WO2023227988A1 - Expansion tank with heat accumulation - Google Patents

Expansion tank with heat accumulation Download PDF

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Publication number
WO2023227988A1
WO2023227988A1 PCT/IB2023/054864 IB2023054864W WO2023227988A1 WO 2023227988 A1 WO2023227988 A1 WO 2023227988A1 IB 2023054864 W IB2023054864 W IB 2023054864W WO 2023227988 A1 WO2023227988 A1 WO 2023227988A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
volume
expansion tank
cap
section
Prior art date
Application number
PCT/IB2023/054864
Other languages
French (fr)
Inventor
Riccardo BENETTOLO
Original Assignee
Zilmet Spa
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 Zilmet Spa filed Critical Zilmet Spa
Publication of WO2023227988A1 publication Critical patent/WO2023227988A1/en

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Classifications

    • 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
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • F24D3/1016—Tanks having a bladder
    • 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
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
    • F24D11/003—Central heating systems using heat accumulated in storage masses water heating system combined with solar energy
    • 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
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
    • F24D11/004—Central heating systems using heat accumulated in storage masses water heating system with conventional supplementary heat source
    • 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
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
    • F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/04—Gas or oil fired boiler
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/12—Heat pump
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/14—Solar energy
    • 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0278—Expansion vessels
    • 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/08—Storage tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/12—Safety or protection arrangements; Arrangements for preventing malfunction for preventing overpressure

Definitions

  • the present patent concerns hydraulic systems for heating and hot water production, and more specifically it concerns a new expansion tank with heat accumul ati on/ storage .
  • Hot water production systems can use various sources for heating water, such as boilers with gas burners, air/water heat pumps, or other renewable sources such as solar radiation or geothermal energy.
  • Hydraulic systems normally include at least one expansion and compensation tank, which has the task of compensating for variations in water volume, and is normally made up of two caps, an upper cap and a lower cap, joined together in such a way as to define an internal volume.
  • Said internal volume is divided into two parts by a membrane, wherein the upper part, or water section, is in hydraulic communication with the system and is intended to contain part of the water contained in the system, while the lower part, or gas section, is filled with gas.
  • the membrane is elastic and adapts to the volume/pressure variation within said water section.
  • Hydraulic systems are also connected to various user units, such as radiators or underfloor heating pipes, etc.
  • Hydraulic systems often also include at least one buffer tank, that is, a technical water storage tank, which serves for storing the excess heat produced by the sources, for example a boiler or an air/water heat pump, in the form of hot water which is made available according to the requirements of the system.
  • a buffer tank that is, a technical water storage tank, which serves for storing the excess heat produced by the sources, for example a boiler or an air/water heat pump, in the form of hot water which is made available according to the requirements of the system.
  • a buffer tank usually comprises at least one inlet line and at least one outlet line.
  • Buffer tanks containing a heat exchange coil are also known, in which, for example, water coming from a solar thermal system circulates.
  • the subject of the present patent is a new type of expansion tank with a thermal flywheel, which thus serves both the function of a normal expansion tank and that of a buffer tank or storage tank.
  • the new expansion tank comprises a tank internally divided into two volumes by at least one fixed partition.
  • a first volume which therefore has fixed dimensions, is intended to be connected to the hydraulic system and to contain water, acting as a storage tank.
  • the second volume is in turn divided into two parts by means of an elastic membrane, wherein a first part, or water section, is intended to be hydraulically connected to the hydraulic system and filled with water from the system, while the second part, or gas section, is intended to be filled with gas at a predetermined pressure.
