JPH024159A - Heat pump hot water feed device - Google Patents

Abstract

PURPOSE:To perform proper and rapid judgment of a trouble and abnormality of a device by a method wherein by means of detecting signals outputted from a temperature sensor mounted in a specified position and an integrating wattmeter situated on each heat pump, abnormality or normality is diagnosed based on the internal program of a trouble diagnosing part. CONSTITUTION:The temperatures of given parts and the powers of wattmeters 48 and 49 are detected by means of temperature sensors 34, 35, 36, 37a, 37b, 38a, and 38b, and by means of the detecting signal, the trouble of a device is monitored by a trouble diagnosing part 39. For example, when an integrating power amount of a heat pump on the high temperature side exceeds a given value and a hot water temperature is reduced to a value lower than a set value and other abnormality is not detected, based on a trouble diagnosing program stored in an internal memory 47 of the trouble diagnosing part 39, it is judged that the efficiency of a heat pump is reduced, a report to that effect to a supervisor is made by a display part 40 and a printing part 41.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heat pump water heater for supplying hot water to housing complexes, business hotels, etc., and particularly to a heat pump water heater equipped with a failure diagnosis device that detects system abnormalities at an early stage. Regarding equipment.

[Conventional technology]

BACKGROUND ART Conventionally, as a heat pump water heater used in this type of housing complex, business hotel, etc., a device configuration generally shown in an outline in FIG. 5 is known.

In the figure, 1 is an open hot water storage tank with a predetermined hot water storage capacity, 2 is a heat pump whose operation is controlled by an operation controller to be described later and maintains hot water at a predetermined temperature, and 3 is a hot water storage tank 1.
4 is a hot water return pipe from the bottom of the tank to the heat pump 2, 4 is a hot water return pipe from the heat pump 2 to the top of the hot water storage tank 1, and 5 is a hot water circulation pump installed in the hot water return pipe 3.

Further, 6 is a water supply pipe connected to the hot water return pipe 3 between the hot water storage tank 1 and the hot water circulation pump 5, and 7 and 8 are hot water supply pipes and hot water return pipes connected to the hot water storage tank 1.
, 8 are connected with a plurality of hot water supply faucets 9 as load sides, and 10 is a hot water circulation pump interposed in the hot water supply pipe T.

Furthermore, 11 is an operation controller for maintaining high temperature water, and a water level detector 12 that detects the hot water level in the hot water storage tank 1.
The operation of the heat pump 2 is controlled by the water level detection signal from the solenoid valves 13 installed in the water supply pipe 6 in sequence. Opening/closing control of the electric two-way valve 14 is performed.

In such a configuration, when hot water is supplied, the water level detector 12
In response to this signal, the electric two-way valve 14 is opened via the operation controller 11 to start water supply, and when water is supplied, the outlet temperature of the heat pump 2 is adjusted to be constant, and the water temperature in the hot water tank 1 is kept constant.

In addition, a hot water circulation pump 10 is connected to the piping 7 and 8 on the hot water supply load side.
The hot water is constantly circulating.

In a conventional device with such a simple configuration, 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 to be solved by the invention]

However, in recent years, multiple heat pumps.

As heat pump devices with complex configurations such as those having multiple hot water storage tanks have come to be used, devices that do not have a failure diagnosis mechanism as in the past may have problems with some of the configurations in the event of an abnormality or failure of the device. Even if an element were to fail, it was difficult to determine the failure due to the complex configuration, and as a result, administrators were slow to notice the abnormality, which could have serious consequences.

