JPH0545862B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat pump water supply system, which is used in hot water supply equipment for housing complexes, business hotels, etc., and is equipped with two hot water storage tanks and two heat pumps.

[Conventional technology]

Figure 5 shows a conventional heat pump water heater of this kind, which is described in the catalog (Mitsubishi Electric Air-Cooled Heat Pump Chiller, Sunny Pack Q <Hot Water Dedicated System> March 1984). In the figure, 41 is an open type. Hot water storage tank, 42 is a heat pump water heater, 43 is piping from the hot water storage tank 41 to the heat pump water heater 42, 44 is a heat pump water heater 42
45 is a hot water circulation pump provided in the middle of the piping 43, 46 is an outgoing hot water supply pipe, 47 is a faucet for hot water supply, 48 is a return pipe for hot water supply, 49 is a hot water circulation pump for hot water supply, and 50 is a control 51 and 52 are electric two-way valves and electromagnetic valves controlled by the controller 50, 53 is a water supply pipe, and 54 is a water level detector for the hot water tank 41.

In the water heater described above, when hot water is supplied from the faucet 47, a signal from the water level detector 54 causes the solenoid valve 52 to be opened by the controller 50, allowing water to be supplied from the water supply pipe 53. The amount of water supplied is adjusted so that the outlet temperature of the heat pump water heater 42 is constant. As a result, the water temperature in the hot water tank 41 is always kept constant,
Provided for hot water supply. Further, a hot water circulation pump 49 is constantly operated in the forward and return piping 46, 47 on the hot water supply load side to circulate hot water.

As described above, in a general heat pump water heater with a simple system, even if a failure occurs, the location of the failure can be immediately identified, so there is no need to provide an expensive failure diagnosis device.

[Problem that the invention seeks to solve]

However, in the case of a complex water heating system that includes two closed hot water storage tanks and two heat pump water heaters, it is difficult to determine that the system as a whole has failed even if one component fails, and even if a failure occurs, Even if it was determined that the malfunction occurred, it was difficult to determine which component was malfunctioning, so there was a problem in that it was delayed for the administrator to notice the abnormality, and it also had a serious impact on the users.

This invention was made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a heat pump water heater that can immediately report system abnormalities to a manager and take appropriate measures before a serious failure occurs. With the goal.

[Means for solving problems]

The heat pump water heater according to the present invention includes a temperature sensor that detects the temperature of a high-temperature system and a low-temperature system hot water storage tank, a temperature sensor that detects the temperature in the return pipe of high-temperature water, and a temperature sensor that detects the outlet temperature of the high-temperature side and low-temperature side heat pump, respectively. It is equipped with a temperature detector, an integrated wattmeter that detects the power consumption of the high-temperature side and low-temperature side heat pumps, and a fault diagnosis device that inputs the signals of each temperature and integrated power amount and notifies the administrator of abnormalities. .

[Effect]

In this invention, if the temperature of the hot water storage tank on the low temperature side, the outlet temperature of the heat pump on the low temperature side, the increase in the proportion of power consumption on the high temperature side, etc. is determined to be abnormal based on normal values, the administrator is immediately notified. be able to.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a heat pump water heater according to the present invention. In the figure, 1 is a hot water storage tank for storing high-temperature water, 2 is a high temperature side heat pump that heats this hot water storage tank 1, and 3 is a hot water storage tank 1 and a heat pump 2.
4 is a return pipe from the heat pump 2 to the hot water tank 1, and 5 is a short-circuit pipe that connects the return pipes 3 and 4 and bypasses the hot water tank 1. , 6 is a three-way electric valve that connects the outgoing pipe 3 and the short-circuited pipe 5 and controls the inlet temperature of the heat pump 2 at a constant level, 7 is a sensor that controls the three-way electric valve 6, and 8 is a three-way electric valve 6 in the middle of the outgoing pipe 3.
and a hot water circulation pump installed between the heat pump 2 and the heat pump 2, and these constitute a high-temperature system.

9 is a hot water tank for storing low temperature water; 10 is a low-temperature side heat pump that heats the hot water tank 9; 11 is an outgoing pipe that connects the hot water tank 9 and the heat pump 10 and runs from the hot water tank 9 to the heat pump 10; 12 is a pipe from the heat pump 10 to the heat pump 10; A return pipe 13 leading to the hot water storage tank 9 is a hot water circulation pump provided in the middle of the outgoing pipe 11, and these constitute a low-temperature system.

