JPH0535331B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention uses an efficient heat pump as a heat source to supply hot water to apartment complexes, business hotels, etc., and also to reduce the equipment capacity. ,
The present invention relates to a heat pump water heater equipped with a hot water storage tank.

[Conventional technology]

Conventionally, heat pump water heaters used in apartment complexes and business hotels include the one shown in Figure 3 in the Mitsubishi Electric air-cooled heat pump chiller catalog (March 1984). In FIG. 3, 1 is a hot water tank, 2 is a heat pump water heater, 3 is a pipe from the hot water tank 1 to the heat pump, and 4 is a pipe from the heat pump water heater 2 to the hot water tank 1.

The piping 3 is provided with a hot water circulation pump 8 and is connected to a water supply pipe 15, and the water supply pipe 15 is provided with an electromagnetic two-way valve 24 and an electromagnetic valve 25.

Further, the water level in the hot water storage tank 1 is detected by a water level detector 26, and the detection output of this water level detector 26 is sent to a controller 23, which controls an electromagnetic two-way valve 24, an electromagnetic valve 25, The heat pump water heater 2 is also controlled by the output of the controller 23.

On the other hand, hot water supply outgoing piping 16 and hot water returning piping 18 are connected to hot water storage tank 1, hot water supplying outgoing piping 16 is provided with hot water circulation pump 19 for hot water supply, and hot water supply returning piping 18 is connected to A faucet 17 is connected.

In this heat pump water heater, when hot water is supplied, the controller 23 opens the solenoid valve 25 in response to a signal from the water level detector 26, and water supply is started. The amount of water supplied is adjusted so that the outlet temperature of the heat pump water heater 2 is constant. Therefore, the water temperature in the hot water storage tank is always kept constant and is used for hot water supply.

In addition, a hot water circulation pump 19 for hot water supply was constantly operated in the hot water supply outward piping 16 and the hot water supply return piping 18 on the hot water supply load side to circulate hot water.

[Problem that the invention seeks to solve]

As mentioned above, conventional heat pump water heaters have a high outlet temperature of around 55℃, and there is also a lot of heat loss from the hot water supply piping on the load side, so the performance is not that good and the running costs are high. It had become a thing.

This invention was made in order to solve this problem, and the heat pump system for hot water supply, the hot water storage tank, and the heat pump water heater are connected to the high temperature side, respectively.
The heat pump water heater is divided into two systems on the low temperature side, and the two heat pump water heaters are operated according to the operating schedule and the temperature control of each hot water tank, so that the heat pump water heater on the low temperature side is operated with good performance. By doing so, the objective is to provide a heat pump water heater that has high overall energy efficiency.

[Means for solving problems]

The heat pump water heater according to the present invention includes a high temperature side heat pump water heater for heating high temperature hot water stored in a high temperature side hot water storage tank, a low temperature side heat pump water heater for heating hot water stored in a low temperature side hot water storage tank, and a high temperature side heat pump water heater for heating hot water stored in a low temperature side hot water storage tank. A control means is provided to perform on/off control of the side heat pump water heater and the low temperature side heat pump water heater.

[Effect]

In this invention, when the temperature of each hot water in the hot water storage tank on the high temperature side and the hot water storage tank on the low temperature side is higher than a set value, the high temperature side heat pump water heater and the low temperature side heat pump water heater are turned off by the control means, and each hot water storage tank When the hot water in the tank is lower than the set value, the control means turns on the high temperature side heat pump water heater and the low temperature side heat pump water heater.

〔Example〕

Embodiments of the heat pump water heater of the present invention will be described below with reference to the drawings. FIG. 1 is a piping system diagram showing the configuration of one embodiment. In FIG. 1, the hot water storage tank is divided into two systems: a hot water storage tank 1 for storing high temperature water and a hot water storage tank 9 for storing low temperature water.

Along with this, the heat pump water heater is also divided into two systems: a high temperature side and a low temperature side, and the high temperature side heat pump water heater 2 heats the hot water in the hot water storage tank 1.
and a low-temperature side heat pump water heater 10 that heats the hot water in the hot water storage tank 9.

A return pipe 4 is connected between the hot water storage tank 1 and the high temperature side heat pump water heater 2, and high temperature water is supplied from the high temperature side heat pump water heater 2 to the hot water storage tank 1, and the outward pipe 3 is connected to the hot water storage tank. 1 and the high temperature side heat pump water heater 2.

