US3794242A - Trailer heating system - Google Patents

Trailer heating system Download PDF

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Publication number
US3794242A
US3794242A US00281048A US3794242DA US3794242A US 3794242 A US3794242 A US 3794242A US 00281048 A US00281048 A US 00281048A US 3794242D A US3794242D A US 3794242DA US 3794242 A US3794242 A US 3794242A
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US
United States
Prior art keywords
arrangement
boiler
expansion vessel
accordance
liquid
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.)
Expired - Lifetime
Application number
US00281048A
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English (en)
Inventor
M Hagdorn
T Palmeth
J Boivie
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.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
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Publication of US3794242A publication Critical patent/US3794242A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H1/2203—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners
    • B60H1/2209—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners arrangements of burners for heating an intermediate liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B60H1/00364—Air-conditioning arrangements specially adapted for particular vehicles for caravans or trailers
    • 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
    • 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
    • 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

Definitions

  • water is heated in a boiler forming .hot water which flows from the heating place in the boiler upwardly to an expansion vessel, and the water in the vessel is circulated downwardly to be cooled by radiators. Since the upward flowing column is hot water and the downward flowing column is relatively colder water, there is a difference in density of the water columns sufficient to achieve continual circulation of the water in the system.
  • heating systems of this type it is a desired objective to avoid the generation of vapor in the boiler since the generated vapor could not be used for heating purposes but would be cooled off in the expansion vessel that normally is located in an uninsulated attic. Nevertheless, vapor is essential in theascending line of the system in order to'maintain an effective circulation' of the medium transferring heat from the boiler to the radiators.
  • the circulating heating system requires two vertical liquid columns.
  • This latter liquid column would not be cooled since the radiators would be positioned in a horizontal plane. Consequently, the two vertical liquid columns would be approximately the same temperature and the circulation of the heating medium would be negligible.
  • radiators In order to cool the second vertical column in this system, radiators have to be placed at a selected height above the lower horizontal connecting part of the system. This system causes difficulty with the efficient arrangement of the radiators in the space to be heated, and therefore a central heating system with motordriven pumps that ensure an efficient circulation of liquid in the system has been substituted for the first described system.
  • Another object of the present invention is to provide a thermostatically controlled valve for adjusting the heating of the trailer.
  • a further object of the present invention is to provide a central heating system which does not require electrical power, and is provided with a burner which can operate on gaseous or liquid fuel.
  • Another object of the present invention is to provide an expansion vessel which is so constructed that substantially only liquid appears on the downwards side of the heating system.
  • An object of the present invention is to provide a relative compact heating system that has an effective air intake arrangement.
  • FIG. I is a perspective view of the central heating system mounted in a trailer and embodying the principles of our invention.
  • FIG. 2 is a perspective view of the central unit of our novel heating system drawn on a larger scale and with parts of the trailer and screen wall cut away for purposes of clarity.
  • FIG. 3 is a vertical sectional view taken through the trailer and through part of the central unit of the. heating system.
  • FIG. 4 is a perspective view on a larger scale of the expansion vessel with condenser having parts thereof cut away for purposes of clarity.
  • FIG. 5 is a side elevational view of certain details of construction of a thennostatically controlled valve arrangement of our present invention.
  • FIG. 6 is a fragmentary view of parts like those shown in FIGS. 2, 3, and 4, illustrating another embodiment of the invention.
  • FIG. 1 of the drawings shows a trailer 10 drawn schematically and supported by wheels 11 mounted on a single axle.
  • the heating system comprises a heat supply and liquid circulating unit referred to generally by the numeral 12- and a conduit 17 which circulates the liquid heating medium through a circuit close to the trailer floor 18 and at the periphery thereof adjacent to the trailer walls 21 and 22 having windows 19 and 20 and a door 23.
  • a series of radiators 13, 14, 15, and 16 are appropriately spaced and close to respective walls of the trailer 10.
  • the heating system embodying our invention is provided with a burner 24 located close to the floor 18 of the trailer 10 and which uses a fuel such as LP gas or a liquid fuel, for example kerosene or oil.
  • the burner 24 shown in FIGS. 2 and 3 is housed in an enclosure 25 which also houses means, such as control devices, and other fittings for the burner 24.
  • the aforesaid means constitutes a knob 28 which controls the gas supply and opens a by-pass valve (not shown) in the gas conduit 24a when it is desired to light the burner. In-connection with the latter, the burner 24 can be lit by means of a push button 29 for a piezoelectric lighter (not shown).
  • the enclosure 25 is also provided with a sight window 26 for observing the operation of the flame 27 of the burner 24.
  • the enclosure 25 is provided with the opening 25a to which is connected the vertical air intake conduit 30 that extends through an opening 31a in the trailer roof 31.
  • the hot gases generated by the burner 24 are conducted through a flue 32 upwards and through the roof 31 of the trailer 10 and exit through a generally circular top plate 33 which extends in a plane substantially perpendicularto the longitudinal axis of the flue 32.
  • the flue 32 is connected to an opening 32a in the enclosure 25 and passes through an opening 31b in the roof 31.
  • the hot gases from the burner 24 travel upwards in the flue 32 and laterally under circular plate 33 and out to the atmosphere.
  • the plate 33 has a downwardly projecting annular rim 34 that functions as a protection against rain being swept into the flue 32.
  • the conduit 30 is also provided with a lower, generally circular plate 36 having a downwardly projecting annular rim 35 that formsa protective roof for the air intake of the conduit 30.
