JP2006046687A - Storage type electric hot and cold water mixing heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type electric hot and cold water mixing heater capable of supplying hot water at a constant temperature without using a line heater even if temperature of returning hot water is low and capable of being assembled to a circulation system even in the case that a heat pump having a high coefficient of performance (COP) is used without deteriorating its performance. <P>SOLUTION: A mixing duct 30 in an approximately cylinder shape is vertically inserted in a mixing tank 20 and hot water heated by a heat source unit 2 and cold water for temperature adjustment is mixed in the mixing duct 30. Hot water is supplied to a circulation route 40 and the returning hot water circulated from the circulation route 40 to the mixing tank 20 is heated by the hot water supplied into the mixing duct 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water storage type electric hot and cold water mixing temperature rising device used when circulating hot water after adjusting hot water boiled to a high temperature by a heat source machine to a constant temperature.

  Patent Document 1 discloses an energy-saving water heater that adjusts temperature by overflowing hot water heated to high temperature by a heat source machine into a mixing tank in a hot water heater that supplies hot water at a constant temperature.

  The water heater in Patent Document 1 relates to a sealed water heater having a heat pump as a heat source. This water heater is composed of a first hot water storage tank to which a water supply device and a heat pump are connected, and a second hot water tank to which a boiler and a hot water supply pump are connected. After being stored in one hot water tank and heated by a heat pump, it flows into the second hot water tank by overflow, and hot water is supplied from the second hot water tank. According to this water heater, since the hot water overflowing from the first hot water tank does not flow back from the second hot water tank to the first hot water tank, it is heated by the boiler even when the boiler is activated. The hot water is not reheated by the heat pump, and the performance coefficient of the heat pump is improved.

Patent Document 2 relates to a heat pump using carbon dioxide as a refrigerant. In this heat pump, while using a refrigerant of carbon dioxide, the refrigerant in the cooler is in a supercritical pressure fluid state, and the flow of the cooler and the flow of hot water for hot water supply are opposed to the cooler. By using this device, the coefficient of performance is higher than in the case of Freon-12, the temperature change can be used effectively, and it has an energy saving effect.
JP-A-4-260750 Japanese Patent No. 2548962

  When a water heater using a heat pump is used in a circulation system, a line heater as shown in FIG. 4 is required to reheat the circulated hot water. That is, in a device for mixing hot water heated to a high temperature by a heat pump serving as the heat source device 2 and supplying hot water adjusted to an appropriate temperature, when the hot water supplied is not used, it is returned to the mixing tank and circulated as hot water. . When this return hot water is lower than a certain temperature, it is not heated by a heat pump, but is reheated and circulated by the line heater 100. Conventionally, such a circulation system has been adopted.

  In Patent Document 1, a boiler is used as a line heater. In this water heater, hot water that has been heated by a heat pump is stored in a mixing tank, mixed with water to supply hot water, and a circulation path that keeps the temperature of the hot water in the mixing tank constant with a boiler. Is set. This is because heat and water and water are uniformly mixed in the mixing tank to make a constant temperature adjustment, and the temperature is adjusted by the boiler while circulating the hot water in the circulation path. However, even if the performance coefficient of the heat pump is improved by mounting the boiler in this way, the energy loss used for the boiler increases in the whole water heater.

  The heat pump of Patent Document 2 uses carbon dioxide as a refrigerant. With such a water heater using a heat pump, an energy-saving type water heater having a coefficient of performance (COP) of 3 or more is provided. However, when a water heater of a heat pump is incorporated in the circulation system, there is a system that cannot be returned to the heat pump unless the return hot water is set to 50 degrees Celsius or less. In general hot water heaters, the hot water temperature is set to a temperature of about 60 degrees Celsius, so if the temperature of the return hot water is 50 degrees Celsius or higher and lower than 60 degrees Celsius, a line heater is used to It was necessary to raise the temperature. As a result, even if a heat pump water heater having a high coefficient of performance (COP) is adopted, if this heat pump is incorporated in a circulation system, a line heater of a system different from that of the heat pump must be used. There was a disadvantage that the energy loss increased.

  Therefore, the present invention has been created to solve the above-described problems. In a water heater incorporated in a circulation system, hot water can be supplied at a constant temperature without using a line heater even if the temperature of the return hot water is low. The object of the present invention is to provide a hot water storage type electric hot and cold water mixing temperature riser that can be incorporated into a circulation system without degrading the performance even when a heat pump having a high coefficient of performance (COP) is used.

