JP2010107087A - Piping unit and solar hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping unit and a solar hot water supply system for reducing the man-hours for construction by improving construction performance, and adjusting the temperature of the water supplied to a water heater. <P>SOLUTION: The piping unit 30 includes a mixing valve 31; a cold water passage pipe 37 connected to a water supply source and a solar water heater and in which cold water flows; a cold-water branch pipe 38 connected to the mixing valve 31 and the cold-water passage pipe 37; a warm-water inlet pipe 39 connected to the mixing valve 31 and the solar water heater; a mixed water lead-out pipe 40 connected to the mixing valve 31 and the water heater; an input temperature sensor 32 for detecting the temperature of the cold water flowing in the cold-water passage pipe 37; and an output temperature sensor 33 and a flow rate sensor 34, respectively for detecting the temperature and the flow rate of the mixed water flowing in the mixture water flowing in the mixed water lead-out pipe 40. The mixing valve 31, cold-water passage pipe 37, cold-water branching pipe 38, warm-water branching pipe 39, mixed water lead-out pipe 40, input-temperature sensor 32, output-temperature sensor 33 and flow rate sensor 34 are housed inside a case 35. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention comprises a solar water heater and a water heater disposed downstream of the solar water heater, and a piping unit used in a solar water heater system that calculates the amount of heat that can be reduced in the water heater by the solar water heater, and The present invention relates to such a solar water heating system.

  Reduction of carbon dioxide emissions, which is considered as one of the factors against the background of the manifestation of the effects of global warming, is demanded. In particular, with the increase in energy consumption in houses in recent years, the amount of carbon dioxide emitted from houses tends to increase, and reduction of carbon dioxide emitted from such houses has become an urgent issue.

  In order to reduce carbon dioxide emissions, it is necessary to promote the use of energy that does not emit carbon dioxide when used instead of fossil fuels. Such energy that does not emit carbon dioxide includes natural energy such as solar energy, wind power, and geothermal energy. Among these natural energies, solar energy is relatively easy to use in a house. Promotion of the introduction of equipment using solar energy is being considered as a pillar of measures to reduce carbon emissions.

  As an apparatus using such solar energy, there is a solar water heater, for example. However, conventionally, a solar water heater is equipped with only a single function of obtaining hot water by solar heat, and how much energy (that is, the amount of heat) a user can obtain by the solar water heater, that is, It was impossible to know how much the consumption of gas and electricity could be reduced by obtaining the amount of heat with a solar water heater, and how much carbon dioxide emission could be reduced. As a solution to this problem, there is a solar hot water supply system shown below.

  As shown in FIG. 4, such a solar hot water supply system 701 is connected to a water pipe 705 serving as a water supply source, and a solar water heater 710 that generates hot water by heating cold water supplied from the water pipe 705 with solar heat. A gas water heater 720 disposed downstream of the solar water heater 710 and heating hot water supplied from the solar water heater 710 to generate hot water at a predetermined temperature; and cold water supplied to the solar water heater 710 An input temperature sensor 732 for detecting the temperature of the water, an output temperature sensor 733 for detecting the temperature of the hot water output from the solar water heater 710, a flow rate sensor 734 for detecting the flow rate of the hot water, an input temperature sensor 732, and an output temperature sensor 733 and an in-home display panel 740 to which a flow rate sensor 734 is connected.

  The home display board 740 includes a microcomputer, and the temperature of the cold water detected by the input temperature sensor 732, the temperature of the hot water detected by the output temperature sensor 733, and the flow rate of the hot water detected by the flow sensor 734, The amount of heat obtained by the solar water heater 710, that is, the amount of heat required to generate hot water that can be reduced in the gas water heater 720 by the solar water heater 710 is calculated, and the calculated amount of heat is calculated on the home display panel 740. Display on the display. The solar hot water supply system 701 supplies the generated hot water to a demanding unit 706 such as a kitchen or a bath. According to such a solar water heating system 701, the amount of heat required to generate hot water that can be reduced in the gas water heater 720 by the solar water heater 710 is displayed, thereby contributing to the user's reduction of carbon dioxide emissions. I was able to know the degree.

  However, in the solar water heating system 701 as described above, the input temperature sensor 732 is provided with the output temperature sensor 733 and the flow rate sensor 734 in the cold water pipe 761 through which the cold water supplied from the water pipe 705 flows toward the solar water heater 710. The hot water supplied from the solar water heater 710 is individually installed in the hot water pipes 762 that flow toward the water heater, and the space between the sensors and the home display panel 740 is scattered. Since wiring is performed using individual cables, for example, when installing a solar water heating system into an existing hot water supply facility, the workability is poor. There was a problem that it hindered the spread of water heaters.

  Moreover, the upper limit temperature of the water which can be supplied with respect to the gas water heater which has spread widely is defined. However, in the above-described solar hot water supply system 701, the gas water heater 720 is directly supplied with hot water from the solar water heater 710, so the temperature of the water (hot water) supplied to the gas water heater cannot be adjusted, and the gas hot water supply. There is a possibility that hot water exceeding the upper limit temperature of the water heater 720 may be supplied, and there is a problem that the gas water heater 720 breaks down.

  The present invention aims to solve the above problems. That is, an object of the present invention is to provide a piping unit and a solar water heating system capable of improving the workability and reducing the number of work steps and adjusting the temperature of water supplied to the water heater.

In order to achieve the above object, the invention described in claim 1 includes a solar water heater and a water heater disposed downstream of the solar water heater, and water supplied from a water supply source is Solar heat for calculating the amount of heat that can be reduced in the water heater by the solar water heater when the solar water heater or the hot water having a predetermined temperature is generated by being heated by the solar water heater and the water heater. A piping unit used in a hot water supply system, (i) a cold water input port to which water supplied from the water supply source is input, a hot water input port to which water supplied from the solar water heater is input, and A mixing means comprising: a mixed water output port that outputs mixed water in which water input to the cold water input port and water input to the hot water input port are mixed at a predetermined ratio; Is connected to the water supply source and A cold water passage pipe having an end connected to a water inlet of the solar water heater, and water supplied from the water supply source flowing toward the solar water heater, and (c) one end of the water heater at the cold water input port A cold water branch pipe connected and having the other end connected to a central portion of the cold water passage pipe, and a portion of the water flowing through the cold water passage pipe flowing toward the cold water input port; Is connected to the hot water input port and the other end is connected to the water outlet of the solar water heater, and a hot water introduction pipe in which water supplied from the solar water heater flows toward the hot water input port, E) Mixing in which one end is connected to the mixed water output port and the other end is connected to the water inlet of the water heater, so that water output from the mixed water output port flows toward the water heater. And (f) detecting the temperature of the water flowing through the cold water passage pipe. A force temperature sensor; (g) an output temperature sensor for detecting the temperature of water flowing through the mixed water outlet pipe; (h) a flow rate sensor for detecting the flow rate of water flowing through the mixed water outlet pipe; A case in which each of the mixing means, the cold water passage pipe, the cold water branch pipe, the hot water inlet pipe, the mixed water outlet pipe, the input temperature sensor, the output temperature sensor, and the flow rate sensor are integrally housed; And a piping unit characterized by comprising:

  In the invention described in claim 2, in the invention described in claim 1, signals output from each of the input temperature sensor, the output temperature sensor, and the flow rate sensor are connected, and these It is characterized by having a wiring connection part for connecting the above signal to an external device.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein the mixing means receives the valve body and the drive control signal and inputs the cold water at a rate corresponding to the drive control signal. Drive means for driving the valve body so as to mix water input to the mouth and water input to the hot water input port.