  • the volume of said water section therefore varies according to the variations in the volume of the water circulating in the system, which are compensated for by the elastic membrane and by corresponding variations in the volume of the gas section.
  • Said water section is in hydraulic communication with said first volume, for example by means of a simple hole made in said fixed partition between said first volume and said second volume.
  • a single device therefore, integrates both the functions of a normal storage tank and the functions of a normal expansion tank.
  • the new expansion tank with thermal flywheel can be conveniently installed in a hydraulic heating and hot sanitary water production system.
  • the system in which the new expansion tank with thermal flywheel is installed comprises: at least one hot water production device such as, for example, an air/water heat pump or a solar thermal system or a boiler or the like; a circuit for water circulation, connected to said at least one hot water production device; at least one user unit connected to said circuit such as, for example, one or more radiators and/or an underfloor heating circuit or the like; said at least one expansion tank with thermal flywheel, connected to said hydraulic circuit and suited to receive the incoming hot water from said at least one hot water production device and/or the water returning from said user units, and to convey water to said one or more user units and/or to said at least one hot water production device.
  • at least one hot water production device such as, for example, an air/water heat pump or a solar thermal system or a boiler or the like
  • a circuit for water circulation connected to said at least one hot water production device
  • at least one user unit connected to said circuit such as, for example, one or more radiators and/or an underfloor heating circuit or the like
  • Figure 1 shows a sectional view of the new expansion tank with thermal flywheel (1), provided with a membrane (7) in a first position determined by a given pressure value inside the water section (62), while Figure 2 shows a sectional view of the same expansion tank (1) shown in Figure 1, where the membrane (7) is in a second position, determined by a higher pressure value inside the water section (62).
  • the new expansion tank with thermal flywheel (1) comprises: an upper cap (2), an intermediate cap (3), joined to said upper cap (2) in such a way as to define a first volume (4) intended to contain water; a lower cap (5), externally joined to said intermediate cap (3), and wherein a second volume (6) is defined between the side (31) of the intermediate cap (3) and the side (51) of the lower cap (5), said second volume (6) being in turn divided into two parts (61, 62) by at least one elastic membrane (7).
  • Said intermediate cap (3) thus acts as a separating element between the first volume (4), where the water storage takes place, and the second volume (6), where the volume compensation of the system’s water takes place.
  • the part of the volume defined between said membrane (7) and said lower cap (5), or gas section (61), is intended to be filled with gas, while the part of the volume defined between said membrane (7) and said intermediate cap (3), or water section (62), is intended to be filled with water.
  • the side (31) of said intermediate cap (3) is provided with at least one opening that places said first volume (4) in communication with said water section (62), whose volume is adaptable thanks to the presence of the membrane (7).
  • a preloading valve (52) is mounted on the side (51) of the lower cap (5) to adjust the pressure value inside said gas section.
  • At least two fittings for connection to the hydraulic system, respectively for the inlet of water into said first volume and for the outlet of water from said first volume (4), are mounted on the sides (21) of said upper cap (2) and/or of said intermediate cap (3).
  • the figure shows that, for example, four fittings (22, 23, 32, 33) can be provided, two for the inlet of water into the first volume (4), two for the outlet of water from the first volume (4).
  • At least said upper cap (2) and said intermediate cap (3) have heat-insulated sides (21, 31).
  • the inside of the tank (1) is heat-insulated and includes, for example, a heat insulating outer casing (8) that encloses it entirely.
  • the air volume can vary between 10 and 30% and the water volume can vary between 90 and 70%.
  • the tank (1) has an overall volume intended to be filled with water and resulting from the union of the first fixed volume (4) with the water section (62), whose volume is variable and adaptable.
  • the new tank (1) thus simultaneously serves the two functions of thermal storage tank and expansion tank.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

