KR20170026686A - How to avoid overheating of the hot water boiler - Google Patents

How to avoid overheating of the hot water boiler Download PDF

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Publication number
KR20170026686A
KR20170026686A KR1020150120192A KR20150120192A KR20170026686A KR 20170026686 A KR20170026686 A KR 20170026686A KR 1020150120192 A KR1020150120192 A KR 1020150120192A KR 20150120192 A KR20150120192 A KR 20150120192A KR 20170026686 A KR20170026686 A KR 20170026686A
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South Korea
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temperature
hot water
boiler
heat exchanger
user
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KR1020150120192A
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Korean (ko)
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KR101731533B1 (en
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주기동
김수영
이근용
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린나이코리아 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters

Abstract

The present invention relates to a method to prevent hot water from being overheated in a boiler, and specifically, to a method to prevent hot water from being overheated in a boiler, comprising: a step in which, when power is supplied to the boiler, a water flow detector unit in a control unit determines if a user is using hot water; a step of, when it is determined a user is using hot water, successively determining if the hot water temperature (Tw) detected by a hot water temperature detector unit is lower than the hot water set temperature of the user + X, if the tapping temperature (Tout) of a heat exchanger detected by a tapping temperature detector unit is lower than the hot water set temperature of the user + X, if the water return temperature (Tin) of a heat exchanger detected by a water return temperature detector unit is lower than a second overheating prevention temperature - Y, and if the tapping temperature (Tout) of the heat exchanger detected by the tapping temperature detector unit is lower than a first overheating prevention temperature - Y; and a step of, when it is determined all conditions are satisfied, operating the boiler in a hot water combustion mode. Therefore, the present invention can prevent user inconvenience by malfunction of detection of overheating of hot water in a normal status, prevent a consumer from getting burns by preventing overheating of hot water due to a disorder of a water flow detector unit such as a water flow switch or a water volume sensor, and greatly improve reliability and marketability of the product in accordance with control of the hot water temperature.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water boiler,

The present invention relates to a method of preventing hot water overheating of a boiler, and more particularly, to a method and apparatus for preventing overheating of a boiler during hot water combustion, When the temperature exceeding the overheat prevention temperature is detected, the method of performing the combustion only when all the standard overheat prevention temperature is not exceeded in the hot water temperature detection device, the heat exchanger return temperature detection device and the hot water temperature detection device before the hot water combustion It is possible to prevent the inconvenience of the consumer due to malfunction of the hot water overheating detection in the normal state and to prevent the hot water overheating due to the failure of the water flow detecting device such as the water flow switch or the water quantity sensor, To prevent hot water overheating of boiler One will.

Generally, a boiler is used to heat water by using combustion heat and heat generated by burning it using fuel, coal or gas as fuel, or supplying electricity to a heater, and supplying hot water to various heating facilities In the case of a domestic boiler, hot water is supplied to the piping installed on the floor of the room or the like, and is used for supplying hot water through a water pipe or the like.

When the heating mode is operated in the normal heating / hot water boiler, the circulation pump is operated to transfer the heating water, and the heating water is heated by the main heat exchanger and transferred to the heating load (i.e., heating pipe) Heating is done.

In addition, the supply of the hot water blocks the path from the three sides to the heating load side and opens the path to the hot water (hot water) heat exchanger so that the hot water heated in the main heat exchanger is transferred to the hot water (Hot water) heat exchanger, heat can be exchanged between the direct water and the heating water, and hot water can be supplied to the user.

The boiler having such a construction is installed with the capacity of the boiler being determined according to the appropriate level of the place where the heating is required. That is, if there are several rooms requiring heating, the capacity of the boiler is determined so that the heating can be supplied based on the entire room.

On the other hand, in a conventional boiler, a hot water temperature is detected by using a hot water temperature detecting device and a hot water temperature detecting device, and when the temperature of the hot water is judged to be equal to or higher than the reference overheating preventing temperature, hot water is prevented from being overheated have.

However, when the water detecting device such as the water flow switch or the water quantity sensor fails in the boiler in which the hot water overheating prevention function as described above is performed, the hot water burning may be performed without actually using the hot water. If the user uses hot water, the hot water may overheat and cause burns.

