JP2015137841A - Solar hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar hot water supply system that can achieve high efficiency.SOLUTION: A solar hot water supply system comprises: a heat collector 11 that collects solar heat; a hot water storage tank 21 that stores hot water; a hot water storage tank piping part 33 that passes through the inside of the hot water storage tank; a high-temperature side sensor 13 that detects a temperature of a heat medium in a heat collector piping part; and a low-temperature side sensor 15 that detects a temperature of the hot water in the hot water storage tank. A control device 61 controls operation and stoppage of a circulating pump 41 on the basis of a difference between the temperature of the heat medium detected by the high-temperature side sensor 13 and the temperature of the hot water detected by the low-temperature side sensor 15.

Description

  The present invention relates to a solar hot water supply system.

  2. Description of the Related Art Conventionally, there has been known a solar heat-use hot water supply system that heats a heat medium using solar heat and heats water stored in a hot water tank by heat transfer from the heated heat medium (see Patent Document 1).

JP-A-8-303876

  First, with reference to FIG. 5, the solar-powered hot water supply system disclosed in Patent Document 1 will be described. As shown in FIG. 5, the solar water heating system of Patent Document 1 is arranged so as to pass through a heat collector 1 that collects solar heat, a hot water storage tank 3, a cistern 4, a circulation pump 5, and these parts. And a piping section 6.

  The pipe part 6 includes a heat collector pipe part (not shown) that passes through the inside of the heat collector 1 and a hot water tank pipe part 7 that passes through the hot water tank 3 and functions as a heat exchanger. Have. The heat collector 1 collects solar heat and heats the heat medium that passes through the heat collector pipe section using the collected heat. The hot water storage tank 3 is a member for storing water to be heated or heated water (that is, hot water). The water stored in the hot water storage tank 3 is heated by the heated heat medium passing through the hot water storage tank piping section 7. The cistern 4 is used for temporarily storing the heat medium. The circulation pump 5 circulates the heat medium in the order of the heat collector 1, the hot water tank 3, and the cistern 4 through the piping unit 6 by pressurizing the heat medium. Hot water stored in the hot water storage tank 3 is discharged from a hot water pipe (not shown) and used.

  According to the solar-heat-use hot water supply system of Patent Document 1 having the above-described configuration, water can be heated using solar heat and the heated water can be used.

  In recent years, there has been a demand for further improvement in the efficiency of solar hot water supply systems.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the solar-heating hot water supply system which can be highly efficient.

In order to achieve the above-described object, the solar water heating system according to the present invention is characterized by the following points.
(1) a collector that collects solar heat;
A hot water storage tank for storing hot water,
A collector pipe section that passes through the inside of the collector, and a hot water tank pipe section that passes through the interior of the hot water tank, and a pipe section through which the heat medium flows,
A circulation pump for flowing the heating medium through the pipe part;
A control device for controlling operation and stop of the circulation pump;
A high-temperature side sensor that is disposed in the vicinity of the heat collector and detects the temperature of the heat medium in the heat collector piping section;
A low temperature side sensor that is disposed in the vicinity of the hot water tank and detects the temperature of the hot water in the hot water tank;
With
The control device controls the operation and stop of the circulation pump based on the difference between the temperature of the heat medium detected by the high temperature side sensor and the temperature of hot water detected by the low temperature side sensor.

  According to the solar heat utilization hot water supply system of (1) above, the operation and stop of the circulation pump are controlled based on the difference between the temperature of the heat medium in the collector pipe section and the temperature of the hot water in the hot water storage tank. For example, when the heat medium is heated in the heat collector piping section and the temperature of the heat medium rises, and the difference from the temperature of hot water in the hot water storage tank becomes larger than a predetermined value, the circulation pump operates. Also, when the temperature of the hot water in the hot water tank rises due to heat exchange in the hot water tank piping, and the difference between the temperature of the heat medium in the heat collector piping and the temperature of the hot water in the hot water tank becomes smaller than a predetermined value, it circulates. The pump stops. As a result, for example, higher efficiency can be achieved as compared with a case where the circulation pump is always operated. Further, when the temperature of the heat medium in the heat collector piping section becomes higher than a predetermined value, the circulation pump can be stopped to prevent excessive heat collection.