  In order to achieve the above-mentioned object, the first means in the present invention is that hot water heated by the heat source device 2 is supplied to the mixing tank 20 and mixed with water inside the mixing tank 20 to adjust the temperature and then the circulation path 40. In the hot water storage type electric hot / cold water heating device to be installed in a hot water supply circulation system in which hot water that has been supplied is circulated from the circulation path 40 to the mixing tank 20, a substantially cylindrical shape is formed inside the mixing tank 20. The mixing duct 30 is inserted vertically, and hot water heated by the heat source device 2 and water for temperature adjustment are mixed inside the mixing duct 30 to supply hot water to the circulation path 40 and to the circulation path 40. The temperature of the returned hot water circulated from the mixing tank 20 to the mixing tank 20 is increased by the hot water supplied to the mixing duct 30.

  A 2nd means uses the heat pump which uses the carbon dioxide as a refrigerant | coolant as the heat-source equipment 2 of the said hot-water supply circulation system.

  The third means uses an electric heater operating at midnight power as the heat source device 2 of the hot water supply circulation system, and provides an open hot water bath 10 adjacent to the mixing bath 20, from the lower layer of the hot water bath 10. Hot water heated by circulating through the heat source unit 2 is stored in the upper part of the hot water tank 10, and the stored hot water is provided so as to overflow from the upper part of the hot water tank 10 to the mixing duct 30 in the mixing tank 20. This is a means for solving the problem.

  According to the first aspect of the present invention, the substantially cylindrical mixing duct 30 is vertically inserted into the mixing tank 20, and the hot water heated by the heat source unit 2 and the temperature adjusting water are mixed with the mixing duct 30. When there is a hot water supply load, the hot water supplied to the mixing passage 30 is heated with the hot water supplied to the mixing duct 30 while the hot water supplied to the circulating passage 40 and hot water supplied to the mixing tank 20 is mixed. It has become possible to keep the temperature of the circulating hot water constant without requiring a line heater that has been separately provided in the past. As a result, the electricity charge used by the line heater is reduced, and the energy saving effect can be enhanced.

  Further, as described in claim 2, by using the present invention in a hot water supply hot water circulation system using carbon dioxide as a refrigerant, the heat pump having a high coefficient of performance (COP) can be incorporated into the circulation system without degrading the performance. It became possible.

  According to claim 3, an electric heater that operates at midnight power is used as the heat source device 2 of the hot water supply circulation system, an open hot water bath 10 adjacent to the mixing bath 20 is provided, and the heat source device starts from the lower layer of the hot water bath 10 2 is provided so that hot water heated by circulating through 2 is stored in the upper part of the hot water tank 10, and the stored hot water overflows from the upper part of the hot water tank 10 to the mixing duct 30 in the mixing tank 20. Therefore, the open hot water storage tank 1 composed of the hot water tank 10 and the mixing tank 20 does not cause destruction of the tank due to negative pressure as in the closed type, and cleaning of each tank is easy. In addition, since there is no line heater installed in the mixing tank 20, the piping can be installed easily. Furthermore, it is possible to use hot water supply directly from an energy saving type water heater without the need for reheating.

  Thus, according to the present invention, in a water heater incorporated in a circulation system, even if the temperature of returned hot water is low, it is possible to supply hot water at a constant temperature without using a line heater, and a heat pump having a high coefficient of performance (COP). Even when this is used, there are various effects such as being able to be incorporated into a circulation system without degrading this performance.

  In the best mode of the present invention, hot water heated with a heat pump using carbon dioxide as a refrigerant as the heat source unit 2 is supplied to the mixing tank 20. The water is mixed with water inside the mixing tank 20 and the temperature is adjusted, and hot water is supplied through the circulation path 40. A hot water supply circulation system is provided in which unused hot water supplied with hot water is circulated from the circulation path 40 to the mixing tank 20. A substantially cylindrical mixing duct 30 is inserted vertically into the mixing tank 20, hot water heated by the heat source device 2 and water for temperature adjustment are mixed inside the mixing duct 30, and the circulation Hot water is supplied to the road 40. The initial purpose is achieved by raising the temperature of the returned hot water circulated from the circulation path 40 to the mixing tank 20 with hot water supplied into the mixing duct 30.

