JP2007225126A - Solar heat utilization system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly distribute hot water heated by utilizing solar heat to a plurality of hot water supply objects at a set temperature. <P>SOLUTION: The hot water heated by a solar collector 10 is adjusted to the set temperature through a temperature adjusting device 12 including a heating device 60 and a water mixing device 62, and supplied to the plurality of hot water supply objects through a passage 100. A plurality of gauging devices 16 respectively detect the amount of hot water supplied to each of the plurality of hot water supply objects. The heating device 60 is disposed at an upstream side of the water mixing device 62. When temperature difference obtained by subtracting the set temperature from a temperature of the hot water in a hot water storage tank 30 is less than first set temperature difference, only the heating device 60 is operated. When it is more than second set temperature difference larger than the first set temperature difference, only the water mixing device 62 is operated. When the temperature difference is more than the first set temperature difference and less than the second set temperature difference, both of the heating device 60 and the water mixing device 62 are operated. The heating device 60 is controlled to a second set temperature higher than the set temperature, and the hot water heated to the second set temperature by controlling the water mixing device 62 is mixed with the water to be cooled to the set temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solar heat utilization system that distributes hot water heated using solar heat to a plurality of hot water supply objects.

A solar heat utilization system that distributes hot water heated using solar heat to a plurality of hot water supply targets is described in Patent Document 1, for example. Hot water heated using solar heat is supplied to facilities where hot water is used, such as washrooms and kitchens.
JP 2005-61640 A

In this way, when there are a plurality of hot water supply objects in one house, there is no problem with the system described in Patent Document 1, but for example, when hot water is distributed to a plurality of households in an apartment house. A problem arises when there are a plurality of persons who bear the expense required for hot water supply. The temperature of hot water heated by solar heat is higher or lower than a set temperature (for example, 45 ° C.) or unstable depending on conditions such as the amount of solar radiation of the day. In addition, there is a limit to the amount of hot water that can be stored in solar hot water storage tanks. The person who used it may run out of hot water heated by solar heat, and the person who wants to use it after that has to use the hot water heated by the heating device, and uses the system by the solar heat which is natural energy. Unlike the case, the benefits of saving heating costs cannot be obtained, and unfairness among multiple users can occur.
With the above circumstances as a background, the present invention is capable of stably supplying hot water at a set temperature to a plurality of hot water supply objects and being able to make the burden of heating costs even among the plurality of hot water supply objects while being a solar heat utilization system. It was made as an issue to provide things.

  The above-mentioned problems are related to a solar heat utilization system that distributes hot water heated using solar heat to a plurality of hot water supply targets, a heat collecting device that collects solar heat, and hot water heated by solar heat collected by the heat collecting device. A temperature control device that adjusts the temperature of the water to a set temperature, a distribution device that is provided downstream of the temperature control device and distributes hot water adjusted to the set temperature by the temperature control device to a plurality of hot water supply objects, and the distribution A plurality of calibration devices that are provided on the downstream side of the device and detect the amount of hot water supplied to each of the plurality of hot water supply objects, and the temperature control device further includes hot water heated by solar heat. A heating device that heats, a water mixing device that lowers the temperature by mixing water with hot water heated by solar heat, and the heating device that operates when the temperature of hot water heated by solar heat is lower than the set temperature Thereby, is solved by as including a selective control unit for operating the water mixing device is higher than the set temperature.

  In the solar heat utilization system having the above configuration, the temperature of hot water heated by the solar heat collected by the heat collecting device is adjusted to the set temperature by the temperature adjusting device. The temperature control device includes a heating device, a water mixing device, and a selective control unit. When the temperature of hot water heated by solar heat is lower than the set temperature, the temperature adjusting device is heated to the set temperature by the heating device and heated by solar heat. When the temperature of the hot water is higher than the set temperature, it is lowered to the set temperature by mixing water. The hot water adjusted to the set temperature is stably distributed to a plurality of hot water supply objects by the distribution device. In addition, since the amount of hot water supplied to each of the plurality of hot water supply objects is detected by the plurality of calibration devices, the hot water charge can be collected from each hot water supply object according to the amount of hot water supply. All hot water supply objects can be stably supplied with hot water at a set temperature, and whether the hot water supplied by each hot water supply object is heated by solar heat or heated by fuel or electricity Regardless of whether the hot water was used during the time when solar heat can be used effectively or during the time when it cannot be used effectively, the average usage fee per unit of hot water will be paid. , The feeling of unfairness disappears.

  In addition, if the owner of the housing complex installs and operates a hot water supply facility using a solar heat utilization system and collects the hot water charge, it saves fuel and electricity so that solar heat can be used more effectively. Since the profit is increased, the installation of the solar heat utilization system is promoted, and the effect of suppressing the environmental destruction is also obtained.