(2) The solar-powered hot water supply system according to (1) above,
The said high temperature side sensor is arrange | positioned in the most downstream part in the said collector pipe part.

In the heat collector piping part, the temperature of the heat medium flowing through the most downstream part becomes the highest.
According to the hot water supply system using solar heat of (2) above, since the high temperature side sensor is arranged at the most downstream part in the collector pipe part, the temperature of the heat medium that can be used as a heat source is accurately grasped and the circulation pump Control can be performed.

(3) The hot water supply system using solar heat according to (1) or (2) above,
The low temperature side sensor is disposed below the hot water tank.

In the hot water storage tank, the temperature of the hot water staying downward is lowered.
According to the solar hot water supply system of (3) above, since the low temperature side sensor is arranged below the hot water storage tank, it is possible to accurately grasp the temperature of hot water that needs to be heated and control the circulation pump. it can.
In addition, if it is set as the structure arrange | positioned at the lowest part in the area | region where the hot water tank piping part in a hot water tank extends in a low temperature side sensor, hot water can be heated more efficiently.

(4) The solar-powered hot water supply system according to any one of (1) to (3) above,
The pipe part connects the heat collector pipe part and the hot water tank pipe part, the heat collection return pipe through which the heat medium flows from the heat collector pipe part toward the hot water tank pipe part, and the collector. A heat collector piping section and the hot water storage tank piping section, and a heat collection outlet pipe through which the heat medium flows from the hot water storage tank piping section toward the heat collector piping section,
The heat collecting piping section is configured to be capable of storing the heat medium and is provided with a cistern that is open to the atmosphere, and the circulation pump is disposed on the collector pipe section side of the cistern. ing.

According to the hot water supply system using solar heat of (4) above, by using a cistern that is open to the atmosphere, the heat collecting circuit can be opened and the pressure in the piping section can be lowered. In addition, the heat medium can be returned to the cistern and stored during excessive heat collection.
In contrast, a conventional solar water heating system uses a hermetic heat collecting circuit without a cis-turn. In this conventional solar hot water supply system, it is necessary to provide a sealed expansion tank (accumulator) for storing a high-pressure fluid in order to mitigate an increase in pressure in the piping due to a temperature rise. In addition, since the temperature of the heat medium temporarily rises during overheat collection and the internal pressure increases, it is necessary to make the piping part metal. Alternatively, in order to cope with excessive heat collection, it is necessary to provide a reserve tank for temporarily storing the heat medium. For these reasons, the conventional solar hot water supply system is expensive to manufacture.
In this respect, according to the solar heat-utilizing hot water supply system of (4), it is not necessary to provide these sealed expansion tanks and reserve tanks, so that the manufacturing cost can be reduced. Moreover, since the heat collection circuit is an open type, the pressure in the piping part can be lowered. In addition, since the internal pressure does not increase, the piping portion is made of resin, so that the manufacturing cost can be further reduced.

  According to the present invention, it is possible to provide a solar hot water supply system capable of increasing efficiency.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as an embodiment) with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a solar hot water supply system according to an embodiment. 2 (a) and 2 (b) are views showing the appearance of the hot water tank, FIG. 2 (a) is a side view seen from one side, and FIG. 2 (b) is FIG. 2 (a). It is the side view seen from the arrow IIb side in). FIG. 3A and FIG. 3B are views showing the appearance of the hot water tank in a state of being housed in the exterior. FIG. 4 is a diagram for explaining the shape of the rectifying plate and its operation. FIG. 5 is a schematic diagram showing a conventional solar heat collecting system.

  Hereinafter, the solar-heating hot water supply system which concerns on embodiment of this invention is demonstrated with reference to FIGS.

