US1990356A - Heater - Google Patents

Description

Patented Feb. 5,

UNITia:D@srares ymirarvr orFlcla:

My invention relatesto a heater for buildings wherein outside airis ,ventilated into the buildingy and is heated or air conditionedbefore entering the rooms. p f

Oneofzthe objects of my i ventionistheelimivnation of drafts resulting from. ventilating into orifices at the inlet should be of such diameter the room air that is too cold. .i

Another object of my invention is the, elimination of overheating resulting ,fromventilatingf larger orices will be substantially filled with 4 steam before steam enters the other tubes in any substantial amount.

into the room air that is too warm... f

Another of the' objects of my invention is,` the distribution of the heat evenly across the heater.

The variousfeatures of novelty whichcharacterize my invention-are pointed out'in claims annexed to and forming a part of this specification. In the accompanying'l v4drawing. which illustrates myr invention; Figurer 1 is la perspective 1 view of the air. conditioning unit, witha portion broken away to show theoutlets into the( oppovsiteheader of the'heater. i

v motor 15 and discharging "airrup'wardthroughv the fan outlet 16. Y1"!represents:the*heater-which of the enclosure broken away to showthe heater and valve,k and' with a. portion Vof A.the heater Figure 2 shows the kvalve in elevation, partly in section, with a portion of. the'vvalve lbody broken faway. l

Figure 3 is a side ment. f

Figure 4 is a transverse section of the header takenon the line A--A' of Figure -3. v

. Figure 5 is atransverse 'section of the return header taken on theline B-B of Figure 3;

elevation of the heating elet Referring to Figure 1"of the specification, 10 f represents the 'housing ofthe unit'with an outlet 12, a recirculated air inlet 11, and an outside inlet 13. Mrepresents thefbloweroperated'ibythe is shown more inv detail Figures3,4and 5.

In Figure 3,:.18 is the inlet header, 19 theoutv` let header, said headersbeingconnected by heat tubes 20, onwhichlaremounted fins 21. The I'fins comprise thin metallicsheetswith apertures' 22 `therein.t .Thelfins are mounted onthecheat tubes f by passingfrthem lthroughlth'e a'pertures'22and engaging*v thefins in a heat conductingr relationship in theonven'tional way so that the n over its entire surface may receive heat from any tube. The fins extend across the heater as shown in Figure 1. In the heater a plurality. of heat tubes 20 are rolled into the side walls'23 and-24 of the headers 18 and 19 respectively,v and form connecting mediums between said headers. In the header 18 the tubes 20, with the exception of tube 25, have an orificed bushing 26, While in the header 19 the ends of the tubes 20 are open and only the vtube 25 hasthe oriced bushing. vIt is understoodthat the term open Yis relative and that a ring could be inserted in the opening of the tubes which would not impede the passage ofi steam, or one orifice may be larger than the f other orifices, the limitation being thatthe larger in comparison to the diameters of thelother In the inlet header y18,Y the effect of the orificed bushing isto restrict the flow of steam intov the tubes 20 with the exception of tube 25, which having no oriflced bushing tends to fill with steam before the tubes 20. `The effect of the oriced bushing in tube 25 in theoutlet header 19 is to restrict the outward flow of steam from tube 25, before it has been condensed, and the orifices in' the bushings 26 being of equal diameter tend to equally balance and distribute the pressurei It is manifest that only in the coldest weather is the full capacity of the heater required but that in mild weather, especially above 40 F., it is 'important to distribute some steam the entire length of the heater;` otherwise the end of the heater near the inlet header would be Very warm but that portion of the heater near the outlet header would be cold, resulting in failure to heat the incoming air, with. resultant cold air drafts.

'It `is manifest that in the present disclosure that a vsmall amount ofsteam lwill heat they tube 25 lthe entire length. Due tothe construction wherein each iin 21 is mounted on each'tube, itis alsov apparent that steam in any tube will tend to heat all of the finsV mounted thereon. Thus steam in the tube 25 will impart some heat to the entire surface of all of the fins of the heater; The tube 25 is selected to carry the inltialsteam supply because it passes through each fin at approximately a middle point, thereby distributing its heat equally on Aboth sides of `the A,heater of the kind described is of importance Tf in,V aunitventilator where it is designed tohavev the steam supply to the heater responsive to the outlet temperature of the heater.

In this conynection it' is desirable to have the outlet temper ated by two bulbs 29 and 30 respectively. The bulb 29 is responsive to the temperature of the air emitting from the heater 17, while the bulb 30 is responsive tothe temperature of the air entering the recirculating air inlet 1l, or itmay be placed outside of the housing entirely and besub'ject entirely to the temperature ofthe room air.