Aspects of the Invention

  In the following, the invention that is claimed to be claimable in the present application (hereinafter referred to as “claimable invention”. The claimable invention is at least the “present invention” to the invention described in the claims. Some aspects of the present invention, including subordinate concept inventions of the present invention, superordinate concepts of the present invention, or inventions of different concepts) will be illustrated and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

  In the following items, item (3) corresponds to claim 1, item (5) corresponds to claim 2, and item (7) corresponds to claim 3.

(1) A solar heat utilization system that distributes hot water heated using solar heat to a plurality of hot water supply targets,
A heat collecting device for collecting solar heat;
A temperature control device that adjusts the temperature of hot water heated by solar heat collected by the heat collector to a set temperature;
A distribution device that is provided on the downstream side of the temperature control device and distributes the hot water adjusted to a set temperature by the temperature control device to the plurality of hot water supply objects;
A solar heat utilization system, comprising: a plurality of calibration devices that are provided on the downstream side of the distribution device and respectively detect the amount of hot water supplied to each of the plurality of hot water supply objects.
(2) The temperature control device includes a heating device for further heating the hot water heated by the solar heat, and a water mixing device for mixing water with the hot water heated by the solar heat to lower the temperature (1) The solar heat utilization system as described in the item.
The temperature control device is often configured to include a heating device and a water mixing device, but the heating device heats hot water with an electric heater or a combustion heating device, and requires heating costs. Therefore, it is desirable not to operate as much as possible, and it is desirable to operate the heating device only when the temperature of hot water supplied to the hot water supply target is actually insufficient or when there is a possibility that it will be insufficient in the near future. The hot water heated by the solar heat is consumed earlier, and the heat collection efficiency of the heat collection device is increased.
(3) A selective control unit that operates the heating device when the temperature of the hot water heated by the solar heat is lower than the set temperature, and operates the water mixing device when the temperature is higher than the set temperature. A solar heat utilization system according to item (2), including a temperature control device control device.
The heating device and the water mixing device may be connected in series or in parallel between the heat collecting device and the distribution device. In any case, the selective control unit controls the temperature of hot water near the outlet of the temperature control device to the set temperature by selecting and operating only one of them.
(4) The solar heat utilization system according to (2) or (3), wherein the heating device is disposed upstream of the water mixing device.
(5) The water mixing device controls the heating device so that the temperature of hot water in the vicinity of the outlet of the heating device is higher than the set temperature, and lowers the hot water having a temperature higher than the set temperature to the set temperature. The solar-heat utilization system as described in the item (4) including a temperature control device control device including both control units for controlling the temperature.
In the solar heat utilization system of this section, the heating device heats the hot water heated by solar heat to a temperature higher than the set temperature, and the water mixing device mixes the hot water with the hot water to make the hot water at the set temperature. In the heating apparatus and the water mixing apparatus, the latter is often easier to perform accurate temperature control, and this section is particularly effective in that case. This is because hot water having a set temperature can be accurately supplied from the distributor to each hot water supply object.
When this term is subordinate to the term (3), the temperature controller control device includes both the selective control unit and the both control unit. In that case, the selective control unit is activated in a situation where sufficient temperature control accuracy can be obtained by the selective control unit, and both control units are activated in situations where sufficient temperature control accuracy cannot be obtained depending on the selective control unit. It is effective to provide a control unit selection unit to be made to do.
When controlling the heating device to be higher than the set temperature, for example, the heating device is controlled so that the temperature of the hot water near the outlet of the heating device becomes the second set temperature set higher than the set temperature. The heating device is controlled within the range where the heating device can be operated continuously and the amount of heating is minimized (however, when the flow rate of hot water is small, the hot water will boil in the heating device) In order to avoid this, it is not excluded to stop the operation of the heating device). In the former case, the temperature of hot water near the outlet of the heating device is substantially constant (second set temperature), but in the latter case, the temperature of hot water near the outlet of the heating device is not always constant. Absent. If it is higher than the set temperature, it may be any number of times.
However, as described above, since it is desirable that the heating device is not operated as much as possible, the second set temperature is as long as it is guaranteed that hot water of the set temperature can be supplied to the hot water supply target at a preset pressure. Therefore, it is desirable to set it as low as possible. In addition, when the heating device is controlled under the condition that the continuous operation range and the calorific value can be minimized, the selective control unit is operated in principle, while the selective control unit continuously operates the heating device. It is desirable to select (switch) between the selective control unit and both control units so that both control units are selected when hot water having a substantially set temperature cannot be supplied to the hot water supply target.
