JP2005147597A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase heating capacity per power consumption. <P>SOLUTION: This hot water supply system has: a heating system 2 heating cold water by a heating means 32 to make high temperature hot water, and storing the high temperature hot water in hot water storage tanks 3, 7; a hot water supply system 25 supplying cold water into the hot water storage tanks 3, 7, force-feeding the high temperature hot water inside the hot water storage tanks 3, 7 outside the hot water storage tanks 3, 7, mixing the high temperature hot water and the cold water to make low temperature hot water, and supplying the low temperature hot water through a faucet 26; a circulation system 35 circulating the low temperature hot water of the hot water supply system 25 through a circulation tank 36; and a circulation tank reheating system 50 heating the low temperature hot water of the circulation system 35 by the heating means 32, returning it to the circulation system 35 to keep the low temperature hot water inside the circulation system 35 a prescribed temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot water supply system, and more particularly to a hot water supply system capable of reducing heat loss in a piping path.

  In recent years, for example, heat pumps that use environmentally friendly refrigerant (CO2), can discharge hot water and are excellent in energy saving have been developed, and various hot water supply systems for business use using the heat pump as a heating source have been provided. (For example, refer nonpatent literature 1.).

  Such a heat pump type hot water supply system has a high temperature hot water by installing a heat pump, a hot water storage tank, etc. on the rooftop of an office building, an apartment house, etc., and exchanging heat between cold water from the water supply and refrigerant in the heat pump. This hot water is temporarily stored in a hot water storage tank, and then hot water is supplied from the hot water storage tank to each room and each dwelling unit through a hot water supply pipe.

  By the way, in general, the amount of hot water used varies greatly depending on the time zone such as daytime and midnight. Therefore, with a conventional hot water supply system, for example, at a hot water supply facility such as midnight where the amount of hot water used is small, the temperature of the hot water is greatly reduced while hot water (eg, about 85 ° C.) is circulated in the piping. It was supposed to be. In other words, since hot hot water is circulated in the pipe as it is from the hot water storage tank, there has been a problem that heat loss in the pipe becomes large.

In addition, due to the hot water whose temperature has dropped in the piping, an electric heater is provided in the circulation line and heating is performed to keep the temperature of the hot water constant. However, the COP (Coefficient of the amount of use of the electric heater is used. (Performance), that is, the heating capacity per power consumption deteriorates. Furthermore, since the piping system is complicated and requires a large number of valves, the cost is high and it is easily broken. Furthermore, although an electric heater is installed in the hot water tank in preparation for an emergency, the fact is that it is hardly used.
China Electric Manufacturing Co., Ltd., Ecocute (registered trademark) for business use, catalog, 2002.10.

  The present invention has been made in view of the above-described conventional problems, can reduce heat loss in piping, can be used with good efficiency, and is further heated water circulating in a circulation line. In order to maintain a constant temperature, it is not necessary to provide an electric heater or the like in the circulation line, the COP can be increased, a complicated piping system is not required, and the number of valves required is small. Further, it is an object of the present invention to provide a hot water supply system that does not require installation of an electric heater for emergency use, can reduce costs, and can increase durability.

  The present invention employs the following means in order to solve the above problems.

  The invention according to claim 1 is a system in which cold water is heated by heating means to form hot water, a heating system for storing the hot water in a hot water storage tank, and hot water stored in the hot water storage tank are pumped out of the hot water storage tank, A hot water supply system for supplying hot water through a faucet, a circulation system for circulating the hot water of the hot water supply system through a circulation tank, and the heating water in the circulation system is led to a heating system and heated by a heating means. It is characterized by comprising a circulation tank reheating system that keeps the warm water in the circulation system at a predetermined temperature by returning it.

According to the hot water supply system of the present invention, the hot water produced by the hot water supply system is circulated through the circulation system through the circulation tank, so that energy is more than necessary during a time zone such as nighttime when the amount of hot water used is small. It is not consumed and the thermal efficiency can be improved.
In addition, when the temperature of the hot water in the circulation system falls below a predetermined value, the temperature of the hot water circulating in the circulation system can be kept constant by returning to the heating system and heating the heating system and then returning to the circulation system. Therefore, it is not necessary to provide an electric heater or the like in the circulation line in order to keep the temperature of the hot water constant.

