JPS6050276B2 - heat exchange equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchange device used, for example, to melt snow accumulated on the roof of a house in a cold region.

Generally, if there is a large amount of snow accumulated on the roof, there is a risk that the house will be crushed, so the snow accumulated on the roof is periodically removed by spraying water or using a scoop manually.

This snow removal work takes a lot of effort and time.
Incidentally, in recent years, various methods have been used to melt and remove snow accumulated on roofs using heat exchange devices. Hereinafter, this type of conventional device will be explained based on FIGS. 1 and 2.

In each of these figures, 1 is a heat medium (1) consisting of hot water (
A pipe line through which hot water (hereinafter referred to as hot water) flows in the direction of arrow A, 2 is a heat transfer header pipe arranged in parallel with the pipe line 1 in the vicinity of the pipe line 1, and 3 is a heat transfer header pipe whose one end 3a is a heat transfer header pipe. The heat transfer tubes are connected to the tube 2, and the other end portion 3b is arranged parallel to the roof (not shown), and a plurality of heat transfer tubes are provided in the longitudinal direction of the heat transfer header tube 2. One end portion 3a of the heat transfer tube 3 is It is in thermal contact with the conduit 1 via the heat transfer header pipe 2 . 4 is a good heat conductor that thermally connects the pipe line 1 and the heat transfer header pipe 2.

The heat transfer header tubes 2 and the heat transfer tubes 3 are filled with a suitable amount of a working fluid for transporting heat, such as water, alcohol, fluorocarbon, or ammonia. Further, a wick (not shown) made of a porous material is attached to the inner peripheral wall of the heat transfer header tube 2 and the heat transfer tube 3. The operation of the conventional heat exchange device configured as described above will be explained.

When snow accumulates on the roof and the ambient temperature around the roof decreases, the temperature of the steam of the working fluid in the heat transfer header tubes 2 and 3 also decreases. When the steam temperature becomes lower than the temperature of the hot water flowing through the pipe line 1, the heat transfer header pipe 2 absorbs the thermal energy in the hot water. The working fluid evaporates due to the thermal energy, and the steam passes through one end 3a of the heat transfer tube 3 and reaches the other end 3b due to the slight vapor pressure difference between the heat transfer header tube 2 and the other end 3b of the heat transfer tube 3. move towards. The steam that has moved to the other end 3b moves to the other end 3b because the temperature of the roof is lower than the temperature of the hot water.
It condenses into liquid and releases the condensation heat to the roof. The liquefied working fluid is transmitted through the inner circumferential wall of the heat transfer tube 3 due to the capillary action of a porous material attached to the inner circumferential wall of the heat transfer tube 3, passes through one end 3a of the heat transfer tube 3, and naturally circulates back into the heat transfer header tube 2. do. As the above operations are repeated naturally, the thermal energy in the hot water is transferred to the roof via the heat transfer header tube 2 and the heat transfer tube 3, the roof is heated, and the snow accumulating on the roof is melted. It's summery. However, in the conventional device described above, the thermal energy of the hot water flowing through the pipe 1 is not uniform in the longitudinal direction of the pipe 1 due to distance problems, so the thermal energy is transferred to the heat transfer header pipe 2, the heat transfer pipe Even if heat was transported to the roof by the heat exchanger tubes 3, the heat transport efficiency was unbalanced in each heat transfer tube 3.

Therefore, the melting state of the snow accumulated on the roof becomes unbalanced,
Stable. It was not possible to melt the snow from the roof. This invention was made in view of the above-mentioned drawbacks of the conventional heat exchanger tubes, and includes a temperature detector provided near one end of at least two heat exchanger tubes to detect the temperature of each of the plurality of heat exchanger tubes. , these temperatures. The temperature detection value is compared by a comparator, and when the comparison value reaches a predetermined value, a signal is output that commands a change in the flow direction of the heat medium flowing in the pipe, thereby stabilizing the heat. The present invention provides a heat exchange device that can perform an exchange operation. An embodiment of the present invention will be described below with reference to FIG.

In the figure, 1 is a pipe, 2 is a heat transfer header tube, 3 is a heat transfer tube, 3a and 3b are one end and the other end of the heat transfer tube 3, and 5 and 6 are, for example, both longitudinal ends of the heat transfer header tube 2. Temperature detectors 7 are provided near one end 3a of the side heat exchanger tube 3, that is, on the lower surface of the heat exchanger header tube 2, and detect the respective temperatures. Reference numeral 7 indicates detection values 11 and 12 of these temperature detectors 5 and 6. Compare the
When the comparison values reach predetermined values P1 and P2, pipe line 1
A signal Sl instructing a change in the direction of flow of hot water flowing through the
, S2. The operation of the heat exchange device according to the present invention configured as described above will be explained.

