JP2009270734A - Heat pump hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an initial installation cost, an installation space and a running cost, and to effectively utilize energy by simple control. <P>SOLUTION: This heat pump hot water supply system includes closed tank 30/opened tank 60 for storing warm water from a heat source machine 20, a cold water supply pipe 40 for supplying cold water to a water heat exchanger 21, a warm water supply pipe 50 for discharging the warm water from the water heat exchanger 21 and supplying the same to the closed tank 30/opened tank 60, a plurality of flow rate adjustment valves 52 arranged in parallel on the warm water supply pipe 50, a plurality of flow channel switching valve 53 disposed at a downstream side of the flow rate adjustment valves 52, a branched pipe 80 connected to the warm water supply pipe 50 through the flow rate switch valves 53 at one end side and connected to the cold water supply pipe 40 at the other end side, the water heat exchanger 90 connected to the branched pipe 80 at a primary side, a circulation pipe 110 disposed at a secondary side of the water heat exchanger 90, and a bathtub 100 which distributes the cold water to the circulation pipe 110 and to which the warm water from the water heat exchanger 90 is supplied. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat pump hot water supply system provided with a hot water storage function and a bath warming and warming function, and particularly relates to an apparatus that can easily make effective use of energy.

  In the field of commercial hot water supply, a hot water heater (boiler) for shower hot water and a hot water heater (boiler) for heating / warming the bathtub were separately installed. When different hot water supply systems are set in this way, there is a problem that the installation cost becomes high and the installation space becomes wide. For this reason, a heat pump hot water supply system that uses a heat pump to supply hot water is known as a hot water supply system that is used in a business type that uses a large amount of hot water such as a family restaurant, an elderly welfare facility, or a business hotel (see, for example, Patent Document 1). ).

  In such a heat pump hot water supply system, a plurality of heat source units and a system tank unit are connected in parallel by a water supply pipe and a hot water supply pipe, respectively. An open tank is connected to the outlet side of the hot water supply pipe. A hot water supply pipe is further connected to the open tank via a pump, and the other end of the hot water supply pipe is connected to the bathtub so that hot water can be supplied. The bathtub is provided with a reheating pipeline and reheated by a boiler. A heater may be used instead of the boiler. Moreover, hot water may be used for floor heating instead of a bathtub.

  In such a heat pump hot water supply system, the hot water in the bathtub is replaced at a rate of about once every three days, and the other days are reheated and kept warm so as to be at an appropriate temperature by the boiler.

  A heat pump hot water supply system 200 as shown in FIGS. 2 and 3 is also known. That is, a heat pump device 210, a hot water tank 220, a heat exchanger 230, a bathtub 240, and a use terminal 250 such as a shower or a currant are connected via a pipe 260. In addition, the arrow in a figure has shown the flow direction of water or hot water.

  At night, as shown in FIG. 2, water is supplied to the heat pump device 210, heated, and hot water is stored in the hot water storage tank 220.

In the daytime, as shown in FIG. 3, hot water is supplied and the hot water in the bathtub 240 is kept warm via the heat exchanger 230. At this time, as the temperature in the hot water tank 220 decreases, the hot water in the hot water tank 220 is sent to the heat pump device 210 and recirculation heating is performed so as to maintain a constant temperature.
JP 2007-205698 A

  The heat pump hot water supply system described above has the following problems. That is, the heater for hot water supply and the heater for reheating and heat insulation for bathtubs and floor heating were separately provided, and the initial installation cost was high.

  On the other hand, a heat pump device having a tank that can be used for both hot water supply and heat insulation in order to reduce the initial installation cost by integrating the two is also known, but it is necessary to adjust the energy supplied to the heat exchanger for heat insulation. Since it is necessary to use a variable capacity pump as a circulation pump for this purpose, it is necessary to exchange temperature information and the like between the heat pump device and the heat exchanger, and the control is complicated.

  Therefore, the present invention provides a heat pump hot water supply system that can reduce the initial installation cost, installation space, and running cost by performing both functions with the same heat pump unit, and can achieve effective use of energy with simple control. The purpose is to do.

  In order to solve the problems and achieve the object, the heat pump hot water supply system of the present invention is configured as follows.