  • an upwardly projecting annular flange 37 is located in the top surface of the roof 31 which functions to prevent water on the root surface from flowing into the air intake conduit 30.
  • the lower part of the flue 32 is surrounded by a jacket 38 that is filled with a liquid L.
  • This construction forms the boiler for the heating system.
  • a riser pipe 39 is connected to the upper part of the jacket 38 and has the other end thereof connected to an expansion vessel referred to generally by the numeral 40.
  • the expansion vessel 40 has a hose 41 located at the upper part thereof to ventilate the system and to permit vapor to escape to. the atmosphere in the event of an over-pressure in the system. However, the vapor will immediately condense and therefore the hose is connected to the exterior of the trailer 10 by means of a hose extension (not shown) passing through the floor 18 of the trailer 10.
  • a down pipe 43 is connected to the conduit 17 through which the liquid in the system is circulated together with the radiators 13, 14, 15, and 16, and which is connected at its other end to the lower part of the jacket 38.
  • the liquid container 44 Connected into the bottom 44a of container 44 are the riser pipe 39 and the down pipe 43. It is preferable that the liquid container 44 be constructed of a suitable durable transparent plastic material so that the liquid level in the container 44 can be observed.
  • Theupper part of the liquid container 44- is provided with an interior bayonet mount 45 and at the top thereof has a catch 46 for the upper metal sleeve 47, which is fabricated preferably of aluminum.
  • the metal sleeve 47 is retained by a cover has parts 50 fitting into the bayonet mount 45 of the liquid container 44.
  • the inner part 49 and the cover 48 are resiliently connected together by means of a yieldable annular member 51.
  • the heating system of our present invention is so constructed and arranged that there is an effective liquid circulation inasmuch as the liquid column in riser pipe 39 which comprises the jacket 38 and the riser pipe 39 is hot and contains some vapor.
  • the down pipe 43 contains substantially only hot liquid.
  • the conduit 17 through which the liquid medium is circulated extends substantially horizontally close to the floor of the trailer and does not have any significant level differences.
  • conduit 17 does not influence the flow of the liquid medium therein other than the usual flow resistance of a pipe.
  • This reliquid cooled in the radiators l3, 14, 15, and 16 and in sistance'is overcome by the driving force exerted on the liquid medium producedas a result of the density difference between the two liquid columns in the heat supply and liquid circulating unit 12. It should be apparent that our present construction achieves the. desirable operating condition in which the vapor fonned in the jacket 38 is condensed partly in the liquid in the expansion vessel 40. r
  • the-heat supply and liquid circulating unit 12 is mounted in a space between the floor 18 and the roof 31 of the trailer 10.
  • the rear of the space is provided with a heat insulated wall 52 and the sides by either heat insulated walls 53 (FIG. 2) or by heat.
  • conducting walls such as sheet metal, which are complete or partial, and which conduct some heat to the contiguous ,rooms'of a trailer. This latter construction is of value if, for example,'the contiguous room is used for drying clothes.
  • a screen 54 Located in the front of the heat supply and liquid circulating unit 12 is a screen 54.
  • An opening 55 is provided in the floor 18 of the trailer through .which cool ambient air flows into the space 56 around unit 12 (FIG. 3).
  • the air is heated by the jacket 38 and the flue 32 and to some extent by the metal sleeve 47 of the expansion vessel .40.
  • This air thus heated flows through the screen wall 54 and into the interior of the trailer 10.
  • the window 54a permits the liquid level in the transparent expansion vessel to be observed often and maintained at the desired level without removing the screen wall 54.
  • a condition may, v
  • the jacket 38 functions as a vapor generator.
  • a flue baffle (not shown) which ensuresi that the main heat quantity is emitted to the vapor generating part 57 of the flue 32. This result can be achieved by means of a pipe suspended in the flue 32 and having a flattened lower end (not shown).
  • FIG. S shovvs a thermostatically controlled valve ar' rangement for our unit 12 in which a' temperature sen-. sitive bulb 58 is placed in a suitable location in the in-. terior of the trailer 10.
  • the bulb 58 is connected to a non-return valve 42 may be provided in the circulation system. Any known kind of a valve suitable for the purpose may be used and be disposed anywhere in the system. Preferably, however, the valve is placed as shown in FIG. 6, i.e., at the end of the riser pipe 39 inside the container 44.
  • the expansion vessel being so constructed and arranged that the vapor ascending together with the liquid in the riser pipe is condensed and passes through the down pipe with its heat content being the form of a condenser.
  • thermostatically controlled valve 59 mounted in a bypass pipe 60 between portions'of the conduit 17 which short circuits the radiators 13, 14, 15, and 16.
  • the valve 59 is opened and most of: the liquid in conduit 17 will flow through by-pass pipe 60 and back to the boiler since the portion of conduit 17 provided with the radiators 'has a large flow resistance and consequently the radiators l3, 14, 15, and 16 will be short-circuited.
  • a valve 61 in the gas conduit 24a is also thermostatically controlled by means of a temperature sensitive bulb 62 located in the conduit 17 close to its connection to the bottom of jacket 38.
  • the bulb 62 measures the return liquid tem-; perature and is operatively connected to the valve 61; in order to adjust the gas supply to the burner 24, it being desirable to maintain the liquid temperature at about -7580 centigrade.
  • the foregoing thermostatically controlled valve arrangement has the desirable result of being able to adjust the heat output from the; system-in accordance with the desired heating requirements.
  • a central heating arrangement located between the floor and the ceiling of a space having a liquid heated in a boiler operated by a burner and circulated in radiator means in an open system comprising:
  • the expansion vessel having one part which is a vapor separator and liquid container and another part which is an air cooled condenser whereby vapor ascending together with the liquid in the riser pipe is condensed and its heat content supplied to the radiator means after passing through the down P p e.
  • the radiator means being positioned at or above the level ofthe burner, and
  • f. means providing heat c fimunicafionover the expansion vessel and boiler by air flow thereover to t zp tni a.
  • the air cooled condenser is a metal sleeve having an inner part and being provided with a cover.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
US00281048A 1971-08-20 1972-08-16 Trailer heating system Expired - Lifetime US3794242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7110578A SE362294C (xx) 1971-08-20 1971-08-20

