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July 16, 1935. L. u. LARKIN 2,008,255 COUNTER FLOW AIR CONDITIONER Filed Nov. 1e, 193s 2 sheets-sheet 1 MTPDVAMnC.j-Hwqßl,Ãdw/à@ f \\ [email protected] [email protected]@_mmSs HmH4„[email protected]@iIT, Vw„HH#UHHw_uw'1. w @Mfma'gésfmwm drm , „c LA July 16, 1935. - 2,008,255 L, u. L_ARKIN COUNTER FLOW AIR CONDITIONER Filed Nov. 16, 1935 2 Sheets-Sheet 2 .om w mi LESTER LAreK/N 5f www? ' Patented July 16, 1935 2,008,255 UNITED STATES PATENT oFFlcE 12,008,255 COUNTER FLOW CONDITIONER Lester U. Larkin, Atlanta, Ga., assignor to Larkin Refrigerating Corporation, Atlanta, Ga., a cor poration of Georgia Application November 16, 1933, Serial No. 698,291 2 Claims'. (Cl. 257-244) ' This invention relates generally to Ventilating 1, showing a modified form of the invention; and air cooling systems; and, more particularly tov Figure 4 is a vertical section taken on the line cooling systems adapted for use in the form of 4_4 of Figure 3. small compact highly efñcient units for cooling In Figures 1 and 2 of the drawings, the unit air in refrigerated display counters or cases, is shown as comprising a base plate I, extended market refrigerators, cold storage rooms, and rearwardly to form a support 2 for a motor 3 the rooms of residences, oñîice buildings, etc. having its rotor shaft 4 extending in opposite In residence and office cooling it is ordinarily desirable to decrease the humidity of the air as 1 O it passes through the conditioner; since, a de crease in humidity results in a greater rate of evaporation of perspiration in the persons sub jected to the conditioned air. In this case, the cooling unit is comparatively small, and the tem 5 directions from the motor casing. On each side of the motor there are arranged the blower cas ings 5 and 6 constructed to communicate at their upper ends with the conduit -I forming part of an air cooling casing designated generally by the numeral 8. The casing 8 comprises the base plate I, side perature ‘ difference is likewise comparatively walls 9 and I0, a top II and partitions I2 and l5 small, since comfortable living conditions never I3 extending across the casing parallel to the require the air to be lowered anywhere near the base plate I and dividing the casing into three freezing point. In other Words, a small cooling conduits 1, I4 and I5. The conduits 'I, I4 and unit circulating hot humid air will decrease the 2O humidity thereof. I5 are substantially equal in size, and are di mensioned so that each conduit can accommo On the other hand, a comparatively large unit date at least two grids of a cooling coil formed vE20 used for refrigeration purposes in a cooler or of piping having an outlet I 6 at the Warm air cold storage room may cause an increase in rela inlet of the conduit l. The top II is connected tive humidity, since the conditioned air is usually brought down to temperatures around the freez-A ing point. This refrigeration, obviously, causes shrinkage of the air originally in the cooler, and to the partition I3, at the exit end of the casing 8, by a semi-cylindrical casing Il; and the base 25 plate I is likewise connected by a semi-cylindrical plate I8 to the motor end of the partition I2. with a consequent suction of outside air, and its By this arrangement, the conduits l, I4 and I5 moisture content, into the cooler to compensate form a continuous counter?low duct for conduct for this shrinkage. This results in an increase in ing air from the air inlet I9 of the unit to the air 30 relative humidity of the air in the cooler. This outlet- 20 thereof. means that decrease or increase in humidity of As will be apparent from the drawings, the a compartment or room will depend upon the piping forming the upper grid in the conduit size of the cooling unit as compared with the 'I extends from the refrigerant outlet or suction 35 size of said compartment or room, and with the connection I6 to the exit end of the casing 8. 35 drop in temperature which the unit is designed to At this exit end, a bend 2I connects the upper effect. grid 22 to the lower grid-23 in the conduit l. The main object of the invention, therefore, is The lower grid 23 at the inlet end of the casing to provide an air conditioning unit which is 8 is connected by a bend 24, which extends 40 highly efficient in operation, and in which the through the partition I2, to the upper grid 25 relative humidity of the air conditioned may be ' in the condnit I4. At the exit end of the cas considerably increased by the cooling operation ing 8, which is also the inlet end of the conduit of the unit, or may be decreased where this is I4, the upper grid 25 is connected by a bend found necessary or desirable. 25 to the lower grid 2'I in the aforesaid conduit I4. Other objects of the invention will become ap At the inlet end of the casing 8, the grid 21 is 45 parent as the detailed description thereof pro connected by a bend 28, passing through the par ceeds. tition I 3, with the grid 29 in the upper part of the In the drawings: . conduit I5. The grid 29, at the exit end of the Figure 1 is a top plan view of an air condition casing 8 and of the conduit I5, is connected by a 3 50 ing unit embodying the present invention, part bend 30 to the lowermost grid 3I, which, at the 50 of the casing being removed to illustrate details inlet end of the casing 8, is connected to the inlet end 32 of the entire coil system contained with of construction; Figure 2 is a vertical section taken on the line in the several conduits 1, I4 and I5. It will be noted from the foregoing disclosure 2_2 of Figure 1; A Figure 3 is a top plan View, similar to Figure thatv the Warm air forced into the conduit 'I by 55 65 2 2,008,255 the blowers contacts with the warmest part of _the cooling coils. 