EP2940391B1 - Freeze protection method for heating pipe and hot water pipe of boiler - Google Patents

Freeze protection method for heating pipe and hot water pipe of boiler Download PDF

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Publication number
EP2940391B1
EP2940391B1 EP13867829.7A EP13867829A EP2940391B1 EP 2940391 B1 EP2940391 B1 EP 2940391B1 EP 13867829 A EP13867829 A EP 13867829A EP 2940391 B1 EP2940391 B1 EP 2940391B1
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EP
European Patent Office
Prior art keywords
heating
hot water
boiler
pipe
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13867829.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2940391A1 (en
EP2940391A4 (en
Inventor
Young Bum Kim
Su Dae PARK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyungdong Navien Co Ltd
Original Assignee
Kyungdong Navien Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyungdong Navien Co Ltd filed Critical Kyungdong Navien Co Ltd
Publication of EP2940391A1 publication Critical patent/EP2940391A1/en
Publication of EP2940391A4 publication Critical patent/EP2940391A4/en
Application granted granted Critical
Publication of EP2940391B1 publication Critical patent/EP2940391B1/en
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Classifications

    • 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
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • 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
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/0095—Devices for preventing damage by freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—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
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/136—Defrosting or de-icing; Preventing freezing
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/305—Control of valves
    • F24H15/32—Control of valves of switching valves
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/335—Control of pumps, e.g. on-off control
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners

