US1884898A - Air circulating and temperature changing unit - Google Patents

Air circulating and temperature changing unit Download PDF

Info

Publication number
US1884898A
US1884898A US450423A US45042330A US1884898A US 1884898 A US1884898 A US 1884898A US 450423 A US450423 A US 450423A US 45042330 A US45042330 A US 45042330A US 1884898 A US1884898 A US 1884898A
Authority
US
United States
Prior art keywords
air
fan
temperature changing
changing unit
air circulating
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
US450423A
Inventor
Jr Herman William Smith
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US450423A priority Critical patent/US1884898A/en
Application granted granted Critical
Publication of US1884898A publication Critical patent/US1884898A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/0233—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with air flow channels
    • F28D1/024—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with air flow channels with an air driving element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/228—Heat exchange with fan or pump
    • Y10S165/302—Rotary gas pump
    • Y10S165/303—Annular heat exchanger

Definitions

  • This invention relates to a unitary structure or assembly, one or more of wh chns adapted to be placed as individual units in any desired independent positions to function as either heaters or coolers of air and to circulate this thermally treated a1r from and to any desired points.
  • One ofv the objects of the invention is provide a compactand efiicient umt of this character and one in which the air s drawn into and discharged from said unit in the most advantageous direction.
  • Another object of the invention is to provlde that the currents of air are swept against the thermal transfer member in the direction which causes the greatest thermal effect with the least frictional resistance.
  • Figure 1 is a vertical, longitudinal medial section through one form of my invention.
  • Figure 2 is a horizontal, transverse section thereof taken on line 2-2, Fig. 1.
  • Figure 3 is a vertical, longitudinal medial section similar to Fig. 1 but showing a modified form of the invention.
  • Figure 4 is a horizontal, transverse section thereof taken on line 4-4, Fig.
  • Figure 5 is a vertical, longitudinal medial section throu h another modified form of the invention.
  • Figure 6 is a side elevation thereof.
  • Figure 7 is a horizontal transverse section of another modified form of the invention.
  • Figure 8 is a vertical, medial section through another modified form of the invention.
  • My invention may be embodied in various forms and in air circulating and temperature changing unitsof different constructions, and the present applications are therefore to be regarded merely as some of the possible organizations which satisfactorily carry out the invention in practice.
  • the invention is constructed as follows, taking up for the present only the construction illustrated in Figs. 1 and 2.
  • the numeral 10 represents an electric motor or other simple compact source of power' in place of which may be used, if vdesired, a turbine or other similar fluid driven prime mover.
  • the shaft 11 of said motor projects longitudinally and vertically downward from the motor 10 proper and has secured thereto a centrifugal fan 12, the hub 13 of which is located above the central part of the fan and in proximity to the adjacent supporting bearing of the motor 10.
  • the lower inner parts of the blades of said centrifugal fan 12 are cut away at 14 to permit the free pas- ;age of air into the central portion of said
  • the lower peripheral portion of the motor 10 is provided with an annular flange 15 to the lower face of which is secured by bolts 16 or otherwise an upper chamber wall 17 constructed of heavy sheet metal and constituting the upper horizontal wall of a fan chamber 18, the vertical, curved wall 20 of which is parallel to the axis of the fan while the lower wall 21 of which is horizontal and is cut away to form an annular opening 22 to permit the ingress of air into the interior of said fan chamber 18.
  • a suction tube or air inlet duct 23 Adjacent said opening 22 and secured to the lower horizontal wall 21 of the fan chamher is a suction tube or air inlet duct 23 which ermits air to be drawn into said fan chamer from a region more or less remote therefrom.
  • said air inlet 'duct 23 will draw cool air from the low er parts of the room.
  • the curved vertical wall 20 is cut away'to allow the fan to discharge air therethrough into an outlet tube or air discharge duct 25, from whence the air issues in a normally horizontal direction and is discharged under pressure to a region remote from the unit.
  • thermal transfer member Secured suitably to the main frame of the unit is a thermal transfer member which in the illustrations is shown as a helical pipe coil 26 whose axis is preferably though not necessaril concentric with the axis of the fan 12. Aid coil is provided throughout its length with thermal radiating fins 27 which may be either of disk form or constructed in one spiral band as shown. In either case, however, the plane of said fins is perpendicular to the axis of the coil 26 and hence is approximately parallel to a plane passing through the axis of the fan.