  The invention described in claim 4 includes a solar water heater, a water heater disposed downstream of the solar water heater, a water supply source, the solar water heater, and a piping unit connected to the water heater. When the water supplied from the water supply source is heated by the solar water heater, or the solar water heater and the water heater, and hot water having a predetermined temperature is generated, the solar water heater In a solar water heating system provided with a calorific value calculating means for calculating a calorific value that can be reduced in a water heater, the piping unit includes the piping unit according to any one of claims 1 to 3, and A calorific value calculating means, the temperature of water flowing through the cold water passage pipe detected by the input temperature sensor, the temperature of water flowing through the mixed water outlet pipe detected by the output temperature sensor, and A solar water heating system, which is means for calculating the amount of heat reduced in the water heater by the solar water heater based on the flow rate of water flowing through the mixed water outlet pipe detected by the flow sensor It is.

  The invention described in claim 5 is the invention described in claim 4, wherein the amount of heat that can be reduced in the water heater by the solar water heater can be reduced in the water heater by the solar water heater and Calculated by conversion information storage means storing conversion information for conversion into at least one of the carbon dioxide emissions, the conversion information stored in the conversion information storage means, and the heat quantity calculation means Based on the heat quantity, a reduction index calculating means for calculating at least one of the amount and the carbon dioxide emission amount, and at least one of the amount and the carbon dioxide emission amount calculated by the reduction index calculation means Display means for displaying.

  According to the first and fourth aspects of the present invention, each of the input temperature sensor, the output temperature sensor, and the flow rate sensor is integrally accommodated in one case. There is no need to install them, and by installing a case, these sensors can be installed together, and workability can be improved. In addition, each of the mixing means, the cold water passage pipe, the cold water branch pipe, the hot water inlet pipe, and the mixed water outlet pipe is integrally accommodated in the case, so the piping of the solar hot water supply system can be performed around the piping unit. That is, it is possible to configure a solar water heating system by connecting each of the water supply source, solar water heater, and water heater only with the piping unit. Therefore, the piping configuration can be simplified and the workability can be improved. . Therefore, by improving the workability, it is possible to reduce the man-hours required for installation and wiring, reduce the cost of the solar hot water supply system, and promote its spread.

  Moreover, since the water supplied from the solar water heater is mixed with the water supplied from the water supply source by the mixing means, the temperature of the water heated by the solar water heater can be lowered. When the upper limit temperature of water that can be supplied is specified, the temperature of the water mixed by the mixing means is supplied from the water heated by the solar water heater and the water supply source so that the temperature is lower than the upper limit temperature. The temperature of the water supplied to the water heater can be adjusted by mixing water with a predetermined ratio. Therefore, it is possible to prevent water having a temperature exceeding the upper limit temperature from being supplied to the water heater, and to prevent a failure of the water heater.

  Moreover, since the input temperature sensor detects the temperature of the water flowing through the cold water passage pipe, that is, when the hot water is generated by the solar hot water supply system, the temperature of the water is detected at the location where the water supplied from the water supply source always flows. Therefore, the temperature of the water supplied from the water supply source can be accurately detected, and therefore, the amount of heat reduced in the water heater by the solar water heater can be accurately calculated.

  According to the second aspect of the present invention, signals output from the input temperature sensor, the output temperature sensor, and the flow rate sensor are connected, and these signals are connected to an external device. Since the wiring connection section is provided, the signals output from each sensor are collected into one wiring connection section. Therefore, the wiring connection section and an external device such as a home display panel are composed of a plurality of conductive wires. By connecting with one cable, the wiring of each sensor can be facilitated, the workability can be further improved, and the number of construction steps can be reduced.

  According to the invention described in claim 3, the mixing means receives the valve control signal, the drive control signal, and the water input to the hot water input port and the input to the cold water input port at a rate corresponding to the drive control signal. Drive means for driving the valve body so that the mixed water is mixed, and by supplying a drive control signal from the outside, the water heated by the solar water heater and supplied from the water supply source The mixing ratio with water can be changed arbitrarily. For example, in a configuration using a mixing device in which the temperature of water after mixing is fixed in advance, such as a thermostatic mixing valve, water supplied from a solar water heater when 60 ° C. hot water is required If the temperature of the mixing valve is 75 ° C. and the set temperature of the mixing valve is 40 ° C., the temperature of the water after mixing will be lowered to 40 ° C. Therefore, it is necessary to reheat to 60 ° C. with a water heater. In the configuration including the valve body and the driving means described above, the mixing ratio can be changed so that the temperature of the mixed water becomes a desired temperature (for example, 60 ° C.) Hot water having a desired temperature can be obtained without heating again, and energy (heat amount) consumed in a water heater can be reduced.

  According to the fifth aspect of the present invention, the amount of heat that can be reduced in the water heater by the solar water heater is converted into at least one of the amount that can be reduced in the water heater by the solar water heater and the amount of carbon dioxide reduction. Therefore, it is possible to make the user aware of the reduction indicators such as the amount of money saved or saved by solar water heaters and carbon dioxide emissions, which encourages energy savings such as gas, Reduction can be promoted.

  Hereinafter, a piping unit and a solar hot water supply system according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the piping unit 30 includes a case 35, a mixing valve 31 as a mixing means, a cold water passage pipe 37, a cold water branch pipe 38, a hot water introduction pipe 39, a mixed water outlet pipe 40, An input temperature sensor 32, an output temperature sensor 33, a flow rate sensor 34, and a connector 36 as a wiring connection portion are provided.

  The case 35 is made of synthetic resin, sheet metal, or the like, and includes a lower case 351 and an upper case (not shown) so that the case 35 can be divided into two parts. The lower case 351 includes a rectangular bottom surface portion 351a and a wall portion 351b that stands from the periphery of the bottom surface portion 351a and surrounds the bottom surface portion 351a. A bracket (not shown) for fixing the case 35 to a wall surface of a house or the like is provided on the outer surface of the bottom surface portion 351a. On the inner surface of the bottom surface portion 351a, a cold water passage pipe 37, a cold water branch pipe 38, A plurality of clamps 55 for fixing the hot water introduction pipe 39 and the mixed water outlet pipe 40 in the case 35 are provided. Similar to the lower case 351, the upper case has an upper surface (not shown) having the same shape as the bottom surface 351a of the lower case, and a wall (not shown) that stands from the periphery of the upper surface and surrounds the upper surface. It is equipped with. The respective wall portions of the lower case 351 and the upper case are joined with their end portions overlapped to constitute a wall portion 35b composed of four flat plate portions (reference numerals 35b1 to 35b4). The lower case 351 and the upper case are bonded and fixed to each other by, for example, an engagement means including an adhesive, a hooking claw, and a claw receiving portion, and the bottom surface portion 35a (that is, the bottom surface portion 351a). ), A box-shaped case 35 composed of an upper surface portion and a wall portion 35b. The shape of the case 35 is arbitrary as long as it does not contradict the purpose of the present invention.