That is, when the water flow detecting device such as the water flow switch or the water quantity sensor of the boiler is broken, the hot water does not flow to the hot water side of the boiler and the hot water temperature detecting device can not detect the hot water temperature overheating. When the combustion and the extinguishing are repeated in the burner corresponding to the temperature change of the hot water of the heat exchanger detected by the temperature detecting device, the temperature inside the hot water heat exchanger becomes parallel to the temperature of the hot water of the heat exchanger.

In this state, if the user uses hot water, he can get burned.

Therefore, in order to prevent overheating of the hot water temperature by the tap water temperature detecting device of the heat exchanger, the overheat detecting temperature must be set to a low value. When the reference overheat detecting temperature is set low, there is a problem that digestion frequently occurs under normal hot water use conditions .

Korean Patent Publication No. 10-0245420 (November 29, 1999) Korean Registered Patent No. 10-0422856 (Mar. 02, 2004) Korean Registered Patent No. 10-0283257 (December 06, 2000)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a temperature detection apparatus and a method of detecting a temperature of a hot water from a heat exchanger when the burner of a boiler is burning hot water, The burner is automatically extinguished if the temperature above the reference overheating prevention temperature is detected, but only when the temperature exceeds the reference overheat preventing temperature in the heat exchanger tap water temperature detection device, the heat exchanger water temperature detection device and the hot water temperature detection device, It is possible to prevent the inconvenience of the consumer due to the malfunction of the hot water overheat detection in the normal state by performing the combustion and to prevent the hot water overheat due to the failure of the water flow detecting device such as the water flow switch or the water quantity sensor, In addition, the hot water temperature For reliability and product can dramatically improve the commercial value of its own, such as service water preventing overheating of the boiler in accordance with the method it is an object.

According to an aspect of the present invention, there is provided a method of controlling a boiler, the method comprising: determining whether a user uses hot water through a water flow detection device in a control device when power is supplied to a boiler; When the user uses the hot water, whether the hot water temperature Tw detected through the hot water temperature detecting device is lower than the hot water set temperature + X of the user or the hot water temperature Tout of the heat exchanger detected through the hot water temperature detecting device (Tin) of the heat exchanger detected through the water-return temperature detecting device is lower than the second overheat preventing temperature (-Y), the temperature of the hot water of the heat exchanger detected by the hot water temperature detecting device Sequentially judging whether the temperature Tout is lower than the first overheat preventing temperature-Y; And operating the boiler in the hot water combustion mode if all the conditions are satisfied as a result of the above determination.

When the boiler is operating in the hot water combustion mode, the control device determines whether the user continuously uses hot water, whether the hot water temperature Tw is lower than the third overheat preventing temperature, and whether the heat exchange water temperature Tin of the heat exchanger is lower than the second Determining whether the temperature is lower than the overheat preventing temperature; If it is determined that the user has stopped using hot water or the hot water temperature Tw is higher than the third overheat preventing temperature or the return temperature Tin of the heat exchanger is higher than the second overheating preventing temperature, And returning to the step of determining whether the initial user uses hot water after entering the fire extinguishing mode.

If it is determined by the controller that the user continues to use the hot water and the hot water temperature Tw is lower than the third overheat preventing temperature and the return temperature Tin of the heat exchanger is lower than the second overheating preventing temperature Determining whether the hot water temperature Tout of the heat exchanger is lower than the first overheat preventing temperature; When the hot water temperature Tout of the heat exchanger is lower than the first overheat preventing temperature, the process returns to the step of determining whether the hot water temperature Tw is lower than the third overheating preventing temperature, and when the hot water temperature Tout of the heat exchanger is lower than the first overheating And if the temperature is higher than the preheating temperature, entering the extinguishing mode into the boiler operating in the hot water combustion mode.

In addition, the control device having the boiler operating in the fire extinguishing mode when the hot water temperature Tout of the heat exchanger is higher than the first overheat preventing temperature may cause the display unit to display an error indicating that the hot water is overheated. And stopping the operation of all the components of the boiler to stop the operation of the boiler.

At this time, "X" to be added to the user's hot water set temperature is set to any temperature in the range of 5 to 20 ° C., and "Y" to subtract from the first and second superheat preventing temperatures is set to any temperature within the range of 5 to 10 ° C. Is set.