  • a heating coil from any suitable source of thermally potential power.
  • Suitable pipe couplings or unions 30 and 300 are provided at opposite termini of said coil 26 to permit of detachably connecting said coil with the source of thermal power. If the latter is in the form of electrical power, an electrical resistance wire is preferably used instead of a pipe but the radiating fins 27 are retained as before and in this case the pipe or wire is suitably insulated from the frame of the unit.
  • the whole unit as shown in Fig. 1 is preferably inverted so as to suck into the unit the warmer air to be found in the upper strata of the room.
  • a suitable refrigerant such as carbon dioxide, ammonia gas, or a cool liquid such as brine, etc. this cool source of thermally potential power being coupled up with the pipe unions 30 and 300 as before.
  • Figures 3 and 4 show a modified form of the invention in which the vertical, curved wall 20 and air discharge duct 25 are omitted, the discharged air passing directly lateral- 1y from the chamber 180 against the coil 26 and its radiating fins 27 and thence into the surrounding atmosphere.
  • the upper and lower walls 170 and 210 of the chamber 180 are connected together by a plurality of securing bolts 31 whose shanks are disposed within the bores or hollow interiors of a plurality of companion tubular spacers 32.
  • FIG. 5 and 6 Another modified form of the invention asaeee is shown in Figs. 5 and 6.
  • a propeller type of fan 121 is employed and turns about a horizontal shaft 33 rotated by a suitable motor or other source of mechanical power 101.
  • the axis of the helical thermal transfer coil 261 is concentric with the axis of fan and motor, but the coil itself is in this case around the motor instead of around the periphery of the fan.
  • This makes a more compact construction which is very suitable for certain hestallations. It'will be noted that in this construction, the air is drawn radially inward against the thermal transfer coil 261 and thence passes to the fan which discharges the same directly into the atmosphere.
  • Fig. 7 is shown another modified form of the invention analogous to the construction of Fig. 2, but having two outlets 10 and 11 arranged at 180 relatively to each other.
  • Fig. 8 is shown another modified form of the invention analogous to the construction of Fig. 5 but using a centrifugal fan 42 instead of a propeller fan.
  • said centrifugal fan is constructed of vanes which lie in planes which are longitudinal of the axis of rotation and which extend radially out from the hub 43 of said fan and then project longitudinally forward in proximity to the heating element 44. It is obvious that the direction of air fiow in this construction is opposite to that shown in Fig. 5.
  • An air circulating and temperature changing unit comprising a frame and a motor secured thereto; a fan driven by said motor; a vertical air inlet duct arranged at the lower part of said frame; a horizontal air discharge duct arranged upon the side of said frame; an annular thermal transfer member connected with a source of thermal power and secured to said frame; and conducting means for directing air from said inlet duct and radially against said thermal transfer member and through said fan and into said discharge duct.
  • An air circulating and temperature changing unit comprising a frame and a motor secured thereto having a vertical axis; a centrifugal fan disposed coaxially below said motor and driven thereby; a vertical air inlet duct arranged coaxially below said fan; a
  • helical thermal transfer element having a vertical axis and disposed in proximity to the periphery of said fan; fins and said element disposed radially parallel to the axis of said fan; a casing around said fan; an air exhaust duct extending horizontally out from the side of said casing; means for providing said thermal transfer element with thermally potential fluid; and means for turning the whole unit about its generally vertical axis so as to alter the direction of air flow from the horizontal air discharge duct.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Get. 25, 1932; H. w. SMITH, JR
AIR CIRCULATING AND TEMPERATURE CHANGING UNIT Filed May '7, 1930 2 Sheets-Sheet l Oct. 25, 1932.
H. W. SMITH, JR
AIR CIRCULATING AND TEMPERATURE CHANGING UNIT Filed May 7, 1950 2 Sheets-Sheet 2 lllll wi, 4 WWW Patented Oct. 25, 1932 UNITED STATES PATENT OFFICE mm WILLIAM SMITH, JR., SCHENEC'IADY, NEW YORK, ASSIGNOB '10 :rosnrn PORZEL, OI LOOKPOBT, NEW YORK AIR GIRCULATING AND TEMPERATURE CHANGING UNIT Application filed May 7, 1980. Serial No. 450,423.