The invention is an expansion tank (1) comprising a tank internally divided into at least two volumes (4, 6) by at least one fixed partition (31), and wherein a first volume (4) is intended to be connected to a hydraulic system and to contain water, thus acting as a storage tank, while the second volume (6) is in turn divided into two parts by means of a membrane (7), wherein a first part, or water section (62), is intended to be hydraulically connected to said hydraulic system and filled with water from the system, while the second part, or gas section (61), is intended to be filled with gas at a given pressure, and wherein said water section (62) is in hydraulic communication with said first volume (4).

Description

TITLE
EXPANSION TANK WITH HEAT ACCUMULATION DESCRIPTION
The present patent concerns hydraulic systems for heating and hot water production, and more specifically it concerns a new expansion tank with heat accumul ati on/ storage .
Hot water production systems can use various sources for heating water, such as boilers with gas burners, air/water heat pumps, or other renewable sources such as solar radiation or geothermal energy.
Hydraulic systems normally include at least one expansion and compensation tank, which has the task of compensating for variations in water volume, and is normally made up of two caps, an upper cap and a lower cap, joined together in such a way as to define an internal volume. Said internal volume is divided into two parts by a membrane, wherein the upper part, or water section, is in hydraulic communication with the system and is intended to contain part of the water contained in the system, while the lower part, or gas section, is filled with gas. The membrane is elastic and adapts to the volume/pressure variation within said water section.
Hydraulic systems are also connected to various user units, such as radiators or underfloor heating pipes, etc.
Hydraulic systems often also include at least one buffer tank, that is, a technical water storage tank, which serves for storing the excess heat produced by the sources, for example a boiler or an air/water heat pump, in the form of hot water which is made available according to the requirements of the system.
A buffer tank usually comprises at least one inlet line and at least one outlet line. Buffer tanks containing a heat exchange coil are also known, in which, for example, water coming from a solar thermal system circulates. The subject of the present patent is a new type of expansion tank with a thermal flywheel, which thus serves both the function of a normal expansion tank and that of a buffer tank or storage tank.
The new expansion tank comprises a tank internally divided into two volumes by at least one fixed partition. A first volume, which therefore has fixed dimensions, is intended to be connected to the hydraulic system and to contain water, acting as a storage tank.
The second volume is in turn divided into two parts by means of an elastic membrane, wherein a first part, or water section, is intended to be hydraulically connected to the hydraulic system and filled with water from the system, while the second part, or gas section, is intended to be filled with gas at a predetermined pressure. The volume of said water section therefore varies according to the variations in the volume of the water circulating in the system, which are compensated for by the elastic membrane and by corresponding variations in the volume of the gas section.
Said water section is in hydraulic communication with said first volume, for example by means of a simple hole made in said fixed partition between said first volume and said second volume.
A single device, therefore, integrates both the functions of a normal storage tank and the functions of a normal expansion tank.
The new expansion tank with thermal flywheel can be conveniently installed in a hydraulic heating and hot sanitary water production system.
The system in which the new expansion tank with thermal flywheel is installed comprises: at least one hot water production device such as, for example, an air/water heat pump or a solar thermal system or a boiler or the like; a circuit for water circulation, connected to said at least one hot water production device; at least one user unit connected to said circuit such as, for example, one or more radiators and/or an underfloor heating circuit or the like; said at least one expansion tank with thermal flywheel, connected to said hydraulic circuit and suited to receive the incoming hot water from said at least one hot water production device and/or the water returning from said user units, and to convey water to said one or more user units and/or to said at least one hot water production device.
The characteristics of the new expansion tank with thermal flywheel and of the system including the invention are clarified in greater detail in the following description making reference to the drawing that is attached hereto by way of nonlimiting example.
Figure 1 shows a sectional view of the new expansion tank with thermal flywheel (1), provided with a membrane (7) in a first position determined by a given pressure value inside the water section (62), while Figure 2 shows a sectional view of the same expansion tank (1) shown in Figure 1, where the membrane (7) is in a second position, determined by a higher pressure value inside the water section (62).
In a preferred, particularly effective solution, the new expansion tank with thermal flywheel (1) comprises: an upper cap (2), an intermediate cap (3), joined to said upper cap (2) in such a way as to define a first volume (4) intended to contain water; a lower cap (5), externally joined to said intermediate cap (3), and wherein a second volume (6) is defined between the side (31) of the intermediate cap (3) and the side (51) of the lower cap (5), said second volume (6) being in turn divided into two parts (61, 62) by at least one elastic membrane (7). Said intermediate cap (3) thus acts as a separating element between the first volume (4), where the water storage takes place, and the second volume (6), where the volume compensation of the system’s water takes place.
The part of the volume defined between said membrane (7) and said lower cap (5), or gas section (61), is intended to be filled with gas, while the part of the volume defined between said membrane (7) and said intermediate cap (3), or water section (62), is intended to be filled with water.
For this purpose, according to the invention, the side (31) of said intermediate cap (3) is provided with at least one opening that places said first volume (4) in communication with said water section (62), whose volume is adaptable thanks to the presence of the membrane (7).
A preloading valve (52) is mounted on the side (51) of the lower cap (5) to adjust the pressure value inside said gas section.
At least two fittings for connection to the hydraulic system, respectively for the inlet of water into said first volume and for the outlet of water from said first volume (4), are mounted on the sides (21) of said upper cap (2) and/or of said intermediate cap (3).
The figure shows that, for example, four fittings (22, 23, 32, 33) can be provided, two for the inlet of water into the first volume (4), two for the outlet of water from the first volume (4).
At least said upper cap (2) and said intermediate cap (3) have heat-insulated sides (21, 31). In the preferred solution, shown for example in Figures 1 and 2, the inside of the tank (1) is heat-insulated and includes, for example, a heat insulating outer casing (8) that encloses it entirely.
In the preferred solution, all the sides of the expansion tank with thermal flywheel, and thus also said lower cap (5), are insulated.
In the new expansion tank, the air volume can vary between 10 and 30% and the water volume can vary between 90 and 70%.
In essence, the tank (1) has an overall volume intended to be filled with water and resulting from the union of the first fixed volume (4) with the water section (62), whose volume is variable and adaptable. The new tank (1) thus simultaneously serves the two functions of thermal storage tank and expansion tank.
Therefore, with reference to the above description and the attached drawings, the following claims are made.

