JPH0731047Y2 - Snow melting equipment - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to a snow melting apparatus used for melting snow on a roof or the like.

(B) Conventional Technology Conventionally, a snow melting device of this type is known to supply hot water from a heat source device to a snow melting panel installed on a roof or the like, as disclosed in Japanese Utility Model Laid-Open No. 62-85617. Has been. This is very uneconomical because the hot water supplied to the snow melting panel is drained as it is. In addition, in recent years, a method of circulating hot water of the heat source device to the snow melting panel has been attempted, but with this, the heat output of the heat source device is controlled to be turned on and off, and moreover, the flow rate of the heat source device tends to change depending on the pipe length Therefore, there is a drawback that the temperature of the hot water supplied to the snow melting panel becomes unstable, the heat radiation loss increases, and the heat exchange efficiency decreases.

(C) Problems to be solved by the invention This invention was made in view of the above-mentioned facts,
Stabilize the temperature of the heat medium supplied to the snow melting panel,
The purpose is to improve heat exchange efficiency.

(D) Means for Solving the Problems In the present invention, a heat source having a heat output variable type heat source and a heat source machine having a heat exchanger heated by the heat source and a snow melting panel are provided, and a heat exchanger and a snow melting panel are provided. Is connected in an annular shape by a pipe having a circulation pump, and a bypass pipe having a flow rate adjusting valve is connected in parallel with the heat exchanger, and the heat medium heated by the heat exchanger and the low-temperature heat medium from the bypass pipe are connected. It has a temperature sensor that detects the temperature of the heat medium in the pipe that guides the combined heat medium to the snow melting panel, and a controller that proportionally controls the heat output of the heat source so that the detected value of this sensor becomes a target value. It is a composition.

(E) Operation With this configuration, the flow rate adjustment valve adjusts the bypass flow rate so that the heat exchanger flow rate of the heat source unit becomes substantially constant regardless of the pipe length, and the temperature of the heat medium in the heat exchanger is adjusted accurately. Done Also, the output of the heat source is proportionally controlled so that the temperature of the heat medium in the pipe that guides the heat medium obtained by merging the heat medium heated by the heat exchanger and the low-temperature heat medium from the bypass pipe to the snow melting panel reaches the target value. Since the heat exchanger flow rate is almost constant, the temperature of the heat medium supplied to the snow melting panel can be accurately adjusted to a relatively low target temperature suitable for snow melting regardless of changes in the outside temperature. The forward temperature and the return temperature of the heat medium are kept substantially constant. Therefore, the heat medium at an appropriate temperature continuously flows, heat dissipation loss is suppressed as much as possible, heat exchange efficiency is improved, and stable snow melting operation is performed.

(F) Embodiment Hereinafter, an embodiment of the present invention shown in the drawings will be described.

In FIG. 1, (1) is a heat source (2) such as a heat output variable burner, and a heat source machine having a heat exchanger (3) heated by this heat source (2), and (4) is a roof or the like. Is a snow melting panel having a meandering hot water channel, and the heat exchanger (3) and the snow melting panel (4) are connected by a return pipe (6) having a circulation pump (5) and a forward pipe (7). It is connected in a ring. Reference numeral (8) is a bypass pipe that connects both pipes (6) and (7) in the vicinity of the heat exchanger (3) in parallel with the heat exchanger (3), and is a manual flow rate adjusting valve (9). Has been inserted. (10) is a temperature sensor for detecting the hot water temperature of the outgoing pipe (7) where the hot water (heat medium) flowing out from the heat exchanger (3) and the bypass pipe (8) joins, and (11) is the temperature sensor (10). Is a controller that proportionally controls the heat output of the heat source (2) so that the temperature difference between the detected temperature and the target temperature (for example, 40 ° C.) becomes small (see FIG. 2). The flow rate adjusting valve (9) is, for example, if the circulation flow rate of the circulation pump (5) is 30 l / min, the flow rate of the heat exchanger (3) is 10 l / min, and the bypass pipe (8).
The flow rate is adjusted manually to 20 l / min.