- This invention relates to a unitary structure or assembly, one or more of wh chns adapted to be placed as individual units in any desired independent positions to function as either heaters or coolers of air and to circulate this thermally treated a1r from and to any desired points. One ofv the objects of the invention is provide a compactand efiicient umt of this character and one in which the air s drawn into and discharged from said unit in the most advantageous direction. Another object of the invention is to provlde that the currents of air are swept against the thermal transfer member in the direction which causes the greatest thermal effect with the least frictional resistance. Further numerous objects and advantages of the invention are disclosed in detail in the following description, where- In the accompanying drawings: Figure 1 is a vertical, longitudinal medial section through one form of my invention. Figure 2 is a horizontal, transverse section thereof taken on line 2-2, Fig. 1. Figure 3 is a vertical, longitudinal medial section similar to Fig. 1 but showing a modified form of the invention. Figure 4 is a horizontal, transverse section thereof taken on line 4-4, Fig.
l 3. Figure 5 is a vertical, longitudinal medial section throu h another modified form of the invention. Figure 6 is a side elevation thereof. Figure 7 is a horizontal transverse section of another modified form of the invention. Figure 8 is a vertical, medial section through another modified form of the invention.
In the following description, similar characters of reference indicate like parts in the several figures of the drawings.
My invention may be embodied in various forms and in air circulating and temperature changing unitsof different constructions, and the present applications are therefore to be regarded merely as some of the possible organizations which satisfactorily carry out the invention in practice. As here shown the invention is constructed as follows, taking up for the present only the construction illustrated in Figs. 1 and 2.
The numeral 10 represents an electric motor or other simple compact source of power' in place of which may be used, if vdesired, a turbine or other similar fluid driven prime mover. The shaft 11 of said motor projects longitudinally and vertically downward from the motor 10 proper and has secured thereto a centrifugal fan 12, the hub 13 of which is located above the central part of the fan and in proximity to the adjacent supporting bearing of the motor 10. The lower inner parts of the blades of said centrifugal fan 12 are cut away at 14 to permit the free pas- ;age of air into the central portion of said The lower peripheral portion of the motor 10 is provided with an annular flange 15 to the lower face of which is secured by bolts 16 or otherwise an upper chamber wall 17 constructed of heavy sheet metal and constituting the upper horizontal wall of a fan chamber 18, the vertical, curved wall 20 of which is parallel to the axis of the fan while the lower wall 21 of which is horizontal and is cut away to form an annular opening 22 to permit the ingress of air into the interior of said fan chamber 18.
Adjacent said opening 22 and secured to the lower horizontal wall 21 of the fan chamher is a suction tube or air inlet duct 23 which ermits air to be drawn into said fan chamer from a region more or less remote therefrom. For instance, assuming the unit to be used in the vertical position of Fig. 1, said air inlet 'duct 23 will draw cool air from the low er parts of the room. At 24, the curved vertical wall 20 is cut away'to allow the fan to discharge air therethrough into an outlet tube or air discharge duct 25, from whence the air issues in a normally horizontal direction and is discharged under pressure to a region remote from the unit.
Secured suitably to the main frame of the unit is a thermal transfer member which in the illustrations is shown as a helical pipe coil 26 whose axis is preferably though not necessaril concentric with the axis of the fan 12. aid coil is provided throughout its length with thermal radiating fins 27 which may be either of disk form or constructed in one spiral band as shown. In either case, however, the plane of said fins is perpendicular to the axis of the coil 26 and hence is approximately parallel to a plane passing through the axis of the fan. I-Ience, as air is thrown out more or less radially from said fan, said air is caused to move approximately parallel to said fins 27 and yet at a sufiiciently acute angle thereto (due to the tangential component of the air stream) as to be forcibly impinged against the flat faces of said fin. In actual practice, this arrangement has been found to provide a very high rate of thermal transfer.
In the position of Fig. 1, it is assumed that the air passing through the unit is being heated in which case cold air is drawn up from the lower air strata of the room. In such case steam, hot water, etc., is fed into What in this case is a heating coil from any suitable source of thermally potential power. Suitable pipe couplings or unions 30 and 300 are provided at opposite termini of said coil 26 to permit of detachably connecting said coil with the source of thermal power. If the latter is in the form of electrical power, an electrical resistance wire is preferably used instead of a pipe but the radiating fins 27 are retained as before and in this case the pipe or wire is suitably insulated from the frame of the unit.