The first superheat preventing temperature is set to 85 to 95 ° C, the second superheat preventing temperature is set to 55 to 75 ° C, and the third superheat preventing temperature is set to 70 to 80 ° C .

As described above, according to the boiler heat prevention method of the present invention, when the burner of the boiler is in hot water combustion, the temperature detection device of any one of the heat exchanger tap water temperature detection device, the heat exchanger return water temperature detection device and the hot water temperature detection device The burner is automatically extinguished if the temperature above the reference overheating prevention temperature is detected, but only when the temperature exceeds the reference overheat preventing temperature in the heat exchanger tap water temperature detection device, the heat exchanger water temperature detection device and the hot water temperature detection device, It is possible to prevent the inconvenience of the consumer due to the malfunction of the hot water overheat detection in the normal state by performing the combustion and to prevent the hot water overheat due to the failure of the water flow detecting device such as the water flow switch or the water quantity sensor, Not only can it be prevented in advance, but also the hot water temperature Very useful inventions such that the reliability of the control and the product itself, etc. can dramatically improve the marketability.

1 is a schematic block diagram of a boiler to which the method of the present invention is applied;
2 is a flow chart for explaining the method of the present invention.

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

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Fig. 1 shows a schematic block diagram of a boiler to which the method of the present invention is applied, and Fig. 2 shows a flowchart for explaining the method of the present invention.

According to the present invention,

(S2) of judging whether the user uses hot water through the water flow detection device (5) in the control device (1) provided with the calculation device (1a) when power supply transfer is supplied to the boiler (S1);

If the user uses hot water, the hot water temperature Tw detected through the hot water temperature detecting device 4 is lower than the hot water set temperature + X of the user (S3), and the heat exchange detected by the hot water temperature detecting device 2 (Tin) of the heat exchanger detected through the water-return temperature detecting device 3 is lower than the second overheat preventing temperature-Y (S4) when the hot water temperature Tout of the heat exchanger is lower than the user's hot water set temperature + (S5) a step of sequentially determining whether the hot water temperature (Tout) of the heat exchanger detected through the hot water temperature detection device (2) is lower than the first overheat preventing temperature (Y) (S6);

If all the conditions are satisfied (Yes in all of S2 to S6), the igniter 11a provided in the burner is driven through the igniter driver 11 so as to cool the boiler to the hot water (S7) of operating in a combustion mode.

When the boiler is operating in the hot water combustion mode as described above, the control device 1 determines whether the user continuously uses hot water (S8) or whether the hot water temperature Tw is lower than the third overheat preventing temperature S9) and determining whether the return temperature Tin of the heat exchanger is lower than the second overheat preventing temperature (S10);

If it is determined in step S8 to S10 that the user has stopped using the hot water (No in step S8), or if the hot water temperature Tw is higher than the third overheat preventing temperature (No in step S9) If the temperature Tin is higher than the second overheat preventing temperature (No in S10), the boiler which was operating in the hot water burning mode enters the fire extinguishing mode (S11), and then returns to the step S2 of determining whether the initial user uses hot water Further comprising the steps of:

If the user continues to use the hot water (Yes in S8) and the hot water temperature Tw is lower than the third overheat preventing temperature (Yes in S9) (S12) of determining whether the hot water temperature Tout of the heat exchanger is lower than the first overheat preventing temperature if the water return temperature Tin of the heat exchanger is lower than the second overheating preventing temperature (Yes in S10);

If the hot water temperature Tout of the heat exchanger is lower than the first overheat preventing temperature, the process returns to step S8 where it is determined whether the hot water temperature Tw is lower than the third overheat preventing temperature, and the hot water temperature Tout of the heat exchanger And a step (S13) of entering a boiler operating in a hot water combustion mode into the extinguishing mode if the temperature is higher than the first overheating prevention temperature.

In addition, the control device 1 that has entered the extinguishing mode of the boiler (S13) because the hot water temperature Tout of the heat exchanger is higher than the first superheat preventing temperature causes an error indicating that the hot water is overheated on the display unit 6 (S14);

(S15) of stopping the operation of all the components of the boiler to stop the operation of the boiler safely.

At this time, "X" to be added to the user's hot water set temperature is set to any temperature in the range of 5 to 20 ° C., and "Y" to subtract from the first and second superheat preventing temperatures is set to any temperature within the range of 5 to 10 ° C. Is set.