A three-way electric valve 6 and a hot water circulation pump 8 are provided in the middle of this outgoing pipe 3. The temperature of this outgoing pipe 3 is detected by a temperature sensor 7, and a controller 23 using a microcomputer serves as a control means.
(hereinafter referred to as a microcomputer controller). This microcomputer controller 23 controls switching of the three-way electric valve 6.

A short-circuit pipe 5 is connected between the three-way electric valve 6 and the outgoing pipe 4. The short-circuit pipe 5 is a three-way electric valve 6
By switching, the outgoing piping 3 and the incoming piping 4 are directly connected, and the high temperature side heat pump water heater 2 is biased.

Further, the temperature of the high temperature water in the hot water storage tank 1 is detected by a temperature sensor 20, and in the same way,
The temperature of the low temperature water in the hot water storage tank 9 is detected by a temperature sensor 21.

The outputs of these temperature sensors 20 and 21 are output to a microcomputer controller 23. The microcomputer controller 23 is the temperature sensor 2
0, 21 and temperature sensors 7, 22 and the operation schedule stored in its own internal memory, the high temperature side heat pump water heater 2, the low temperature side heat pump water heater 10, the hot water circulation pump 19, and the three-way electric valve 6 are controlled. It's becoming like that.

Next, we will discuss the low temperature side system. A piping 14 connects the low temperature side hot water storage tank 9 and the high temperature side hot water storage tank 1, and a return piping 12 is connected between the hot water storage tank 9 and the low temperature side heat pump water heater 10. Piping 11 is connected. This outgoing pipe 11 is provided with a hot water circulation pump 13 .

A water supply pipe 15 is connected to the hot water storage tank 9 . On the other hand, above the hot water storage tank 1 is a hot water supply pipe 16.
A plurality of faucets 17 are attached to this pipe 16, and a return pipe 18 is connected to the lower part of the hot water storage tank 1. The return pipe 18 is equipped with the above-mentioned temperature sensor 22 and hot water circulation pump 1.
9 are arranged.

Next, the operation of this embodiment configured as described above will be explained with reference to the flowchart of FIG.

The control sequence shown in FIG. 2 is stored in the internal memory of the microcomputer controller 23. FIG. 2 shows the control sequence of the high temperature side heat pump water heater 2 and the low temperature side heat pump water heater 10. In this figure 2, the steps
In S1, the power is turned on, and in the next step S2, if the operation schedules of the high-temperature side heat pump water heater 2 and the low-temperature side heat pump water heater 10 are off, the high-temperature side heat pump water heater 2 and the low-temperature side heat pump water heater 10 are turned off. (step)
S4).

In step S2, if the operation schedule of the high-temperature side heat pump water heater 2 and the low-temperature side heat pump water heater 10 is on, the process goes to step S3, where it is determined whether the hot water temperature in the hot water storage tank is higher than the preset temperature. In step S5, the high temperature side heat pump water heater 2 and the low temperature side heat pump water heater 1 are activated.
0 turns off.

Also, if the hot water temperature in the hot water storage tank is low,
In step S6, the high temperature side heat pump water heater 2 and the low temperature side heat pump water heater 10 are turned on. In this way, the operating state of the high-temperature side heat pump water heater 2 and the low-temperature side heat pump water heater 10 returns to the original step S2, and this control is repeated.

In addition, the microcomputer controller 23 switches the three-way electric valve 6 to communicate between the hot water tank 1 and the high-temperature side heat pump water heater 2, and the hot water circulation pump 8 operates to circulate the hot water in the hot water tank 1 through the three-way electric valve 6 and hot water circulation. The water is sent to the high temperature side heat pump water heater 2 via the pump 8.

Thereby, high-temperature hot water heated by the high-temperature side heat pump water heater 2 is sent to the hot water storage tank 1 from the return pipe 4.

Further, when the three-way electric valve 6 is switched to the short-circuit pipe 5 side, the high-temperature side heat pump water heater 2 is short-circuited by the short-circuit pipe 5, and the high-temperature side heat pump water heater 2
The hot water heated in The inlet temperature becomes constant, and the high temperature side heat pump water heater 2 can generate hot water at a constant high temperature.

