KR200361542Y1 - Equipment of Error Checking and Correcting for Heat and Flow Meter - Google Patents

Abstract

The present invention relates to a device for diagnosing a failure of a heat / flowmeter installed in a multi-unit house, and an apparatus for diagnosing a failure of a heat / flowmeter on the spot where a heat / flowmeter is installed. To this end, the present invention provides a low temperature water supply for supplying a low temperature water of a predetermined temperature to the heat and flow meter at a predetermined flow rate, and a low temperature detection for providing a fault diagnosis calculator that measures the low temperature water temperature and generates a heat and flow meter failure alarm. However, a high temperature constant temperature bath storing high temperature water used as a reference temperature of calorie calculation, a high temperature sensing stage for measuring the temperature of the high temperature water in the high temperature constant temperature water bath and providing the fault diagnosis calculator, and the temperature of the measured low temperature water. Receives / computes the temperature of the hot water and the flow rate of the cold water, compares it with the heating calorie and heating flow rate measured by the heat and flow meter, and when there is a predetermined difference, the fault diagnosis that generates a failure alarm of the heat and flow meter; A calibration operator is provided.

Description

Equipment of Error Checking and Correcting for Heat and Flow Meter}

The present invention relates to a device for diagnosing a failure of a heat / flowmeter installed in a multi-unit house, and an apparatus for diagnosing a failure of a heat / flowmeter on the spot where a heat / flowmeter is installed.

According to the Ministry of Commerce, Industry and Energy (Guide to installation and installation of heating meter for central intensive heating unit), it is necessary to install heating meter or heating hot water meter in one apartment complex. Main heating meters should be installed for each building so that the total calories used for each building can be measured. That is, according to the Ministry of Commerce, Industry and Energy, the multi-unit house of the central heating and district heating supply system must selectively install a heat and flow meter such as a heating meter and a heating hot water meter for each household.

Therefore, the above-mentioned heat and flow meter can be installed in each household of the apartment house which performs central heating and individual heating to impose a reasonable heating cost according to the amount of heat used, so that the user can manage the heating and save energy. .

1 is a diagram showing a general installation example of a heating meter in the heat flow meter.

A heating meter is a device that measures the amount of heat received or given by a heat medium, which is generally liquid, as it passes through a heat exchange circuit. ) Detects and converts it into calories.

To this end, the heating meter is a flow rate unit 102 for measuring the passage volume of the feed water, temperature detectors 104, 106 (supply side temperature reduction unit, return side temperature reduction unit) for measuring the temperature difference between the supply side piping water and the return side piping water of the flow rate, flow rate The calculating part 100 which calculates a heat amount according to the measurement amount of a part and a temperature detection part is provided.

The amount of heat and the detected flow rate measured by the calculator 100 are transmitted to the recorder 108 for display. Accordingly, the recorder 108 receives predetermined data from the calculation unit 100 and displays the integrated calorific value, integrated flow rate, instantaneous calorific value, instantaneous flow rate, supply temperature, return temperature, temperature difference, operation time, and the like.

By the way, the heating meter has the advantage of measuring the amount of heat used and the amount of heat supplied and returned and the amount of heat used for heating, while the installation cost is expensive, maintenance costs due to replacement of consumables and frequent failures There is this.

In particular, the heating meter installed on the site frequently causes breakdowns in the calculation unit, the flow part, and the temperature detection part of the heating meter due to defects in construction and water pollution of the heating circulating water. It was inconvenient to separate the heating meter and send it to the manufacturing company for a malfunction. In addition, due to the opacity of the A / S due to the small size of the manufacturer of the heating meter, there was a difficulty in diagnosing the failure of the heating meter in time and economically.

On the other hand, in case of distributing household heating costs by measuring the amount of heating water passed for a certain time in a certain heating zone, such as another heat and flow meter, a hot water meter, it is easy to determine whether the hot water meter measuring the amount of heating water is broken. I could not.