  The mixing valve 31 includes, for example, a temperature-sensitive spring that automatically adjusts the mixing ratio of hot water and cold water so that the temperature of mixed water (that is, mixed water) becomes a predetermined temperature. It is an automatic temperature control (thermostat type) hot and cold water mixing valve. The mixing valve 31 includes a cold water input port 31a to which water (cold water) supplied from a water supply source is input, a hot water input port 31b to which water (hot water) supplied from a solar water heater is input, hot water and cold water And a mixed water output port 31c from which water (mixed water) in which the water is mixed is output, and the temperature-sensitive spring described above is deformed according to the temperature of the hot water, whereby the mixed water output port 31c Hot water and cold water are mixed at a predetermined ratio so that the temperature of the output mixed water becomes a predetermined temperature.

  The cold water passage pipe 37 is a pipe formed in an L shape, and one end portion 37a is arranged to protrude from the flat plate portion 35b2 of the wall portion 35b of the case 35, and the other end portion 37b is connected to the flat plate portion 35b2. It is disposed so as to protrude from the flat plate portion 35b1 which is orthogonally adjacent. A central portion 37 c of the cold water passage pipe is disposed in the case 35. One end 37a of the cold water passage pipe 37 is connected to a water supply source through a pipe line or the like. The other end 37b of the cold water passage pipe 37 is connected to a water inlet of the solar water heater through a pipe or the like. The cold water passage pipe 37 is supplied with water (cold water) supplied from a water supply source from one end portion 37a toward the other end portion 37b, and the cold water is supplied to the solar water heater.

  The cold water branch pipe 38 is a line formed in a straight line, one end 38 a is connected to the cold water input port 31 a of the mixing valve 31, and the other end 38 b is connected to the central part 37 c of the cold water passage pipe 37. Has been. That is, the cold water branch pipe 38 is arranged so as to branch from the cold water passage pipe 37, and a part of the cold water flowing through the cold water passage pipe 37 passes through the other end portion 38 b (that is, the cold water passage pipe 37). Flow toward the one end 38a (that is, the cold water input port 31a), and the cold water is input to the cold water input port 31a.

  The hot water introduction pipe 39 is a pipe formed in a straight line, one end portion 39a is connected to the hot water input port 31b of the mixing valve 31, and the other end portion 39b is disposed so as to protrude from the flat plate portion 35b1. Yes. That is, the other end 39 b of the hot water introduction pipe 39 and the other end 37 b of the cold water passage pipe 37 are directed in the same direction and protrude from the case 35. The other end 37b of the hot water introduction pipe 39 is connected to a water outlet of the solar water heater through a pipe line or the like. In the hot water introduction pipe 39, water (hot water) supplied from the solar water heater flows from the other end portion 39b toward the one end portion 39a (that is, the hot water input port 31b), and the hot water enters the hot water input port. It is input to 31b. Moreover, since the other end part 39b of the hot water introduction pipe 39 and the other end part 37b of the cold water passage pipe 37 are directed in the same direction and protrude from the case 35, a solar water heater is provided at each of the other end parts 39b and 37b. Can be easily connected.

  The mixed water lead-out pipe 40 is a pipe formed in an L shape, one end portion 40a is connected to the mixed water output port 31c of the mixing valve 31, and the other end portion 40b is a flat plate facing the flat plate portion 35b1. It protrudes from the part 35b3. The other end 40b of the mixed water outlet pipe 40 is connected to a water inlet of the water heater through a pipe line or the like. In the mixed water outlet pipe 40, mixed water in which cold water and hot water are mixed at a predetermined ratio flows from the one end 40a (that is, the mixed water output port 31c) toward the other end 40b, Mixed water is supplied to the water heater.

  The cold water passage pipe 37 and the cold water branch pipe 38 are connected and fixed to each other by, for example, a screw structure, and similarly, the mixing valve 31, the cold water branch pipe 38, the hot water inlet pipe 39, and the mixed water outlet pipe. 40 is also connected and fixed to each other by a screw structure or the like. Further, each of the cold water passage pipe 37, the cold water branch pipe 38, the hot water introduction pipe 39, and the mixed water outlet pipe 40 is housed and fixed in the case 35 by a clamp 55 provided on the bottom surface portion 35 a of the case 35. Has been.

  The input temperature sensor 32 is, for example, a well-known thermistor type temperature sensor, and a peripheral wall near the one end portion 37 a of the cold water passage pipe 37 so that a temperature detecting portion provided at the tip of the input temperature sensor 32 touches water flowing through the cold water passage pipe 37. It is buried in. The input temperature sensor 32 detects the temperature of the water flowing through the cold water passage pipe 37 and outputs a signal corresponding to the detected temperature. The input temperature sensor 32 is electrically connected to a terminal fitting (not shown) included in the connector 36 via the lead wire 32a. The input temperature sensor 32 may be embedded in the peripheral wall near the other end 37b of the cold water passage pipe 37. If the temperature of the water flowing through the cold water passage pipe 37 can be detected, the input temperature sensor 32 is embedded (arranged). The location is arbitrary.

  The output temperature sensor 33 is the thermistor type temperature sensor that is the same as the input temperature sensor 32, and the peripheral wall of the mixed water outlet pipe 40 so that the temperature measuring part provided at the tip thereof touches the water flowing through the mixed water outlet pipe 40. It is buried in. The output temperature sensor 33 detects the temperature of the mixed water flowing through the mixed water outlet pipe 40 and outputs a signal corresponding to the detected temperature. The output temperature sensor 33 is electrically connected to a terminal fitting (not shown) included in the connector 36 via the lead wire 33a. As the input temperature sensor 32 and the output temperature sensor 33 described above, a temperature sensor other than the thermistor type temperature sensor may be used as long as it is suitable for fluid temperature detection, such as a thermocouple temperature sensor.

  For example, a known ultrasonic flow sensor is used as the flow rate sensor 34. The flow rate sensor 34 is disposed in the mixed water outlet tube 40, detects the flow rate of water flowing through the mixed water outlet tube 40, and uses the detected flow rate. A corresponding signal is output. The flow sensor 34 is electrically connected to a terminal fitting (not shown) included in the connector 36 via the lead wire 34a. As the flow sensor 34, other than the ultrasonic flow sensor, for example, a flow sensor such as a flow sensor flow sensor or an electromagnetic flow sensor may be used as long as it is suitable for fluid flow detection.