According to a second aspect of the present invention, hot water is heated to high temperature by heating the cold water by a heating means, and the hot water storage tank is configured to supply the cold water into the hot water storage tank, a heating system for storing the high temperature hot water in the hot water tank. Hot water stored in the tank is pumped out of the hot water tank, the hot water is mixed with cold water to form low-temperature hot water, and a hot water supply system for supplying the low-temperature hot water through a faucet, A circulation system that circulates the low-temperature hot water of the hot water supply system through a circulation tank, and heats the low-temperature hot water of the circulation system to the heating system and heats it with heating means. And a circulation tank reheating system for maintaining the low temperature hot water in the circulation system at a predetermined temperature by mixing with the low temperature warm water.
According to the hot water supply system of the present invention, the low temperature hot water produced in the hot water supply system is circulated through the circulation system through the circulation tank, so that the amount of hot water used is less than necessary at night and other times. Energy is not consumed and thermal efficiency can be improved.

  The invention according to claim 3 is the hot water supply system according to claim 1 or 2, wherein the heating means is a heat pump. According to the hot water supply system according to the present invention, cold water from a water supply source or hot water from a circulation system is heated to a predetermined temperature by heat exchange with a refrigerant in a heat pump.

  The invention according to claim 4 is the hot water supply system according to claim 1 or 2, wherein the heating means uses electric power, liquid fuel, or gaseous fuel as a heat source. According to the hot water supply system according to the present invention, the cold water from the water supply source or the hot water from the circulation system is heated by heating means using electric power, liquid fuel, or gaseous fuel as a heat source, so that hot water having a predetermined temperature is heated. It becomes.

  As described above, according to the hot water supply system according to the present invention, the hot water produced by the hot water supply system is circulated through the circulation system via the circulation tank, so that the time zone such as nighttime when the amount of hot water used is small. Heat loss can be reduced and hot water can be supplied efficiently.

  In addition, when the temperature of the hot water circulating through the circulation system falls below a predetermined level, the hot water is led to the heating system, heated by the heating means, and then returned to the circulation system, so that the hot water circulating through the circulation system is reduced. Since it can be maintained at a constant temperature, it is not necessary to install an electric heater or the like in order to keep the temperature of the hot water circulating in the circulation system constant, and the COP, that is, the heating capacity per power consumption can be greatly increased. .

  Further, since heat pump, liquid fuel, gaseous fuel or electric power is used as heating means of the heating system, the cold water from the water supply source or the hot water from the circulation system is heated, so that the cold water or the hot water can be efficiently heated. And COP can be greatly increased.

Hereinafter, embodiments of the present invention shown in the drawings will be described.
1 to 4 show an embodiment of a hot water supply system according to the present invention. This hot water supply system 1 includes a heating system 2, a hot water supply system 25, a circulation system 35, and a circulation tank reheating system. 50.

  As shown in FIG. 1, the heating system 2 includes first and second hot water storage tanks 3 and 7 and heating means 32 provided in series in a closed circuit, and includes two hot water storage tanks 3 and 7. Water (cold water or hot water) is circulated between the heating means 32 and the heating means 32 to heat the water (cold water or hot water) to a predetermined temperature and store hot water at a predetermined temperature in the hot water tanks 3 and 7. It is something that can be done.

  The first hot water tank 3 and the second hot water tank 7 are formed in a vertically long shape, and an inlet 4 is provided at the top of the first hot water tank 3, and the inlet 5 and the flow are at the bottom. An outlet 6 is provided, an inlet 8 and an outlet 9 are provided at the top of the second hot water tank 7, and an outlet 10 is provided at the bottom.

  The inlet 4 at the top of the first hot water tank 3 and the outlet 10 at the bottom of the second hot water tank 7 are connected via a pipe 34, and the outlet 6 at the bottom of the first hot water tank 3 The upper inlet 8 of the second hot water tank 7 is connected via a pipe 34, and a heating means 32 is provided in the middle of the pipe 34, whereby the first hot water tank 3 and the second hot water tank 3 are connected. A closed circuit in which the hot water tank 7 and the heating means 32 are connected in series via a pipe 34 is configured.