The first superheat preventing temperature is set to 85 to 95 ° C, the second superheat preventing temperature is set to 55 to 75 ° C, and the third superheat preventing temperature is set to 70 to 80 ° C .

Reference numeral 7 denotes a flame detecting device, numeral 8 denotes a circulating pump driving device for controlling the driving of the circulation pump 8a, numeral 9 denotes a three-sided driving device for controlling driving of the three sides 9a, A blowing fan driving device for controlling the driving of the fan 10a, and 12 is an operating device provided with various keys.

The operation and effect of the method for preventing hot water overheating of the boiler according to the present invention will be described as follows.

First, in the boiler control device 1 to which the present invention is applied, when power supply transfer to the boiler is supplied (S1), whether or not the user uses hot water through the water flow detection device 5 installed in the hot water supply pipe or a faucet (S2).

As a result of detecting the output state of the water flow detection device 5, if the user uses the hot water, the control device 1 supplies the user with the hot water through the hot water temperature detection device 4 installed in the hot water supply pipe, (T2) of the hot water temperature (Tw) which is lower than the user's hot water set temperature + X (S3) and the hot water temperature detection device (2) provided at the outlet side of the heat exchanger (Tout) of the detected heat exchanger is lower than the set temperature of the hot water + X of the user (S4), or the temperature of the heat exchanger detected by the water temperature detection device (3) installed at the inlet side of the heat exchanger Whether the temperature Tin is lower than the second overheat preventing temperature Y or the tapping temperature Tout of the heat exchanger detected through the hot water temperature detecting device 2 is lower than the first overheating preventing temperature Y (S6).

At this time, "X" to be added to the user's hot water set temperature is set to any temperature in the range of 5 to 20 ° C., and "Y" to subtract from the first and second superheat preventing temperatures is set to any temperature within the range of 5 to 10 ° C. However, the present invention is not limited to this, and may be set to another temperature in consideration of the boiler model and the like.

If all the conditions are satisfied (Yes in all of S2 to S6), that is, if the hot water temperature Tw is lower than the hot water set temperature + X of the user, The hot water temperature Tout of the heat exchanger is lower than the hot water set temperature + X of the user and the return water temperature Tin of the heat exchanger is lower than the second superheat preventing temperature Y, The igniter 11a provided in the burner is driven through the igniter drive device 11 to operate the boiler in the hot water burning mode (S7) to continuously supply hot water to the user .

 If the user does not use the hot water (No in S2) or if the hot water temperature Tw is lower than the user's hot water temperature setting (step S6) (No at S3) or the hot water temperature (Tout) of the heat exchanger is higher than the hot water set temperature + X of the user (No at S4) or the heat exchanger temperature Tin of the heat exchanger is higher than the temperature If it is determined that the initial user uses hot water (S2 (S2) if the temperature is higher than the overheat preventing temperature -Y (No at S5) or the hot water temperature Tout of the heat exchanger is higher than the first overheat preventing temperature- ), And repeats the above steps.

On the other hand, in the control device 1, while the boiler is operated in the hot water burning mode in accordance with the user's use of hot water as described above, it is determined whether the user continues to use hot water (S8) It is determined whether the hot water temperature Tw is lower than the third overheat preventing temperature S9 and whether the return temperature Tin of the heat exchanger is lower than the second overheating preventing temperature S10.

If it is determined that any one of the conditions is not satisfied, that is, if the user stops using the hot water (No at S8) or if the hot water temperature Tw is equal to or higher than the third If the temperature of the heat exchanger is higher than the overheat preventing temperature (No at S9) or the return temperature Tin of the heat exchanger is higher than the second overheat preventing temperature (No at S10), the boiler that was operating in the hot water burning mode is forced to enter the extinguishing mode (S2) of determining whether the initial user uses the hot water.

However, if the user continues to use hot water (Yes in S8) and the hot water temperature Tw is lower than the third overheat preventing temperature (S9 If the temperature Tin of the heat exchanger is lower than the second overheat preventing temperature (Yes in S10), it is determined whether the hot water temperature Tout of the heat exchanger is lower than the first overheat preventing temperature (S12) .