'I‘his construction and mode -of operation enables the refrigerant to absorb the greatest number of heat units possible for lt to same reference characters. In this form of the invention, however, the refrigerant inlet 32' of the coil piping 35 terminates at the cold air out let 20' of the unit. The coil construction in this contain at temperatures prevailing at the exit form ofthe invention will be obvious from in or suction end thereof. In this respect, the pres spection of the drawings. ent cooling unit operates directly opposite to the It is intended that either of the units disclosed Acooling devices of the prior art.V In other words, the warm air contacts the warmest part of the 10 coil; and the cold or conditioned air emerges from the coldest end of the unit. This arrangement and mode of operation have the effect -of reducing or practically eliminating in this application may be used in any convenient position. For example, either unit may be in stalled with its conduits perpendicular in one end of a refrigerated counter. The unit may be ar pinging thereon, the less will be the condensation. This effect continues throughout the entire length of the conduits from inlet to exit. In other words, the decrease in temperature of the air being con ducted through the air ducts of the unit is ef fected gradually and not in sharp steps as would ing from the outlet of the unit along the top 5 ranged with a motor at- the bottom of the counter „ so as to expel cold air out o-f the top of the unit condensation. It is obvious that the nearer the toward the center of the refrigerator in which temperature of the coil to that of the air im case it may be convenient to use a duct extend 15 be the case if the warm air were forced initially against the coldest part of the coil system to emerge at the warm end thereof. 25 v ' The grids of each compartment are traversed by aseries of fins 33, preferably of aluminum, and extending perpendicularly to the convolu tions of the grids in each compartment. These ‘ñns are preferably constructed and arranged on 30 the grids substantially as disclosed in the United of the counter case. The unit may also be dis posed with the motor and fans below the tori of the counter to expel the cold air toward the center ofthe case and along the bottom thereof. 20 In other words, the operation of the invention disclosed herein is not in any way dependent upon its being arranged in any particular posi tion in any refrigerator or compartment. While not shown nor described in this appli 25 cation, it is to be understood that the unit will be provided with the usual adjustable thermo static controls to regulate the operation of the refrigerant coils and the temperature of the air conditioned by the unit. These thermQstatic 30 States patent to Larkin, No, 1,776,235, September switches and valves controlled thereby are very 16, 1930; and each extends substantially the en tire length of the conduit ln which it is ar ranged. well known in this art; and form no essential part of the present invention. It is thought that the invention and numerous` As disclosed in the aforesaid Larkin patent, of its attendant advantages will be understood 35 the coils provided with these vertical flns are from the foregoing description, and it is obvious highly eñicient and reduce the temperatures of that numerous changes may be made in the form, air passing therethrough with great rapidity. construction and arrangement of the several Moreover, the temperature differential between parts Without departing from the spirit or scope the coils and the air conditioned thereby is so of my invention, or sacrificing any of its at 40 smallthat to bring the air down to any desired tendant advantages, the form herein described temperature, it is only necessary to maintain the being a preferred embodiment for therpurpose refrigerant inlet end of the coil at about one de-. of illustrating my invention. gree below that of the air as it emerges from What I claim is: the exit end of the unit. ' 1. An air conditioner comprising: a casing hav 45 It must be distinctly understood >that this in ing a series of superposed conduits extending vention is not to be considered as in anyway lengthwise therethrough, means for connecting limited to the number of air conduits arranged the adjacent ends of said conduits in series to vin the casing, or to the number of grids of cool provide a continuous circuitous air duct through 50 ing coils which may be arranged in-each conduit. all of said conduits, meansífo'r forcing air through 50 It must also be understood- that the invention is said duct, means extending transversely of each not to be considered as vlimited to-the use of any conduit for cooling the air during its passage ‘ particular number of cooling grids in each con through said air duct, and cooling ñns extending 35 , duit. It is desirable, of course, that the coldest lengthwise of , each conduit in said air duct and end of the coils shall be at the exit end of the connected tosaid air cooling means. casing. This result could obviously be obtained 2. An air conditioner comprising: a casing hav 55 by using three grids zigzagged in the conduit I5. ing a- series of superposed conduits extending However, the ñnal result is not substantially af fected by using thetwo grids as shown in con lengthwise therethrough, means for connecting the adjacent endsl of said conduits in series to provide a'continuous circuitous air duct through inlet end of the coil system to be positioned at 60 duit I5, and which, therefore, require the cold the warm air end of the unit. In the ideal sy‘s all of said conduits”, a refrigerating coil grid tem, however, the cold inlet of the cooling coils ì mounted in said‘casing and having grid branches ' extending substantially across each of said con- ` should be located at the cooled air exit. In the modification shown in Figures 3 and 4, duits, and cooling fins extending lengthwise of the blower mechanism and casing are substan each conduit and Vin heat conducting contact n tially the same as the blower mechanism, and across said branches. y casing shown in Figures land 2; and the corre sponding parts thereof are designated by the » LESTER U. LARKIN. '