JPS5853298B2 - Heat pipe transport calorific value measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for directly measuring the amount of heat transported by a heat pipe.

The method of measuring the amount of heat transferred from the heat absorption part of a heat pipe type cooling device to the heat exchanger is: ■ Calculate the amount of heat transferred from the difference between the inlet temperature and outlet temperature of the cooling medium (water or cold air) of the heat exchanger. Method, ■Method of calculating the amount of transported heat from the temperature difference between the object to be cooled and the heat pipe and their mutual thermal resistance,■
There are methods for estimating the amount of heat transported from heat flow measurements in the heat absorption part, but since all of these methods are indirect measurement methods, the accuracy varies and is unreliable. If there is no directional distribution, approximately accurate results can be obtained, but it is more accurate when the mutual thermal resistance is unknown or heat measurement is difficult, or when there is a distribution in the amount of heat absorbed and you want to know the total amount of heat transported. It is impossible to calculate the exact amount of heat.

The present invention was conceived in view of this point, and an embodiment thereof will be described below with reference to the drawings. In the drawing, 1 is a heat pipe installed in a heat absorption source such as a cable line, and 2 is a working medium in the heat pipe. A heat exchanger for cooling and dissipating heat; 3 is a transport calorific value measuring device installed between the heat pipe 1 and the heat exchanger 2; as shown in FIG. An operating bundle 33 is provided in the middle of the connecting pipe 4 for causing the working medium released into the liquid phase to flow back into the heat pipe 1, or is airtightly attached to the reservoir in the server 31 with an O-ring 36 and a holding fitting 37. A weighing cup 32 that can be operated from the outside via a measuring cup 32 and a lighting bulb 34 connected to a power source are provided, and the connecting tube 4 is provided with a bend as shown in the figure or is attached with the tube end protruding into the reservoir 31. The entire amount of the liquid phase flowing down is configured to enter the measuring cup 32 by such a method, and the amount of liquid phase accumulated in the measuring cup can be observed from the outside through a side glass 35 attached to the scale reservoir 31. It has become.

Now, while observing the inside of the reservoir through this side glass 35, turn the operating bundle 33 to empty the liquid phase in the weighing cup 32, and then raise the weighing cup 32 to the normal position at the same time as pressing the stopwatch button. , the time Δt sec required for the cup to be filled with the flowing liquid phase α is measured, and the amount of heat transport is calculated from this measured value.

In other words, the flow rate when the working medium in the heat pipe 1 that has taken heat from the heat absorption source becomes a gas phase, releases heat and condenses in the heat exchanger 2, and flows back into the heat pipe is proportional to the amount of heat released - the amount of heat absorbed. The heat transport amount Q (KW) from the heat pipe 1 and the time △tsee required for the cup 32 to be filled with the liquid phase medium flowing down through heat dissipation and condensation are as follows: V: Weighing cup volume σ: Working liquid latent heat of vaporization ρ: There is a relationship between the working liquid density and the amount of heat transport can be easily calculated from this relational expression.

Next, the present invention will be explained in detail.

A 75 m long heat pipe 1 filled with Freon 11 was installed in the air inside the cable tunnel, and the inside of the tunnel was set to V = 2 r.
Ventilated at rt/sec, installed at the bottom of the cooling tower type heat exchanger 2 installed on the ground, or installed in the server 31 with 30X
A measuring cup 32 of 30 x 70 mm is provided, and the time required for the measuring cup to be filled with the refluxing liquid phase medium α is measured 10 times, and from the average value of 25 SeC, the amount of transferred heat Q is: V: 63 cIrl σ: 43 cal/g From ρ: 1.476 g/c11t, it was 6.7 KW, and an accurate measurement result was obtained.

According to the present invention, as described above, a device for measuring the flow rate of the working medium flowing back from the heat radiating part to the heat absorbing part is provided in the middle of the connecting pipe connecting the heat radiating part and the heat absorbing part of the heat pipe. The amount of heat transported by a heat pipe can be easily and accurately measured with a simple operation.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and FIG. 2 is an enlarged explanatory diagram of the main part. 1...Heat pipe, 2...Heat exchanger, 3...Transportation calorific value measuring device, 4...Connecting pipe.

Claims (1)

[Claims] 1 A measuring cup that measures the flow rate of the working medium flowing back from the heat radiating part to the heat absorbing part is provided in a reservoir having a see-through window provided in the middle of a connecting pipe connecting the heat radiating part and the heat absorbing part of the heat pipe, and can be operated from the outside. A heat pipe transport calorific value measuring device characterized by