Publications (1)

Publication Number Publication Date
US3794242A true US3794242A (en) 1974-02-26

Family

ID=20292546

Family Applications (1)

Application Number Title Priority Date Filing Date
US00281048A Expired - Lifetime US3794242A (en) 1971-08-20 1972-08-16 Trailer heating system

Country Status (8)

Country Link
US (1) US3794242A (xx)
CA (1) CA962983A (xx)
DE (1) DE2240146C3 (xx)
FI (1) FI55403C (xx)
FR (1) FR2150393B1 (xx)
GB (1) GB1385412A (xx)
SE (1) SE362294C (xx)
YU (1) YU34221B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332145A (en) * 1981-02-09 1982-06-01 Yuhasz Joseph M System for making frozen food article
US5871150A (en) * 1997-12-03 1999-02-16 Appalachian Truck Service, Inc. Portable tanker-trailer heating system
US20210214925A1 (en) * 2018-07-02 2021-07-15 Truma Gerätetechnik GmbH & Co. KG Frost Protection Apparatus for Water Supply Apparatus in Recreational Vehicles
CN113291219A (zh) * 2021-04-26 2021-08-24 重庆指北针建材有限公司 一种装配式保温板材车载方舱

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102700383A (zh) * 2012-06-12 2012-10-03 江苏友谊汽车有限公司 客车中基于发动机水循环的采暖系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US253389A (en) * 1882-02-07 Car-heater
US370897A (en) * 1887-10-04 searle
US1732505A (en) * 1928-05-31 1929-10-22 Dawson Edmund Expansion tank

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US253389A (en) * 1882-02-07 Car-heater
US370897A (en) * 1887-10-04 searle
US1732505A (en) * 1928-05-31 1929-10-22 Dawson Edmund Expansion tank

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332145A (en) * 1981-02-09 1982-06-01 Yuhasz Joseph M System for making frozen food article
US5871150A (en) * 1997-12-03 1999-02-16 Appalachian Truck Service, Inc. Portable tanker-trailer heating system
US20210214925A1 (en) * 2018-07-02 2021-07-15 Truma Gerätetechnik GmbH & Co. KG Frost Protection Apparatus for Water Supply Apparatus in Recreational Vehicles
US11773572B2 (en) * 2018-07-02 2023-10-03 Truma Gerätetechnik GmbH & Co. KG Frost protection apparatus for water supply apparatus in recreational vehicles
CN113291219A (zh) * 2021-04-26 2021-08-24 重庆指北针建材有限公司 一种装配式保温板材车载方舱

Also Published As

Publication number Publication date
GB1385412A (en) 1975-02-26
SE362294C (xx) 1975-03-03
FI55403B (fi) 1979-03-30
DE2240146B2 (de) 1977-08-11
FI55403C (fi) 1979-07-10
DE2240146A1 (de) 1973-03-01
FR2150393B1 (xx) 1974-01-04
YU211072A (en) 1978-09-18
SE362294B (xx) 1973-12-03
CA962983A (en) 1975-02-18
FR2150393A1 (xx) 1973-04-06
DE2240146C3 (de) 1978-03-30
YU34221B (en) 1979-02-28

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