[Means to solve the problem]

The present invention includes a temperature sensor that detects the temperature of hot water supplied from a hot water storage tank on the high temperature side, a temperature sensor that detects the temperature of the hot water storage tank on the low temperature side, and a temperature sensor that detects the temperature of hot water in the hot water storage tank on the low temperature side. A temperature sensor that detects the temperature of the high-temperature heat pump, a temperature sensor that detects the outlet temperature and inlet temperature of the high-temperature heat pump, a temperature sensor that detects the outlet temperature and inlet temperature of the low-temperature heat pump, and a temperature sensor that detects the integrated electric energy of the high-temperature heat pump. The integrated wattmeter detects the integrated power amount of the low-temperature side heat pump, the integrated wattmeter detects the integrated power amount of the low-temperature side heat pump, and the detected values from all these temperature sensors and integrated wattmeters are input, and a fault diagnosis program stored in memory in advance is used to detect the failure. The system is equipped with a fault diagnosis section that performs diagnosis, and a display output section that displays the results of the fault diagnosis and issues a warning in the event of an abnormality.

[Effect]

The present invention inputs detection signals from a temperature sensor and an integrated wattmeter in a fault diagnosis section, judges the detection signals according to a fault diagnosis program stored in a memory in advance, and performs a fault diagnosis of a heat pump water heater. This is to provide a warning notification.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and in the figure, 21 is a high temperature side hot water storage tank for storing high temperature water for hot water supply;
22 is a heat pump on the high temperature side that circulates and heats high temperature water;
31.23b is an outgoing pipe and a return pipe that connect the lower and upper parts of the high temperature side hot water storage tank 21 to the heat pump 22;
25 is a three-way electric valve that connects the outgoing pipe 23 & and the return pipe 23b and bypasses the heat pump 22, 25 is a three-way electric valve that connects the outgoing pipe 23m and the short-circuit pipe 24, and controls the inlet temperature of the heat pump 220, and 26 is a three-way electric valve that controls the three-way electric valve 25. 27 is a hot water circulation pump for a high temperature system installed between the three-way electric valve 25 and the heat pump 22 in the middle of the outgoing pipe 23&, 28 is a low temperature side hot water storage tank for storing low temperature water, and 29 is a hot water circulation pump for storing low temperature water. Low-temperature heat pump with circulating heating, 3oa
, 30b is an outgoing pipe and return pipe that connects the lower part of the low temperature side hot water storage tank 28 to the low temperature side heat pump 29, 31 is a hot water circulation pump for the low temperature system installed in the middle of the outgoing pipe 30&, and 32 is a high temperature side hot water storage tank. A pipe connecting the lower part of 21 and the upper part of the low temperature side hot water storage tank 28, 33 a pipe for supplying high temperature water from the high temperature side hot water storage tank 21, 34 a temperature sensor for detecting the temperature of hot water supplied from the high temperature side hot water storage tank 21, 35 is a temperature sensor that detects the temperature in the low temperature side hot water storage tank 28; 36 is a temperature sensor that detects the temperature in the return pipe; 371;

37b is a temperature sensor that detects the inlet temperature and outlet temperature of the heat pump 220 on the high temperature side, 38a and 38b are temperature sensors that respectively detect the inlet temperature and the outlet temperature of the low temperature side heat pump 290, and 39 is all the temperature sensors and an electric power unit to be described later. Enter the detected value from the meter and make a note in advance.
This is a fault diagnosis section that diagnoses the failure of the device using a fault diagnosis program stored in the display section 4.
0 is displayed and printed on the printing section 41 to issue a warning in the event of an abnormality. Furthermore, 42 is the low temperature side hot water storage tank 2
A water supply pipe installed at the bottom of B, 43 is a faucet installed in the middle of the pipe 33, and 44 is a temperature detector 45e that detects when the temperature of hot water in the pipe 33 drops, and turns the high-temperature water in the high-temperature side hot water storage tank 21 on. This is a hot water circulation pump that circulates the water and sequentially fills the inside of the piping 33 with high temperature water.

Normally, the hot water circulation pump 44 has a timer function and is controlled by an internal control device (not shown) to stop operating after several minutes of operation.