The present invention proposed to solve the above problems, by the flow of low-temperature water for the diagnosis of the failure of the heat flow meter, such as heating meter and hot water meter to determine whether the measured heat value and flow rate abnormality, It aims to be able to diagnose the malfunction of the heat / flow meter on the spot. In addition, by presenting a variety of ways to flow low-temperature water to the heat flowmeter, it aims to facilitate the diagnosis of the heat flowmeter.

1 is a state diagram illustrating an installation example of a heat flow meter.

2 is a state diagram illustrating a state of diagnosing a failure of a heat / flow meter using a circulation pump.

3 is a state diagram showing a state of diagnosing a failure of a heat / flow meter by gravity drop.

4 is a state diagram showing a state of diagnosing a failure of a heat flowmeter using a piston pusher.

* Description of the symbols for the main parts of the drawings *

210: trouble diagnosis calculator 212: low temperature water flow meter

220: high temperature constant temperature water tank 222: high temperature detection stage

224: supply side temperature sensing unit 230: low temperature constant temperature water tank

232: low temperature detection stage 236: circulation pump

In order to achieve the above object, the present invention provides a low temperature water supply for flowing a low temperature water of a predetermined temperature to a heat and flow meter, and a failure diagnosis calculator for measuring a low temperature water temperature and generating a heat and flow meter failure alarm. A low temperature detection stage, a high temperature constant temperature tank storing high temperature water used as a reference temperature for calorie calculation, a high temperature detection stage for measuring the temperature of the high temperature water in the high temperature constant temperature water tank and providing the temperature to the fault diagnosis calculator, and the measured low temperature. Receives / computes the temperature of the water, the temperature of the hot water, and the flow rate of the cold water, compares it with the heating calorie and heating flow rate measured by the heat and flow meter, and generates a heat and flow meter failure alarm when there is a predetermined difference. A diagnostic operator is provided.

Therefore, the present invention calculates the difference between the calorific value and the flow rate with the hot water in the high temperature constant temperature tank by flowing the low temperature water of a constant flow rate through the heat / flow meter to determine whether the components of the heat / flow meter are broken.

On the other hand, a low temperature water supply for flowing low temperature water to the flow meter may be presented a variety of devices, in this detailed description of the low temperature water supply embodiment, a device for providing low temperature water using a circulation pump and the circulation pipe (Fig. 2), an apparatus for naturally providing low temperature water using gravity drop (FIG. 3) and an apparatus for providing low temperature water using a compressor such as a piston pusher (FIG. 4) will be described.

Therefore, it will be apparent to those skilled in the art that the low temperature water supplier can be easily implemented in various ways in addition to the above embodiments.

Hereinafter, with reference to the drawings the most preferred embodiment of the present invention will be described in detail.

2 is a state diagram illustrating a state of diagnosing a failure of a heat / flowmeter after providing low temperature water to the heat / flowmeter using a circulation pump as an embodiment of the present invention.

As described above, the thermo-flow meter diagnostic apparatus 200 for diagnosing the failure of the thermo-flow meter has a low temperature water supply unit 240, 230, 212, 236, a low temperature sensing unit 232, a high temperature constant temperature water tank 220, and a high temperature sensing unit ( 222, a failure diagnosis calculator 210.

However, in order to provide the low-temperature water to the heat / flow meter using a circulation pump, the low-temperature water supply device includes a heat / flowmeter heating pipe located at the heat / flowmeter supply line three-way valve 262 and the return line three-way valve 264. A low temperature constant temperature water tank (230) installed in the form of a closed loop to allow the low temperature water to flow, and a low temperature constant temperature water tank (230) installed in the middle of the circulation pipe to contain the low temperature water to provide the low temperature water to the heat / flow meter (230). And a low temperature water flow meter 212 for measuring the flow rate of the circulated low temperature water and providing the measured low temperature water flow rate value to the fault diagnosis calculator, the circulation pipe 240 and the heat flow meter heating pipe 260. It includes a circulation pump 236 for circulating the cold water in the low temperature constant temperature water tank 230.