<Outline of Solar Water Heating System 10>
As shown in FIG. 1, a solar water heating system 10 according to the embodiment includes a heat collector 11 that heats a heat medium using solar heat, a hot water storage tank 21 for storing hot water, and a pipe through which the heat medium flows. Main part 31, circulation pump 41 for flowing the heat medium through piping part 31, cistern 51 configured to be able to store the heat medium, and control device 61 for controlling the operation and stop of circulation pump 41. It is provided as a configuration.

  The piping part 31 is a resin pipe, and the collector pipe part 32 that passes through the inside of the heat collector 11 and the hot water tank pipe part 33 that passes through the inside of the hot water tank 3 and functions as a heat exchanger. And have. The piping unit 31 connects the heat collector piping unit 32 and the hot water tank piping unit 33, and the heat collecting return piping 35 through which a heat medium flows from the heat collector piping unit 32 toward the hot water storage tank piping unit 33. And a heat collecting piping 37 that connects the collector pipe portion 32 and the hot water tank piping portion 33 and through which a heat medium flows from the hot water tank piping portion 33 toward the heat collector piping portion. ing. Note that the piping part 31 may be made of rubber or metal (for example, copper).

  The heat collector 11 has, for example, a heat collecting plate (not shown) therein, collects solar heat, and uses the collected heat as a heat medium that passes through the heat collector piping section 32. Heat. As the heat medium, for example, propylene glycol which is an antifreeze solution may be used, and water may be used when there is no fear of freezing.

  The hot water storage tank 21 stores water to be heated or heated water (that is, hot water). The water stored in the hot water tank 21 is heated by the heated heat medium passing through the hot water tank piping section 33. That is, the hot water tank piping part 33 functions as a heat exchanger.

  The circulation pump 41 is provided in the middle of the heat collecting piping 37 and circulates the heat medium between the heat collector 11 and the hot water storage piping 33. The cistern 51 is provided between the hot water storage tank 21 and the circulation pump 41 in the heat collecting forward piping 37. The cistern 51 is configured to be able to store a heat medium. The cistern 51 is open to the atmosphere, thereby absorbing the expansion and contraction of the heat medium.

  By using the cistern 51 opened to the atmosphere, the pressure in the piping part 31 can be lowered by using the heat collecting circuit as an open type. Further, the heat medium can be returned to the cistern 51 and stored during excessive heat collection. As a result, according to the solar heat utilizing hot water supply system 10, it is not necessary to provide a sealed expansion tank or a reserve tank, so that the manufacturing cost can be reduced. Moreover, since the heat collection circuit is an open type, the pressure in the piping part 31 can be lowered. Moreover, since the internal pressure does not increase, the piping portion 31 is made of resin, and the manufacturing cost can be reduced.

  As shown in FIGS. 1 to 3, the hot water storage tank 21 has a water supply port 23 connected to a water supply pipe 71 for supplying water from the waterworks at the lower portion, and a hot water outlet connected to a hot water discharge pipe 73 for discharging hot water. 25 at the top. The hot water tank 21 is a sealed tank made of metal (for example, stainless steel) having excellent corrosion resistance. The hot water storage tank 21 is a vertical type in order to make it easy to gather hot hot water at the upper part having the hot water outlet 25, and is supported by a solid leg portion 26. Details of the structure of the periphery of the hot water tank 21 will be described later with reference to FIGS. In the present embodiment, the hot water outlet 25 is formed in the upper part of the hot water storage tank 21, but the hot water outlet 25 may be formed in the lower part of the hot water storage tank 21.

  Referring again to FIG. 1, a pressure reducing valve 75 and a drain valve 77 are disposed in a water supply pipe 71 that supplies water to the hot water storage tank 21. The pressure reducing valve 75 is a valve that adjusts the water supply pressure to the hot water storage tank 21 in order to keep the pressure in the hot water storage tank 21 constant.

