of the object temperature 6. When The temperature of the object 6 reaches the minimum value of i. The signal that goes out at the comparator T4 causes an abrupt transition of the trigger 15 from one equilibrium state to another. This causes the transfer of the switching unit 2 from one positional state to another, a change in the polarity of the voltage supplied to the thermopile 1, which begins to heat the object 6 from the minimum to the maximum temperature. In this half period, part of the heat from the heat exchanger 9 is removed by the thermopile 1 and, transformed on the working surface 7 into the heating heat of the object 6, is returned back to the heat cycle. Another part of the heat is removed by the radiator system 9 to the external environment. When the maximum temperature is reached by the signal of the comparator 14, first the trigger 15, and then the switching unit 2, go to the new states. At the same time, the polarity of the voltage supplied to the thermopile 1 is again changed, and the cooling of the object 6 to the minimum temperature again begins. Subsequent cycles of operation of the proposed device are similar and periodically repeated. As the calculations show, for the range of extreme values of temperatures provided by thermoelectric. By means of a converter, one can always find such a temperature, which determines the choice of filler 12, at which the average heat quantities of different directions over a period, brought to the object 6, are equal. For this case, the relationship of the operating temperature of the heat

311

the battery 11 with the amplitude values of the temperature of the object 6 is determined by the dependence

 T, (i.f, (z, T, .Tj) (t4f (,, T.Tj), -, (

2 (2d,. T;) 4 ((tgTo1;

m

M-1

.5z (T, fT);

 Z is the quality factor of the thermopile, T., T and T are respectively the operating temperature of the heat accumulator 11, the lower and upper amplitude values of the temperature of the object 6 in the established periodic thermal process, K.

964

The efficiency of the proposed device is due, firstly, to the return of part of the heat back into the cycle with a high conversion rate; secondly, there is no need to cyclically remove part of the heat from the object 6 when heated; as a result, there is no need to use additional energy-consuming units to create cyclical heat exchange with the external environment,

 Proposed Device for Creating a Periodic Process

reversible thermal effects, characterized by simplicity of thermal circuit, can be widely used in various thermal systems — thermal presses, thermal compressors and pumps, medical devices for contrasting temperature effects, etc.

Fig 2

Claims (1)

DEVICE FOR PERIODIC HEATING AND COOLING OF THE OBJECT, containing a thermal battery, one of the working surfaces of which is installed in contact with the object on which the temperature sensor is connected, connected to the input of the control unit, connected by the outputs to the control inputs of the switching unit, the inputs of which are connected to the source power supply, and the outputs - to the poles of the thermal battery, and a heat exchanger, characterized in that, in order to simplify the device and increase its efficiency, it contains a heat accumulator installed row heat exchanger and the second working surface and the thermopile formed in a two-phase filler filled cavities formed in the heat capacity basis. Figure 1 I * "o * (mA y de>