Hereinafter, each said functional part is explained in full detail.

The circulation pipe 240 should be installed in the form of a closed loop at the front and rear ends of the heat and flow meter 254. For this purpose, two installation examples are presented.

The first method is to separate the heating pipes of the supply line three-way valve 262 and the return line three-way valve 264 of the heat and flow meter, and place them in the middle. The part where the circulation pipe is installed is the supply line three-way valve ( It may be a hot water valve stage 263 which is one end of the side 262, and a drain valve stage 265 of the return line three-way valve 264 side.

As another installation example of the circulation pipe 240, instead of the hot water valve stage 263, which is one end of the three-way valve 262, the strainer 272 (Strainer, filter) installed in front of the flow section 254. Connect the circulation pipe 240, and separate the return line three-way valve 264 instead of the drain valve stage 265 on the return line three-way valve 264, and instead install a 90 ° elbow to connect to the circulation pipe .

Hereinafter, the installation example of the circulation pipe 240 is described as being connected to the supply line three-way valve 262 and the return line three-way valve 264, but instead of the three-way valves 262 and 264, the strainer 272 and the 90 ° elbow are circulated. It will be obvious that the same description will be made even if the piping is connected.

On the other hand, by providing the circulation pipe 240 as described above, the circulation pipe 240 is positioned between the supply line three-way valve 262 and the return line three-way valve 264 of the heat flow meter in a closed loop form, By controlling the three-way valve (262, 264) installed on both sides of the flow meter to allow the low temperature water in the low temperature constant temperature water tank 230 to circulate between the heat and flow meter heating pipe 260 and the circulation pipe 240, it is possible to diagnose the failure of the heat and flow meter. It is.

The low temperature water circulation in the circulation pipe 240 is achieved by closing the ball valves 270 and 271 installed at the front end of the supply line three-way valve 262 and the rear end of the return line three-way valve 264. Therefore, the ball valves 270 and 271 are closed before the circulation pipe is installed, thereby preventing the heating water from flowing into the heat / flowmeter heating pipe 260.

The circulation pump 236 performs a function of circulating the low temperature water in the low temperature constant temperature water tank 230 at a constant flow rate between the heat / flow meter heating pipe 260 and the circulation pipe 240.

The low temperature constant temperature water tank 230 is a constant temperature water tank that maintains a constant temperature of the low temperature water circulating between the heat and flowmeter heating pipe and the circulation pipe, and is heated to a constant temperature through the heating device 234 to maintain the constant temperature. Or using shisu.

The high temperature constant temperature water tank 220 is a constant temperature water tank having high temperature water, and the temperature sensing unit 224 of the heat / flow meter and the high temperature sensing end 222 of the failure diagnosis apparatus adjust the temperature of the high temperature water in the high temperature constant temperature water tank 220. It detects and provides the temperature value of hot water to the calculating part 252 and the failure diagnosis calculator 210 of a heat | fever meter.

The low temperature water flow meter 212 measures the flow rate of the low temperature water circulated between the heat and flow meter heating pipe 260 and the circulation pipe 240 to provide it to the failure diagnosis calculator 210.

The low temperature detecting unit 232 detects the low temperature water temperature in the low temperature constant temperature water tank 230 and provides the failure diagnosis calculator 210, and the high temperature detection end 222 detects the high temperature water temperature in the high temperature constant temperature water tank 220. Performs a function provided to the failure diagnosis calculator (210).

The failure diagnosis calculator 210 is a computer processing apparatus including a CPU capable of performing a predetermined operation, a memory for storing predetermined data, and a display window for displaying a predetermined screen. It is a concept that encompasses personal computers.