  A hot water supply device (auxiliary heater) 81 that heats hot water discharged from the hot water storage tank 21 as necessary is connected to the hot water discharge pipe 73 via a temperature control valve 79. A water supply pipe 83 for mixing branched from the water supply pipe 71 downstream of the pressure reducing valve 75 is connected to the temperature control valve 79, and hot water in the hot water storage tank 21 and cold water supplied from the water supply pipe 71 are mixed in advance. Water enters the vessel 81. A switching valve 87 connected to a direct water supply pipe 85 branched from the water supply pipe 71 upstream of the pressure reducing valve 75 is disposed between the temperature control valve 79 and the water heater 81. By using this switching valve 87, it is possible to switch between the case where the water entering the water heater 81 is made from the hot water outlet pipe 73 and the case where the water is made directly from the water supply pipe 71.

  The control device 61 is connected to two temperature sensors, the high temperature side sensor 13 and the low temperature side sensor 15.

  The high temperature side sensor 13 is disposed in the vicinity of the heat collector 11 and detects the temperature of the heat medium in the heat collector pipe section 32. More specifically, the high temperature side sensor 13 is disposed in the most downstream part of the heat collector pipe part 32, that is, in the vicinity of the connection point with the heat collection return pipe 35. This is because the temperature of the heat medium flowing through the most downstream portion is the highest in the heat collector piping portion 32. That is, if the high temperature side sensor 13 is arranged at the most downstream portion in the heat collector piping section 32, the temperature of the heat medium that can be used as a heat source can be accurately grasped.

  The low temperature side sensor 15 is disposed in the vicinity of the hot water tank 21 and detects the temperature of the hot water in the hot water tank 21. More specifically, it is arranged below the hot water tank 21, more specifically near the bottom. This is because in the hot water storage tank 21, hot water that has already been warmed easily accumulates in the upper part, and the hot water is stored in a layered manner in which the temperature decreases from the upper part toward the bottom part. In other words, if the low temperature side sensor 15 is arranged below the hot water storage tank 21, the temperature of the hot water that needs to be heated can be detected. More specifically, in the hot water storage tank 21, the water located below the hot water tank piping section 33 is less likely to be heated, so the low temperature side sensor 15 is connected to the hot water storage tank 21. It is preferable to arrange in the vicinity of the lowermost part of the extending part of the piping part 33.

  The control device 61 controls the operation and stop of the circulation pump 41 based on the difference between the temperature of the heat medium detected by the high temperature side sensor 13 and the temperature of hot water detected by the low temperature side sensor 15. For example, in the control device 61, the heat medium is heated in the heat collector piping section 32, the temperature of the heat medium rises, and the difference from the temperature of the hot water in the hot water tank 21 is a predetermined value (for example, 6 ° C.). If larger than that, the circulation pump 41 is operated. Moreover, the temperature of the hot water in the hot water storage tank 21 rises by the heat exchange in the hot water storage tank piping part 33, and the control apparatus 61 increases the temperature of the heat medium in the collector pipe part 32, and the temperature of the hot water in the hot water storage tank 21. When the difference between the two becomes smaller than a predetermined value (for example, 2 ° C.), the circulation pump 41 is stopped. Moreover, the control apparatus 61 stops the circulation pump 41, when the temperature of the heat medium in the heat collector piping part 32 becomes higher than predetermined value (for example, 95 degreeC).

  Thus, according to the solar-heat-use hot water supply system 10 which concerns on embodiment, the action | operation of the circulation pump 41 is based on the difference of the temperature of the heat medium in the collector pipe part 32, and the temperature of the hot water in the hot water tank 21. Further, since the stop is controlled, for example, higher efficiency can be achieved as compared with the case where the circulation pump 41 is always operated. Further, since the circulation pump 41 is stopped when the temperature of the heat medium in the heat collector piping section 32 becomes higher than a predetermined value, it is possible to prevent excessive heat collection.

  In particular, in the solar water heating system 10 according to the embodiment, since the high temperature side sensor 13 is disposed at the most downstream portion in the heat collector piping section 32, the temperature of the heat medium that can be used as a heat source is accurately grasped and circulated. The pump 41 can be controlled.