I Within each bulb is a volatile fluid and the spacewithin each bulb is in communication ,with the space within the bellows 41 by' means of the capillaries or conduits, 31 and 32 respectively, which unite at 33, thence by the capillary 34 entering the valve body through the aperture 35. The operating portion of the valve, with" the exception of the two bulbs andcapillariesgiis similar in construction to the temperature control valve set forth in U. S' Patent "No. 1,847,911

dated March 1, 1932, issued to me. f On aivalve body 38 are mounted bonnets 36 and 37. With- 'in---the `'valve body 38 is-the-port 39; the-throttle '141 actuated by thelthermosta'tic b =.-llo\`7v`s"40,V4 which `-'intu1'n :is actuated by y'the -`pressure of i the satuf" rated'vapor therein, due tothe temperature of the 25' volatile liquid in the bulbs 29i'and-- :3l-respectively.

The bellows 42foperates tobalance' thetherrno- 1fstaticf Ybel-lows v 40, l and: withinthe 'bellows'ff42' :is a; spiral spring 43 acting in opposition to the force-of the saturated vapor-inthe thermostatic 3() Jiagainst `the springf43 for the -purpose'of adjustbellowsf'40.A 44 is` an adjustingscrewbearing ing the force of the spring 43. The pressuresof I the'saturatedgas withinthe bellows-41 being fr determined at the" temperature of air: surrounding the bulb and at which it is desiredthat ithe .valvei'open or close, the springis adjustedto equal that pressure. Any decreasein'the presf sure of `thesaturatedvgaswillcause the valveto open due to the force ofthe spring 43. The vapor 1 the liquids'inv the bulbs 29 and 30.

Lpressure Within the bellows 40 r isir'esponsive to The 'temperature of the air surrounding yeach @bulb will'have aninfluence vuponv the pressure vof the saturatedvaponand a change inthe temperature of the air surrounding each bulb,V Will .tend/'to either raise orlower the pressure of the #saturated vapor in the bellows -and Vactuate thevalve.

f r-In theinvention disclosed,`the applicant pre- .fers Vto place one bulbr 29 in the air vfrom Vthe beaten. preferably nearV the outlet. header-where there is aminimumamount `of heat transfer to :ithefincoming air,`and one bulbzin :thefroom air .ffor'in'therecirculating air inlet.. v-If` the valve -is v`adjusted to close at 67and to openwhen "fthe i -ternperature fallsto lower than 67, thenwhenh everthe `outlet Vairr from vthe heater is less .than

Ajustingythe forces Within-the valve, sfiicie'nt k -by only a fewrdegrees change intemperature lto open the valve sumciently. Itis manifest'that under this arrangement no air will be ventilated into the room at substantiallyless "th'an'ff67,

'The other bulb 30 is located inthe roornair or th liquid 29"" W0ll1d transfer tothey'blllb 30 and 10 Awould be inoperative untilthe temperature of the airrsurrounding the bulb 29 was reduced to subystantially the temperature of the air surrounding ,bulbv 30, where condensation would take place within the bulb 29 and it4 wouldagain become. 15

operative.

. It ismanifest with the heater designedas del n scribed 'and"'the'^valv'e constructed as described that the ventilating unit will regulate the minimum temperature ofthe incoming ventilated air 20 andwill regulate the minimum room' temperature. With reference -f to "the-maximum temperature Vof. the room,fwhen"fboth the inlet' air temperature and the room temperature exceed 67,thefvalve willcloseand vprevent over-heatingzdue: to-s'team;V 25

The. temperature setting of. 67 is k:merely given las a convenient example, uit beingl understood y that the operator vwill fsetgthe valve atthe'temp'erature l `which 'will produce the desired `air vconditions and temperatures.` l f i While Iy have described in v=bodiment of: my invention, :itZ isA understood. that II y-arn not limited to Ithe detailsstherein. set .fort

except as defined bythe following c1aimsf ",Ifglaim;;i f "l H' f nationfof inlet andoutIet-Qheaders with spaces therein, heat tubes withrextendedheating surface connecting'said* spaces, some. ofthe said tubes ameter at their outlets than the remainder ofsaidIk stubes., w l

2. In a heater for air conditioning, the combination .of inlet kand outletheaders withyspaces therein, heat. tubes with extended `surfaceffcon- 1. Ina heater forfairfconditioning the combi- .necting said spaces, some of saidheattubeszbeing* providedfwith restrictivefopenings of iixeddiameter at their inlets and the remainder of said tubes i; being provided"v withre'strictive openings at their .Outlets.y

xan'atio ofrninlet and foutletheaders: with spaces l therein;- theat. tubes with'. extended' surface vconnectingsaid spaces, atleast .oneof said heat tubes being fprovidedat'its, inlet,` with a' restrictive open- 3.1:In: a heater, fortair. conditioning, .the combi-ly xing of:fixed..diametergatheremainder of saidtubes 6o cwbeing .f provided with smaller. openings of `:fixed `diameterfsaidextended surface ,comprising metal .1 'stripslf-smounted: upon all,.of.1 saidziheat tubesand 1 extending substantially-across said, heater..`

, RunEN l

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