Heat pipe filling quality control method

FIELD: heating systems.

SUBSTANCE: control method of heat pipe filling quality involves heat supply to one of its sections and measurement of temperatures at two points on opposite ends of heat pipe on both sides from heat supply zone. Temperatures are measured at heat pipe points at several heat flux values in the range of zero to maximum operating value. Then curve of difference of measured temperatures of heat flux value is built, and as per this curve, the conclusion is drawn whether there is non-condensed gas in heat pipe or not.

EFFECT: improving sensitivity and accuracy of quality control of heat pipe filled with heat carrier.

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The present invention relates to heat engineering, and in particular to methods of testing heat pipes on the performance.

Known methods of quality control charging of the heat pipe [1-4], which consists in applying heat to one of her plots, measuring the temperature at one or two points and comparing the measurement results with the data obtained by calculation or by reference heat pipe.

So by way of quality control charging of the heat pipe [1] (USSR author's certificate No. 1000726, the priority date of 11.06.1981 g) carry out thermal effect on one part of the heat pipe, measure the temperature at the other site in the transient regime and judge the presence of gas in the pipe on the rate of change of temperature, which is compared with the speed of temperature changes on the reference heat pipe.

Another known method of quality control charging of the heat pipe [2] (USSR author's certificate No. 1562659, the priority date of 10.06.1988 g) carry out thermal effect on one of her plots, measure the temperature at the other site and judge the presence of gas in the pipe at the time specified deflection temperature, which is compared to the same time the temperature variation on the reference heat pipe.

The disadvantage of the methods of quality control refills [1, 2] is the low sensitivity is lnost. Assessment of the availability of the heat pipe non-condensable gas largely depends on the identity of the test conditions reference and test heat pipes. Such conditions include in particular the temperature and velocity of the cooling air. The identity of all necessary conditions to ensure it is difficult and requires expensive equipment.

In addition, methods of quality control refills [1, 2] in some cases may not be applicable. For example, the temperature of the heating zone high efficiency heat pipe at the same heat flux, temperature and velocity of the cooling air depends on the amount of non-condensable gases present in it. Decreasing the amount of non-condensable gases in the heat pipe, the temperature in the heating zone may be reduced by (10 to 20)°C., Respectively, decreases and the temperature in the condensation zone. For this reason, quality control charging of the heat pipe temperature, measured at a single point, as is done with the methods [1, 2], can lead to erroneous results.

Another way of quality control charging of the heat pipe [3] (USSR author's certificate No. 1737247, the priority date of 17.03.1989,), is a method consisting in measuring the temperature at the same time in the two boundary points of its plot condensation and defined and the control parameter, equal to the ratio of the difference between the measured temperatures to most of them. The obtained control parameter, as in the methods [1, 2], compared with the same control parameter reference heat pipe.

In comparison with the methods [1, 2] the sensitivity of the method [3] above, but it also greatly decreases with the decrease in the number of non-condensable gases in a heat pipe.

The closest in technical essence and, therefore, selected as a prototype is a method of quality control heat pipe [4] (USSR author's certificate No. 1326869, the priority date of 28.01.1986, by applying heat to one of her plots, measuring the temperature at two points on opposite ends of the heat pipe on opposite sides of the zone of heat supply, determination of the difference between the measured temperatures (Δt) and the comparison value (Δt) with the results obtained on the reference heat pipe.

This method of quality control charging of the heat pipe is the most sensitive of all the considered methods. However, in some modes of operation of a heat pipe (heat flux (P), the temperature of the heat pipe, etc.), the sensitivity may be reduced, i.e. the value of Δt can practically do not depend (or depends very slightly) from the presence of the heat pipe non-condensable gas. This is due to the eat, in particular, from the above modes of operation of a heat pipe depends on the degree of penetration into the flow of steam non-condensable gas due to diffusion. While you may receive inaccurate results.