  The connector 36 includes, for example, a synthetic resin housing 36a formed in a rectangular tube shape, and a plurality of terminal fittings (not shown) fixed in the housing 36a. The housing 36a of the connector 36 is attached to a flat plate portion 35b4 facing the flat plate portion 35b2 of the wall portion 35b with the fitting portion 36b of the mating connector facing the outside of the case 35. The connector 36 is fixed to the wall portion 35b by fixing means including a bracket and a screw (not shown) provided in the housing 36a. The connector 36 is connected to an external device such as a home display panel via a cable or the like.

  Next, the assembly procedure of the piping unit 30 described above will be described.

  First, the other end 38b of the cold water branch pipe 38 is connected to the central part 37c of the cold water passage pipe 37, the input temperature sensor 32 is attached to the cold water passage pipe 37, and the output temperature sensor 33 and the flow sensor 34 are connected to the mixed water outlet pipe. 40, after connecting one end portion 38a of the cold water branch pipe 38 to the cold water input port 31a of the mixing valve 31, and connecting one end portion 39a of the hot water introduction pipe 39 to the hot water input port 31b of the mixing valve 31 One end portion 40a of the outlet pipe 40 is connected to the mixed water output port 31c of the mixing valve 31 and fixed to each other. Then, the lead wire 32a of the input temperature sensor 32, the lead wire 33a of the output temperature sensor 33, and the lead wire 34a of the flow rate sensor 34 are respectively caulked with terminal metal fittings or soldered to be physically and electrically connected. The plurality of terminal fittings are accommodated in the housing 36a of the connector 36 and fixed.

  Then, one end 37a and the other end 37b of the cold water passage pipe 37, the other end 39b of the hot water introduction pipe 39, and the other end 40b of the mixed water outlet pipe 40 are respectively connected to the lower case 351 (that is, the case 35). ), The mixing valve 31, the cold water passage pipe 37, the cold water branch pipe 38, the hot water introduction pipe 39, and the mixed water outlet pipe 40 are respectively placed in the lower case. It is accommodated in 351 and fixed using a clamp 55 provided on the inner surface of the bottom surface portion 351a. Further, the connector 36 is attached to a predetermined portion of the wall portion 351b of the lower case 351. Then, the end portion of the wall portion 351b of the lower case 351 and the end portion of the wall portion of the upper case are overlapped with each other, and are joined and fixed by the engaging means. In this way, the mixing valve 31, the cold water passage pipe 37, the cold water branch pipe 38, the hot water introduction pipe 39, the mixed water outlet pipe 40, the input temperature sensor 32, the output temperature sensor 33, and the flow rate sensor 34 are integrated with the case 35. The piping unit 30 housed in is assembled.

  As described above, according to the present invention, since each of the input temperature sensor 32, the output temperature sensor 33, and the flow rate sensor 34 is integrally accommodated in one case 35, each of these sensors is individually installed. It is not necessary to install the case 35, and these sensors can be installed together, thereby improving the workability. Moreover, since each of the mixing valve 31, the cold water passage pipe 37, the cold water branch pipe 38, the hot water introduction pipe 39, and the mixed water outlet pipe 40 is integrally accommodated in the case 35, the solar hot water supply system with the piping unit 30 as the center. That is, a solar water heating system can be configured by connecting each of the water supply source, the solar water heater, and the water heater only to the piping unit 30. Therefore, the piping configuration is simplified. Can improve the workability. Therefore, the workability required for installation and wiring can be reduced by improving the workability, the cost of the solar hot water supply system can be reduced, and the spread thereof can be promoted.

  Moreover, since the water (hot water) supplied from the solar water heater is mixed with the water (cold water) supplied from the water supply source by the mixing valve 31, the temperature of the hot water heated by the solar water heater can be lowered. Therefore, when the upper limit temperature of water that can be supplied to the water heater is specified, the hot water and the cold water are set so that the temperature of the mixed water mixed by the mixing valve 31 is equal to or lower than the upper limit temperature. The temperature of the water supplied to the water heater can be adjusted by mixing at a ratio of Therefore, it is possible to prevent water having a temperature exceeding the upper limit temperature from being supplied to the water heater, and to prevent a failure of the water heater.

  Moreover, since the input temperature sensor 32 detects the temperature of the water flowing through the cold water passage pipe 37, that is, when water (cold water) supplied from the water supply source always flows when the hot water is generated by the solar hot water supply system, Therefore, the temperature of the water supplied from the water supply source can be accurately detected. For example, when the temperature of the water heated by the solar water heater is lower than a predetermined hot water temperature, the water heated by the solar water heater is mixed with the water supplied from the water supply source in the mixing valve 31. However, at this time, the water in the cold water branch pipe 38 connected to the cold water input port 31a of the mixing valve 31 stays in the water heater without flowing. When the input temperature sensor 32 is arranged so as to detect the temperature of the water flowing in the cold water branch pipe 38, the temperature of the water staying in the cold water branch pipe 38 is detected. There is a problem that the temperature of the water supplied from the water source cannot be accurately detected. However, in the present invention, there is no such problem, the temperature of the water supplied from the water supply source can be accurately detected, and the solar heat The amount of heat reduced in the water heater by the water heater can be accurately calculated.

  In addition, since signals output from the input temperature sensor 32, the output temperature sensor 33, and the flow rate sensor 34 are connected, a connector 36 for connecting these signals to an external device is provided. The signals output from the sensors are collected in a single connector 36. Therefore, by connecting the connector 36 and an external device such as a home display panel with a single cable composed of a plurality of conductive wires, etc. Wiring of each sensor can be facilitated, the workability can be further improved, and the number of construction steps can be reduced.

  Further, one end portion 37a of the cold water passage pipe 37 connected to the water supply source is disposed so as to protrude from the flat plate portion 35b2, and the other end portion 37b of the cold water passage pipe 37 connected to the solar water heater and the hot water introduction pipe The other end 39b of 39 is disposed so as to protrude from the flat plate portion 35b1, and the other end 40b of the mixed water outlet pipe 40 connected to the water heater is disposed so as to protrude from the flat plate portion 35b3. In other words, since each pipe line is provided so as to protrude from a different flat plate portion for each connection destination, the connection destination is not mistaken, work errors can be prevented, and workability can be improved.

  The solar water heating system 1 includes a solar water heater 10, a water heater 20, the piping unit 30, the indoor display panel 50, the cold water pipes 61A and 61B, the hot water pipe 62, and the mixed water pipe 63. A heating water pipe 64.

  The solar water heater 10 is a well-known natural circulation solar water heater that includes a heat collector 11 that takes in solar heat and heats the water, and water heated by the heat collector 11, that is, a hot water storage tank 12 that stores hot water. It is. The solar water heater 10 is installed on the roof of a sunny house or the like. The hot water storage tank 12 is provided with a water inlet 12a through which water is input and a water outlet 12b through which warmed water is output. The solar water heater 10 warms the water input from the water inlet 12 a of the hot water tank 12 by solar heat taken in by the heat collector 11 to generate hot water, and stores the hot water in the hot water tank 12. The stored hot water is output from the water outlet 12 b of the hot water tank 12 and supplied downstream of the solar water heater 10. In this embodiment, a natural circulation solar water heater is used, but is not limited to this. For example, a heat collector and a hot water tank are separately installed, and the heat collector and the hot water storage are provided. Other types of solar water heaters such as a forced circulation solar water heater that heats the water in the hot water tank by forcibly circulating a heat exchange medium between the tank and the tank may be used.