Definitions

  • the present invention relates to a freeze protection method for heating pipe and hot water pipe of a boiler, and, specifically, to a freeze protection method for heating pipe and hot water pipe of a boiler which can prevent a heating pipe from freezing by using a heating water temperature sensor that is disposed in the boiler and can also prevent a hot water pipe from freezing through the control of a three-way valve.
  • a circulation pump (140) forcibly circulated by a circulation pump (140) and absorbs combustion heat of a burner (160) at a heating heat exchanger (110) such that its temperature increases and then it is supplied to a heating pipe (200) by the operation of a three-way valve (120) to be used for internal heating, while during hot water use the circulation pump (140) circulates the water flowing through the inner pipe in order to supply heat absorbed at the heating heat exchanger (110) to a hot water supply heat exchanger (130) such that direct water flowing into the direct water inlet absorbs the heat retained by the hot water supply heat exchanger (130), thereby supplying hot water through the hot water outlet.
  • a circulation pump (140) circulates the water flowing through the inner pipe in order to supply heat absorbed at the heating heat exchanger (110) to a hot water supply heat exchanger (130) such that direct water flowing into the direct water inlet absorbs the heat retained by the hot water supply heat exchanger (130), thereby supplying hot water through the hot water outlet.
  • Such a boiler has a freeze protection function in which the temperature of the internal pipe water is detected through a heating water temperature sensor (150) when one is away, and if temperature of the water flowing through the inner pipe drops below the freeze protection set temperature, that is, the set temperature at which the boiler automatically operates in order to prevent freezing of the boiler when temperature of the water in the pipe drops below a certain temperature, the controller (100) operates the boiler to increase temperature of the internal pipe water as well as to circulate this water through the heating pipe (200), and the boiler is stopped if the detected temperature is above the specific set temperature.
  • This conventional freeze protection function aims only at freeze protection of the heating pipe in consideration of the low insulation effect of the existing buildings, however recent buildings have improved external insulation effect which reduces risk of the heating pipe freezing.
  • freezing of the hot water pipe frequently occurs during cold weather in winter even when lagging material is applied thereon, which increases inconveniences in using hot water.
  • Document KR 2001 0003836 A discloses a freeze protection method for a heating pipe and a hot water pipe of a boiler. This method comprises the following steps: A three-way valve is used to switch between a hot water mode and a heating mode. In the hot water mode combustion operation of the boiler is made, if temperature of the direct water pipe drops below a preset freeze protection temperature. In this situation two electric heaters heat the heating water and the direct water pipe. In the heating mode the three-way valve is operating the boiler, if temperature of the heating water is higher than the preset constant temperature.
  • This document is the closest state of the art according to the present invention and functions as a starting point for the same.
  • Patent Literature 1 Korean Patent Application No. 10-2004-0037899
  • the present invention has been made in view of the above information, and it is directed to a freeze protection method for heating pipe and hot water pipe of a boiler, which can prevent heating pipe from freezing by using a heating water temperature sensor that is disposed in the boiler and also prevent a hot water pipe from freezing through the control of a three-way valve.
  • the present invention which aims to solve the above-described technical problem comprises, a controller comprising a single-chip microcomputer to control overall operation of the boiler, a heating water temperature sensor detecting temperature of the heating water within the boiler and inputting the information into the controller, a heating heat exchanger where heat exchange between heat energy supplied from the burner and the heating water occurs, a hot water supply heat exchanger where heat exchange between heating water and direct water occurs during operation of the hot water mode, a circulation pump accelerating heat exchange by circulating the heating water, and a three-way valve switching the boiler to a heating mode or a hot water mode according to the controller's control, characterized in that the controller switches the three-way valve to a hot water mode to prevent freezing of the hot water pipe if the temperature of the heating water detected by the heating water temperature sensor falls below the preset freeze protection temperature, and switches the three-way valve to a heating mode to prevent freezing of the heating pipe if the temperature of the heating water reaches the preset combustion stop temperature.
  • the freeze protection method for heating pipe and hot water pipe of a boiler comprises the steps of: (a) converting the three-way valve into a hot water mode and carrying out a combustion operation of the boiler via a controller's control, if the temperature of heating water falls below a preset freeze protection temperature, and circulating the heating water through a closed loop including a circulation pump, a heating heat exchanger, a three-way valve and a hot water supply heat exchanger by driving the circulation pump; and (b) switching the three-way valve into a heating mode and performing an extinguishing operation of the boiler via the controller's control, if the temperature of the heating water is higher than a preset combustion stop temperature, and circulating the heating water through the heating pipe by the driving of the circulation pump.
  • it may include a further step of stopping operations of the circulation pump and the boiler if a preset certain amount of time has passed after the extinguishing operation.
  • the preset combustion stop temperature for switching the three-way valve to the heating mode at a maximum temperature that can be raised in the closed loop including the circulation pump, the heating heat exchanger, the three-way valve and the hot water supply heat exchanger.
  • freeze protection method for heating pipe and hot water pipe of a boiler Using the freeze protection method for heating pipe and hot water pipe of a boiler according to the present invention, freezing of the heating pipe as well as freezing of the hot water pipe can be prevented in advance, and the inconvenience of using hot water during winter due to the freezing of the hot water pipe can be overcome.
  • FIG. 1 is a schematic diagram showing the operation of a typical gas boiler.
  • the controller (100) which comprises a single-chip microcomputer to control overall operation of the boiler, not only controls the ignition device to allow operation of the boiler and detects ignition state of the flame detection sensor to carry out safety control such as stopping gas supply during non-ignition, but also receives boiler state information from various sensors through the sensor input unit for optimal control of the boiler in order to carry out optimal control in consideration of the operation state of the boiler and the external environment.
  • the heating pipe and the hot water pipe can be prevented from freezing by receiving the heating water temperature detected at the heating water temperature sensor (150) and comparing this with the preset temperature to control the three-way valve (120).
  • heat energy received from the burner which is at ignition state, is used to carry out heat exchange with the heating water, and in the hot water supply heat exchanger (130) heat exchange occurs between the heating water and the direct water when heating mode is operated for the boiler.
  • the three-way valve (120) is controlled by the controller (100) so that the boiler can be operated in heating mode or hot water mode.
  • the heating water heated at the heating heat exchanger (110) is supplied to the heating pipe (200) through the three-way valve (120) by the operation of the circulation pump (140), returned again, and recirculates by passing through the expansion tank (180) .
  • the circulation pump (140) returns again, and recirculates by passing through the expansion tank (180) .
  • heating water circulates through a closed loop including the heating heat exchanger (110), the three-way valve (120), the hot water supply heat exchanger (130), and the circulation pump (140).
  • FIG. 2 is a flow diagram showing the freeze protection method for heating pipe and hot water pipe of a boiler according to the present invention.
  • the freeze protection method for heating pipe and hot water pipe of a boiler of the present invention will be described in detail with reference to FIG. 2 .
  • the controller (100) first stops the boiler. That is, the fuel supplied to the burner (160) is blocked to stop combustion, and operation of the circulation pump (140) is stopped to stop circulation of the water in both the boiler and the heating pipe (200).
  • the controller (100) regularly checks the temperature detected by the heating water temperature sensor (150) to compare it with the preset freeze protection temperature.
  • the preset freeze protection temperature it is generally preferable to set the preset freeze protection temperature to a temperature at which the water in the pipe can freeze.
  • the controller (100) switches the three-way valve (120) to a hot water mode and supplies fuel to the burner (160) for combustion in order to create heat and also operates the circulation pump (140) so that the heating water absorbs heat at the heating heat exchanger (110) thereby increasing temperature of the heating water, and the heated heating water circulates through a closed loop including the circulation pump (140), the heating heat exchanger (110), the three-way valve (120), and the hot water supply heat exchanger (130).
  • the controller (100) blocks the fuel to carry out extinguishing operation and switches the three-way valve (120) to heating mode again.
  • the preset combustion stop temperature for switching the three-way valve to a heating mode at a maximum temperature that can be reached in the closed loop including the circulation pump (140), the heating heat exchanger (110), the three-way valve (120) and the hot water supply heat exchanger (130).
  • the boiler does not carry out the combustion operation after the extinguishing operation and the three-way valve (120) are switched to the heating mode. Only the circulation pump (140) is operated to circulate the heated heating water through the heating pipe (200), thereby preventing freezing of the heating pipe (200) .
  • the above method allows freeze protection of not only the heating pipe but also the hot water pipe.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
EP13867829.7A 2012-12-26 2013-09-13 Freeze protection method for heating pipe and hot water pipe of boiler Active EP2940391B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020120153945A KR101436842B1 (ko) 2012-12-26 2012-12-26 보일러의 난방배관 및 온수배관의 동파방지방법
PCT/KR2013/008315 WO2014104537A1 (ko) 2012-12-26 2013-09-13 보일러의 난방배관 및 온수배관의 동파방지방법