When the hot water temperature Tout of the heat exchanger is compared with the first overheat preventing temperature as a result of comparison between the hot water temperature Tout of the heat exchanger and the first overheating preventing temperature (Yes in S12), the controller 1 , The process returns to step S8 where it is determined whether the hot water temperature Tw is lower than the third overheat preventing temperature while continuing the hot water combustion, and then the process is repeated.

However, when the controller 1 compares the temperature Tout of the heat exchanger and the first superheat preventing temperature of the boiler in the combustion operation in the hot water mode, the hot water temperature Tout of the heat exchanger is lower than the first superheat preventing temperature (No in S12), it is judged that the temperature has exceeded the heat exchanger outflow temperature (Tout) and the first overheat preventing temperature due to the failure of the water flow detecting device 5 such as the water flow switch or the water quantity sensor, The burner of the boiler that is being operated is forcibly extinguished and enters the extinguishing mode (S13).

In the controller 1, after the hot water temperature Tout of the heat exchanger is higher than the first overheat preventing temperature, the boiler goes into the fire extinguishing mode (S13) and then the hot water is overheated (S14), the user can accurately recognize the current state of the boiler (i.e., the hot water is overheated), and give the correct contents to the service man to take necessary measures in a short time.

In addition, in the controller 1, after the hot water temperature Tout of the heat exchanger is higher than the first overheat preventing temperature, the boiler goes into the fire extinguishing mode (S13) and the hot water is overheated (S14), it is possible to secure stability of the boiler by shutting off the driving of all the components of the boiler to stop the operation of the boiler (S15).

In the meantime, the first overheat preventing temperature used for comparison with the hot water temperature (Tout) of the heat exchanger is set at 85 to 95 DEG C. If the first overheat preventing temperature is set lower than the above-mentioned temperature, However, it may cause inconvenience to consumers' use of hot water due to frequent digestion in normal operation, and if it is set too high, it may cause problems such as overheating of the product. The temperature can be set to the first overheat preventing temperature.

The second overheat preventing temperature used for comparison and the return temperature Tin of the heat exchanger are set to be 55 to 75 DEG C. Such a second overheating preventing temperature is set to be the same as the first overheating preventing temperature and the third overheating preventing temperature It is preferable to set the temperature to be lower than the temperature.

In this case, if the second overheat preventing temperature is set to be higher than the above-mentioned temperature, there is a risk of burns. If the temperature is too lower than the above-mentioned temperature, it may be inconvenient for frequent use of hot water by consumers. Depending on the constitution, any one of 55 to 75 ° C can be set as the second overheat preventing temperature.

The third overheating prevention temperature used for comparison with the hot water temperature Tout of the heat exchanger is set at 70 to 80 DEG C. In this case, even if the third overheat preventing temperature is set higher than the above-mentioned temperature, Thus, there is no safety problem because the second overheat preventing temperature is extinguished before the hot water temperature Tw detected through the hot water temperature detecting device 4 rises.

By applying the method of the present invention as described above, it is possible to prevent the inconvenience of the consumers due to the malfunction of the hot water overheat detection in the normal operating state of the boiler (i.e., the normal operation state in the hot water mode in accordance with the user's use of hot water) It is possible to prevent overheating of the hot water caused by a failure of the water flow detecting device 5 such as a switch or a water quantity sensor so as to prevent the consumer from burning in advance and to improve the reliability of the hot water temperature control and the merchantability of the product itself Can be greatly improved.

Although the preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Which will be apparent to those skilled in the art.

1: control device 1a: computing device
2: Hot water temperature detecting device
3: Water temperature detection device
4: Hot water temperature detector
5: Water flow detection device
6:
7: Flame detector
8: pump drive device 8a: circulation pump
9: Three-way drive device 9a: Three-way
10: blower fan driving device 10a: blower fan
11: igniter drive device 11a: igniter
12: Operation device

Claims (9)