14 is a pipe connecting the bottom of the high-temperature hot water tank 1 and the top of the low-temperature hot water tank 9; 15 is a water supply pipe that supplies water to the hot water tank 9; and 16 is a hot water supply connected to the hot water tank 1 to supply hot water to users. 17 is a faucet for supplying hot water; 18 is a return pipe for circulating the hot water in the hot water supply pipe 16 to the hot water tank 9 by a hot water circulation pump 19 to prevent it from getting cold; 30 is a hot water storage tank 9 used to control the low temperature side heat pump 10; 31 is a water temperature sensor of the hot water storage tank 1 used to control the high temperature side heat pump 2, and 32 is a water temperature sensor that controls the hot water circulation pump 19.

Next, we will discuss control. In order to maintain the water temperature in the hot water tank 9 on the low temperature side at a constant temperature, a water temperature sensor 30 is used.
In order to control the operation of the heat pump 10 on the low temperature side on and off, and to maintain the high temperature water in the hot water storage tank 1 at a constant level, the operation of the heat pump 2 on the high temperature side is controlled on and off by the water temperature sensor 31. In order to maintain the water temperature at a certain level, the hot water circulation pump 19 is controlled on and off by the water temperature sensor 32.

Further, in order to keep the outlet water temperature of the heat pump 2 on the high temperature side constant at, for example, 60°C, the opening degree of the three-way electric valve 6 is automatically controlled by a water temperature sensor 7, and the inlet water temperature is kept constant at, for example, 55°C.

The 60°C high-temperature water thus obtained is sent to the upper part of the high-temperature side hot water storage tank 1 to keep the amount of high-temperature water constant.

In this heat pump hot water system, a temperature sensor 20 detects the temperature of the high temperature side hot water storage tank 1, a temperature sensor 21 detects the temperature of the low temperature side hot water storage tank 9,
a temperature sensor 22 that detects the temperature inside the return pipe 18;
A temperature detector 23 that detects the outlet temperature of the high-temperature heat pump 2, a temperature detector 24 that detects the outlet temperature of the low-temperature heat pump 10, an integrated wattmeter 25 that detects the power consumption of the high-temperature heat pump 2, and a low-temperature heat pump 10. The temperature and integrated power consumption input signals from these and a fault diagnosis mechanism 27 stored in the internal memory are used to determine the temperature of the hot water storage tank 9 for low temperature. It is equipped with a failure diagnosis device 33 that determines that the control system using the water temperature sensor 30 has failed and is no longer able to maintain the original control temperature, and has a display mechanism 28 with an alarm device and a printing mechanism 29 as a means of reporting to the administrator. There is.

Hot water sensor 30 in the low temperature side hot water storage tank in this system
If the heat pump 10 malfunctions and attempts to control the temperature at an even lower temperature without detecting the normal control temperature (for example, 55°C), an abnormality will occur in which the heat pump 10 on the low-temperature side will not turn on even if it reaches the normal set temperature.

However, in this system, in such a case,
The operation rate of the heat pump 2 on the high temperature side increases and works to prevent the temperature of the hot water storage tank 9 on the low temperature side from dropping.
It is difficult to determine an abnormality from normal temperature measurement data. FIG. 2 shows predicted values of measurement data based on simulation of temperature and power consumption in a normal case, with time on the horizontal axis and temperature and power consumption on the vertical axis.

However, by conducting simulations for various hot water supply loads and examining the results, it was found that the temperature of the hot water storage tank 9 on the low temperature side was still somewhat lower than during normal operation. The outlet water temperature was also found to be slightly lower. FIG. 3 shows predicted values based on simulation of measured data of temperature and power consumption when the control system by the hot water sensor 30 fails, with the horizontal axis showing time and the vertical axis showing temperature and power consumption.

In addition, since the low-temperature side heat pump 10 is not turned on much, the high-temperature side heat pump 2 is turned on to compensate for this, so even though the total power consumption does not change much, the proportion of power consumption of the high-temperature heat pump is It grows quite large.

In the normal case, the power consumption of the high temperature side heat pump 2 was 291 kWh (54%), but in the case of sensor abnormality, it increased to 337 kWh (63%).

Here, based on these changes, we will explain the low temperature side hot water storage tank 9.
The purpose is to discover a failure of the internal hot water sensor 30.

The operation of this embodiment configured as described above will be explained with reference to the flowchart shown in FIG.

Incidentally, the diagnostic algorithm shown in FIG. 4 is stored inside the failure diagnosis device 27. In this figure, in step S1, the power is turned on and started.
In the next step S2, the temperature signals of each part are input, and in step S3, the integrated electric energy is detected,
If the temperature of the temperature sensor 21 is lower than the set value in step S4, it is determined in step S5 whether the temperature detector 24 of the low temperature side heat pump 10 is lower than the set value. Step S7
If this value is larger than the set value, it is determined that there is an abnormality, and an audio warning is issued in step S8.
In step S9, a message to that effect is output to the display mechanism 28 and printing mechanism 29.