45m is a temperature sensor installed at the bottom of the hot water storage tank 21 on the high temperature side and used to detect the temperature inside the tank and determine whether a certain amount of hot water at a certain temperature has been stored; 45b is the temperature sensor on the low temperature side hot water storage tank 2;
This is a temperature sensor installed inside the water tank 8 to detect the water temperature. Further, 48 is an integrated wattmeter that measures the integrated power of the high temperature side heat pump 22, and 49 is an integrated wattmeter that measures the integrated power of the low temperature side heat pump 29.

In such a configuration, the operation of the heat pump 29 is controlled on and off in response to a signal from the water temperature detector 45b in order to keep the water temperature constant in the hot water storage tank 28 on the low temperature side. On the other hand, in the high-temperature side hot water storage tank 21, the operation of the heat pump 22 is controlled on and off by a signal from the water temperature detector 45m in order to keep the amount of high-temperature water constant.

Furthermore, if the temperature of the hot water supplied from the heat pump 22 is maintained at a constant temperature of 60°C, for example, the opening degree of the three-way electric valve 25 is automatically controlled by the sensor 26, and the inlet temperature is adjusted to a temperature difference. This is done by keeping the temperature constant at 55°C.

Normally, the heat pump device operates as described above, but at the same time, the temperature sensors 34, 35, 36゜37m,
37b, 3sm, and 38b detect the temperature of each predetermined part, and also detect the electric power of the wattmeter 48, 49, and based on these detection signals, the failure diagnosis section 39 monitors the failure of the device. For example, if the integrated power consumption of the high-temperature side heat pump rises above the set value, the hot water temperature falls below the set value, and there are no other abnormalities, the fault diagnosis program stored in the internal memory 47 of the fault diagnosis unit 39 It is determined that "the efficiency of the heat pump is decreasing" and a notification is sent to the administrator via the display unit 40° and print unit 41. This notification means may be a warning by voice or the like.

Next, the failure diagnosis program in the failure diagnosis section 47 will be explained according to the flowcharts of FIGS. 2 and 3. FIG. 2 is a flowchart of a failure diagnosis program for the high-pressure side heat pump. First, the device is started by turning on the power (521), and detection signals from each temperature sensor and each wattmeter are input (822, 523). Next, it is determined whether the integrated electric energy of the high temperature side heat pump 22 is higher than the set value A (824), and if it is higher than the set value A,
Furthermore, it is determined whether the hot water temperature is lower than the set value B (
825). Here, if it is lower than the set value B, it is determined whether there is any abnormality in other data (826), and if there is no abnormality, it is determined that "the efficiency of the heat pump is decreasing" and a warning is issued, for example, by voice, etc. Display section 40. Printing section 41
(827.828). In addition, 824
And No with N01825.

If there is an abnormality in S26, the process returns to 822 and continues temperature detection and integrated power detection. Moreover, FIG. 3 is a flowchart of the failure diagnosis program for the low-pressure side heat pump. As in FIG. 2, the device is started by turning on the power (531), and detection signals from each temperature sensor are input (833).

Next, it is determined whether the temperature inside the low temperature side heat pump is lower than the set value C (S33). Here, if it is lower than the set value C, check whether there is any abnormality in other data.83
4) If there is no abnormality, it will be determined that "the efficiency of the heat pump has decreased" and a warning will be issued by voice etc., and the display unit 40 will be displayed.
．． A message to that effect is output to the printing unit 41 (835, 836).

In addition, if there is an abnormality in N01834 in 833, 3
32 and continue temperature detection.

Figure 3 shows predicted measurement data based on a temperature simulation when the heat pump fails and efficiency decreases.

In the figure, Ta is the hot water output characteristic under normal conditions, Tb is the hot water output characteristic when the high temperature side heat pump fails and efficiency decreases,
TC is the characteristic in the low-temperature side hot water storage tank under normal conditions, and Td is the characteristic in the low-temperature side hot water storage tank when the low-temperature side heat pump fails and the efficiency decreases. As described above, by performing a simulation on the hot water supply load, it can be seen that when the heat pump fails, the temperature characteristics tend to be lower than when it is in normal operation.