Publications (3)

Publication Number Publication Date
EP2940391A1 EP2940391A1 (en) 2015-11-04
EP2940391A4 EP2940391A4 (en) 2016-07-27
EP2940391B1 true EP2940391B1 (en) 2018-05-23

Family

ID=51021553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13867829.7A Active EP2940391B1 (en) 2012-12-26 2013-09-13 Freeze protection method for heating pipe and hot water pipe of boiler

Country Status (5)

Country Link
EP (1) EP2940391B1 (ko)
KR (1) KR101436842B1 (ko)
CN (1) CN104838209B (ko)
RU (1) RU2616580C2 (ko)
WO (1) WO2014104537A1 (ko)

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KR101970763B1 (ko) * 2016-06-10 2019-05-03 주식회사 경동나비엔 공기조화기의 동파방지장치 및 제어방법
JP6745039B2 (ja) * 2016-11-25 2020-08-26 株式会社ノーリツ 暖房給湯装置
RU186997U1 (ru) * 2017-06-01 2019-02-12 Лунгулло Денис Андреевич Подогревающее устройство
CN108302770A (zh) * 2018-01-18 2018-07-20 广东超人节能厨卫电器有限公司 一种零冷水燃气热水系统自动防冻方法
KR102449159B1 (ko) * 2018-05-08 2022-09-30 주식회사 경동나비엔 난방 온수 겸용 보일러 및 그 제어방법
JP7151205B2 (ja) * 2018-06-21 2022-10-12 株式会社ノーリツ 暖房熱源機
CN110056857B (zh) * 2019-04-28 2020-03-31 中国电建集团山东电力建设有限公司 高寒地区电站锅炉防冻方法
KR20210097526A (ko) * 2020-01-30 2021-08-09 엘지전자 주식회사 히트펌프 및 그 동작방법

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Also Published As

Publication number Publication date
CN104838209A (zh) 2015-08-12
KR101436842B1 (ko) 2014-09-11
KR20140085676A (ko) 2014-07-08
RU2015130307A (ru) 2017-01-31
WO2014104537A1 (ko) 2014-07-03
CN104838209B (zh) 2017-09-19
EP2940391A1 (en) 2015-11-04
EP2940391A4 (en) 2016-07-27
RU2616580C2 (ru) 2017-04-17

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