  An embodiment of the present invention will be described below. The main configuration of the present invention mixing temperature riser is composed of a mixing tank 20, a mixing duct 30, and a water supply pipe, and is used by being mounted on a hot water supply circulation system. This hot water supply circulation system includes the heat source unit 2 and the circulation path 40 in addition to the mixed temperature raising device of the present invention. That is, hot water heated by the heat source device 2 is supplied to the mixing tank 20, mixed with water inside the mixing tank 20, and after temperature adjustment, the hot water is supplied to the water heater via the circulation path 40, and the supplied unused water is supplied. This is a hot water supply and circulation system in which warm water is heated again from the circulation path 40 and returned to the mixing tank 20 and supplied again to the circulation path 40.

  The conceptual diagram of this invention hot-water mixing temperature rising device is shown in FIG. That is, the mixing duct 30 is a substantially cylindrical body into which hot water heated by the heat source device 2 is poured. The illustrated mixing duct 30 has a wide upper portion and a lower lower portion. Hot water is poured into the upper part of the mixing duct 30 and water for adjustment of 20 degrees Celsius is poured into the mixing duct 30 and mixed with hot water of 90 degrees Celsius inside the mixing duct 30 to reach 60 degrees Celsius. It is adjusted to warm water and stored in the mixing tank 20 from the lower end of the mixing duct 30. The hot water of 60 degrees Celsius is supplied from the circulation path 40 to each water heater. And the warm water which was not used will return to the mixing tank 20 from the circulation path 40 again. The return hot water is heated to 60 degrees Celsius with hot water supplied into the mixing duct 30 and supplied again from the circulation path 40 to each hot water heater.

  That is, hot water is poured into the mixing duct 30 shown in FIG. 1 by opening the hot water solenoid valve 7. On the other hand, when the water supply electromagnetic valve 4 is opened, water flows in through the flow rate adjusting valve 5 and mixes with hot water. The flow rate adjusting valve 5 automatically controls the flow rate of the feed water according to the temperature sensed by the temperature sensor 24 to adjust the temperature of the hot water in the mixing tank 20. In particular, the flow rate regulating valve 5 functions to keep the return hot water returned from the circulation path 40 to the mixing tank 20 at 60 degrees Celsius.

  Table 1 shows the mixing tank 20 when the mixing duct 30 and the flow rate adjusting valve 5 are used and stored in the mixing tank 20 and when the mixing duct 30 and the flow rate adjusting valve 5 are not used. It shows the temperature change. When the mixing duct 30 and the flow rate adjusting valve 5 of the present invention are used, the hot water can be discharged at a stable temperature of 60 degrees Celsius as shown in FIG. Moreover, in the case where hot water and feed water were mixed in the mixing tank 20 without using the mixing duct 30, as shown in (B), the hot water temperature from the mixing tank 20 varied greatly. Thus, by using the mixing duct 30 and the flow rate adjusting valve 5, the temperature of the hot water can be adjusted extremely accurately.

  Next, based on FIG. 2, the Example of the hot water supply circulation system which uses the heat pump 50 which uses a carbon dioxide as a refrigerant | coolant is demonstrated to the heat source apparatus 2 of a hot water supply circulation system. In this embodiment, hot water of 90 degrees Celsius heated by the heat pump 50 is poured directly into the mixing duct 30 and mixed with temperature adjusting water directly connected to the water supply in the mixing duct 30. Further, when raising the temperature of the return hot water, the temperature is adjusted by stopping the temperature adjustment water and increasing the hot water of 90 degrees Celsius. The illustrated heater 21 is a spare heater 21 when hot water of 90 degrees Celsius heated by the heat pump 50 cannot be used, and is not normally used. In this embodiment, the higher the coefficient of performance (COP) of the heat pump 50 is, the more energy saving effect can be reflected. Therefore, by using the heat pump 50 of COP3 or higher that is currently realized, an extremely high energy saving effect can be realized. Can do.

  Next, based on FIG. 3, the Example of the hot-water supply circulation system which uses the electric heater 60 which operate | moves with midnight electric power for the heat-source equipment 2 of a hot-water supply circulation system is demonstrated. In this embodiment, an open hot water tank 10 adjacent to the mixing tank 20 is provided, and an open hot water tank 1 composed of the hot water tank 10 and the mixing tank 20 is used. And while the hot water circulated through the heat source machine 2 from the lower layer part of the hot water tank 10 is stored in the upper part of the hot water tank 10, the stored hot water is stored in the mixing tank 20 from the upper part of the hot water tank 10. It is provided so as to overflow into the mixing duct 30.

