JP5076061B2 - Hot water system - Google Patents

Description

  The present invention relates to a large-capacity hot water supply system that uses a relatively large amount of hot water, such as a hospital, an elderly welfare facility, a hotel, etc., and in particular, supplies hot water from an open-type hot water storage tank to a hot water supply circulation line equipped with a hot water tap. The present invention relates to a hot water supply system capable of supplying hot water at a predetermined temperature at any time from a pipeline.

  2. Description of the Related Art Conventionally, a heat pump water heater that combines a large number of heat source machines and a sealed tank has been proposed as a hot water system used in a business type that uses a large amount of hot water, such as a family restaurant, a welfare facility for the elderly, or a business hotel.

  As shown in FIG. 8, the conventional hot water supply system 31 combines a heat source device 32 equipped with a number of heat pump hot water supply devices and a sealed tank 33 in parallel, and hot water generated by the heat source device 32 is directly supplied from a hot water tap 35. ing. Alternatively, hot water is supplied from the hot water tap 35 through the open tank 34.

  However, in the conventional hot water supply system, (1) a large installation space is required because a large number of sealed tanks are used, and (2) because the closed tank is used, it is difficult to install hot water downstairs and install on the rooftop. If the water supply circuit is used when the water supply is shut off, the sealed tank may be destroyed, the floor size that can be installed is up to 5 m, and a separate open tank 34 is required for full-scale down-floor hot water supply. In facilities that are used simultaneously, there is a problem that the amount of instantaneous hot water is insufficient, and the price as a large-capacity system increases.

  In FIG. 4 of Patent Document 1, a hot water supply system is proposed in which a sealed tank with a large number of heat source units and an open tank with an electric heater are combined in series.

However, this open-type tank has a configuration in which a hot water supply pipe to which a water tap is connected and a hot water return pipe for returning hot water that has not been used are connected. In order to maintain the temperature, the heater must always be heated, the configuration of the open tank is complicated, installation and maintenance are poor, and there is a problem in energy saving because the heater is used.
JP-A-6-18092

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a hot water supply system that is easy to install, can supply hot water with a large capacity, and is excellent in energy saving.

In order to achieve the above-described object, a hot water supply system according to the present invention includes a plurality of heat source units that generate and supply hot water with a water heat exchanger of a heat pump hot water supply device, and a water heat exchange unit of each heat source unit in parallel. connected via a water pipe to be connected, and sealed tank for storing and supplying the hot water generated by these water heat exchanger, arranged at predetermined intervals in the depth direction thereof to the sealed tank open for storing a plurality of temperature sensors for measuring the water temperature and amount of hot water storage in the sealed tank, the hot water supplied from the sealed tank connected via a water pipe with the sealed tank and the flow regulating valve A mold tank, a hot water supply line connected at one end to the open type tank and supplying hot water from the open type tank by a supply pump, and a hot water supply circuit connected to the hot water supply line and provided with a hot water tap and a circulation pump In this hot water supply circuit Zaisa is, a reheating device using a heat pump type hot water supply device for holding the hot water remaining in the circulation path to a predetermined temperature or higher, a plurality of the sealed tank and the controlling apparatus of the heat source apparatus and an open hot water storage tank A system controller that is connected to a temperature sensor and controls the whole, and the system controller performs defrosting operation by supplying hot water in the sealed tank to the water heat exchanger of the heat source unit during defrosting operation, Based on the temperature information of the temperature sensor, water lower than a predetermined temperature is prevented from flowing into the open-type hot water storage tank, and the temperature detected by the temperature sensor located at the intermediate portion in the depth direction becomes a predetermined temperature. Thus, the opening degree of the flow rate adjusting valve is controlled.

  Further, the hot water supply system according to the present invention includes a plurality of heat source units that generate and supply hot water with a water heat exchanger of a heat pump type hot water supply device, and a water heat exchange unit of each heat source unit connected in parallel. A sealed tank that is connected through a pipe and supplies and stores hot water generated by these water heat exchangers, and a hot tank that is connected to the sealed tank via a water pipe and supplied from the sealed tank is stored. An open-type tank, a hot water supply line connected at one end to the open-type tank and supplying hot water from the open-type tank by a supply pump, and a hot-water supply circulation path connected to the hot-water supply line and provided with a hot water tap and a circulation pump And a reheating device using a heat pump type hot water supply device that is interposed in the hot water supply circulation path and holds hot water staying in the circulation path at a predetermined temperature or higher.