  A plurality of heat source units that generate and supply hot water in the water heat exchange unit of the heat pump hot water supply device, a sealed tank that stores the hot water generated in the water heat exchange unit, and the sealed tank connected to the sealed tank A cold water supply pipe for supplying cold water to the water heat exchange section, a hot water supply pipe for discharging hot water from the water heat exchange section and supplying it to the sealed tank, and via the sealed tank and the hot water supply pipe And an open type tank that stores hot water supplied from the sealed tank, and a plurality of flow rate control valves provided in parallel in the hot water supply pipe between the sealed tank and the open tank, A plurality of flow path switching valves provided on the downstream side of each of the flow rate control valves, a hot water supply pipe connected at one end to the open type tank and supplying hot water of the open type tank to a user terminal by a supply pump, and from the open tank A hot water tank for storing hot water to be supplied, a branch pipe having one end connected to the hot water supply pipe via the flow path switching valve and the other end connected to the cold water supply pipe, and the branch The water heat exchanger which makes the middle part of piping the primary side, and the circulation piping which sends the water or warm water of the said hot water tank to the secondary side of the said water heat exchanger are provided.

  According to the present invention, it is possible to reduce initial installation cost, installation space, and running cost, and to achieve effective use of energy with simple control.

  FIG. 1 is an explanatory diagram showing a configuration of a heat pump hot water supply system 10 according to an embodiment of the present invention. As shown in FIG. 1, the heat pump hot water supply system 10 includes eight heat source units 20 and a system tank unit 11 that generate and supply hot water in the water heat exchanger 21 of the heat pump hot water supply apparatus. The number of operating heat source units 20 is controlled by a system controller (control unit) 120 described later.

  The system tank unit 11 includes a sealed tank 30 that stores hot water generated by the water heat exchanger 21 and a cold water supply pipe that is connected to the sealed tank 30 and supplies cold water to the water heat exchanger 21. 40 and a hot water supply pipe 50 that discharges the hot water from the water heat exchanger 21 and supplies the hot water to the sealed tank 30 is provided.

  The sealed tank 30 is provided with a plurality of temperature sensors 31 in the height direction of the tank. Outputs of these temperature sensors 31 are input to the system controller 120 and adjusted by a flow rate adjusting valve 52 described later so that 65 to 70 ° C. hot water fills up to the center of the tank.

  Cold water is supplied to the cold water supply pipe 40 from an external water pipe. A pressure reducing valve 41 is provided on the inlet side of the cold water supply pipe 40.

  The supply side pipe 51 of the hot water supply pipe 50 has a branch pipe 51a branched into three. Each branch pipe 51 a is provided with a flow rate control valve 52 and a three-way valve (flow channel switching valve) 53 for switching the flow channel on the downstream side of the flow rate control valve 52. Furthermore, the downstream side of the three-way valve 53 gathers in the hot water supply branch pipe 54 and the branch pipe 80, respectively, and is connected to the open tank 60 and the water heat exchanger 90 side, respectively.

  The open tank 60 stores hot water supplied from the sealed tank 30. One end of the open tank 60 is connected to the open tank 60, and a hot water supply pipe 70 that supplies hot water from the open tank 60 to the faucet 72, the bathtub 100, and a user terminal such as a shower is provided. The hot water supply pipe 70 is provided with a pump 71 and supplies hot water to the faucet 72, the bathtub 100, the shower, and the like as necessary.

  The flow rate adjustment valve 52 has a function of adjusting the flow rate of the hot water generated by the heat source unit 20. The adjustment operation of the flow rate adjustment valve 52 is performed by the system controller 120. Connected to the three-way valve 53 are a hot water supply branch pipe 54 that supplies hot water from the hot water supply pipe 50 to the open tank 60 and a branch pipe 80 that is introduced to the primary side of the heat exchanger 90. The valve 53 has a function of selectively switching whether the hot water generated by the heat source device 20 is flowed to the hot water supply branch pipe 54 side or the branch pipe 80 side. The switching operation of the three-way valve 53 is performed by the system controller 120.

  A midway portion of the branch pipe 80 is introduced to the primary side of the water heat exchanger 90, and a primary side pump 81 is provided between the three-way valve 53 and the midway portion introduced to the water heat exchanger 90. ing. The branch pipe 80 is connected to the upstream side of the sealed tank 30 of the cold water supply pipe 40 in the system tank unit 11 after being introduced into the water heat exchanger 90 in the middle. That is, the water returned from the branch pipe 80 is supplied to the sealed tank 30. A check valve 82 is provided between them. The primary side pump 81 has a function of periodically circulating high-temperature water as a system in order to ensure the freshness of hot water in the warming and heat insulation circuit.

  In the branch pipe 80, a side where hot water is introduced from the three-way valve 53 into the water heat exchanger 90, that is, an upstream side, and a side where the water heat exchanger 90 passes through the check valve 82 and returns to the cold water supply pipe 40, that is, the downstream side. Each of these is provided with a first temperature sensor 140 and a second temperature sensor 141. The temperature detected by the first temperature sensor 140 is TW1, and the temperature detected by the second temperature sensor 141 is TW2.