For example, when the heating device is a combustion type heating device that heats hot water by burning gaseous fuel or liquid fuel, when the temperature of hot water from the heat collecting device is sufficiently lower than the set temperature, or the flow rate of hot water is sufficiently large In this case, it is easy to finely control the temperature of hot water in the vicinity of the outlet of the heating device by continuously controlling the amount of fuel supplied to the combustion heating device. However, when the temperature of the hot water is close to the set temperature or when the flow rate is small, the combustion of the fuel is repeatedly started (referred to as ON) or stopped (referred to as OFF). It is not preferable because the life of the heating device is reduced or the thermal efficiency is lowered. Therefore, it is possible to give hysteresis to the ON / OFF threshold temperature of the combustion type heating device so as not to perform frequent ON / OFF control or to prevent ON / OFF control from being performed. desirable. And, in order to be able to accurately set the temperature of the hot water near the outlet of the temperature controller, that is, near the outlet of the water mixing device, in any state within the hysteresis range, it is slightly higher than the set temperature. It is desirable to set the high second set temperature as the target temperature so that the combustion heating apparatus can be controlled as much as possible or always by continuous control of the fuel supply amount.
The solar heat utilization system of this section includes a temperature sensor provided in the vicinity of the outlet of the water mixing device, and includes a mixing device control device that controls the water mixing device based on the detection result of the temperature sensor. desirable. The heating device control device is based on the condition that the temperature of the hot water near the outlet of the heating device control device should be the second set temperature based on the information of the water mixing status in the water mixing device supplied from the mixing device control device. Even if the heating device is operated, a temperature sensor provided near the outlet of the heating device may be included, and the heating device may be controlled so that the detection result of the temperature sensor becomes the second set temperature. In the former case, there is an advantage that the temperature sensor for controlling the water mixing device can also be used for controlling the heating device.
(6) The solar heat utilization system according to (2) or (3), wherein the water mixing device is disposed upstream of the heating device.
(7) The heating device that controls the water mixing device so that the temperature of hot water in the vicinity of the outlet of the water mixing device is lower than the set temperature, and heats hot water having a temperature lower than the set temperature to the set temperature. The solar heat utilization system according to item (6), including a temperature control device including both control units to be controlled.
In the solar heat utilization system of this section, the water mixing device mixes water with hot water heated by solar heat to a temperature lower than the set temperature, and the hot device heats the hot water to set the hot water at the set temperature. This section is particularly effective when the temperature is more easily controlled by the former in the heating device and the water mixing device (for example, when the heating device is an electric heater). This is because hot water having a set temperature can be accurately supplied from the distributor to each hot water supply object.
When this term is subordinate to the term (3), the temperature controller control device includes both the selective control unit and the both control unit. In that case, for example, the selective control unit is operated in a situation where sufficient temperature control accuracy is obtained by the selective control unit, and in the situation where sufficient temperature control accuracy cannot be obtained depending on the selective control unit, both control units are operated. It is effective to provide a control unit selection unit that activates.
When controlling the water mixing device so that the temperature of the hot water at the outlet thereof is lower than the set temperature, for example, a third set temperature in which the temperature of the hot water near the outlet of the water mixing device is set lower than the set temperature. (For example, in order to be able to accurately supply hot water of a set temperature to the hot water supply target while continuously operating the heating device on the downstream side) or to the water mixing device Control under existing restrictions (for example, control the water mixing device under conditions where the temperature of the hot water at its outlet can be accurately controlled and the amount of water mixing is minimized) can do. In the former case, the temperature of the hot water near the outlet of the water mixing device is substantially constant (third set temperature). In the latter case, the temperature of the hot water near the outlet of the water mixing device is set to a desired temperature. Not always possible. As long as it is lower than the set temperature, it can be repeated any number of times.
As described above, it is desirable that the heating device is not operated as much as possible, and the third set temperature is as much as possible as long as it is guaranteed that hot water at the set temperature can be supplied to the hot water supply target at a preset pressure. It is desirable to set it high.
Further, it is desirable to include a heating device control device that has a temperature sensor provided in the vicinity of the outlet of the heating device and controls the heating device based on the detection result of the temperature sensor. The water mixing device controller performs water mixing under the condition that the temperature of the hot water near the outlet of the water mixing device should be the third set temperature based on information on the heating status in the heating device supplied from the heating device control device. Even if the device is operated, a temperature sensor may be provided in the vicinity of the outlet of the water mixing device, and the water mixing device may be controlled so that the detection result of the temperature sensor becomes the third set temperature. In the former case, there is an advantage that the temperature sensor for controlling the heating device can also be used for controlling the water mixing device.
(8) a hot water storage tank for storing hot water heated by the solar heat;
A water supply device for supplying water to the hot water storage tank and the water mixing device;
A solar heat utilization system according to any one of (2) to (7), including a regulator that controls a water supply pressure of the water supply device to a set pressure.
In the solar heat utilization system of this section, the hot water supply pressure to the hot water supply object is indirectly controlled to the set pressure by maintaining the pressure of the hot water storage tank and the water mixing device at the set pressure by the regulator. The hot water supply pressure in each hot water supply object is guaranteed regardless of the size of the total consumption flow rate of hot water in a plurality of hot water supply objects.
(9) a heat exchanger for exchanging heat with hot water stored in the hot water storage tank;
The solar heat utilization system according to item (8), including a heat medium liquid circulation device that circulates a heat medium liquid between the heat exchanger and the heat collector.