The failure diagnosis calculator 210 detects the flow rate of the low temperature water from the low temperature water flow meter 212 (hereinafter referred to as a low temperature water flow rate), the low temperature temperature detection end temperature from the low temperature detection end 232, and the high temperature detection temperature from the high temperature detection end 222. However, the temperature is received and stored in a predetermined database. In addition, the calorific difference between the low temperature water of the low temperature constant temperature water tank 230 and the high temperature water temperature constant temperature tank 220 using the respective temperatures provided from the low temperature detection unit 232 and the high temperature detection unit 222 of the failure diagnosis apparatus. (Hereinafter referred to as trouble diagnosis calorie difference).

In addition, the failure diagnosis calculator 210 has a flow rate from the heat / flow meter calculation unit 252 to the return side temperature reduction unit 258 temperature, the supply side temperature reduction unit 224 temperature, and the heat / flow meter (hereinafter, referred to as a heat / flow meter flow rate). The heat difference between the low temperature water of the return side temperature sensing unit 258 and the high temperature water of the supply side temperature sensing unit 224 is received from the heat / flow meter through the temperature / flow rate / calorie signal line 214 and stored in a predetermined database. At this time, the temperature measured by the supply-side temperature reducing unit 224 is not the temperature of the supply-side piping water at normal, but the temperature of the high-temperature water of the high temperature constant temperature water tank 220.

The failure diagnosis calculator 210 includes the diagnostic information (failure difference calorific value, low temperature water flow rate, low temperature detection end temperature, high temperature detection end temperature) of the failure diagnosis apparatus 200 provided in the above manner, and heat and flow rate of the flow meter. Compare and compare flowmeter information (heat / flowmeter calorie difference, heat / flowmeter flow rate, return-side thermostat section temperature, supply-side thermostat section temperature).

Hereinafter, a description will be given of the operation of the heat flow meter failure diagnosis apparatus 200 using the circulation pump described in FIG.

First, the ball valves 270 and 271 are closed and the supply line three-way valve 262 and the return line three-way valve 264 located on both sides of the heat and flow meters installed in the field are separated, thereby closing the ends of the heat and flow meter heating pipes 262 and 264. Connect the loop-shaped circulation pipe 240. Accordingly, the portion where the circulation pipe 240 is installed may be the hot water valve stage 263 of the supply line three-way valve 262 and the drain valve stage 265 installed at the return line three-way valve 264.

As another installation example of the circulation pipe, instead of the hot water valve end 263 on one side of the three-way valve 262 side, the circulation pipe 240 is connected to a strainer 272 provided in front of the flow rate part 254. ), And instead of the drain valve stage 265 on the return line three-way valve 264, the return line three-way valve 264 can be removed and a 90 ° elbow can be installed instead to connect to the circulation pipe.

In addition to the circulating piping connection, the heat / flow meter diagnostic apparatus 200 is configured to receive heat / flowmeter information (heat / flowmeter calorie difference, heat / flowmeter flow rate, return-side temperature sensing unit temperature, supply side temperature sensing unit temperature) from the heat / flowmeter. The flow rate / calorie signal line 214 is connected to the operation unit 252 and the failure diagnosis calculator 210 of the heat / flow meter.

After the circulation pipe 240 and the temperature / flow / heat signal line 214 is installed as described above to maintain the temperature of the low temperature constant temperature water tank 230 and the high temperature constant temperature water tank 220 at a constant temperature, the supply side of the heat flow meter The hot portion 224 is separated from the supply pipe water (Fig. 1, reference numeral 118) and inserted into the high temperature constant temperature water tank 220.

That is, the normal installation of the heat flow meter is shown in Figure 1, the supply side temperature sensing portion is provided in the supply side pipe water 118, the return side temperature sensing portion is installed in the return side piping water, according to the present invention In installing a diagnostic apparatus, as shown in FIG. 2, the supply side temperature-sensitive part 224 of a heat-flow meter is inserted in the high temperature constant temperature water tank 220 instead of the supply side piping water 118. As shown in FIG.

By regulating the supply line three-way valve 262 and the return line three-way valve 264 installed on both sides of the heat / flow meter, the low temperature water of the low temperature constant temperature water tank 230 circulates the heat / flow meter heating pipe 260 and the circulation pipe 240. do. The cold water circulated to maintain a constant flow in the pipe by the operation of the circulation pump 236.