  According to the hot water supply system according to the present invention, it is possible to provide a hot water supply system that is easy to install, can supply a large volume of hot water, and is excellent in energy saving.

  A hot water supply system according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a conceptual diagram of a hot water supply system according to the first embodiment, and FIG. 2 is a conceptual diagram of a heat source machine 2 used in this hot water supply system.

  As shown in FIGS. 1 and 2, a hot water supply system 1 according to the first embodiment includes a plurality of heat source units 2 each having a heat pump type hot water supply device that generates hot water, and hot water supply pipes for these heat source units 2. Are connected via a hot water supply line 13 so as to be in parallel, and a sealed tank 3 for supplying and storing hot water generated by exchanging heat with a water heat exchanger 2b provided in the heat source device 2, and this sealed type An open-type tank 5 connected to the tank 3 via a hot-water supply line 4 for accumulating and storing hot water supplied from the sealed tank 3, and an open-type tank connected to the open-type tank 5 at one end by a hot-water supply pump 6. A hot water supply line 7 for supplying hot water 5, a hot water supply circuit 10 provided with a number of hot water taps 8 connected to the hot water supply line 7 and a circulation pump 9, and the hot water supply circuit 10. In order to keep the hot water staying in the circulation path 10 above a predetermined temperature And a reheating device 11 using the Toponpu type hot water supply device.

  The hot water supply apparatus incorporated in the heat source device 2 is operated at a three-phase 200V, and includes a compressor 2a, a water heat exchanger 2b, a pressure reducing mechanism 2c, and a heat source side heat exchanger 2d, and the water heat exchanger 2b has a sealed type on the inlet side. The water supply line 12 connected to the tank 3 is connected to the three-way valve 2e and the pump 2f, and the outlet side is connected to the hot water supply line 13 connected to the sealed tank 3 and the three-way valve 2g. Is done. Each of the three-way valve 2e and the three-way valve 2g is normally set so that the connection state is communicated. In addition, the sealed tank 3 is connected to a water supply introduction path 14 from a water receiving tank 15 as a water source in order to supply water to the hot water supply system 1.

  As shown in FIG. 3, four water pipe connection ports are connected to the sealed tank 3. That is, the cold water supply port 3 a for communicating with the water supply introduction path 14 through the pressure reducing valve 14 a and supplying water to the hot water supply system, the cold water supply port 3 b from the sealed tank 3 to each heat source device 2, and the air from each heat source device 2 are sealed. A hot water supply port 3 c to the mold tank 3 and a hot water supply port 3 d from the sealed mold tank 3 to the open mold tank 5 are provided.

  Further, a plurality of, for example, five temperature sensors T1, T2, T3, T4, and T5 are provided in the depth direction in the sealed tank 3, and temperature information from the temperature sensors T1, T2, T3, T4, and T5 is provided. Based on the above, the hot water temperature and the amount of hot water stored in the sealed tank 3 are calculated, and the flow rate adjusting valve 13a is controlled in accordance with the amount of hot water stored to adjust the amount of hot water supplied to the open tank 5.

  As shown in FIG. 1, a hot water storage sensor for detecting the hot water temperature and the amount of hot water in the open tank 5 is provided in the open tank 5 to which hot water is sent from the sealed tank 3 through the hot water supply pipe 4. It has been.

  A number of hot water taps 8 connected to a hot water supply line 7 for supplying hot water from the open tank 5 by a hot water supply pump 6 include hot water faucets and bathtubs arranged in units of floors such as hotels and hospitals. The water taps are attached to a hot water supply circulation path 10 that is annularly piped. When the hot water of the open tank 5 is supplied to the hot water supply circulation path 10 and the hot water tap is not used, the supplied hot water is present in a stagnant state. For this reason, the temperature decreases with time, and when used, there is a problem that hot water does not come out until hot water from the open tank 5 is supplied. In the hot water supply circulation path 10, a reheating device 11 using a circulation pump 9 and a heat pump hot water supply device is interposed, and when the hot water temperature in the hot water supply circulation path 10 is detected and the temperature falls below a predetermined temperature, The circulating pump 9 is operated and controlled to be reheated by the reheating device 11. For this reason, the hot water supply circulation path 10 can be kept in a state where the required hot water temperature is always maintained, and hot water can be instantaneously supplied from the water tap.