  Hereinafter, embodiments of the claimable invention will be described with reference to the drawings. In addition to the following examples, the claimable invention can be practiced in various modifications based on the knowledge of those skilled in the art, including the aspects described in the above [Aspect of the Invention] section. .

  FIG. 1 shows a solar heat utilization system as one embodiment. The solar heat utilization system includes a heat collecting device 10 for collecting solar heat, a temperature adjusting device 12 for adjusting the temperature of hot water heated by the solar heat collected by the heat collecting device 10 to a set temperature (for example, 45 ° C.), The distribution device 14 is provided downstream of the temperature adjustment device 12 and distributes the hot water adjusted to the set temperature by the temperature adjustment device 12 to each door of the multiple dwelling house, and provided downstream of the distribution device 14. And a plurality of calibration devices 16 for detecting the amount of hot water supplied to each of the plurality of hot water supply objects.

  The heat collector 10 is a solar heat utilization device having a solar heat collector 20, a heat exchanger 22, and a heat medium liquid circulation device 24. The solar heat collector 20 includes a heat medium liquid holding unit (not shown) that holds a heat medium liquid as a heat medium. For example, the solar heat collector 20 is provided on the roof of a building and filled in the heat medium liquid holding unit. Solar heat is collected by the heat transfer fluid being warmed by solar heat.

  The heat exchanger 22 is usually provided below the solar heat collector 20 and includes a hot water storage tank 30 for storing water and a heat exchanger 32 disposed therein. The heat transfer device 32 is, for example, one in which a metal tube is wound many times in a spiral shape, and both end portions thereof are connected to the heat transfer fluid holding portion of the solar heat collector 20 by passages 34 and 36, respectively. The passages 34 and 36 are constituted by pipes, for example, and a circulation path 38 is constituted including the passages 34 and 36.

  The heat medium liquid circulation device 24 includes a heat medium liquid circulation pump 40 provided in the passage 34. The circulation pump 40 is driven by a pump motor 42 as an electric motor which is a kind of drive source. When the heat medium liquid circulation pump 40 is operated, the heat medium liquid is circulated in the circulation path 38, and heat of the heat medium is transferred to the water in the hot water storage tank 30 by heat exchange in the heat transfer device 32. Heat the water or hot water inside. A pressure change suppressor 44 is also provided in the middle of the passage 34. The pressure change suppressor 44 functions to keep the heat medium liquid holding part and the circulation path 38 of the solar heat collector 20 at a substantially constant pressure regardless of the expansion and contraction of the heat medium liquid. A relief valve and a check valve are connected in parallel to the upper part of the recirculation path 38 in which the upper ends of the circulation path 38 are opened at the part below the hot water surface of the hot water tank whose upper part is released to the atmosphere. Or the like. The relief valve opens when the pressure in the circulation path 38 becomes equal to or higher than the set pressure, and allows the air in the hot water storage device to flow out into the atmosphere. The check valve flows in the air from the air into the hot water storage device. Is allowed to prevent the pressure in the circulation path 38 from becoming negative.

  The hot water storage tank 30 is provided in the middle of the liquid passage 50, and is connected to the water supply device 52 at the lower portion thereof and connected to the temperature control device 12 at the upper portion thereof. The water supplied from the water supply device 52 is adjusted to an appropriate pressure by a regulator (pressure adjusting valve) 54 and supplied to the hot water storage tank 30. If hot water is supplied from the hot water storage tank 30 to a plurality of hot water supply objects through the temperature control device 12 described later, and the amount of hot water in the hot water storage tank 30 decreases, water flows from the water supply device 52 into the hot water storage tank 30.

  The temperature control device 12 includes a heating device 60 that further heats the hot water heated by the heat collecting device 10, and a water mixing device 62 that mixes water with the hot water heated by solar heat to lower the temperature. The heating device 60 and the water mixing device 62 are provided on the downstream side of the hot water storage tank 30 in the liquid passage 50. In the present embodiment, the heating device 60 is provided on the upstream side of the water mixing device 62.