  The water heater 20 is a known gas water heater that includes, for example, a gas burner and a heat exchanger, and generates heated water (that is, hot water) having a predetermined (that is, set) temperature. The water heater 20 is provided with a water inlet 20a through which water is input and a water outlet 20b through which heated water (hot water) is output. The water heater 20 heats the water input from the water inlet 20a with a gas burner and a heat exchanger to generate hot water having a predetermined (set) temperature, and outputs the hot water from the water outlet 20b. , Supplied downstream of the water heater 20. The water heater 20 is connected to a later-described home display board 50, and based on a control signal received from the home display board 50, the power is turned on, the power is turned off, and the temperature of the hot water to be generated is set. In this embodiment, a gas water heater is used, but the present invention is not limited to this, and other types of water heaters such as an electric water heater that heats water by electricity may be used. .

  The piping unit 30 connects a water pipe 5 as a water supply source for supplying cold water, a solar water heater 10, and a water heater 20. That is, the water pipe 5 is connected to one end 37a of the cold water passage pipe 37 of the piping unit 30 through the cold water pipe 61A. The water inlet 12a of the solar water heater 10 is connected to the other end 37b of the cold water passage pipe 37 of the piping unit 30 through the cold water pipe 61B. A water outlet 12 b of the solar water heater 10 is connected to the other end 39 b of the hot water introduction pipe 39 of the piping unit 30 through a hot water pipe 62. A water inlet 20 a of the water heater 20 is connected to the other end 40 b of the mixed water outlet pipe 40 of the piping unit 30 through a mixed water pipe 63. Further, a demanding section 6 such as a kitchen or a bath is connected to the water outlet 20 b of the water heater 20 through a heating water pipe 64. Thereby, the cold water of the water pipe 5 is supplied to the piping unit 30 and the solar water heater 10, the hot water generated by the solar water heater 10 is supplied to the piping unit 30, and the mixed water generated by the piping unit 30 is The hot water supplied to the water heater 20 and heated by the water heater 20 is supplied to the demanding section 6. Thus, each of the water pipe 5, the solar water heater 10, and the water heater 20 is disposed around the piping unit 30.

  The in-house display panel 50 is installed in a house or the like, and displays information such as gas, kerosene, and power consumption to the user, and is generated by the solar water heating system 1 (that is, the water heater 20). This is an apparatus in which various information display functions and various operation input functions are integrated. The in-home display panel 50 includes, for example, a known microcomputer (hereinafter referred to as “μCOM”) including a central processing unit (CPU), ROM, RAM, and the like, and is connected to the μCOM and connected to the μCOM. A display device (not shown) such as a liquid crystal display that displays various information based on the control signal, and an operation unit (not shown) to which various operations are input are provided. The in-home display panel 50 is connected to each of the gas meter 51, the kerosene meter 52, and the power meter 53, and receives various information on the gas usage, kerosene usage, and power usage from each of these meters. Display on the display device. The indoor display panel 50 is connected to the water heater 20, and transmits a control signal to the water heater 20 according to an operation input to the operation unit of the indoor display panel 50, for example, the water heater 20 The power is turned on and off, and the temperature setting of the hot water set in the water heater 20 is changed.

  The in-house display panel 50 is electrically connected to the piping unit 30 via a cable 54 having a connector 54a fitted to the connector 36 provided in the piping unit 30 at the end and made of a plurality of conductive wires. The signals output from the input temperature sensor 32, the output temperature sensor 33, and the flow rate sensor 34 included in the piping unit 30 are input to the home display panel 50, that is, μCOM. The in-home display panel 50 corresponds to an external device connected to the piping unit 30.

The μCOM CPU included in the in-home display panel 50 obtains the temperature of the cold water input to the mixing valve 31 from the signal output from the input temperature sensor 32, and from the signal output from the output temperature sensor 33, The temperature of the output mixed water is determined, and the flow rate (integrated flow rate) of the mixed water output from the mixing valve 31 is determined from the signal output from the flow rate sensor 34. And when the fluctuation | variation of the flow rate of mixed water (namely, flow of mixed water) is detected, the temperature of cold water is Tc [° C.], the temperature of mixed water is Tm [° C.], the flow rate of mixed water is F [L], Assuming that the calorific value conversion coefficient C,
Q = (Tm−Tc) × F × C / 1000 [MJ] (1)
Thus, the amount of heat Q obtained by the solar water heater 10, that is, the amount of heat required to generate hot water that can be reduced in the water heater 20 by the solar water heater 10 is calculated. As an example, the flow rate F is 1 L of water = 1 kg, and the calorific value conversion coefficient C indicates the specific heat of water, and C = 1 [kcal / kg ° C.] = 4.18605 [kJ / kg]. K].

Then, the CPU of μCOM has the following equation when the heat quantity is Q [MJ] and the total calorific value of the gas is H [MJ / Nm ³ ]:
V = Q / H [Nm ³ ] (2)
Thus, the use volume V of the gas required to generate hot water that can be reduced in the hot water heater by the solar water heater 10 is calculated. As an example, the total calorific value H1 per unit usage volume of city gas is 46.08 [MJ / Nm ³ ], and the total calorific value H2 per unit usage volume of propane gas is 101.38 [MJ]. / Nm ³ ].

Then, the CPU of μCOM has the following equation, where the gas usage volume is V [Nm ³ ] and the gas usage fee per unit usage volume is B [yen / Nm ³ ]:
Y = V × B [yen / Nm ³ ] (3)
Thus, the gas usage fee Y (that is, the amount of money) required to generate hot water that can be reduced in the hot water heater by the solar water heater 10 is calculated. As an example, the gas usage fee Y1 per unit usage volume of city gas is 153 [yen / Nm ³ ], and the total calorific value Y2 per unit usage volume of propane gas is 385 [yen / Nm ³ ]. It is.

Furthermore, the CPU of μCOM is assumed that the gas use volume is V [Nm ³ ], the carbon dioxide emission per unit use volume is E [kgCO ₂ / Nm ³ ], and the gas combustion efficiency in the water heater is k. The formula of
X = V × E × k [kgCO ₂ ] (4)
Thus, the carbon dioxide emission amount X discharged with the production of hot water that can be reduced in the water heater by the solar water heater 10 is calculated. As an example, the carbon dioxide emission E1 per unit use volume of city gas is 2.355 [kgCO ₂ / Nm ³ ], and the carbon dioxide emission E2 per unit use volume of propane gas is 5. 893 [kgCO ₂ / Nm ³ ], and the gas combustion efficiency k in the water heater is 80% (general type gas water heater) to 95% (high efficiency type gas water heater).