First, when hot water is flowing in the direction of arrow "A", the relationship between the detected values of temperature detectors 5 and 6 is 11>12. Those detected values 11 and 12 are compared by comparator 7. When the comparison value becomes 11-12=P1, a signal S, which changes the flow direction of hot water from the direction of arrow A to the direction of arrow B, is sent.
Output. On the other hand, when hot water is flowing in the direction of arrow B, the relationship between the detected values of temperature detectors 5 and 6 is 11<12
becomes. Those detected values 11 and 12 are compared by the comparator 7, and when the comparison value becomes 11-12=P2,
A signal S2 is output that changes the hot water flow direction from the direction of arrow B to the direction of arrow A. By repeating the above operations, the thermal energy of the hot water is made substantially uniform in the longitudinal direction of the heat transfer header tube 2 without becoming unbalanced as in the conventional case, and acts on the heat transfer header tube 2.

Therefore, since the heat transport efficiency of each heat transfer tube 3 is made substantially uniform, the melting state of the snow accumulated on the roof is also made substantially uniform, and stable snow melting of the roof can be performed. In the above embodiment, a case was described in which the heat transfer header pipe 2 was arranged outside the pipe line 1 and in parallel with the pipe line 1, but the heat transfer header pipe 2 was arranged inside the pipe line 1, Temperature detectors 5 and 6 may be provided on the lower surface of the conduit 1.

Further, in the above embodiment, a case has been described in which one end portion 3a of the heat transfer tube 3 is connected to the heat transfer header tube 2, but the heat transfer header tube 2 is omitted and the one end portion 3a of the heat transfer tube 3 is directly connected to the pipe line 1. Temperature detectors 5 and 6 may be provided on the lower surface of the conduit 1.

Furthermore, the temperature detectors 5 and 6 may be provided at one end 3a of the heat exchanger tube 3. Further, in the above embodiment, a wick made of a porous material is attached to the inner peripheral wall of the heat transfer header tube 2 and the heat transfer tube 3, and the working fluid is sealed in the heat transfer header tube 2 and the heat transfer tube 3 due to the capillary action of the wick. In the above case, the heat exchanger tube 2 and the heat exchanger tube 3 are made to have one end 3a slightly lower than the other end 3b of the heat exchanger tube 3, and the heat transfer is carried out by the gravity action of the working fluid. The working fluid sealed in the heat header tube 2 and the heat transfer tube 3 may be allowed to circulate naturally.

By the way, in the above embodiments, the case where it is applied to snow melting on roofs is described, but it can also be applied to prevent snow melting, freezing, and icicles on building rooftops, parking lots, viaducts, bridge road surfaces, bridge subterranean areas, roads, etc. Can be done. Furthermore, as an application for heating and cooling equipment, the other end 3b of the heat transfer tube 3 is installed on the floor, ceiling, wall, etc. of a building or house, and hot water or cold water is circulated within the pipe line 1, thereby providing heating and cooling in winter. It is possible to cool the room during the summer. As explained above, this invention provides temperature detectors near one end of at least two of the plurality of heat exchanger tubes to detect the respective temperatures, and compares the detected values of these temperature detectors with a comparator. When the comparison value reaches a predetermined value, a signal is output that commands a change in the flow direction of the heat medium flowing in the pipe 1, so that stable heat exchange operation can be achieved. Obtainable.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional heat exchanger, and Figure 2 is a perspective view of a conventional heat exchanger.
FIG. 3 is a cross-sectional view taken along the line ■-■ in the figure, and a perspective view showing a heat exchange device according to an embodiment of the present invention. In the figure, 1 is a pipe, 3 is a heat exchanger tube, 5 and 6 are temperature detectors, and 7 is a comparator.

Claims (1)

[Scope of Claims] 1 A pipe through which a heat medium flows, one end of which is in thermal contact with the pipe, the other end of which is disposed in a heated or cooled part, a plurality of heat exchanger tubes provided in the direction; a temperature detector provided near one end of at least two of the heat exchanger tubes to detect the temperature of each;
A heat exchange device comprising a comparator that compares the detection values of these temperature detectors and outputs a signal instructing a change in the flow direction of the heat medium when the comparison value reaches a predetermined value. 2. The heat exchange device according to claim 1, wherein one end of the heat transfer tube is communicated with a heat transfer header tube and is in thermal contact with the pipeline via the heat transfer header tube. 3. The heat exchange device according to claim 2, wherein the heat transfer header pipe is disposed within the conduit. 4. The heat exchange device according to claim 1, wherein one end of the heat exchanger tube is disposed within the pipe line. 5. The heat exchange device according to any one of claims 1 to 4, wherein the temperature detector is provided near one end of the heat exchanger tube on both ends of the pipe in the longitudinal direction. 6. The heat exchange device according to claim 2 or 5, wherein the temperature detector is provided on the lower surface of the heat transfer header tube. 7. The heat exchange device according to any one of claims 1 to 5, wherein the temperature detector is provided on the lower surface of the pipe.