JPH0545863B2 - - 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 inlet and outlet temperatures of the high-temperature side and low-temperature side heat pumps, respectively. It is equipped with a temperature detector and a failure diagnosis device that inputs the above-mentioned temperature signals and notifies the administrator of abnormalities.

[Effect]

In this invention, when the inlet/outlet temperature of the high-temperature side heat pump is compared with a normal value and it is determined that there is an abnormality, the failure diagnosis device can immediately notify the administrator.

〔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, the hot water sensor 30
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 sensor 23 that detects the outlet temperature of the high temperature side heat pump 2, a temperature sensor 24 that detects the outlet temperature of the low temperature side heat pump 10, a temperature sensor 25 that detects the inlet temperature of the high temperature side heat pump 2, and an inlet of the low temperature side heat pump 10. The three-way electric valve 6 that controls the inlet temperature of the high-temperature side heat pump 2 has a malfunction. The system is equipped with a failure diagnosis device 33 that determines the above, and has a display mechanism 28 with an alarm device and a printing mechanism 29 as means for notifying the administrator.

If the flow rate distribution function of the three-way electric valve 6 that controls the inlet temperature of the heat pump 2 on the high temperature side in this system at a constant level fails and the flow rate from the short-circuit piping 5 is no longer secured, the outlet temperature of the heat pump 2 on the high temperature side will normally In order to keep the temperature constant at 60℃, the inlet temperature should be set to 55℃, for example.
Although an attempt is made to control the temperature at a constant temperature, if a failure occurs in the three-way electric valve 6 like the one considered here, the relatively low-temperature water at the bottom of the high-temperature side hot water storage tank 1 will be directly introduced into the high-temperature side heat pump 2. Therefore, it becomes impossible to control the temperature at a constant 55℃, and the outlet temperature also decreases accordingly. For this reason, the outlet temperature of the high temperature side heat pump 2 cannot be maintained at 60°C.

However, this condition occurs only at the beginning,
Hot water at a level slightly lower than 60°C accumulates in the high temperature side hot water storage tank 1 from the top, and the temperature sensor 31
Even if this hot water is stored up to a level of
Hot water at a temperature slightly lower than 0.degree. C. cannot be captured as hot water, and the high-temperature side heat pump 2 continues to operate, and is filled with hot water at this temperature. Therefore, relatively high-temperature hot water flows from the bottom of the hot water tank to the high-temperature side heat pump 2.
The water will be guided to the high temperature side heat pump 2, and as a result, hot water with a temperature higher than 60°C will accumulate.

Figure 2 shows the predicted values of measurement data by simulation of temperature and power consumption under normal conditions.
The horizontal axis shows time, and the vertical axis shows temperature and electric energy.

However, by performing simulations for various hot water supply loads and examining the results, the inlet and outlet temperatures of the high temperature side heat pump 2 are found to be higher than during normal operation.

FIG. 3 shows predicted values based on simulation of measured data of temperature and power consumption in the event that the control system using the three-way electric valve fails, with the horizontal axis representing time and the vertical axis representing temperature and power consumption.

Here, based on these changes, 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. FIG. 5 shows a determination algorithm for fault diagnosis. In this figure, in step S1, the power is turned on to start, in the next step S2, temperature signals from each part are input, and in step S3, it is determined whether the inlet temperature of the high temperature side heat pump 2 is higher than the set value A. , if the inlet temperature is higher than the set value, it is determined in step S4 whether the outlet temperature of the high temperature side heat pump 2 is higher than the set value B, and if the outlet temperature is higher than the set value,
It is determined that the three-way electric valve 6 is abnormal, and the step
In step S5, a voice warning is given, and in step S6, a message to that effect is output to the display mechanism 28 and printing mechanism 29.

If NO in steps S3 and S4, the process returns to step S2 to continue temperature detection.

〔Effect of the invention〕

As described above, in the present invention, if it is determined that the inlet/outlet temperature of the high-temperature side heat pump is abnormal compared to the normal value, the system administrator is immediately notified before the abnormality reaches the user. Since the hot water supply system can be repaired, stable operation can be performed without causing much inconvenience to users of the hot water supply system.

[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 in a normal case, and Fig. 3 is a diagram of a control system using a water temperature sensor that 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, 15 ... 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... Temperature detector, 27... Failure diagnosis device, 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 the low-temperature hot water storage tank, a temperature sensor that detects the temperature inside the return pipe of high-temperature water, a temperature sensor that detects the temperature at the entrance and exit of the high-temperature heat pump, and a temperature sensor that detects the temperature at the entrance and exit of the low-temperature heat pump. A heat pump water heater characterized by comprising a detector, a display mechanism equipped with an alarm device based on the above-mentioned temperature signals and a failure diagnosis mechanism stored in an internal memory, and a failure diagnosis device that notifies abnormalities through a printing mechanism. 2 If the temperatures of the temperature detectors at the entrance and exit of the high-temperature side heat pump both become higher than the predetermined set temperatures A and B, the three-way electric valve that controls the inlet temperature of the high-temperature side heat pump will fail and the hot water storage tank will be bypassed. 2. The heat pump water heater according to claim 1, further comprising a failure diagnosis device having a failure diagnosis mechanism having a function of determining that hot water no longer flows through the short-circuited pipe.