  And on demand or in real time when the water heater 20 is used (that is, when the mixed water flows), the amount of heat Q that can be reduced, and the gas usage fee Y and carbon dioxide emissions that can be reduced as a reduction index. The quantity X is displayed on the display device. Note that μCOM included in the in-home display panel 50 corresponds to the heat amount calculation means (CPU), the reduction index calculation means (CPU), and the conversion information storage means (ROM) in the claims. It corresponds to the display means inside. Further, the above-described equations (1) to (4) and each constant are stored in the μCOM ROM, and these correspond to the conversion information in the claims.

For example, the water heater 20 is a general gas water heater that uses city gas as fuel gas, the temperature of the cold water is Tc = 20 [° C.], the temperature of the mixed water is Tm = 40 [° C.], and the flow rate of the mixed water is F = 50 [L], and assuming that the combustion efficiency of the gas in the water heater 20 is k = 80%, the reduced heat quantity Q, gas use volume V, gas use fee Y, and carbon dioxide emission amount X are
Quantity of heat Q = (40−20) × 50 × 4.186605 / 1000 = 4.18605 [MJ]
Gas use volume V = 4.18605 × 46.08 = 0.0908 [Nm ³ ]
Gas charge Y = 0.0908 × 153 = 13.89 [yen]
Carbon dioxide emission amount X = 0.0908 × 2.355 × 0.80 = 0.171 [kg]
It becomes.

  Moreover, instead of using the above-described equations (2) to (4), the μCOM ROM shows the relationship between (A) the amount of heat and the volume of gas used to obtain the amount of heat with the water heater 20. A gas use volume-money conversion table, and (C) a gas use volume showing the relationship between a heat quantity-gas use volume conversion table, (B) a gas use volume, and a charge (amount) corresponding to the gas use volume. It is also possible to store a gas use volume-carbon dioxide emission conversion table indicating the relationship between the carbon dioxide emission amount and the carbon dioxide emission amount, and obtain the reduced charge and carbon dioxide emission amount using these tables. In that case, the CPU of μCOM applies the amount of heat calculated using the above equation (1) to the above-described heat amount-gas use volume conversion table to obtain the gas use volume with respect to the heat amount. Apply the above-mentioned gas volume-to-charge conversion table to find the reduced charge. Moreover, the gas use volume with respect to the said calorie | heat amount is applied to a gas use volume-carbon dioxide emission conversion table, and the carbon dioxide emission which has been reduced is obtained. In this case, the heat amount-gas use volume conversion table, the gas use volume-money conversion table, and the gas use volume-carbon dioxide emission conversion table correspond to the conversion information in the claims.

  Next, an example of the operation | movement concerning this invention in the solar-powered hot-water supply system 1 mentioned above is demonstrated.

  First, the water heater 20 is turned on by operating the home display panel 50. At this time, the temperature (for example, 60 degreeC) of the hot water produced | generated in the water heater 20 is preset. And a faucet etc. are opened in the demand part 6, and hot water begins to flow toward the demand part 6 from the water heater 20. FIG. Then, cold water from the water pipe 5 and hot water from the solar water heater 10 are respectively introduced into the piping unit 30, and in the mixing valve 31, cold water and hot water are brought to a predetermined temperature (for example, 40 ° C.) Mixed water is generated by mixing at a predetermined ratio. Then, the mixed water is supplied to the hot water heater 20, and the mixed water is heated in the hot water heater 20 to generate hot water having a set temperature, which is supplied to the demanding unit 6.

  When the flow rate sensor 34 detects the flow of the mixed water (that is, the generation of the mixed water), the μCOM of the home display panel 50 detects the temperature of the cold water input to the piping unit 30 and the mixed water output from the piping unit 30. The amount of heat required for the production of hot water reduced in the hot water heater 20 by the solar water heater 10 is calculated based on the temperature of the water and the flow rate of the mixed water output from the piping unit 30. The gas usage volume, gas usage fee (amount), and carbon dioxide emission are calculated, and the heat, gas usage fee, and carbon dioxide emission are integrated and stored. Thereafter, when an operation for requesting the display of the amount of heat and the amount of money is input to the home display panel 50, the stored heat amount, the gas usage fee, and the carbon dioxide emission amount are displayed on the home display panel 50. Display on the device. Alternatively, when the water heater 20 is used (that is, when the mixed water flows), the accumulated heat amount, gas usage fee, and carbon dioxide emission amount may be displayed in real time.

  As described above, according to the present invention, each of the input temperature sensor 32, the output temperature sensor 33, and the flow rate sensor 34 is integrally accommodated in one case 35 in the piping unit 30. There is no need to install each of them individually, and by installing the case 35, these sensors can be installed together, and the workability can be improved. Moreover, since each of the mixing valve 31, the cold water passage pipe 37, the cold water branch pipe 38, the hot water introduction pipe 39, and the mixed water outlet pipe 40 is integrally accommodated in the case 35, the solar hot water supply system with the piping unit 30 as the center. 1, that is, the solar water heater system 1 can be configured by connecting each of the water pipe 5, the solar water heater 10, and the hot water heater 20 only to the piping unit 30. The piping configuration can be simplified and the workability can be improved. Therefore, by improving the workability, it is possible to reduce the number of installation man-hours required for installation and wiring, to reduce the cost of the solar hot water supply system 1, and to promote its spread.

  Moreover, since the water (hot water) supplied from the solar water heater 10 is mixed with the water (cold water) supplied from the water pipe 5 by the mixing valve 31, the temperature of the hot water heated by the solar water heater 10 is lowered. Therefore, when the upper limit temperature of the water that can be supplied to the water heater 20 is specified, the temperature of the mixed water mixed by the mixing valve 31 is less than the upper limit temperature. The temperature of the water supplied to the water heater 20 can be adjusted by mixing cold water at a predetermined ratio. Therefore, it is possible to prevent water having a temperature exceeding the upper limit temperature from being supplied to the water heater, thereby preventing a failure of the water heater 20.

  Further, since the input temperature sensor 32 detects the temperature of the water flowing through the cold water passage pipe 37, that is, the location where water (cold water) supplied from the water pipe 5 always flows when hot water is generated by the solar hot water supply system 1. Since the temperature of the water is detected by this, the temperature of the water supplied from the water pipe 5 can be accurately detected. For example, when the temperature of water (hot water) heated by the solar water heater 10 is lower than a predetermined hot water temperature, the hot water is not mixed with cold water in the mixing valve 31 and is directly supplied to the water heater 20. At this time, the water in the cold water branch pipe 38 connected to the cold water input port 31a of the mixing valve 31 does not flow but stays inside. When the input temperature sensor 32 is disposed so as to detect the temperature of the water flowing in the cold water branch pipe 38, the temperature of the water staying in the cold water branch pipe 38 is detected. There is a problem that the temperature of the water supplied from the pipe 5 cannot be detected accurately. In the present invention, there is no such problem, and the temperature of the water supplied from the water pipe 5 can be detected accurately. The amount of heat that can be reduced in the water heater 20 by the solar water heater 10 can be accurately calculated.