  Further, a system controller 16 for controlling the entire hot water supply system is provided in the vicinity of the sealed tank 3, and the sealed tank 3 and the system controller 16 are housed in a housing and constitute a tank unit 17.

The system controller 16 is connected to control devices such as the heat source unit 2 , the tank unit 17 , and the open hot water storage tank 5 through a BUS connection communication line, and includes an operation switch to control the entire hot water supply system.

  In addition, the heat pump type hot water supply device incorporated in the reheating device 11 is a normal one similar to the hot water supply device of the heat source unit 2 and has a control means, all of which include a compressor, a water heat exchanger, a decompression mechanism, A heat source side heat exchanger is provided.

  Next, the boiling operation of the hot water supply system according to the first embodiment will be described.

  A case where the tapping temperature setting is 65 ° C. will be described as an example.

  As shown in FIGS. 3 and 4, the system controller 16 issues an operation command to each heat source unit 2. At this time, the flow rate adjusting valve 13a is in a closed state.

  The heat source unit 2 in the normal operation state shown in FIG. 5 is supplied with water from the sealed tank 3 to the water heat exchanger 2b through the water supply line 12, the three-way valve 2e, and the pump 2f, and is heated. 2 g of hot water boiled through the hot water supply pipe 13 is supplied to the sealed tank 3.

  In the defrosting operation state shown in FIG. 6, the three-way valve 2e and the three-way valve 2g are switched, the hot water supply device is operated as a reverse cycle, the heat source side heat exchanger 2d is operated as a condenser, and the water heat exchanger 2b is operated as an evaporator. The hot water from the sealed tank 3 is supplied to the heat source device 2 through the hot water supply line 13, the three-way valve 2g, and the pump 2f, so that the water heat exchanger 2b is heated with the hot water to be a heat source. The defrosting of the side heat exchanger 2d is promoted, and the hot water whose temperature has decreased is returned to the sealed tank 3 through the three-way valve 2e and the water supply pipe 12. In this case, hot water in the sealed tank 3 is used, but defrosting is completed in a relatively short time, so that the hot water supply system as a whole does not hinder.

On the other hand, the system controller 16 opens the flow rate adjustment valve 13a at a constant opening when the temperature of the temperature sensor T3 is T3 ≧ 65 ° C., and the flow rate adjustment valve 13a when the temperature of the temperature sensor T4 is T4 ≧ 65 ° C. Is moved in the opening direction, the flow rate adjustment valve 13a is moved in the closing direction when the temperature of the temperature sensor T2 is T2 <65 ° C., and the flow rate adjustment valve 13a is further moved when the temperature of the temperature sensor T5 is T5 ≧ 65 ° C. Is fully opened, and the flow rate adjustment valve 13a is fully closed when the temperature of the temperature sensor T1 is T1 ≦ 65 ° C.

  By such an operation, basically, the opening degree of the flow rate adjustment valve 13a is adjusted so that 65 ° C. hot water is always present at the positions T2 to T4, and all the hot water boiled by the heat source unit 2 is opened. 5, the same amount of hot water as that supplied to the sealed tank 3 can be supplied to the open tank 5.

  The hot water supplied to the open tank 5 is supplied from the hot water tap 8 via the hot water supply pump 6 and the hot water supply circulation path 10 in response to a hot water supply request for opening the hot water tap 8.

  Also, until hot water is finished and the next hot water supply request is made, hot water stays in the hot water supply circulation path 10 and when the hot water becomes lower than a predetermined temperature, the reheating device 11 is operated via the system controller 16 to heat. , Keep above the predetermined temperature.

  The hot water boiled in the heat source device 2 as described above was supplied to the sealed tank 3, and the hot water was stored in the sealed tank 3, and hot water at a predetermined temperature or higher was stored in the sealed tank 3. By the way, since the hot water is supplied to the open type tank 5 and the hot water is stored in the open type tank 5, even if the heat source unit 2 is not of a large capacity, a plurality of units can be connected in parallel according to the capacity of the system. It becomes possible to support the system. For this reason, it is possible to configure a wide-capacity system from a relatively small system such as an apartment house to a large hot water supply system such as a hotel, hospital, or factory by using a standardized heat source device. It becomes.