As described above, in this embodiment, the detection signals from each temperature sensor and each integrated wattmeter are inputted to the fault diagnosis section 39, and
Since a failure diagnosis of the heat pump device is performed using a failure diagnosis program stored in advance in the memo+747, an alarm can be notified in the event of an abnormality.

〔Effect of the invention〕

The present invention is configured to diagnose whether or not there is an abnormality using the internal program of the failure diagnosis section based on the detection signal from the temperature sensor installed at a predetermined location of the device and the integrated wattmeter placed in each heat pump. It is possible to accurately and immediately determine failures and abnormalities in equipment, quickly report abnormalities to the administrator, and repair the equipment.

Repairs can be made immediately.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a heat pump water heater according to the present invention, FIG. 2 is a flowchart of a failure diagnosis program for a high temperature side heat pump, and FIG. 3 is a 70-chart of a failure diagnosis program for a low temperature side heat pump. FIG. 4 is a diagram showing predictions of temperature changes by simulation during normal operation and abnormal operation, and FIG. 5 is a conventional configuration diagram. 21.28@...Hot water tank, 22.29...Heat pump, 27,31.44...Hot water circulation pump, 3
4, 35, 36, 378, 37b, 3em. 38b...temperature sensor, 39-...failure diagnosis section,
40...display section, 41...printing section, 4T...dispute/memo IJ, 48.49...integrated wattmeter.

Claims (1)

[Scope of Claims] A high-temperature side hot water storage tank that stores high-temperature water for hot water supply, a high-temperature side heat pump that circulates and heats the high-temperature water, and a system that connects the lower and upper parts of the high-temperature side hot water storage tank to the high-temperature side heat pump, respectively. piping and return piping; short-circuit piping that connects to the outgoing piping and return piping and bypasses the heat pump on the high temperature side; and a three-way electric valve that connects the outgoing piping and the short-circuit piping to control the inlet temperature of the heat pump on the high temperature side; A sensor that controls the three-way electric valve, a high-temperature hot water circulation pump installed between the three-way electric valve and the high-temperature side heat pump in the middle of the outgoing pipe, and a low-temperature side hot water storage tank that stores low-temperature water. The low-temperature side heat pump that heats the water, the outgoing and return piping that connects the lower part of the low-temperature side hot water storage tank to the low-temperature side heat pump, the low-temperature system hot water circulation pump installed in the middle of the outgoing piping, and the lower part of the high-temperature side hot water storage tank. A pipe that connects the upper part of the hot water storage tank on the low temperature side, a hot water pipe that supplies hot water from the hot water storage tank on the high temperature side, and a pipe that is installed in the middle of the hot water piping to detect the temperature inside the hot water pipe, and if the temperature is lower than the set temperature, the high temperature side In a heat pump water heater equipped with a hot water circulation pump that has a control device that circulates high-temperature water in a hot water storage tank and controls the temperature inside the hot water piping to maintain it above a certain level, the temperature of hot water supplied from the hot water storage tank is controlled. A temperature sensor that detects the temperature inside the hot water storage tank on the low temperature side, A temperature sensor that detects the temperature inside the piping just before entering the hot water storage tank on the high temperature side to the hot water storage tank on the low temperature side, and A temperature sensor that detects the temperature in the piping just before entering the hot water storage tank on the high temperature side and the inlet temperature of the high temperature side heat pump. a temperature sensor that detects the inlet temperature and outlet temperature of the low-temperature side heat pump, a temperature sensor that detects the inlet temperature and outlet temperature of the low-temperature side heat pump, an integrated wattmeter that detects the integrated electric energy of the high-temperature side heat pump, and an integrated electric energy of the low-temperature side heat pump. a fault diagnosis unit that inputs detected values from the temperature sensor and the integrated power meter and performs a fault diagnosis using a fault diagnosis program stored in a memory in advance; and a fault diagnosis unit that displays the results of the fault diagnosis. 1. A heat pump water heater characterized by comprising a display output section that issues an alarm in the event of an abnormality.