  In the piping unit 30, signals output from the input temperature sensor 32, output temperature sensor 33, and flow rate sensor 34 are connected, and a connector 36 for connecting these signals to external devices. Therefore, the signals output from each sensor are collected in one connector 36. Therefore, the cable 36 can be easily connected to each other by connecting the connector 36 and the in-house display panel 50. In addition, the workability is further improved, and the number of construction steps can be reduced.

  In addition, the amount of heat required to generate hot water that can be reduced in the water heater 20 by the solar water heater 10 is converted into a gas usage fee (amount) and carbon dioxide emissions that can be reduced in the water heater 20 by the solar water heater 10. Therefore, the user can recognize the amount of money and the amount of carbon dioxide emissions that have been reduced (saved) by the solar water heater 10, and this will encourage energy savings such as gas and reduce the amount of carbon dioxide emissions. Can be promoted.

  In each of the above-described embodiments, the user can visually recognize the amount of heat required to generate hot water reduced by the solar water heater 10 in the water heater 20 and the gas usage fee corresponding to this amount of heat. Although it was displayed on the display device, for example, a communication function is provided in the in-house display panel 50 and connected to a telephone line or the like, and the reduced heat amount and gas usage fee are collected through the telephone line etc. You may make it transmit to. In this way, the amount of heat that has been reduced can be totaled online in real time. In addition, when a system such as a subsidy for energy consumption reduction is introduced in local governments, etc., it is possible to automatically measure each house without metering individually, so labor costs for operating the system, etc. Can save you money. In addition, “display” used in the claims means to indicate to the outside, and includes the meaning of transmitting to the aggregation center or the like as described above in addition to visual recognition. .

  Further, the home display panel 50 is provided with a communication function capable of communicating with a personal computer such as a wireless LAN, for example, and the home display panel 50 such as the amount of heat and gas used reduced as described above is installed on a personal computer installed with dedicated application software. Information displayed on the screen may be browsed. By doing in this way, it is possible to use a widespread personal computer instead of a high-performance browsing terminal dedicated to the solar hot water supply system, reduce the cost of the solar hot water supply system, and promote its spread Can do.

  In the solar hot water supply system 1 described above, as a mixing means, a well-known automatic temperature control function (thermostat type) hot and cold water mixing valve provided with a temperature sensitive spring that automatically adjusts the mixing ratio of hot water and cold water is used. However, the present invention is not limited to this. For example, an electronically controlled mixing valve that can arbitrarily change the mixing ratio of hot water and cold water by giving a control signal or the like may be used. A solar hot water supply system 2 as another embodiment of the present invention using such an electronically controlled mixing valve is shown in FIG.

  The solar hot water supply system 2 includes a piping unit 130, a solar water heater 110, a water heater 20, and a home display panel 50. In FIG. 3, the same components as those of the solar hot water supply system 1 shown in FIG.

  In place of the mixing valve 31 provided in the piping unit 30 of the above-described embodiment, the piping unit 130 receives a drive control signal, a valve body (not shown) that adjusts the mixing ratio of hot water and cold water, and receives the drive control signal. A stepping motor (not shown) as drive means for driving the valve body so that water (cold water) input to the cold water input port 31a and water (warm water) input to the hot water input port 31b are mixed at a corresponding ratio. And an electronically controlled mixing valve 131 (hereinafter referred to as a mixing valve 131).

  The stepping motor of the mixing valve 131 is connected to the in-house display panel 50 through the lead wire 131a, the connector 36, and the cable 54 in this order. The in-home display panel 50 detects the temperature of the mixed water by the output temperature sensor 33 and compares the set hot water temperature with the detected mixed water temperature. At this time, if the temperature of the mixed water is higher than the set hot water temperature, a drive control signal is transmitted to the stepping motor, and the valve body of the mixing valve 131 is set so that the temperature of the mixed water becomes the set hot water temperature. Drive. When the temperature of the mixed water is lower than the set hot water temperature, a drive control signal is transmitted to the stepping motor so that the hot water is supplied to the hot water heater 20 as it is without being mixed with the cold water. The valve body of the valve 131 is driven. Further, as another control method of the mixing valve 131 by the home display panel 50, for example, the mixing water is automatically mixed every season so that the temperature of the mixed water is low in the summer and the temperature of the mixed water is high in the winter. The mixing ratio of water may be changed. In this case, it is necessary to mount a clock function (calendar function) on the home display board 50. In the present embodiment, the mixing valve 131 is controlled from the home display panel 50. In addition to this, the stepping motor of the mixing valve 131 is connected to the water heater 20, and a drive control signal is sent from the water heater 20. By receiving, the mixing valve 131 and the water heater may be controlled in conjunction with each other. For example, the water heater 20 detects the temperature of the mixed water supplied from the piping unit 30, and when the detected temperature of the mixed water is lower than the temperature of the hot water set in the water heater 20, the temperature of the mixed water Is sent to the stepping motor of the mixing valve 131. When the detected temperature of the mixed water is higher than the temperature of the hot water set in the water heater 20, a drive control signal for lowering the temperature of the mixed water is sent. Transmit to the stepping motor of the mixing valve 131.

  The solar water heater 110 is a well-known forced circulation solar water heater, and includes a heat collector 111, a hot water tank 112, a pump 114, a solar cell 115, and a heat exchanger 116. The heat collector 111 is a member that collects solar heat, and is a thin member that can be installed on a wall surface of an apartment or the like. The hot water storage tank 112 is configured by connecting in parallel a plurality of cylindrical tanks 113 having a small diameter so that they can be installed on a veranda such as an apartment. The tank 113 is provided with a water inlet 113a through which water is input and a water outlet 113b through which warmed water is output. The water inlet 113a is connected to the other end 37b of the cold water passage pipe 37 of the piping unit 130 through the cold water pipe 61B, and the water outlet 113b is connected to the hot water introduction pipe 39 of the piping unit 130 through the hot water pipe 62. It is connected to the other end 39b. In addition, the piping unit 130 described above is accommodated in the hot water storage tank 112. In addition, each component of the piping unit 130 may be accommodated in the hot water tank 112, and the case of the hot water tank 112 may be used as the case of the piping unit. In this case, the hot water tank 112 corresponds to a piping unit. The heat exchanger 116 is an endless pipe line that is filled with a heat exchange medium. The heat exchanger 116 is disposed across the heat collector 111 and the hot water storage tank 112, and is located in the heat collector 111 and the hot water storage tank 112. The portions arranged in the are folded in a fold. The pump 114 circulates the heat exchange medium in the heat exchanger 116. The solar cell 115 generates electric power for driving the pump 114 from sunlight. The solar water heater 110 forcibly circulates the heat exchange medium in the heat exchanger 116 with the pump 114, so that the solar heat collected by the heat collector 111 is stored in the cold water stored in the hot water tank 112 (tank 113). Telling, this cold water is heated to produce hot water.