  The heating device 60 includes a boiler 70 and heats the water in the liquid passage 50 using a gas that is a kind of fuel as an energy source. The heating device 60 is an example of a combustion type heating device. In the liquid passage 50, a temperature sensor 72 that emits an electric signal corresponding to the temperature is provided in the vicinity of the outlet of the boiler 70 so that the temperature of hot water supplied by heating by the boiler 70 is detected. The boiler 70 is controlled by a boiler controller 76 which is a heating device controller. The temperature sensor 72 is connected to the boiler controller 76.

  The water mixing device 62 includes a water mixing valve 80. In the vicinity of the outlet of the water mixing valve 80, a temperature sensor 82 that emits an electrical signal corresponding to the temperature is provided. The water mixing valve 80 is an electromagnetic control valve whose opening and closing is controlled by a water mixing valve controller 86, and can electrically control the mixing rate of water. The hot water tank side port 90 of the water mixing valve 80 is connected to the hot water storage tank 30 via the heating device 60 by the liquid passage 50, the water supply device side port 92 is connected to the water supply device 52 by the passage 94, and the distribution device side port 96 is The liquid passage 98 is connected to the distribution device 14. If the water supply device side port 92 is opened and communicated with the hot water storage tank side port 90 to the distribution device side port 96, the hot water is mixed with water and the temperature is lowered and supplied to the distribution device 14 side through the passage 98. . If the temperature of hot water supplied from the hot water storage tank 30 side is low, the amount of water flowing in from the water supply device side port 92 and mixed with hot water is reduced, and the amount of hot water flowing in from the hot water storage tank side port 90 is reduced. The temperature of the hot water supplied to the distributor 14 side is increased by being increased. If the temperature of the hot water flowing in from the hot water storage tank side port 90 becomes lower than the set temperature, mixing of water from the water supply device side port 92 is prevented, and only hot water from the hot water storage tank 30 is supplied to the distributor 14 side.

The distributor 14 is branched from the liquid passage 98 and includes a plurality of liquid passages 100 for supplying hot water to a plurality of hot water supply objects. The liquid passages 100 are each provided with the calibration device (calibration meter) 16.
The distribution device may include a distribution valve device that maintains the liquid pressure in the liquid passages 100 equal regardless of the flow rate of the hot water flowing through each of the plurality of liquid passages 100.

In the present embodiment, the temperature control device 12 is controlled as follows in order to supply hot water having a set temperature to a plurality of hot water supply objects.
The temperature sensor 72 (or temperature sensor 82) detects the temperature of hot water supplied from the hot water storage tank 30 warmed by the heat collecting apparatus 10, and the temperature difference obtained by subtracting the set temperature from the temperature of the hot water is the first set temperature difference. When it is smaller than (for example, −4 ° C.), the boiler 70 is operated. The boiler controller 76 controls the boiler 70 so that the temperature of the hot water detected by the temperature sensor 72 becomes the set temperature. And the water mixing apparatus 62 is not operated.
When the temperature difference is equal to or greater than a second set temperature difference (for example, 0 ° C.) that is larger than the first set temperature difference, the heating device 60 is not operated and the water mixing valve controller 86 performs water mixing. Valve 80 is controlled. The water from the water supply device 52 is mixed with the hot water that has passed through the liquid passage 50 and lowered to the set temperature.

  Further, when the temperature difference is not less than the first set temperature difference and smaller than the second set temperature difference, the boiler 70 and the water mixing valve 80 are operated together. The boiler controller 76 controls the boiler 70 so that the temperature of the hot water detected by the temperature sensor 72 becomes a second set temperature (for example, 47 ° C.) set higher than the set temperature. The second set temperature is set higher than the set temperature, but is set as low as possible as long as it is guaranteed that hot water at the set temperature can be supplied to the hot water supply target at a preset pressure. The Then, the water mixing valve 80 is controlled, and water is supplied from the water supply device 52 so that hot water having a temperature higher than the set temperature is lowered to the set temperature. The hot water heated to the second set temperature by the boiler 70 is mixed with water, and the temperature is lowered to the set temperature.

As described above, when the temperature of the hot water supplied from the hot water storage tank 30 is lower than the set temperature and the temperature difference is relatively small, the water is mixed after being heated to a temperature higher than the set temperature by the boiler 70 once. The reason why the temperature is lowered to the set temperature is that there is a lower limit for the amount of temperature increase that can be controlled by continuously operating the boiler 70. In order to increase the temperature by a temperature lower than the lower limit value, it is necessary to cause the boiler 70 to be repeatedly turned on and off (operation and non-operation), so that the life of the boiler 70 is reduced, soot is generated due to incomplete combustion, and thermal efficiency is reduced. The problem will occur.
The hot water adjusted to the set temperature as described above is supplied to each hot water supply object via the distribution device 14 and the calibration device 16.