  In addition, since the hot water storage tank is open, it can be easily installed on the rooftop of buildings, is highly safe, and hot water can be easily supplied to each floor. Hot water can be supplied by connecting the water tap. Moreover, the hot water sent to the circulation path is always kept at a predetermined temperature or higher by a reheating device using a heat pump type hot water supply device, and the hot water coming out of the water tap can be immediately brought to a desired high temperature. Furthermore, since the heat source machine uses a heat pump type hot water supply device, it is excellent in energy saving.

  According to the hot water supply system of the present embodiment, a hot water supply system that is easy to install, can supply large-capacity hot water, and is excellent in energy saving is realized.

  A hot water supply system according to the second embodiment will be described.

  In the second embodiment, a plurality of heat source devices provided in parallel in the first embodiment are connected to a single sealed tank, whereas a sealed tank is connected corresponding to each heat source device.

  For example, as shown in FIG. 7, the hot water supply unit 21 of the second embodiment connects the plurality of heat source units 2 to the plurality of sealed tanks 22, respectively.

  By connecting multiple heat pump water heaters that combine heat source units and sealed tanks to supply hot water to open tanks, the capacity of water heaters of large capacity tanks and water heaters of small capacity tanks can be combined. It is possible to configure a large-capacity hot water supply system by combining heat pump water heaters having different capacities, and it is possible to set the system with a more detailed capacity according to demand.

  In addition, since another structure is not different from the hot water supply unit shown in FIG. 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

The conceptual diagram of the hot-water supply system which concerns on 1st Embodiment of this invention. The key map of the heat source machine used for the hot-water supply system concerning a 1st embodiment of the present invention. The conceptual diagram of the airtight tank used for the hot water supply system which concerns on 1st Embodiment of this invention. The conceptual diagram explaining the operation state of the hot water supply system which concerns on 1st Embodiment of this invention. The conceptual diagram at the time of normal operation of the heat-source equipment used for the hot-water supply system which concerns on 1st Embodiment of this invention. The conceptual diagram at the time of the defrost driving | operation of the heat-source equipment used for the hot water supply system which concerns on 1st Embodiment of this invention. The conceptual diagram of the hot-water supply system which concerns on 2nd Embodiment of this invention. The conceptual diagram of the conventional hot-water supply system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water supply system, 2 ... Heat source machine, 2b ... Water heat exchanger, 3 ... Sealed tank, 4 ... Hot water supply line, 5 ... Open tank, 6 ... Hot water supply pump, 7 ... Hot water supply line, 8 ... Hot water tap , 9 ... Circulation pump, 10 ... Hot water supply circuit, 11 ... Reheating device, 12 ... Water supply pipe, 13 ... Hot water supply pipe, 13a ... Flow rate adjusting valve, 14 ... Water supply introduction path, 14a ... Pressure reducing valve, 15 ... Receiving tank, 16 ... system controller, 17 ... tank unit

Claims (1)

A plurality of heat source units that generate and supply hot water in a water heat exchanger of a heat pump hot water supply device;
The water heat exchange unit of each heat source unit is connected via a water pipe so that it is connected in parallel, and a sealed tank that supplies and stores hot water generated by these water heat exchangers, and
Provided at predetermined intervals in the depth direction in the sealed tank, and a plurality of temperature sensors for measuring the water temperature and amount of hot water storage in the sealed tank,
An open type tank for storing hot water supplied from the closed type tank connected to the closed type tank via a water pipe provided with a flow rate adjusting valve;
One end of this open-type tank is connected to a hot water supply line for supplying hot water from the open-type tank by a supply pump,
A hot water supply circuit connected to the hot water supply line and provided with a hot water tap and a circulation pump;
A reheating device using a heat pump type hot water supply device that is interposed in the hot water supply circulation path and maintains hot water staying in the circulation path at a predetermined temperature or higher,
A system controller connected to the control device of the heat source unit and the open type hot water storage tank and a plurality of temperature sensors in the sealed tank to control the whole;
The system controller performs the defrosting operation by supplying hot water in the sealed tank to the water heat exchanger of the heat source unit during the defrosting operation, and water lower than a predetermined temperature is based on the temperature information of the temperature sensor. The opening of the flow rate adjusting valve is controlled so that the temperature detected by the temperature sensor located at the intermediate portion in the depth direction becomes a predetermined temperature, preventing the flow into the open hot water storage tank. Hot water supply system.

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