After the temperature and flow rate of the low temperature water are maintained in the normal state, the failure diagnosis calculator 210 measures and calculates the diagnosis information of the failure diagnosis device such as the difference in the amount of failure diagnosis, the low temperature water flow rate, the low temperature detection end temperature, and the high temperature detection end temperature. do.

In addition, the heat / flow meter measures / calculates the heat / flowmeter information such as heat / flowmeter calorie difference, heat / flowmeter flow rate, return-side thermostat temperature, supply-side thermostat temperature, and the like by using the fault diagnosis calculator 210 for temperature / flow rate / calorie. Transmit via signal line 214.

The failure diagnosis calculator 210 compares and compares the above-mentioned diagnosis device diagnosis information and heat and flowmeter information to generate a failure alarm of a corresponding component when there is a difference over a predetermined reference value.

In other words, when there is a difference between the calorific value difference and the heat / flow meter calorie difference by more than a certain reference value, a failure alarm indicating that the calculation unit of the heat / flow meter is out of order, and when there is a difference between the low temperature water flow rate and the heat / flow meter flow rate, When there is a difference between the low temperature detection stage temperature / high temperature detection stage temperature and the return side temperature sensing unit temperature / supply side temperature sensing unit temperature, the error alarm of the return side temperature sensing unit / supply side temperature sensing unit of the heat / flow meter is displayed on the fault diagnosis calculator display window. Easy to know the fault part of the flowmeter.

On the other hand, the failure diagnosis calculator 210 calculates the difference in calories between the two temperatures measured at the high temperature detection stage 222 and the low temperature detection stage 232, using a calorimetric calculation method known to the general public used in the conventional heat flow meter In this detailed description, only the basic expression thereof is described, and detailed description thereof is omitted.

The formula for calculating calories using mass is as follows.

[Equation 1]

Q = calories

= Mass flow rate of the thermal fluid through the calorimeter

= Difference between the specific enthalpy of the thermal fluid in the flow and the circulation temperature of the heat exchange circuit

t = time

If the calories are calculated by volume instead of mass, the following [Equation 2].

[Equation 2]

Q = calories

k = calorie conversion factor which is the state function of the heat medium liquid at the relevant temperature and pressure

= Temperature difference between cycles of the heat exchanger circuit

V = volume of liquid passed through

Therefore, the failure diagnosis calculator 210 measures the low temperature water flow rate measured by the low temperature water flow meter 212 using the above [Equation 1] or [Equation 2], the low temperature detection end temperature and the high temperature measured by the low temperature detection unit 232. The calorific difference between the low temperature water in the low temperature constant temperature water tank 230 and the high temperature water in the high temperature constant temperature water tank 220 may be calculated using the high temperature detection end temperature measured by the detection stage 222.

Therefore, when there is a difference between the calories difference between the two constant temperature baths calculated as described above with the calories difference calculated by the calculation unit 252 of the heat / flow meter, the failure diagnosis calculator 210 determines the heat / flow meter calculation unit 252. ) Can cause a failure alarm.

3 is a state diagram illustrating an apparatus for diagnosing a failure of a heat / flow meter using gravity drop as another embodiment of the present invention.

The heat and flow meter failure diagnosis and correction apparatus 300 using gravity drop is a constant low temperature water by gravity drop in the low temperature constant temperature water tank 330 instead of the circulation pipe 240 and the circulation pump 236 shown in FIG. It flows to the heat and flow meter heating pipe 260 to take a method of measuring the failure diagnosis.

Since the flow rate of the low temperature water flowing through the heat / flow meter heating pipe 260 can be measured through the flow rate meter of the low temperature constant temperature water tank 330, the low temperature water flow meter 212 shown in FIG. 2 is not required.

It describes the installation and operation method of the thermal flowmeter failure diagnosis and correction device 300 using the gravity drop shown in FIG.