  Thus, according to the present embodiment, the hot water warmed by the heat collecting apparatus 10 can be supplied to a plurality of hot water supply objects accurately and stably at the set temperature. Further, by detecting the amount of hot water supplied to each of a plurality of hot water supply objects by a plurality of calibration devices, the used charge can be collected from each hot water supply object according to the amount of hot water supply. Furthermore, the hot water supply energy cost calculated from the difference between the average tap water temperature and the hot water supply temperature can be borne by each hot water supply object in accordance with the amount of hot water supplied to each hot water supply object. The hot water supply energy cost includes energy obtained by solar heat, and the manager or owner of the apartment house has a fuel cost corresponding to the energy obtained by solar heat and a facility cost for installing the solar heat utilization device. The profit corresponding to the difference between the two can be expected, and the installation of the solar heat utilization system is promoted.

In the present embodiment, the boiler controller 76 and the water mixing valve controller 86 each constitute a temperature controller control device. In the boiler controller 76, when the temperature difference is smaller than the first set temperature difference, a portion that operates the boiler 70, and in the water mixing valve controller 86, when the temperature difference is equal to or larger than the second set temperature difference, the water mixing valve The portion that operates 80 forms a selective control unit. Further, in the boiler controller 76 and the water mixing valve controller 86, when the temperature difference is equal to or larger than the first set temperature difference and smaller than the second set temperature difference, the parts for operating the boiler 70 and the water mixing valve 80, respectively. Both form a control unit.
In addition, when a relatively large temperature fluctuation (for example, a temperature error of ± 3 ° C.) is allowed in the hot water supplied to the hot water supply target, the boiler is maintained while the temperature of the hot water supplied from the hot water storage tank 30 is within the allowable error range. 70 and the water mixing valve 80 can be prevented from being operated. In this case, the temperature controller control device does not include both control units, and includes only the selective control unit.

In the embodiment shown in FIG. 1, the heating device 60 is disposed on the upstream side of the water mixing device 62. However, as shown in FIG. 2, the water mixing device is placed on the upstream side of the heating device. It may be arranged.
In the case of the present embodiment, the heating device 110 includes an electric heater 112. The electric heater 112 is controlled by the heater controller 114, and high-precision temperature control is easy.

The water mixing device 110 and the heating device 60 in the present embodiment are controlled as follows.
When the temperature difference obtained by subtracting the set temperature from the temperature of the hot water heated by the heat collecting apparatus 10 (for example, the temperature of the hot water detected by the temperature sensor 82) is smaller than the first set temperature difference (for example, -1 ° C), The mixing valve 80 is not controlled, the electric heater 112 is controlled, and the hot water heated by the heat collecting apparatus 10 is heated to the set temperature. When the temperature difference is equal to or greater than the second set temperature difference (for example, + 1 ° C.) that is larger than the first set temperature difference, the electric heater 112 is not operated and the water mixing valve 80 is controlled. When the temperature difference is not less than the first set temperature difference and smaller than the second set temperature difference, neither the water mixing valve 80 nor the electric heater 112 is operated.

In this embodiment, in the heater controller 114, when the temperature difference is smaller than the first set temperature difference, the temperature difference is greater than or equal to the second set temperature difference in the portion that operates the electric heater 112 and the water mixing valve controller 86. In this case, the portion that operates the water mixing valve 80 jointly constitutes a selective control unit.
In addition, you may arrange | position the heating apparatus 110 containing the electric heater 112 in the upstream of a water mixing apparatus. It is also possible to arrange a heating device including a boiler downstream of the water mixing device.

  The water mixing device may include a wax-type temperature control device and mechanically control the water mixing rate. An example is shown in FIG. In addition, since the structure of the whole solar heat utilization system is the same as FIG. 1 or FIG. 2, illustration and description are abbreviate | omitted. In the following description, the example of FIG. 1 will be described. The water mixing device 116 in this embodiment includes a water mixing valve 118. The water mixing valve 118 is a commercially available mixing valve called MT303 manufactured by NTC Corporation, and will be described briefly.

  In the housing 120 of the water mixing valve 118, a valve hole 122, a hot water storage tank side port 124, a water supply device side port 126, and a distribution device side port 128 are provided. The hot water storage tank side port 124 is connected to the hot water storage tank 30 side by the liquid passage 50, the water supply device side port 126 is connected to the water supply device 52 by the passage 94, and the distribution device side port 128 is connected to the distribution device 14 side by the passage 98. Has been. In the water mixing valve 118, the operation of the valve element 140 and the drive member 142 accommodated in the valve hole 122 causes the distribution device side port 128 to communicate with the hot water storage tank side port 124 and the water supply device side port 126. And a state communicating with both ports 134 and 136 are obtained.

  The valve element 140 has a cylindrical shape and is biased in a direction away from the valve seat 146 by a compression coil spring 144 which is a kind of elastic member. The movement limit of the valve element 140 due to the bias of the spring 144 is defined by the valve element 140 coming into contact with another valve seat 148 provided in the housing 120.