  As described above, according to the present invention, the mixing valve 131 receives the valve body, the drive control signal, and the water (hot water) and the cold water input port that are input to the hot water input port 31b at a rate corresponding to the drive control signal. A stepping motor as a driving means for driving the valve body so that the water (cold water) input to 31a is mixed, so that by supplying a drive control signal from the indoor display panel 50, solar hot water The mixing ratio of water (hot water) heated by the vessel 110 and water (cold water) supplied from the water pipe 5 can be arbitrarily changed. For example, in a configuration using a mixing valve in which the temperature of water after mixing is fixed in advance, such as a thermostatic mixing valve, water supplied from a solar water heater when hot water at 60 ° C. is required Assuming that the temperature of the mixing valve is 75 ° C. and the set temperature of the mixing valve is 40 ° C., the temperature of the water after mixing will be lowered to 40 ° C. Therefore, it is necessary to reheat to 60 ° C. with a water heater. In the configuration including the valve body and the driving means described above, the mixing ratio can be changed so that the temperature of the mixed water becomes a desired temperature (for example, 60 ° C.) Hot water having a desired temperature is obtained without heating again, and energy such as gas is not wasted, and energy (heat amount) consumed by a water heater can be reduced.

  In each of the above-described embodiments, a gas water heater is used as the water heater 20. However, the present invention is not limited to this. For example, an electric water heater may be used. In that case, it is necessary to appropriately change conversion information such as the above-described equations (1) to (4) according to the electric water heater.

  Moreover, in each embodiment mentioned above, when the hot water produced | generated with solar water heaters, such as summer, is sufficiently high temperature, the hot water from a solar water heater and the cold water from a water pipe are mixed, and it is set to a water heater. Since it is supplied, a sufficient amount of mixed water can be supplied to the water heater, and the water pressure does not drop even when a large amount of hot water is consumed in the demand department. However, when the hot water generated by the solar water heater is low in winter, etc., the hot water from the solar water heater is supplied to the water heater without being mixed by the mixing valve. The water pressure drops when a large amount of hot water is consumed at the demand department. If pressure loss due to piping, mixing valves, or the like further occurs in such a state, a sufficient amount of hot water cannot be supplied to the demand section. Therefore, in the present invention, the diameters of the hot water introduction pipe 39 and the mixed water outlet pipe 40 may be made larger than the diameter of the cold water passage pipe 37. By doing in this way, the pressure loss by piping, a mixing valve, etc. in the water which flows in the piping unit 30 can be reduced, and sufficient quantity of hot water can be supplied to a demand part.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is a front view which shows one Embodiment of the piping unit of this invention. It is a schematic structure figure showing one embodiment of the solar hot water supply system of the present invention. It is a schematic block diagram which shows other embodiment of the solar hot water supply system of this invention. It is a schematic block diagram of the conventional solar hot water supply system.

Explanation of symbols

1, 2 Solar water heating system 10, 110 Solar water heater 20 Water heater 30, 130 Piping unit 31, 131 Mixing valve (mixing means)
32 Input temperature sensor 33 Output temperature sensor 34 Flow rate sensor 35 Case 36 Connector (wiring connection)
37 Chilled water passage pipe 38 Chilled water branch pipe 39 Hot water introduction pipe 40 Mixed water outlet pipe 50 Indoor display panel (heat amount calculation means, reduction index calculation means, conversion information storage means)
54 cable

Claims (5)

A solar water heater and a water heater disposed downstream of the solar water heater, and water supplied from a water supply source is heated by the solar water heater, or the solar water heater and the water heater. When a hot water having a predetermined temperature is generated, a piping unit used in a solar hot water supply system that calculates the amount of heat that can be reduced in the hot water heater by the solar water heater,
(A) A cold water input port to which water supplied from the water supply source is input, a hot water input port to which water supplied from the solar water heater is input, water input to the cold water input port, and the hot water A mixing water output port that outputs mixed water mixed with water input to the input port at a predetermined ratio;
(B) Cold water passage where one end is connected to the water supply source and the other end is connected to a water inlet of the solar water heater, and water supplied from the water supply source flows toward the solar water heater Tube,
(C) One end is connected to the cold water input port and the other end is connected to the central portion of the cold water passage tube, and a part of the water flowing through the cold water passage tube is directed to the cold water input port. A flowing cold water branch pipe,
(D) Hot water in which one end is connected to the hot water input port and the other end is connected to the water outlet of the solar water heater, and water supplied from the solar water heater flows toward the hot water input port An introduction tube;
(E) One end is connected to the mixed water output port and the other end is connected to the water inlet of the water heater, so that water output from the mixed water output port flows toward the water heater. A mixed water outlet pipe;
(F) an input temperature sensor for detecting the temperature of water flowing through the cold water passage pipe;
(G) an output temperature sensor for detecting the temperature of the water flowing through the mixed water outlet pipe;
(H) a flow rate sensor for detecting a flow rate of water flowing through the mixed water outlet pipe;
(I) The mixing means, the cold water passage pipe, the cold water branch pipe, the hot water inlet pipe, the mixed water outlet pipe, the input temperature sensor, the output temperature sensor, and the flow rate sensor are integrally accommodated. And a piping unit, characterized in that the piping unit is provided.   A signal output from each of the input temperature sensor, the output temperature sensor, and the flow rate sensor is connected, and a wiring connection part for connecting these signals to an external device is provided. The piping unit according to claim 1, wherein   The mixing means receives the drive control signal and mixes the water input to the cold water input port and the water input to the hot water input port at a rate corresponding to the drive control signal. The piping unit according to claim 1, further comprising: a driving unit that drives the valve body. A solar water heater, a water heater disposed downstream of the solar water heater, a water supply source, the solar water heater, a piping unit connected to the water heater, and water supplied from the water source. When the hot water having a predetermined temperature is generated by being heated by the solar water heater or the solar water heater and the water heater, the amount of heat reduced in the water heater by the solar water heater is calculated. A solar water heating system comprising a calorific value calculating means,
The piping unit includes the piping unit according to any one of claims 1 to 3, and
The calorific value calculating means is detected by the temperature of the water flowing through the cold water passage pipe detected by the input temperature sensor, the temperature of the water flowing through the mixed water outlet pipe detected by the output temperature sensor, and the flow sensor. A solar hot water supply system, which is means for calculating the amount of heat reduced in the hot water heater by the solar water heater based on the flow rate of water flowing through the mixed water outlet pipe. Conversion information for converting the amount of heat that can be reduced in the water heater by the solar water heater into at least one of the amount of money that can be reduced in the water heater by the solar water heater and the amount of carbon dioxide emission is stored. Conversion information storage means;
Reduction index calculation means for calculating at least one of the amount and the carbon dioxide emission based on the conversion information stored in the conversion information storage means and the heat quantity calculated by the heat quantity calculation means When,
Display means for displaying at least one of the amount calculated by the reduction index calculation means and the carbon dioxide emission amount;
The solar hot water supply system according to claim 4, comprising:

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