In order to install the thermal flowmeter fault diagnosis and correction device using gravity drop, the low temperature constant temperature water tank 210 is connected to the hot water valve stage 263 or strainer 272 of the supply line three-way valve 262 installed in the field. The low temperature water in the low temperature constant temperature water tank 210 is allowed to flow into the heat / flow meter heating piping 260. Also, the supply side temperature-sensitive portion 224 of the heat / flow rate meter is separated from the supply side piping water to the high temperature constant temperature water tank 220. Insert it.

The low temperature water in the low temperature constant temperature water tank 330 flowing into the heat / flow meter heating pipe 260 flows by free fall due to gravity, and the low temperature water in the low temperature constant temperature water tank 330 is fixed through the heating device 234. It may be heated to temperature or may use time water.

As described above, when the thermal flowmeter failure diagnosis and correction apparatus are installed using the gravity drop, the hot water valve stage 263 or the strainer 272 installed on the supply line three-way valve 262 side from the low temperature constant temperature water tank 330. The supply line three-way valve 262 and the return line three-way valve 264 to flow through the flow and flow portion 254 of the flow meter and exit to the drain valve stage 265 of the return line three-way valve 264 through the Adjust That is, by adjusting the supply line three-way valve 262 to flow the hot water of the low temperature constant temperature water tank to the flow rate section 254, the hot water passed through the heat flow meter flow section 254 by adjusting the return line three-way valve 264 To escape to the outside through the drain valve stage 265.

As described above, when the low temperature water in the low temperature constant temperature water tank 330 flows along the heating pipe 260 of the heat flow meter, the heat flow rate meter has a heat flow rate calorific difference, a heat flow rate flow rate, a return side temperature sensing part temperature, and a supply side temperature sensing part temperature. Measurement and computation of heat and flow meter information, such as the like, is transmitted to the failure diagnosis calculator 210 through the temperature / flow rate / calorie signal line 214.

On the other hand, the fault diagnosis calculator 210 measures and calculates fault diagnosis device diagnostic information such as a fault diagnosis calorific difference, a low temperature water flow rate, a low temperature detection end temperature, and a high temperature detection end temperature. The failure diagnosis calculator 210 compares and compares the above-mentioned diagnosis device diagnosis information and heat and flowmeter information to generate a failure alarm of a corresponding component when there is a difference over a predetermined reference value.

That is, a failure alarm indicating a failure of the calculation unit 252 of the heat / flow meter when the error diagnosis calorie difference and the heat / flow meter calorie difference differs by more than a predetermined reference value, and when there is a difference between the low temperature water flow rate and the heat / flow meter flow rate, When there is a difference between the low temperature sensing stage temperature / high temperature sensing stage temperature and the return side temperature sensing section temperature / supply side temperature sensing section temperature, a fault alarm of the return side temperature sensing section / supply side temperature sensing section 258,224 is generated. By displaying the fault diagnosis display on the calculator, it is easy to see the fault of the flowmeter.

On the other hand, in another embodiment similar to the thermo-flow meter failure diagnosis device using the gravity drop described in Figure 3, using a compressor such as a piston pusher instead of the low temperature constant temperature bath 330 of Figure 3 that can measure the flow rate Can perform flowmeter fault diagnosis.

That is, as shown in FIG. 4, the piston pusher 400 is connected to the hot water valve stage 263 or the strainer 272 instead of the low temperature constant temperature bath to flow hot water to the heat / flow meter heating pipe 260. This compares the flow rate values using the principle that the amount of water exiting from the piston pusher 400 and the amount of water passing through the heat / flow meter flow part 254 are the same, and the operation method is the same as that of FIGS. Omit.

On the other hand, as an embodiment of the present invention, in Fig. 2, 3, 4, the heat flow meter is shown and described as an example. However, this is a description of the diagnosis device for diagnosing the failure of the heating meter among the heat and flow meters.In the case of another heat and flow meter, the hot water meter also flows a certain amount of water to the circulation pipe and immediately determines whether there is a failure in measuring the flow rate of the hot water meter. It can be obvious. Therefore, it is obvious that the present invention is not limited to a heating meter and a hot water meter, but is applicable to both a heat and a flow meter including these.