Claims

1. Expansion tank (1), characterized in that it comprises a tank internally divided into at least two volumes (4, 6) by at least one fixed partition (31), and wherein: a first volume (4) is intended to be connected to a hydraulic system and to contain water, thus acting as a storage tank,
- the second volume (6) is in turn divided into two parts by means of a membrane (7), wherein a first part, or water section (62), is intended to be hydraulically connected to said hydraulic system and filled with water from the system, while the second part, or gas section (61), is intended to be filled with gas at a given pressure, and wherein said water section (62) is in hydraulic communication with said first volume (4).
2. Expansion tank (1) according to claim 1, characterized in that it comprises: an upper cap (2), an intermediate cap (3), joined to said upper cap (2) in such a way as to form said first volume (4) intended to contain water; a lower cap (5), externally joined to said intermediate cap (3), and wherein said second volume (6) is defined between the partition (31) of the intermediate cap (3) and the side (51) of the lower cap (5), said second volume (6) being in turn divided into said two parts, the gas section and the water section (61, 62), by at least one elastic membrane (7), and wherein the partition (31) of said intermediate cap (3) is provided with at least one opening which places said first volume (4) in communication with said water section (62).
3. Expansion tank (1) according to claim 2, characterized in that a preloading valve (52) is mounted on the side (51) of said lower cap (5).
4. Expansion tank (1) according to claim 2, characterized in that on the sides (21) of said upper cap (2) and/or of said intermediate cap (3) there are at least two fittings (22, 23, 32, 33), respectively for the inlet of water into the first volume (4) and for the outlet of water from the first volume (4).
5. Expansion tank (1) according to claim 4, characterized in that at least four fittings (22, 23, 32, 33) are mounted on the sides (21) of said upper cap (2) and/or of said intermediate cap (3): at least two for the inlet of water into the first volume (4) and at least two for the outlet of water from the first volume (4).
6. Expansion tank (1) according to claim 2, characterized in that at least said upper cap (2) and said intermediate cap (3) are provided with heat-insulated sides (21, 31).
7. Expansion tank (1) according to claim 6, characterized in that it comprises a heat insulating outer casing (8) enclosing said upper, intermediate, and lower caps (2, 3, 5).
8. Expansion tank (1) according to any of the preceding claims, characterized in that it is sized in such a way that the air volume can vary between 10 and 30% and the water volume can vary between 90 and 70%.
9. Hydraulic system for the production of hot water, comprising: at least one device suited to produce hot water such as, for example, an airwater heat pump or a solar thermal system or a boiler or the like; a circuit for the circulation of water, connected to said at least one device for producing hot water; at least one user unit connected to said circuit such as, for example, one or more radiators and/or an underfloor heating circuit or the like; characterized in that it comprises said at least one expansion tank (1) according to one or more of the preceding claims, connected to said hydraulic circuit and suited to receive the hot water coming from said at least one device for producing hot water and/or returning from said user units, and to convey water to said one or more user units and/or to said at least one device for producing hot water.
PCT/IB2023/054864 2022-05-23 2023-05-11 Expansion tank with heat accumulation WO2023227988A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102022000010670 2022-05-23
IT202200010670 2022-05-23

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2806610A1 (en) * 1977-03-08 1978-09-14 Maya Dynamics Ltd Liquid container with two indirect heat exchangers - one connected to receive fluid from a solar energy collector
DE29902347U1 (en) * 1998-03-20 1999-05-27 OTTO HEAT Heizungs-, Energie- und Anlagentechnik GmbH & Co. KG, 57482 Wenden Combined expansion and heating water expansion tank
DE102004001035A1 (en) * 2004-01-03 2005-08-04 Norbert Volkmann Diaphragm expansion tank integrating method for drinking-water storage tank, involves integrating expansion tank with heat insulation of storage tank of heating system for admitting storage of drinking water
EP2672192A1 (en) * 2011-02-01 2013-12-11 Choi, Jin-min Nitrogen expansion tank for boiler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2806610A1 (en) * 1977-03-08 1978-09-14 Maya Dynamics Ltd Liquid container with two indirect heat exchangers - one connected to receive fluid from a solar energy collector
DE29902347U1 (en) * 1998-03-20 1999-05-27 OTTO HEAT Heizungs-, Energie- und Anlagentechnik GmbH & Co. KG, 57482 Wenden Combined expansion and heating water expansion tank
DE102004001035A1 (en) * 2004-01-03 2005-08-04 Norbert Volkmann Diaphragm expansion tank integrating method for drinking-water storage tank, involves integrating expansion tank with heat insulation of storage tank of heating system for admitting storage of drinking water
EP2672192A1 (en) * 2011-02-01 2013-12-11 Choi, Jin-min Nitrogen expansion tank for boiler

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