  In the figure, reference numeral 100 denotes a bathtub (hot water tank), and a circulation pipe 110 is connected to the bathtub 100. The middle part of the circulation pipe 110 is provided on the secondary side of the water heat exchanger 90, and the water in the bathtub 100 or the hot water is heated by the hot water sent from the heat source unit 20 when the three-way valve 53 is switched to the branch pipe 80 side. Is done. The circulation pipe 110 is provided with a filter 111 and a secondary pump 112. The secondary pump 112 incorporates operation ON / OFF, overheating, and heat retention capacity variable control by detecting the bath temperature.

  The heat pump hot water supply system 10 configured as described above operates as follows. That is, when supplying hot water to the open-type tank 60, the system controller 120 sets the temperature and the amount of water. Each unit operates based on this setting. That is, when cold water is supplied from the cold water supply pipe 40 to each heat source apparatus 20 and each heat source apparatus 20 is driven, hot water is supplied to the sealed tank 30 via the hot water supply pipe 50 and each three-way valve 53. Hot water is also sent to. Each three-way valve 53 is switched by the system controller 120 and supplies the sent hot water to the open-type tank 60 through the hot water supply branch pipe 54. A pump 71 is driven from the open tank 60 as necessary, and hot water is supplied to the faucet 72, the bathtub 100, the shower, and the like via the hot water supply pipe 70.

  When reheating / warming the bath 100, the system controller 120 sets the hot water temperature, the start time / end time, and the switching operation of the three-way valve 53 is performed. The generated hot water is introduced into the branch pipe 80 side. The hot water introduced into the branch pipe 80 is supplied to the primary side of the water heat exchanger 90. Hot water sent to the branch pipe 80 for heating the bathtub 100 is deprived of heat in the water heat exchanger 90 and comes out at a lower temperature than before being introduced into the water heat exchanger 90. This low-temperature hot water is supplied to the sealed tank 30 via a branch pipe 80 connected to the upstream side of the sealed tank 30.

  On the other hand, the water or hot water in the bathtub 100 is supplied to the circulation pipe 110, filtered by the filter 111, and then supplied to the secondary side of the water heat exchanger 90 by the circulation pump 112. Thereby, the water or warm water in the circulation piping 110 is heated and returned in the bathtub 100. All the flow rate adjustment valves 52 are closed when the set temperature is reached.

  Inside the closed tank 30, a boundary layer of high temperature water and low temperature water is constructed at the center, but when low temperature hot water returns from the water heat exchanger 90 to the closed tank 30 via the branch pipe 80, The boundary layer is displaced from the central portion of the sealed tank 30. When the deviation of the boundary layer is sensed by the temperature sensor 31, the system controller 120 automatically controls the flow rate adjustment valve 52 and adjusts the flow rate of hot water so that the boundary layer returns to the center of the sealed tank 30. Therefore, the produced hot water can be supplied without waste.

  Furthermore, the temperature sensors 140 and 141 check the temperature of the hot hot water supplied from the heat source device 20 and the temperature of the low temperature hot water returned from the water heat exchanger 90 and input them to the system controller 120. If the temperature of the hot hot water is TW1, the temperature of the low temperature hot water is TW2, and TW2 is set to 45 ° C., for example, the following control is performed.

  When the temperature of TW2 is lower than 45 ° C., the temperature of the hot water supplied to the water heat exchanger 90 is low or the amount of hot water supplied is insufficient to set the hot water of the bathtub 100 to the set temperature. become. Therefore, the system controller 120 automatically increases the operating number of the heat source unit 20 or switches an arbitrary number of the three-way valves 53 to the branch pipe 80 side, and issues a command to open the flow rate adjustment valve 52 and increase the flow rate. As a result, the hot hot water introduced into the water heat exchanger 90 increases, and a large amount of heat moves from the primary side to the secondary side of the water heat exchanger 90, thereby increasing the temperature of the hot water in the bathtub 100. become.

  When the temperature of TW2 is higher than 45 ° C, the temperature of hot water supplied to the water heat exchanger 90 is high or the amount of hot water supplied is large in order to set the hot water of the bathtub 100 to a set temperature. Become. Therefore, the system controller 120 automatically reduces the number of operation of the heat source unit 20 or switches an arbitrary number of the three-way valves 53 to the hot water storage tank 60 side and throttles the flow rate adjusting valve 52 flowing to the remaining branch pipe 80 side to reduce the flow rate. The command is issued. As a result, high-temperature hot water introduced into the water heat exchanger 90 is reduced and less heat is transferred from the primary side to the secondary side of the water heat exchanger, so that the temperature rise of the hot water in the bathtub 100 is moderate. It will be a thing.

  Thereby, it is possible to automatically control the heat source device 20, the three-way valve 53, and the flow rate adjustment valve 52, which are necessary for warming and keeping hot water in the bathtub 100. In this embodiment, the flow rate is controlled by the flow rate adjusting valve 52 and the three-way valve 53 regardless of the primary pump in the filtration and warming device. Can do.