  An electric on-off valve 11 is provided at the outlet 6 at the bottom of the first hot water tank 3, and the outlet 6 at the bottom of the first hot water tank 3 is opened and closed by the operation of the on-off valve 11. An electric on-off valve 12 is provided at the upper inlet 8 of the second hot water tank 7, and the upper inlet 8 of the second hot water tank 7 is opened and closed by the operation of the on-off valve 12. In addition, you may regulate the flow direction of the water in a closed circuit using a check valve instead of both on-off valves 11 and 12. FIG.

  A water supply system 13 is connected to the inlet 5 at the bottom of the first hot water tank 3. The water supply system 13 includes a water supply source 14 such as water supply, a water supply pipe 34 connecting the water supply source 14 and the inlet 5 at the bottom of the first hot water tank 3, and a water supply source of the water supply pipe 34. 14 is composed of a pressure reducing valve 15 and a check valve 16 provided in a portion adjacent to 14. By the operation of the water supply system 13, cold water of 6 to 25 degrees C. is supplied into the first hot water tank 3 through the pressure reducing valve 15, the check valve 16, the water supply pipe 34, and the inflow port 5. The cold water supplied into the hot water tank 3 is filled into the second hot water tank 7 via the pipe 34 after filling the first hot water tank 3. In the figure, 17 and 18 are baffles.

  The second hot water tank 7 is provided with a first sensor 19, a second sensor 20, a third sensor 21, and a fourth sensor 22 in that order from the top to the bottom. 3, a fifth sensor 23 and a sixth sensor 24 are provided in that order from the top to the bottom, and the first to sixth sensors 19 to 24 provide an upper portion of the first hot water tank 3. And the temperature of the bottom part, the upper part of the 2nd hot water tank 7, the middle part, and the bottom part is detected, and the action | operation of the heating system 2 is controlled. Examples of the first to sixth sensors 19 to 24 include insertion type or surface sticking type thermostats.

  As the heating means 32, for example, a heat pump (EcoCute (registered trademark)) using CO2 gas as a refrigerant is effective. This heat pump is composed of a heat exchanger for water heating, an expansion valve, a heat exchanger for air, a compressor, a circulation pump 33, etc., and the bottom of the first hot water tank 3 on the upstream side of the heat exchanger for water heating. The outlet 6 of the second hot water tank 7 is connected to the downstream side via the on-off valve 12 and the pipe 34.

  By operating the circulation pump 33 of the heating means 32 with both the on-off valves 11 and 12 open, water (cold water) is provided between the first and second hot water tanks 3 and 7 and the heat exchanger for water heating. (Or hot water) is circulated, heat is exchanged between the water (cold water or hot water) and the refrigerant in the heat exchanger for water heating, and heat is exchanged between the refrigerant and the air in the air heat exchanger. The water (cold water or hot water) becomes high-temperature hot water at a predetermined temperature (85 degrees C). Hot hot water is stored in the first hot water tank 3 and the second hot water tank 7. The first to sixth sensors 19 to 24 detect that the hot water in the hot water storage tanks 3 and 7 is filled with hot water, whereby the operation of the heating means 32 is stopped. When the temperature of the hot water in both the hot water storage tanks 3 and 7 becomes a predetermined value or less, it is detected by the first to sixth sensors 19 to 24, and the heating means 32 is operated to supply the hot water to the predetermined temperature. Heated to temperature.

  The heating means 32 is not limited to a heat pump, and may be a heat source machine that uses electric power, liquid fuel (kerosene, etc.), or gaseous fuel (city gas, natural gas, LPG gas, etc.) as a heat source. The point is that the water (cold water or hot water) from the first and second hot water storage tanks 3 and 7 can be heated to high temperature hot water at a predetermined temperature. In addition, you may provide the heating means 32 with respect to each of the hot water storage tanks 3 and 7, the circulation tank 36, or any combination thereof separately from the example of this embodiment.