On the other hand, in the low temperature side system, hot water in the hot water storage tank 9 is sent to the low temperature side heat pump water heater 10 by the operation of the hot water circulation pump 13, where it is heated and returned to the return pipe 1.
The hot water is sent to the hot water storage tank 9 via the hot water tank 2.

Furthermore, hot water is sent from the hot water storage tank 9 to the hot water storage tank 1 via a pipe 14.

On the other hand, high-temperature hot water in the hot water storage tank 1 is supplied to the user from a hot water supply pipe 16 through a faucet 17, and further passes through a return pipe 18 and a hot water circulation pump 19 to the hot water storage tank 1.
Hot water returns to.

Note that the memory in the microcomputer controller 23 stores seasonal, holiday, and information regarding the operation of the high temperature side heat pump water heater 2 and the low temperature side heat pump water heater 10
The operation schedule may be stored in accordance with the magnitude and pattern of the hot water supply load, such as on weekdays.

In addition, the operation schedule stored in this memory turns on the high temperature side heat pump water heater 2 only when the temperature of the hot water storage tank 1 detected by the temperature sensor 20 is lower than a preset temperature and the operation schedule is also on. It may also be stored so as to be controlled.

Furthermore, the driving schedule stored in memory is
It may be stored so that the low-temperature side heat pump water heater 10 is turned on only when the temperature of the hot water storage tank 9 detected by the temperature sensor 21 is lower than a preset temperature and the operation schedule is also turned on.

〔Effect of the invention〕

As explained above, this invention separates the heat pump water heater and the hot water storage tank into two systems, high temperature side and low temperature side, and when the temperature of hot water in the hot water storage tank on the high temperature side and the hot water storage tank on the low temperature side is lower than the set value, respectively. The high-temperature side heat pump water heater and the low-temperature side heat pump water heater are turned on by the control means, and when the temperature is higher than the set value, the high-temperature side heat pump water heater and the low-temperature side heat pump water heater are turned off, resulting in highly efficient operation of the entire system. As a result, the temperature is maintained at an optimal setting, achieving extremely energy-efficient operation.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the heat pump water heater of the present invention, FIG. 2 is a diagram showing the control flow of the high temperature side heat pump water heater and the low temperature side heat pump water heater in the heat pump water heater of the present invention, and FIG. The figure is a diagram showing the configuration of a conventional heat pump water heater. 1, 9... Hot water storage tank, 2... High temperature side heat pump water heater, 6... Three-way electric valve, 7, 20-22...
Temperature sensor, 8, 13, 19...Hot water circulation pump, 10...Low temperature side heat pump water heater, 23...
...Microcomputer controller. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A hot water storage tank on the high temperature side for storing high temperature water, a high temperature side heat pump water heater for heating the high temperature water, a hot water storage tank on the low temperature side for storing low temperature water, and a low temperature water storage tank for heating the low temperature water. side heat pump water heater, piping connecting the hot water storage tank on the low temperature side and the hot water storage tank on the high temperature side;
A heat pump comprising a control means for controlling the operation of the high-temperature side heat pump water heater and the low-temperature side heat pump water heater on and off based on the temperature of each of the hot water storage tanks relative to the set temperature and a pre-stored operation schedule. Water heater. 2. The control means controls the magnitude of the hot water supply load depending on the season, holidays, weekdays, etc. for the operation of the high temperature side heat pump water heater, the low temperature side heat pump water heater, and the hot water circulation pump installed in the return piping of the high temperature side hot water storage tank. 2. The heat pump water heater according to claim 1, wherein the heat pump water heater stores operation schedules corresponding to the respective patterns in its own internal memory. 3 The control means turns on the heat pump water heater on the high temperature side only when the temperature detected by the temperature sensor that detects the temperature of hot water in the hot water storage tank on the high temperature side is lower than a preset temperature and the operation schedule is also on. The heat pump water heater according to claim 1, wherein the heat pump water heater is controlled so as to. 4 The control means turns on the heat pump water heater on the high temperature side only when the temperature detected by the temperature sensor that detects the temperature of hot water in the hot water storage tank on the low temperature side is lower than a preset temperature and the operation schedule is also on. The heat pump water heater according to claim 1, wherein the heat pump water heater is controlled as follows.