If NO in steps S4, 5, or 7, the process returns to step S2 to continue temperature detection.

〔Effect of the invention〕

As described above, in the present invention, before an abnormality reaches the user, the temperature of the hot water storage tank on the low temperature side, the outlet temperature of the heat pump on the low temperature side, the increase in the power consumption ratio on the high temperature side, etc. If it is determined that there is an abnormality, it can be immediately reported to the system administrator and repaired, allowing stable operation without causing great inconvenience to hot water users. can.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a heat pump water heater according to an embodiment of the present invention, Fig. 2 is a diagram of measurement data of temperature and power consumption based on a simulation of normal operation, and Fig. 3 is a diagram of measurement data of temperature and power consumption when the control system using a water temperature sensor has failed. FIG. 4 is a control flowchart at the time of failure diagnosis, and FIG. 5 is a configuration diagram of a conventional heat pump water heater. 1... High temperature side hot water storage tank, 2... High temperature side heat pump, 3... Outgoing piping, 4... Return piping, 5... Short circuit piping, 6... Three-way electric valve, 7... Sensor, 8... Hot water circulation Pump, 9... Low temperature side hot water storage tank, 10... Low temperature side heat pump, 11, 12... Return piping, 13
... Hot water circulation pump, 14 ... Piping, 15 ... Water supply piping, 16 ... Hot water supply piping, 18 ... Return piping, 1
9... Hot water circulation pump, 20, 21, 22... Temperature sensor, 23, 24... Temperature detector, 25, 2
6... Integrating power meter, 27... Failure diagnosis mechanism, 28
... Display mechanism, 29 ... Printing mechanism, 30, 31,
32...Hot water sensor, 33...Failure diagnosis device.

Claims (1)

[Scope of Claims] 1. A hot water storage tank that stores high-temperature water, a high-temperature side heat pump that heats the hot water storage tank, an outgoing pipe that connects the hot water storage tank and the heat pump and runs from the bottom of the hot water tank to the heat pump, and from the heat pump to the hot water storage tank. Short-circuit piping that connects the return piping, outbound and return piping to bypass the hot water tank, a three-way electric valve that connects the outbound and short-circuit piping and controls the inlet temperature of the high-temperature side heat pump, a sensor that controls this three-way electric valve, In the middle of the piping, a high temperature system with a hot water circulation pump between the three-way electric valve and the high temperature side heat pump, a hot water storage tank that stores low temperature water, a low temperature side heat pump that heats this hot water storage tank, and a connection between the hot water storage tank and the low temperature side heat pump, Outgoing piping from the hot water storage tank to the low-temperature side heat pump, return piping from the heat pump to the hot water storage tank, a low-temperature system with a hot water circulation pump in the middle of the outgoing piping, the bottom of the hot-water storage tank of the high-temperature system, and the top of the hot-water storage tank of the low-temperature system. Connecting piping, water supply piping that supplies water to a low-temperature system hot water storage tank, hot water piping that is connected to a high-temperature system hot water storage tank and sends hot water to users, and return piping that carries high-temperature water so that the hot water in this hot water supply piping does not get cold. In a heat pump water heater equipped with a hot water circulation pump that circulates water to a low-temperature system hot water storage tank via a hot water storage tank, and a water temperature sensor for the hot water storage tank used to control the low-temperature side heat pump, a temperature sensor that is attached to the hot water supply piping and detects the outlet water temperature; A temperature sensor that detects the temperature of a low-temperature hot water storage tank, a temperature sensor that detects the temperature in the return pipe of high-temperature water, a temperature sensor that detects the outlet temperature of a high-temperature heat pump, and a temperature sensor that detects the outlet temperature of a low-temperature heat pump. , an integrating wattmeter that detects the power consumption of the high-temperature heat pump, an integrating wattmeter that detects the power consumption of the low-temperature heat pump, and a fault diagnosis mechanism that stores the above temperature and integrated power signals and internal memory. display mechanism with alarm device,
A heat pump water heater characterized by being equipped with a failure diagnosis device that notifies abnormalities through a printing mechanism. 2 The temperature detected by the temperature sensor of the hot water storage tank on the low temperature side and the temperature detected by the outlet temperature detector of the low temperature side heat pump are both lower than a certain set temperature A, and the power consumption HP1 of the high temperature side heat pump and the temperature detected by the low temperature side heat pump are Energy consumption of the heat pump on the high temperature side HP1 relative to the total energy consumption of the heat pump energy consumption HP2
If the ratio becomes larger than a certain setting value,
Claim 1, characterized by comprising a failure diagnosis device having a failure diagnosis function for determining that a water temperature sensor of a low-temperature hot water storage tank has failed and an abnormality has occurred in which the original control temperature cannot be maintained. Heat pump water heater.