The hot water of the heat exchanger (3) heated by the heat source (2) merges with the hot water of the bypass pipe (8), is mixed, and then goes to the snow melting panel (4) through the outgoing pipe (7). The snow melting panel (4) melts snow, and the warm water whose temperature has dropped is partially returned to the heat exchanger (3) through the return pipe (6) and the rest is diverted to the bypass pipe (8). Thus, the heat output of the heat source (2) is proportionally controlled so that a substantially constant amount of hot water flows through the heat exchanger (3) and the temperature detected by the temperature sensor (10) reaches the target temperature. Therefore, the temperature of the hot water supplied to the snow melting panel (4) through the outgoing pipe (7) is maintained at a substantially target temperature, and stable snow melting operation can be performed. Moreover, while continuously operating the heat source (2), the hot water temperature of the outgoing pipe (7) can be maintained at about 40 ° C and the hot water temperature of the return pipe (6) at about 30 ° C, and the heat source device (1) is effective. In addition to being utilized for, it is possible to continuously flow hot water at an appropriate temperature to reduce heat loss and improve heat exchange efficiency, which also contributes to energy saving.

FIG. 3 shows another embodiment of the present invention.
In the figure, the same parts as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, a heat pipe (14) including an evaporation part (12) and a condensation part (13) is installed in the snow melting panel (4), and hot water is supplied to the evaporation part (12) of the heat pipe (14). It is supplied and the working fluid is evaporated. Evaporator (12)
Since the temperature of the hot water supplied to is substantially constant, the working fluid performs stable heat exchange.

(G) Effect of the device Since the device of the present invention is configured as described above, by adjusting the bypass flow rate by the flow rate adjusting valve, the heat exchanger flow rate of the heat source machine becomes substantially constant regardless of the pipe length, and heat exchange is performed. The temperature of the heat medium in the heat exchanger can be adjusted accurately, and the heat medium of the heat exchanger heated by the heat exchanger combined with the low temperature heat medium from the bypass pipe is introduced into the snow melting panel. Since the output of the heat source is proportionally controlled so that the medium temperature becomes the target temperature, the heat medium supplied to the snow-melting panel regardless of changes in the outside temperature, etc. It is possible to accurately maintain the temperature of 3 to a relatively low target temperature suitable for snow melting, and to keep the forward temperature and the return temperature of the heat medium substantially constant. For this reason, the heat medium at an appropriate temperature continuously flows, the heat radiation loss is suppressed as much as possible, the heat exchange efficiency is improved, and it is possible to contribute to energy saving and to perform a stable snow melting operation. .

[Brief description of drawings]

FIG. 1 is a system diagram of a snow melting device showing an embodiment of the present invention,
FIG. 2 is an explanatory view of the heat output characteristic of the heat source device, and FIG. 3 is a system diagram of a snow melting device showing another embodiment of the present invention. (1) ... heat source machine, (2) ... heat source, (3) ... heat exchanger, (4) ... snow melting panel, (5) ... circulation pump,
(6) (7) …… Pipe, (8) …… Bypass pipe, (9)
...... Flow rate adjustment valve, (10) …… Hot water sensor, (11) …… Controller.

Claims (1)

[Scope of utility model registration request] 1. A heat source having a heat output variable type heat source, a heat exchanger having a heat exchanger heated by the heat source, and a snow melting panel, and the heat exchanger and the snow melting panel are annular with a pipe having a circulation pump. Connected to a bypass pipe having a flow rate adjusting valve in parallel with the heat exchanger, the heat medium heated by the heat exchanger and the low-temperature heat medium from the bypass pipe are combined into a snow melting panel. A snow melting apparatus comprising a temperature sensor for detecting a heat medium temperature of a pipe to be introduced, and a controller for proportionally controlling a heat output of the heat source so that a detection value of the sensor reaches a target value.