  As shown in FIG. 2, the hot water supply system 25 is connected to the first hot water tank 3, the second hot water tank 7, and the inlet 5 at the bottom of the first hot water tank 3 connected in series via a pipe 34. The aforementioned water supply system 13 to be connected, the hot water supply pipe 34 connected to the outlet 9 in the upper part of the second hot water tank 7, and various faucets 26 provided at the tip of the hot water supply pipe 34 And a bypass pipe 34 for connecting between the water supply pipe 34 and the hot water supply pipe 34 of the water supply system 13.

  In this case, a proportional three-way valve 27 is provided at a connection portion between the hot water supply pipe 34 and the bypass pipe 34, and a vacuum breaking valve 28 is provided in the middle of the hot water supply pipe 34, so that the hot water supply pipe is provided. A water meter 30 is provided at a portion adjacent to the 34 faucet 26.

  In the hot water supply system 25 having such a configuration, by opening the faucet 26, cold water of 6 to 25 degrees C from the water supply source 14 of the water supply system 13 is supplied with the pressure reducing valve 15, the check valve 16, the water supply pipe 34 and the flow. The hot water is supplied to the bottom of the first hot water tank 3 through the inlet 5, and the hot water in the first hot water tank 3 is pushed up by the pressure of the cold water, and the hot water corresponding to the pushed-up amount is supplied to the second hot water. The hot water storage tank 7 is extruded from the outlet 9 into the hot water supply pipe 34 and mixed with the cold water supplied into the hot water supply pipe 34 via the bypass pipe 34, and has a temperature of 60 ± 5 degrees C. The water becomes low-temperature hot water, is led to the faucet 26, and hot water is supplied from the faucet 26.

  In the figure, reference numeral 31 denotes a sensor for detecting the temperature of the hot water downstream of the proportional three-way valve 27, which is supplied into the hot water supply pipe 34 via the bypass pipe 34 by a detection signal from the sensor 31. The amount of cold water to be supplied is controlled, and the temperature of the hot water flowing through the hot water supply pipe 34 is controlled.

  As shown in FIG. 3, the circulation system 35 connects the circulation pipe 34 to a downstream portion of the proportional three-way valve 27 of the hot water supply pipe 34 to form a closed circuit, and a circulation tank 36 is formed in the closed circuit. A circulation pump 41, a constant flow valve 42 and a check valve 43 are provided on the inlet side of the circulation tank 36, and a check valve 39 is provided on the outlet side of the circulation tank 36. It has been.

  The circulation system 35 operates, for example, at night when the amount of hot water supplied from the faucet 26 is small. Here, the circulating pump 41 is operated to circulate 65 ° C. hot water in the hot water supply pipe 34. The temperature of the low-temperature hot water circulated here decreases (55 ± 5 degrees C) due to heat radiation from the pipe 34 and returns to the inlet side of the circulation tank 36. The circulation system 35 can prevent energy consumption more than necessary at night when the amount of hot water used is small, and energy saving can be achieved. The circulation system 35 may be operated alone or may be operated together with the hot water supply system 25.

  The circulation tank 36 is provided with a first sensor 44, a second sensor 45, and a third sensor 46 in that order from the top to the bottom, and a circulation described later is performed by signals from these sensors 44 to 46. The tank chase system 50 is configured to operate.

  As shown in FIG. 4, the circulation tank reheating system 50 is formed by connecting the circulation tank 36 and the heating means 32 via a pipe 34 to form a closed circuit. When the low-temperature hot water circulating through the water drops below a predetermined temperature, it is detected by the first to third sensors 44 to 46, and the heating means 32 is detected by signals from the first to third sensors 44 to 46. The circulation pump 33 is operated to circulate the low-temperature hot water in the circulation tank 36 between the circulation tank 36 and the heating means 32, and in the heat exchanger for heating the water of the heating means 32, Heat exchange is performed between the low-temperature hot water and the high-temperature hot water at a predetermined temperature (85 ° C.). The high-temperature hot water is guided into the circulation tank 36 and mixed with the low-temperature hot water in the circulation tank 36. By keeping the warm water in the circulation tank 36 at a predetermined temperature Are those that form.