All of the above known methods of quality control heat pipe [1-4], also have a common drawback - the need to compare the measurement results with the results obtained by calculation or experimentally on the reference heat pipe. However, to make a sufficiently accurate calculation of the heat pipe is difficult. It is also unclear what the heat pipe can be taken for reference.

The objective of the proposed technical solution is to increase the sensitivity and reliability of quality control charging of the heat pipe cooled and thereby increase the output of quality products.

This problem is solved due to the fact that in the known method of quality control heat pipe [4], including application of heat to one of her plots, measuring the temperature of the pipe at two points on opposite ends on opposite sides of the heat supply zone and determining the difference between the measured temperatures (Δt), in accordance with the proposed technical solution, the temperature difference Δt is determined at several values of the heat flux in the range from zero to maximum working znacheniya measurements build the dependence of the temperature difference Δt from the magnitude of the heat flux R. The nature of this dependence makes the conclusion about the presence or absence of heat-pipes non-condensable gas.

Experimentally it was found that when the non-condensable gas in the heat pipe is missing, the value of Δt increases monotonically with increasing heat flux R. in the presence of a heat pipe, a certain amount of non-condensable gas dependence of Δt(P) has a local maximum.

As an example, the particular application of the proposed technical solution is the method of controlling the quality of water feeding the flat heat pipe of Nickel having a size (140×110×2) mm

This flat heat pipe (the same) refueled and were controlled twice. In the first case, the quality of filling was high non-condensable gas in it was practically absent; in the second case, the heat pipe remained non-condensable gas in quantities that affect its performance.

Using the heater to the evaporation zone of the heat pipe brought the heat flux with a power of 2.5 W and measured the temperature difference between the evaporating and condensing zones. This procedure was repeated when the capacity of the heat flux of 5.2 W 10.4 W ... 79,8 watts. The results are shown in the table below.

PnakedWΔtCOI-o, °C
while there are some some. gasin the practical absence of some. gas
0,00,0-
2,51,3-0,02
5,23,1-0,1
10,45,80,4
20,47,20,6
to 25.37,20,8
29,97,11,1
40,26,21,5
50,05,01,8
70,03,32,1
79,83,12,4

Measurements were constructed according to the t(P) (see the drawing). When non-condensable gas in the heat pipe is virtually absent, was obtained dependence 2, in the presence of a heat pipe, a certain amount of non-condensable gas - dependence 1.

As shown at P=80 watts or more, the parameter Δt practically does not depend on small amounts of non-condensable gases. However, the decrease in heat flux sensitivity of this parameter increases, reaching a maximum at P=(20-30) W.

If a heat pipe is a certain amount of non-condensable gases, while small value of heat flow the temperature difference between the evaporation zone and the condensation may substantially exceed the corresponding values at higher heat fluxes and potential heat pipe is used incompletely. Heat pipe with an extremely low content of non-condensable gases can operate in the entire operating range of heat fluxes with a small value of the temperature difference between the zones of evaporation and condensation.

Application of the proposed method quality control charging of the heat pipe allows to increase the sensitivity of the determination of the presence of non-condensable gases and thereby improve the quality of the produced heat pipes.

SOURCES of INFORMATION

1. The author is vegetalismo of the USSR №1000726, CL F28D 15/00, the priority date of 11.06.1981,

2. USSR author's certificate No. 1562659, CL F28D 15/02, the priority date of 10 06.1988,

3. USSR author's certificate No. 1737247, CL F28D 15/02, the priority date of 17.03.1989,

4. USSR author's certificate No. 1326869, CL F28D 15/02, the priority date of 28.01.1986,

Method of quality control charging of the heat pipe by heat to one of her plots, measuring the temperature at two points on opposite ends of the heat pipe on opposite sides of the heat supply zone, characterized in that the measurement of the temperatures at the points a heat pipe is produced at several values of the heat flux in the range from zero up to the maximum operating value, and then build the dependence of the difference of the measured temperatures from the magnitude of the heat flow, the nature of which make the conclusion about the presence or absence of heat-pipes non-condensable gas.



 

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