  The drive member 142 has an axial shape, and one end portion in the axial direction is provided by a valve element 140 and the other end portion is provided by a dial 150 serving as a hot water temperature setting member or a hot water temperature adjusting member screwed into the housing 120. Is supported so as to be relatively movable. The dial 150 has a bottomed cylindrical shape, and a holding member 152 accommodated therein so as to be movable in the axial direction holds the driving member 142. The holding member 152 is urged by the compression coil spring 154 so as to protrude from the dial 150, and the drive member 142 is movable in the axial direction with respect to the dial 150. The movement limit of the holding member 152 or the driving member 142 due to the bias of the spring 154 is defined by a stopper portion 156 provided on the dial 150.

  In this embodiment, the driving member 142 is a temperature-sensitive driving member, and expands when the hot water temperature supplied from the hot water storage tank 30 to the water mixing valve 118 is higher than the set temperature, and the valve element 140 of the spring 144 is expanded. It moves toward the valve seat 146 against the urging force. Therefore, as shown in FIG. 3, the valve element 140 is always in contact with the valve seat 148, and the water supply device side port 126 that is the low temperature side port is closed, while the hot water storage tank side port 124 that is the high temperature side port is opened. However, if hot water having a temperature higher than the set temperature is supplied from the hot water storage tank 30, the drive member 142 extends and the valve element 140 resists the biasing force of the spring 144. Then, the valve seat 146 is moved in the direction of seating. As a result, the water supply device side port 126 is opened and communicated with the hot water storage tank side port 124 to the distribution device side port 128. The hot water is mixed with water to lower the temperature and supplied from the passage 98 to the distribution device 14. . When the temperature of the hot water supplied from the hot water storage tank 30 is low and the drive member 142 contracts, the valve element 140 is moved away from the valve seat 146 by the bias of the spring 144 and flows into the water supply device side port 126. As a result, the amount of water mixed with the hot water is reduced, and the amount of hot water flowing from the hot water storage tank side port 124 is increased, so that the temperature of the hot water supplied to the distributor 14 is raised. If the temperature of the hot water flowing in from the hot water storage tank side port 124 becomes lower than the set temperature, the valve element 140 is kept seated on the valve seat 148, and mixing of water from the water supply device side port 126 is prevented, and the hot water storage tank Only hot water from 30 is supplied to the distributor 14.

  The position of the driving member 142 is adjusted by operating the dial 150 and adjusting the screwing amount with respect to the housing 120, and the temperature of hot water when the valve element 140 is seated on the valve seats 146, 148 is adjusted. The temperature of the hot water supplied to the device 14 is adjusted. The drive member 142 is moved to the valve element 140 side as the screwing amount of the dial 150 to the housing 120 is increased. Accordingly, the drive member 142 causes the valve element 140 to be seated on the valve seat 146 with a small expansion amount. If the temperature of the hot water supplied from the hot water storage tank 30 is the same and the expansion amount is the same, The opening area of the device-side port 126 is increased, the amount of water flowing in from the water supply device 52 is increased, and the temperature of hot water obtained by mixing with water is lowered. On the contrary, as the screwing amount of the dial 150 with respect to the housing 120 is reduced, the drive member 142 requires a larger amount of expansion for the valve element 140 to be seated on the valve seat 146, and If the temperature is the same, the amount of water mixed with hot water is small, and the temperature of hot water obtained by mixing with water is increased. When the expansion amount of the drive member 142 is large and the valve element 140 is further extended from the state where the valve member 140 is seated on the valve seat 146, the holding member 152 is retracted against the urging force of the spring 154, and the drive member 142. Is allowed to extend. If the valve element 140 is seated on the valve seat 146, hot water is not supplied from the hot water storage tank 30 to the distribution device 14, but the drive member 142 contracts due to the temperature drop and the valve element 140 is separated from the valve seat 146. Hot water is supplied from the hot water storage tank 30 to the distribution device 14 when the distribution device side port 128 is brought into communication with the hot water storage tank side port 124.

  As shown in FIG. 4, the heating device 60 and the water mixing device 62 may be controlled by a common controller (control device) 200. The configuration other than the controller 200 can be the same as that of the solar heat utilization system shown in FIG.

  The controller 200 stores a temperature control device control program represented by the flowchart of FIG. In the present embodiment, in order to supply hot water having a set temperature to a plurality of hot water supply objects, the temperature control device 12 is controlled as follows by executing the temperature control device control program. In step 1 (hereinafter abbreviated as S1. The same applies to other steps), the temperature of the hot water in the hot water storage tank 30 warmed by the heat collector 10 is acquired. In the present embodiment, the hot water temperature detected by the temperature sensor 72 is used as the hot water temperature, but the hot water temperature detected by the temperature sensor 82 may be used, or the temperature at which the hot water temperature in the hot water storage tank 30 is detected. A sensor may be provided.