  In addition, when it is desired to simultaneously supply hot water to the open tank 60 and reheat / warm the tub 100, an arbitrary number of the three-way valves 53 can be opened by setting in the system controller 120. It switches so that hot water may be sent to the mold tank 60 side, and at the same time, the remaining three-way valve 53 is switched so as to send hot water to the branch pipe 80 side. This makes it possible to supply hot water to the open tank 60 and the branch pipe 80 at the same time.

  It should be noted that the amount of hot water supplied to the open tank 60 and the amount of hot water sent to the branch pipe 80 are adjusted by the flow rate adjustment valves 52 on the upstream side of each of the three-way valves 53.

  An example of the required heat retention capacity and the required heat capacity is 38.4 kW in order to raise the temperature of 22 tons of 40.5 ° C. to 42 ° C. in one hour. Considering back washing of the filter 111 using 1 ton of remaining hot water, a capacity of 40.0 kW is required to raise the temperature of 10 ton of 25 ° C. hot water to 42 ° C. in 5 hours.

  As described above, according to the heat pump hot water supply system 10, the heat generated by the heat source device 20 can be used for hot water supply to the open-type tank 60 as well as for reheating and heat insulation of the bathtub 100. The initial installation cost, installation space, and running cost can be reduced.

  Further, by switching the three-way valve 53 and adjusting the flow rate adjustment valve 52 by the system controller 120, the hot water supply to the open tank 60 and the reheating / warming of the bathtub 100 can be automatically performed. It becomes easy.

  The present invention is not limited to the above embodiment. For example, in the above-described example, the bathtub 100 is exemplified as the hot water tank, but it can also be applied to a hot water pipe for floor heating. Alternatively, 60 ° C. hot water may be supplied independently of the water heat exchanger 90, and the heat retention capability may be adjusted so that the return temperature is 45 ° C. Of course, various modifications can be made without departing from the scope of the present invention.

The figure which shows the structure of the heat pump hot-water supply system which concerns on one embodiment of this invention. Explanatory drawing which shows the night mode of a general heat pump hot-water supply system. Explanatory drawing which shows the daytime mode of the heat pump hot-water supply system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Heat pump hot water supply system, 20 ... Heat source machine, 21 ... Water heat exchange part, 30 ... Sealed tank, 40 ... Cold water supply pipe, 50 ... Hot water supply pipe, 52 ... Flow rate adjustment valve, 53 ... Three-way valve (flow path switching) Valve), 60 ... Open tank, 70 ... Hot water supply pipe, 80 ... Branch pipe, 90 ... Water heat exchanger, 100 ... Bath, 110 ... Circulation pipe, 120 ... System controller (control part).

Claims (3)

A plurality of heat source units that generate and supply hot water in the water heat exchanger of the heat pump hot water supply device;
A sealed tank for storing hot water generated in the water heat exchange unit;
A cold water supply pipe connected to the sealed tank and supplying cold water to the water heat exchange unit;
A hot water supply pipe for discharging hot water from the water heat exchanger and supplying the water to the sealed tank;
An open-type tank connected to the sealed tank via the hot water supply pipe and storing hot water supplied from the sealed tank;
A plurality of flow rate control valves provided in parallel in the hot water supply pipe between the sealed tank and the open tank;
A plurality of flow path switching valves provided on the downstream side of each flow rate control valve;
One end of the open type tank connected to the hot water supply pipe for supplying hot water of the open type tank to the user terminal by a supply pump;
A hot water tank for storing hot water supplied from the open tank;
One end side is connected to the hot water supply pipe via the flow path switching valve, and the other end side is connected to the cold water supply pipe.
A water heat exchanger having a middle part of the branch pipe as a primary side;
A circulating pipe for sending water in the hot water tank or hot water to the secondary side of the water heat exchanger;
A heat pump hot water supply system characterized by comprising: Circulating hot water is supplied from the sealed tank to the water heat exchanger, and a hot water pipe connection port that returns from the water heat exchanger to the sealed tank is located upstream of the sealed tank, and the height direction of the sealed tank The heat pump hot water supply system according to claim 1, further comprising a control unit that adjusts an opening degree of the flow rate control valve so that a boundary layer of hot water and low temperature water is formed at a central portion of the water flow. When the hot water temperature supplied from the sealed tank to the water heat exchanger is TW1, and the hot water temperature returned from the water heat exchanger to the sealed tank is TW2, the temperature of TW2 becomes a predetermined temperature. The heat pump hot water supply system according to claim 1, further comprising a control unit that switches the number of operating heat source units and the flow path switching valve.

Images