Determining whether the user uses the hot water through the water flow detection device in the control device when power supply transfer is supplied to the boiler;
When the user uses the hot water, whether the hot water temperature Tw detected through the hot water temperature detecting device is lower than the hot water set temperature + X of the user or the hot water temperature Tout of the heat exchanger detected through the hot water temperature detecting device (Tin) of the heat exchanger detected through the water-return temperature detecting device is lower than the second overheat preventing temperature (-Y), the temperature of the hot water of the heat exchanger detected by the hot water temperature detecting device Sequentially judging whether the temperature Tout is lower than the first overheat preventing temperature-Y;
And operating the boiler in a hot water combustion mode if all the conditions are satisfied.
The method according to claim 1,
When the boiler is operating in the hot water combustion mode, the control device determines whether the user continuously uses hot water, whether the hot water temperature Tw is lower than the third overheat preventing temperature, and whether the heat exchange water temperature Tin of the heat exchanger is lower than the second Determining whether the temperature is lower than the overheat preventing temperature;
If it is determined that the user has stopped using hot water or the hot water temperature Tw is higher than the third overheat preventing temperature or the return temperature Tin of the heat exchanger is higher than the second overheating preventing temperature, And returning to the step of determining whether the initial user uses hot water after entering the fire extinguishing mode.
The method of claim 2,
As a result of the determination by the control device,
If the user continues to use hot water and the hot water temperature Tw is lower than the third overheat preventing temperature and the return temperature Tin of the heat exchanger is lower than the second overheating preventing temperature, Tout) is lower than the first overheat preventing temperature;
When the hot water temperature Tout of the heat exchanger is lower than the first overheat preventing temperature, the process returns to the step of determining whether the hot water temperature Tw is lower than the third overheating preventing temperature, and when the hot water temperature Tout of the heat exchanger is lower than the first overheating Wherein the boiler is operated in the hot water combustion mode when the temperature of the hot water is higher than the preheating temperature.
The method of claim 3,
The control device which has entered the extinguishing mode of the boiler because the hot water temperature Tout of the heat exchanger is higher than the first overheat preventing temperature,
And displaying an error indicating that the hot water is in an overheated state on the display unit.
The method of claim 4,
In the control device which displays an error indicating that the boiler is in the fire extinguishing mode and the display portion is in a state where the hot water is overheated because the hot water temperature Tout of the heat exchanger is higher than the first overheat preventing temperature,
And stopping the operation of all the components of the boiler to stop the operation of the boiler.
The method according to claim 1,
Quot; X "added to the user ' s hot water set temperature is set to any one of 5 to 20 DEG C, and" Y "subtracted from the first and second superheat preventing temperatures is set to any temperature in the range of 5 to 10 DEG C Wherein the boiler is a boiler.
The method according to claim 1 or 3,
Wherein the first superheat preventing temperature is set to 85 to 95 캜.
The method according to any one of claims 1 to 3,
And the second superheat preventing temperature is set to 55 to 75 ° C.
The method of claim 2,
Wherein the third superheat preventing temperature is set to 70 to 80 캜.
KR1020150120192A 2015-08-26 2015-08-26 How to avoid overheating of the hot water boiler KR101731533B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018135797A1 (en) 2017-01-23 2018-07-26 주식회사 엘지생활건강 Pump-type toothpaste composition
CN111678254A (en) * 2020-06-03 2020-09-18 青岛海信日立空调系统有限公司 Air source heat pump unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100245420B1 (en) 1997-09-30 2000-03-02 전주범 Method for preventing overheating hot water for a gas boiler
KR100283257B1 (en) 1999-02-02 2001-02-15 김우련 A energy save feed forward and feed back boiling controlling method
KR100422856B1 (en) 2000-12-14 2004-03-12 린나이코리아 주식회사 Apparatus and method for controlling preheat of biler

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100245419B1 (en) 1997-09-30 2000-03-02 전주범 Method for preventing overheating of a gas boiler
KR101267486B1 (en) 2012-03-29 2013-05-31 린나이코리아 주식회사 Controlling method for preventing overheating of boiler

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100245420B1 (en) 1997-09-30 2000-03-02 전주범 Method for preventing overheating hot water for a gas boiler
KR100283257B1 (en) 1999-02-02 2001-02-15 김우련 A energy save feed forward and feed back boiling controlling method
KR100422856B1 (en) 2000-12-14 2004-03-12 린나이코리아 주식회사 Apparatus and method for controlling preheat of biler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018135797A1 (en) 2017-01-23 2018-07-26 주식회사 엘지생활건강 Pump-type toothpaste composition
CN111678254A (en) * 2020-06-03 2020-09-18 青岛海信日立空调系统有限公司 Air source heat pump unit

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