When it is desired to cool the air instead of warming it, the whole unit as shown in Fig. 1 is preferably inverted so as to suck into the unit the warmer air to be found in the upper strata of the room. In such a case a suitable refrigerant is used such as carbon dioxide, ammonia gas, or a cool liquid such as brine, etc. this cool source of thermally potential power being coupled up with the pipe unions 30 and 300 as before.
Figures 3 and 4 show a modified form of the invention in which the vertical, curved wall 20 and air discharge duct 25 are omitted, the discharged air passing directly lateral- 1y from the chamber 180 against the coil 26 and its radiating fins 27 and thence into the surrounding atmosphere. In this case the upper and lower walls 170 and 210 of the chamber 180 are connected together by a plurality of securing bolts 31 whose shanks are disposed within the bores or hollow interiors of a plurality of companion tubular spacers 32.
Another modified form of the invention asaeee is shown in Figs. 5 and 6. In this case a propeller type of fan 121 is employed and turns about a horizontal shaft 33 rotated by a suitable motor or other source of mechanical power 101. In this case also the axis of the helical thermal transfer coil 261 is concentric with the axis of fan and motor, but the coil itself is in this case around the motor instead of around the periphery of the fan. This makes a more compact construction which is very suitable for certain hestallations. It'will be noted that in this construction, the air is drawn radially inward against the thermal transfer coil 261 and thence passes to the fan which discharges the same directly into the atmosphere.
In Fig. 7 is shown another modified form of the invention analogous to the construction of Fig. 2, but having two outlets 10 and 11 arranged at 180 relatively to each other.
In Fig. 8 is shown another modified form of the invention analogous to the construction of Fig. 5 but using a centrifugal fan 42 instead of a propeller fan. In this case said centrifugal fan is constructed of vanes which lie in planes which are longitudinal of the axis of rotation and which extend radially out from the hub 43 of said fan and then project longitudinally forward in proximity to the heating element 44. It is obvious that the direction of air fiow in this construction is opposite to that shown in Fig. 5.
While in the foregoing description the different forms of the invention have been termed modifications, they are in reality and as viewed from the commercial viewpoint, specific adaptations of the invention for use under various installation conditions. With this in mind, it will be obvious that this invention as a practical unit for the circulation and the changing of temperature of air under any and all installation conditions has genuine practical merit due to its unusual simplicity, low cost and operating efficiency.
I claim as my invention:
1. An air circulating and temperature changing unit comprising a frame and a motor secured thereto; a fan driven by said motor; a vertical air inlet duct arranged at the lower part of said frame; a horizontal air discharge duct arranged upon the side of said frame; an annular thermal transfer member connected with a source of thermal power and secured to said frame; and conducting means for directing air from said inlet duct and radially against said thermal transfer member and through said fan and into said discharge duct.
2. An air circulating and temperature changing unit comprising a frame and a motor secured thereto having a vertical axis; a centrifugal fan disposed coaxially below said motor and driven thereby; a vertical air inlet duct arranged coaxially below said fan; a
Ill)
helical thermal transfer element having a vertical axis and disposed in proximity to the periphery of said fan; fins and said element disposed radially parallel to the axis of said fan; a casing around said fan; an air exhaust duct extending horizontally out from the side of said casing; means for providing said thermal transfer element with thermally potential fluid; and means for turning the whole unit about its generally vertical axis so as to alter the direction of air flow from the horizontal air discharge duct.
In testimony whereof I hereby aifix my signature.
HERMAN WILLIAM SMITH, J R.
US450423A 1930-05-07 1930-05-07 Air circulating and temperature changing unit Expired - Lifetime US1884898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US450423A US1884898A (en) 1930-05-07 1930-05-07 Air circulating and temperature changing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US450423A US1884898A (en) 1930-05-07 1930-05-07 Air circulating and temperature changing unit