  In this case, electric on-off valves 51 and 52 are provided on the upstream side and the downstream side of the circulation tank 36, respectively. By operating the heating means 32 with the on-off valves 51 and 52 opened, the circulation tank 36 is operated. The hot water inside is kept at a predetermined temperature.

  In the hot water supply system according to this embodiment configured as described above, the low temperature hot water produced by the hot water supply system 25 is circulated to the circulation system 35 via the circulation tank 36, so that the amount of hot water used is low at night. Even in this time zone, it can be used efficiently without causing large heat loss.

  Further, when the temperature of the hot water circulating through the circulation system 35 falls below a predetermined level, the hot water circulating through the circulation system 35 is guided by heating to the heating means 32 of the heating system 2 and then returned to the circulation system 35. In order to keep the temperature of the hot water circulating through the circulation system 35 constant, there is no need to heat it using an electric heater or the like, and the COP is greatly increased. Can be increased.

  Furthermore, it is not necessary to provide an emergency electric heater in the first hot water tank 3 and the second hot water tank 7, thereby reducing the cost.

  Furthermore, a circulation system 35 that circulates the low-temperature hot water produced by the hot water supply system 25, and a circulation tank reheating system 50 that guides the hot water that circulates the circulation system 35 to the heating system 2 and returns it to the circulation system 35 again. 2 and the hot water supply system 25 only need to be connected, so that the piping system can be simplified and the number of required valves can be reduced. Therefore, the cost can be reduced, the breakage can be made difficult, and the durability can be greatly increased.

  In addition, since two hot water tanks, the first hot water tank 3 and the second hot water tank 7, are used, only one hot water tank is used in summer when the amount of hot water used is small. Can do. Furthermore, one hot water tank can be used for backup. The number of hot water storage tanks is not limited to two and may be three or more.

It is a systematic diagram of one Embodiment of the hot water supply system by this invention, Comprising: It is explanatory drawing of a heating system. BRIEF DESCRIPTION OF THE DRAWINGS It is a systematic diagram of one Embodiment of the hot water supply system by this invention, Comprising: It is explanatory drawing of a hot water supply system. It is a systematic diagram of one Embodiment of the hot water supply system by this invention, Comprising: It is explanatory drawing of a circulation system. It is a systematic diagram of one Embodiment of the hot water supply system by this invention, Comprising: It is explanatory drawing of a circulation tank reheating system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply system 2 Heating system 3 1st hot water tank 7 2nd hot water tank 25 Hot water supply system 35 Circulation system 36 Circulation tank 50 Circulation tank reheating system

Claims (4)

Heating the cold water with heating means to make warm water, and storing this hot water in a hot water tank,
A hot water supply system for pumping hot water stored in the hot water storage tank to the outside of the hot water storage tank, and supplying hot water through a water tap;
A circulation system for circulating the hot water of the hot water supply system through a circulation tank, and the warm water in the circulation system is returned to the circulation system by introducing the warm water of the circulation system to the heating system and heating it back to the circulation system. A hot water supply system comprising a circulation tank replenishment system that keeps in a continuous state. A heating system that heats cold water by heating means to form hot water, and stores the hot water in a hot water storage tank,
By supplying cold water into the hot water tank, hot hot water stored in the hot water tank is pumped out of the hot water tank, and the hot water is mixed with cold water to form low temperature hot water. A hot water supply system for supplying hot water via a faucet;
A circulation system that circulates the low temperature hot water of the hot water supply system through a circulation tank, and the low temperature hot water of the circulation system is led to a heating system to be heated by heating means, and the hot water is circulated. A hot water supply system comprising a circulation tank reheating system that keeps the low temperature warm water in the circulation system at a predetermined temperature by returning to the system and mixing with the low temperature warm water.   The hot water supply system according to claim 1 or 2, wherein the heating means includes a heat pump. The hot water supply system according to claim 1 or 2, wherein the heating means uses electric power, liquid fuel, or gaseous fuel as a heat source.

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