  Moreover, in the solar-heating hot water supply system 10 which concerns on embodiment, since the low temperature side sensor 15 is arrange | positioned under the hot water storage tank 21, the temperature of the hot water which needs heating is grasped | ascertained accurately, and control of the circulation pump 41 is carried out. It can be carried out.

<Structure around the hot water tank 21>
The structure of the peripheral part of the hot water tank 21 will be described. 2 (a) and 2 (b) are views showing the appearance of the hot water tank, FIG. 2 (a) is a side view seen from one side, and FIG. 2 (b) is FIG. 2 (a). It is the side view seen from the arrow IIb side in). FIG. 3A and FIG. 3B are views showing the appearance of the hot water tank in a state of being housed in the exterior.

  Specifically, as shown in FIGS. 2 (a) and 2 (b), around the hot water storage tank 21, a heat collection return pipe 35, a heat collection return pipe 37, a circulation pump 41, a cistern 51, a control device. 61, a water supply pipe 71, a hot water discharge pipe 73, and the like are arranged. In addition, a heater (not shown) for preventing freezing is provided in the periphery of the hot water tank 21 at positions indicated by reference signs A to E in FIGS. 2 (a) and 2 (b). These anti-freezing heaters are connected to the control device 61 and operate and stop in accordance with instructions from the control device 61. The control device 61 controls the operation and stop of the anti-freezing heater based on the outside air temperature detected by an outside air temperature sensor (not shown) for detecting the outside air temperature provided on the leg portion 26, for example. For example, when the control device 61 detects that the outside air temperature has become 2 ° C. or lower, the control device 61 stops the antifreezing heater. Thereby, even if it is a case where external temperature falls, it can prevent piping etc. freezing.

  These freeze prevention heaters are provided in the vicinity of each functional component as shown in FIGS. 2 (a) and 2 (b). This is because the vicinity of the functional component has a large surface area and is easily cooled by the outside air.

  Further, the hot water storage tank 21 and the heat collection return pipe 35, the heat collection forward pipe 37, the circulation pump 41, the systern 51, the control device 61, the water supply pipe 71, the hot water supply pipe 73, As shown in FIG. 3A and FIG. 3B, the freeze prevention heater and the like are all housed in a single exterior 91. Thus, in the solar-heat-use hot water supply system 10 which concerns on embodiment, since the main member is accommodated in the inside of the single exterior 91, its beauty is good and its workability is also high.

<Rectifying plate 27>
In the solar hot water supply system 10 according to the embodiment, as shown in FIGS. 1 and 4, a rectifying plate 27 is disposed at a location corresponding to the water supply port 23 in the hot water storage tank 21. FIG. 4 is a diagram for explaining the shape of the rectifying plate and its operation.

  The rectifying plate 27 is a member for adjusting the flow of water in the hot water storage tank 21. In the hot water storage tank 21, hot water that has already been warmed easily accumulates in the upper portion, and the hot water is stored in a layered manner in which the temperature decreases from the top toward the bottom. In order to efficiently take out the hot water accumulated in the upper part in this way, the hot water outlet 25 is provided in the upper part of the hot water storage tank 21, and hot water is supplied from the hot water outlet 25. In this regard, when the rectifying plate 27 is not provided, the hot water stored in the hot water storage tank 21 is agitated by the momentum of the water supplied from the water supply port 23, and the hot water may not be efficiently taken out. There is. On the other hand, the rectifying plate 27 is provided to suppress the agitation, and has a function of weakening the momentum of the water supplied from the water supply port 23 and gradually introducing water into the hot water tank 21. . In the present embodiment, the rectifying plate 27 has a symmetrical shape as shown in FIG.