  Subsequently, in S2, a temperature difference obtained by subtracting the set temperature from the hot water temperature acquired in S1 is acquired. In S3, it is determined whether or not the temperature difference is greater than or equal to the first set temperature difference. If the determination in S3 is NO, the boiler 70 is operated in S4. The boiler 200 is controlled by the controller 200 so that the temperature of the hot water detected by the temperature sensor 72 becomes the set temperature.

  If the determination in S3 is YES, it is determined in S5 whether or not the temperature difference is smaller than the second set temperature difference. If the determination in S5 is NO, the water mixing valve 80 is controlled in S6, and water from the water supply device 52 is supplied so that hot water having a temperature higher than the set temperature is lowered to the set temperature. The water from the water supply device 52 is supplied to the hot water that has passed through the liquid passage 50, and is lowered to the set temperature.

If the determination in S5 is YES, in S7, the boiler 70 causes the controller 200 so that the temperature of the hot water detected by the temperature sensor 72 becomes the second set temperature set higher than the set temperature. Be controlled. The second set temperature is set higher than the set temperature, but is set as low as possible as long as it is guaranteed that hot water at the set temperature can be supplied to the hot water supply target at a preset pressure. The
In S8, the water mixing valve 80 is controlled, the hot water warmed to the second set temperature by the boiler 70 is mixed with water, and the temperature is lowered to the set temperature.

  Note that it is possible to omit at least one of the temperature sensor 72 of the heating device 60 and the temperature sensor 82 of the water mixing device 62. For example, when the temperature sensor 72 is omitted, the heating device 60 uses the controller 200 to determine the temperature of the hot water near the outlet of the heating device 60 based on the information on the water mixing status in the water mixing device 62. It is operated under the conditions that should be the set temperature.

  In the solar heat utilization system of each of the above embodiments, it is possible to adopt a configuration in which at least one of the water mixing device and the heating device is integrated with the hot water storage tank.

It is a circuit diagram of the solar-heat utilization system which is one Example of claimable invention. It is a circuit diagram of the solar heat utilization system which is another Example. It is a front view (partial cross section) which shows the water mixing valve in the solar-heat utilization system which is another Example. It is a circuit diagram of the solar heat utilization system which is another Example. It is a flowchart showing the temperature control apparatus control program memorize | stored in the control apparatus of the solar-heat utilization system of FIG.

Explanation of symbols

  10: Heat collecting device 12: Temperature adjusting device 14: Distributing device 16: Calibration device 20: Solar heat collector 24: Heat medium liquid circulating device 30: Hot water storage tank 52: Water supply device 54: Pressure adjusting valve 60: Heating device 62: Water Mixing device 70: Boiler 72: Temperature sensor 76: Boiler controller 80: Water mixing valve 82: Temperature sensor 86: Water mixing valve controller 110: Heating device 112: Electric heater 114: Heater controller 116: Water mixing device 118: Water mixing valve 200: Controller

Claims (3)

A solar heat utilization system that distributes hot water heated using solar heat to a plurality of hot water supply targets,
A heat collecting device for collecting solar heat;
(a) a heating device for further heating the hot water heated by the solar heat, (b) a water mixing device for mixing water with the hot water heated by the solar heat to lower the temperature, and (c) heated by the solar heat. Including a selective control unit that activates the heating device when the temperature of the hot water is lower than the set temperature, and activates the water mixing device when the temperature is higher than the set temperature, and the solar heat collected by the heat collector A temperature control device that adjusts the temperature of the hot water to a set temperature;
A distribution device that is provided on the downstream side of the temperature control device and distributes the hot water adjusted to a set temperature by the temperature control device to the plurality of hot water supply objects;
A solar heat utilization system, comprising: a plurality of calibration devices that are provided on the downstream side of the distribution device and respectively detect the amount of hot water supplied to each of the plurality of hot water supply objects.   The heating device is disposed on the upstream side of the water mixing device, and the heating device is controlled so that the temperature of hot water in the vicinity of the outlet of the heating device is higher than the set temperature, and a temperature higher than the set temperature. The solar-heat utilization system of Claim 1 containing the temperature control apparatus control apparatus containing both the control parts which control the said water mixing apparatus so that hot water may be reduced to the said setting temperature.   The water mixing device is arranged on the upstream side of the heating device, and the water mixing device is controlled so that the temperature of hot water in the vicinity of the outlet of the water mixing device is lower than the set temperature. The solar-heat utilization system of Claim 1 containing the temperature control apparatus control apparatus containing both control parts which control the said heating apparatus which heats the hot water of low temperature to the said setting temperature.

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