Therefore, the technical idea of the present invention has been described in detail according to the preferred embodiment, but the above-described embodiment is for the purpose of description, and various embodiments within the scope of the technical idea of the present invention are those skilled in the art. You will understand that it is possible.

As described above, the present invention can diagnose the failure of the calculation unit, the flow unit, and the supply-side thermostat / return-side thermostat of the heat / flowmeter installed in the field on-site and replace the failure of the heat / flowmeter in a timely manner. Therefore, the effect of improving the reliability of the thermal flowmeter can be obtained.

Claims (8)

In the apparatus for diagnosing the failure of the heat flow meter provided with the supply side temperature sensing unit 224, the return side temperature sensing unit 258, the flow rate unit 254, the calculation unit 252 for measuring the heating calorie and heating flow rate, A low temperature water supply (230, 212, 240, 236; 3300; 400) for causing the low temperature water of a predetermined temperature to flow through the heat / flow meter; A low temperature detection stage 232 which measures the low temperature water temperature and provides the failure diagnosis calculator 210 to generate a heat / flow meter failure alarm; A high temperature constant temperature water tank 220 storing high temperature water used as a reference temperature of calorie calculation, A high temperature detection stage 222 for measuring the temperature of the high temperature water in the high temperature constant temperature water tank 220 and providing the temperature to the failure diagnosis calculator 210; Receive / calculate the measured temperature of the cold water, the temperature of the hot water, and the flow rate of the cold water, compare and compare it with the heating calorie and heating flow rate measured by the heat and flow meter, and when there is a predetermined difference, the heat and flow meter failure alarm Fault diagnosis calculator 210 for generating a Heat flow meter failure diagnosis and correction device provided with. According to claim 1, wherein the low temperature water supply, A circulation pipe 240 installed at the front end of the heat and flow meter and the rear end of the heat and flow meter so that the low temperature water is circulated in the closed loop; A low temperature constant temperature water tank 230 installed in the middle of the circulation pipe 240 and containing low temperature water to provide low temperature water to the heat / flow meter; A low temperature water flow meter 212 which measures the flow rate of the circulated low temperature water and provides the measured low temperature water flow value to the failure diagnosis calculator 210; Circulating pump 236 for circulating the cold water in the low temperature constant temperature water tank between the circulation pipe 240 and the heat flow meter heating pipe 260. Heat and flow meter failure diagnosis and correction device, characterized in that it comprises a. According to claim 2, wherein the circulation pipe 240 provided at the front end of the heat flow meter, Heat and flow meter failure diagnosis and correction device characterized in that it is connected to the strainer (272; strainer) that is a filtration filter on the supply line three-way valve (262) or the hot water valve end (263) of the supply line three-way valve (262). According to claim 2, The circulation pipe 240 is installed in the rear end of the heat flow meter, Heat / flow meter failure diagnosis characterized in that it is connected to the drain valve stage 265 on the return line three-way valve 264, or by removing the return line three-way valve 264 by inserting a 90 ° elbow pipe. And calibration device. The apparatus of claim 1, wherein the low temperature water supply unit comprises a low temperature constant temperature water tank (330) for flowing low temperature water to the heat / flow meter by gravity drop. The apparatus for diagnosing and correcting a heat and flow meter according to claim 1, wherein the low temperature water supply device flows the low temperature water through the heat and flow meter using a compressor 400 capable of measuring a flow rate such as a piston pusher. The apparatus of claim 2 or 5, wherein the low temperature constant temperature water tank (230; 330) maintains the constant temperature by heating the low temperature water at a predetermined cycle. The low-temperature water flowing through the heat / flowmeter is discharged to the outside through the drain valve stage 265 of the return line three-way valve 264 located at the rear end of the heat / flowmeter. Heat and flow meter failure diagnosis and correction device.