Below, it summarizes briefly about the solar-heat-use hot water supply system 10 which concerns on embodiment.
(1) A solar water heating hot water supply system 10 includes a heat collector 11 that collects solar heat, a hot water storage tank 21 for storing hot water, a heat collector pipe section 32 that passes through the inside of the heat collector 11, A hot water tank piping section 33 that passes through the interior of the hot water tank 21, a piping section 31 through which a heat medium flows, a circulation pump 41 for flowing the heat medium through the piping section 31, and the circulation pump 41. A control device 61 that controls the operation and stop of the heat collector, a high-temperature side sensor 13 that is disposed in the vicinity of the heat collector 11 and detects the temperature of the heat medium in the heat collector pipe section 32, and the hot water storage tank 21. , And a low temperature side sensor 15 for detecting the temperature of the hot water in the hot water storage tank 21. The control device 61 operates and stops the circulation pump 41 based on the difference between the temperature of the heating medium detected by the high temperature side sensor 13 and the temperature of hot water detected by the low temperature side sensor 15. Control.
(2) In the solar heat utilizing hot water supply system 10, the high temperature side sensor 13 is arranged at the most downstream part in the heat collector pipe part 32.
(3) In the solar water heating hot water supply system 10, the low temperature side sensor 15 is disposed in the lower part of the hot water storage tank 21.
(4) In the solar hot water supply system 10, the pipe part 31 connects the collector pipe part 32 and the hot water tank pipe part 33 to the hot water tank pipe part 33 from the collector pipe part 32. The heat collecting return pipe 35 through which the heat medium flows, the heat collector pipe part 32 and the hot water tank pipe part 33 are connected, and the hot water tank pipe part 33 is directed toward the heat collector pipe part 32. It further has a heat collection and return pipe 37 through which the heat medium flows. Further, the heat collection outlet pipe 37 is provided with a cistern 51 configured to be able to store the heat medium and open to the atmosphere, and the heat collector pipe section 32 side of the cistern 51 is disposed on the heat collector pipe section 32 side. A circulation pump 41 is arranged.

  The technical scope of the present invention is not limited to the embodiment described above. The above-described embodiments can be accompanied by various modifications and improvements within the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10: Solar hot water supply system 11: Heat collector 13: High temperature side sensor 15: Low temperature side sensor 21: Hot water storage tank 27: Current plate 31: Piping part 32: Heat collector piping part 33: Hot water tank piping part 35: Heat collecting Return piping 37: Heat collection piping 41: Circulation pump 51: Systurn 61: Control device 91: Exterior

Claims (4)

A collector that collects solar heat,
A hot water storage tank for storing hot water,
A collector pipe section that passes through the inside of the collector, and a hot water tank pipe section that passes through the interior of the hot water tank, and a pipe section through which the heat medium flows,
A circulation pump for flowing the heating medium through the pipe part;
A control device for controlling operation and stop of the circulation pump;
A high-temperature side sensor that is disposed in the vicinity of the heat collector and detects the temperature of the heat medium in the heat collector piping section;
A low temperature side sensor that is disposed in the vicinity of the hot water tank and detects the temperature of the hot water in the hot water tank;
With
The control device controls the operation and stop of the circulation pump based on the difference between the temperature of the heating medium detected by the high temperature side sensor and the temperature of hot water detected by the low temperature side sensor.
A solar hot water supply system characterized by that. The high temperature side sensor is arranged at the most downstream part in the collector pipe part,
The hot water supply system using solar heat according to claim 1. The low temperature side sensor is disposed in the lower part of the hot water storage tank,
The solar hot water supply system according to claim 1 or 2, wherein The pipe part connects the heat collector pipe part and the hot water tank pipe part, the heat collection return pipe through which the heat medium flows from the heat collector pipe part toward the hot water tank pipe part, and the collector. A heat collector piping section and the hot water storage tank piping section, and a heat collection outlet pipe through which the heat medium flows from the hot water storage tank piping section toward the heat collector piping section,
The heat collecting piping section is configured to be capable of storing the heat medium and is provided with a cistern that is open to the atmosphere, and the circulation pump is disposed on the collector pipe section side of the cistern. ing,
The solar-powered hot-water supply system of any one of Claims 1-3 characterized by the above-mentioned.

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