  The hot water tank 10 stores hot water of 90 degrees Celsius, which is heated by circulating through the heat source device 2 and used as effective hot water. This hot water is supplied to the heat source unit 2 from the lower layer portion of the hot water bath 10 and is returned to the upper layer portion of the hot water bath 10 after heating. The effective hot water that can be used as hot water is from the upper tank portion of the hot water bath 10. It is stored in order over the lower layer. The hot water tank 10 is set to at least a capacity of about 250 to 300 L, and the effective hot water is set to be stored in the upper 70% to 80% inside the hot water tank 10. By setting the effective hot water storage amount in this way, it is possible to provide a water heater that is suitable for use in an office or a general household.

  Then, hot water adjusted to a constant temperature, for example, 60 degrees Celsius, is stored in the mixing tank 20 through the mixer 30 and hot water is supplied from the mixing tank 20 to each water heater through the circulation path 40. . The return hot water returned from the circulation path 40 is returned to the mixing tank 20, and the hot water from the hot water tank 10 is injected into the mixer 30 to raise the temperature. In addition, an auxiliary heater 21 is provided in case hot water is not sufficiently stored in the hot water tank 10, but this heater 21 is not normally used.

  When water is supplied to the hot water bath 10, a water supply duct 11 is used (see FIG. 3). The water supply duct 11 has a substantially cylindrical shape and is vertically inserted into the hot water tank 10, and the water poured into the upper part of the water supply duct 11 flows from the lower end of the water supply duct 11 to the hot water tank. Water is supplied to 10 lower layers. In the hot water tank 10, effective hot water that can be used as hot water is stored in the upper layer portion, and low-temperature water before being heated in the lower layer portion is stored. Therefore, by using the water supply duct 11 to supply water to the lower layer portion of the hot water bath 10, the convection phenomenon caused by the temperature difference inside the hot water bath 10 can be suppressed as much as possible. As a result, it becomes possible to supply water without lowering the temperature of the effective hot water stored in the upper layer portion of the hot water bath 10.

  The mixing tank 20 is stored while adjusting the temperature of the hot water that has overflowed from the upper layer of the hot water tank 10 to the mixing tank 20, and is partitioned from the hot water tank 10 through the partition of the hot water tank 1. Since the high-temperature hot water tank 10 and the low-temperature mixing tank 20 are adjacent to each other at the partition portion, heat exchange may occur in the partition portion. For this reason, a heat insulating material is provided in the partition portion to prevent heat exchange (not shown).

  Note that the present invention is not limited to the illustrated example, and the design change and temperature setting of each component can be arbitrarily changed, and the application can be freely changed without departing from the scope of the present invention. It can be done.

It is the schematic which shows one Example of this invention hot-water mixing temperature rising device. It is the schematic which shows one Example of a circulation system. It is the schematic which shows the other Example of a circulation system. It is the schematic which shows the conventional circulation system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heat source machine 3 Pressure reducing valve 4 Solenoid valve for water supply 5 Flow regulating valve 6 Circulation pump 7 Solenoid valve for hot water 10 Hot water tank 11 Water supply duct 20 Mixing tank 21 Heater 22 Overflow port 23 Water level electrode 24 Temperature sensor 30 Mixing duct 31 Mixing plate 40 Circuit 50 Heat pump 60 Electric heater 100 Line heater

Claims (3)

  Hot water heated by a heat source device is supplied to the mixing tank, mixed with water inside the mixing tank, and after adjusting the temperature, hot water is supplied in the circulation path, and unused hot water supplied is circulated from the circulation path to the mixing tank. In the hot water storage type electric hot and cold water mixing temperature riser to be installed in the hot water supply circulation system, a substantially cylindrical mixing duct is vertically inserted inside the mixing tank, hot water heated by the heat source device, and temperature adjustment A hot water storage type electric system characterized in that water is mixed inside a mixing duct and hot water is supplied to the circulation path, and the return hot water circulated from the circulation path to the mixing tank is heated with hot water supplied to the mixing duct. Hot water mixing temperature riser.   The hot water storage type hot and cold water mixing temperature riser according to claim 1, wherein a heat pump using carbon dioxide as a refrigerant is used as a heat source device of the hot water supply circulation system. As a heat source device of the hot water circulation system, an electric heater that operates at midnight power is used, an open hot water bath adjacent to the mixing bath is provided, and the hot water heated by circulating the heat source device from the lower layer of the hot water bath Is stored in the upper part of the hot water tank, and the hot water stored in the hot water tank is provided so as to overflow from the upper part of the hot water tank to the mixing duct in the mixing tank.

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