Publications (1)

Publication Number Publication Date
US1884898A true US1884898A (en) 1932-10-25

Family

ID=23788036

Family Applications (1)

Application Number Title Priority Date Filing Date
US450423A Expired - Lifetime US1884898A (en) 1930-05-07 1930-05-07 Air circulating and temperature changing unit

Country Status (1)

Country Link
US (1) US1884898A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479102A (en) * 1946-02-23 1949-08-16 Carnegie Illinois Steel Corp Coil annealing furnace
US2564257A (en) * 1947-11-21 1951-08-14 8600 Denison Company Forced air, fuel fired heater with scroll enclosed multiple annular heat transfer element
US2581709A (en) * 1950-01-21 1952-01-08 William J Rogers Air cooling system for tents or canopies
US2673074A (en) * 1952-08-04 1954-03-23 Joe W Dailey Cooling unit for refrigerator systems
US2673403A (en) * 1950-08-18 1954-03-30 Fagioli Emilio Device for drying materials by means of ventilation
DE969589C (en) * 1950-08-18 1958-06-19 Ercole Marelli & Co Societa Pe Chamber dryer
US2898841A (en) * 1954-02-01 1959-08-11 Knutson Harold Air scupper
US3279209A (en) * 1964-04-15 1966-10-18 Laing Vortex Inc Cross flow machines and air conditioner units incorporating such machines
US3978919A (en) * 1974-03-20 1976-09-07 Hans List Cooler-cum-blower assembly for internal combustion engines
US4086886A (en) * 1974-07-25 1978-05-02 Motoren- Und Turbinen-Union Friedrichshafen Gmbh Cooling installation
US6588228B2 (en) * 2001-11-08 2003-07-08 Samsung Electronics Co., Ltd. Integrated air conditioner with a fan casing
US20060120045A1 (en) * 2002-05-31 2006-06-08 Jan Van Der Werff Cooling of electrical and/or electronic components, specifically computer equipment
US20080257336A1 (en) * 2007-04-03 2008-10-23 Trane International, Inc. Furnace with Integrated Blower Housing and Heat Exchanger
US7677237B2 (en) 2007-04-03 2010-03-16 Trane International Inc. Furnace with integrated blower housing and heat exchanger

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479102A (en) * 1946-02-23 1949-08-16 Carnegie Illinois Steel Corp Coil annealing furnace
US2564257A (en) * 1947-11-21 1951-08-14 8600 Denison Company Forced air, fuel fired heater with scroll enclosed multiple annular heat transfer element
US2581709A (en) * 1950-01-21 1952-01-08 William J Rogers Air cooling system for tents or canopies
US2673403A (en) * 1950-08-18 1954-03-30 Fagioli Emilio Device for drying materials by means of ventilation
DE969589C (en) * 1950-08-18 1958-06-19 Ercole Marelli & Co Societa Pe Chamber dryer
US2673074A (en) * 1952-08-04 1954-03-23 Joe W Dailey Cooling unit for refrigerator systems
US2898841A (en) * 1954-02-01 1959-08-11 Knutson Harold Air scupper
US3279209A (en) * 1964-04-15 1966-10-18 Laing Vortex Inc Cross flow machines and air conditioner units incorporating such machines
US3978919A (en) * 1974-03-20 1976-09-07 Hans List Cooler-cum-blower assembly for internal combustion engines
US4086886A (en) * 1974-07-25 1978-05-02 Motoren- Und Turbinen-Union Friedrichshafen Gmbh Cooling installation
US6588228B2 (en) * 2001-11-08 2003-07-08 Samsung Electronics Co., Ltd. Integrated air conditioner with a fan casing
US7813129B2 (en) * 2002-03-31 2010-10-12 J. Van Der Werff Holding B.V. Cooling of electrical and/or electronic components, specifically computer equipment
US20060120045A1 (en) * 2002-05-31 2006-06-08 Jan Van Der Werff Cooling of electrical and/or electronic components, specifically computer equipment
US20080257336A1 (en) * 2007-04-03 2008-10-23 Trane International, Inc. Furnace with Integrated Blower Housing and Heat Exchanger
US7677238B2 (en) 2007-04-03 2010-03-16 Trane International Inc. Furnace with integrated blower housing and heat exchanger
US7677237B2 (en) 2007-04-03 2010-03-16 Trane International Inc. Furnace with integrated blower housing and heat exchanger

Similar Documents

Publication Publication Date Title
US1884898A (en) Air circulating and temperature changing unit
US2468909A (en) Auxiliary air heater
US2879976A (en) Heat saver
US1877905A (en) Poration
US2229032A (en) Heating apparatus
US2054144A (en) Refrigerating apparatus
US2346410A (en) Unit heater
US2552470A (en) Air circulator and heater
US1976228A (en) Humidifier and the like
US2488548A (en) Forced-air house heating apparatus
US2793710A (en) Heat exchanger
US2503667A (en) Heat exchanger
US2903247A (en) Radiators of the baseboard type
US1884094A (en) Heat exchange apparatus
US3494415A (en) Room heating and cooling apparatus including a crossflow blower
US2258790A (en) Air tempering device
US1819608A (en) Heating apparatus
US3395752A (en) Baseboard heat exchanger apparatus
US1896081A (en) Condenser
US2626783A (en) Heat exchanger
US2136339A (en) Fluid compressor
US1403319A (en) Heat-exchange apparatus
US1709176A (en) Condenser for refrigerating machines
US1849396A (en) Air heater
US1714695A (en) Air-heating apparatus