US 3441082 A
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April 29, 1969 D A, FRAGNlTO ET AL 3,441,082
AIR CONDITIONING UNIT Filed April 25, 1967 FIG. 5
@v1/MVM AM 43 INVENTORS` DANIEL A. FRAGNITO.
RL C. HERB.
United States Patent O U.S. Cl. 165-123 2 Claims ABSTRACT F THE DISCLOSURE A room terminal for use in an air conditioning system. Air is provided to the units `from a central station, the discharge of air from the units being regulated by a sliding plate damper.
Background of the invention This invention relates to air conditioning systems employing a central station air conditioner to provide conditioned air for supply through connecting ductwork to a plurality of units located in the areas to be conditioned. The type of room unit employed with the central air conditioner is dependent on the building design, type of activities carried on in the building, the climate and many other conditions.
Thus a room unit relying solely on the air from the central station for heating, cooling, humidifying the area might be utilized.
Another type of room unit is one in which the air from the central station is blown through a reheat coil which is thermostatically controlled to temper the air and maintain the desired air temperature in the area irrespective of cooling or heating load variations. In this Way, the temperature in each area served by the central station may be varied to suit the occupants of the area.
Still another type of room vunit is one in which a thermostatically controlled heat exchanger, through which a heat transfer uid flows, is provided in the room unit, the air from the central station, referred to as primary air, being discharged in the unit in such a manner as to induce room air, referred to as secondary air, through the heat exchanger where it mixes with the primary air and is discharged back into the area being conditioned.
When any of the foregoing types of room units are installed, it is desirable to balance the system, that is, regulate the amount of air flow through each unit to match the requirements of the area being conditioned.
A damper is usually provided in each room unit for this purpose. One of the problems that is encountered with dampers in room units is the change of direction of the air stream leaving the damper as the damper adjustment is varied. For the room unit to operate at maximum eciency and minimum noise levels, the direction of air ow from the damper should not change with variations in damper adjustments.
Summary of the invention In accordance with a preferred embodiment of this invention, an air conditioning system is provided with room units employing a sliding plate damper for regulation of air ow therethrough. The damper, in accordance with this invention comprises two perforated parallel plates having one plate superposed on the other with substantially aligned offsets formed therein rso that the walls of the perforations forming air passages therebetween lie in the same plane.
Brief description of the drawings FIGURE 1 is a View, partly diagrammatic and partly in perspective, illustrating the air conditioning system of the present invention;
3,441,082 PatentedApr. 29, 1969 FIGURE 2 is a sectional view of a room unit employed with the system shown in FIGURE l;
FIGURE 3 is a fragmentary sectional view of the sliding plate damper for use in a room unit illustrating the prior art;
FIGURE 4 is a fragmentary sectional view of the slidin g plate damper of our invention taken along lines IV-IV of FIGURE 2; and
FIGURE 5 is a fragmentary plan view of the damper illustrated in FIGURE 4.
Description of the preferred embodiment The air conditioning system illustrated in FIGURE l comprises suitable air conditioning apparatus placed in a central location 2, such apparatus being contained in a casing 3. The apparatus may be disposed in any suitable place in the basement, on the roof or in a storage space of a building served thereby. A fan 4 is provided to draw air through the casing 3, the air being conditioned in any desired manner during its passage through casing 3, and then to discharge the conditioned air at relatively high static pressure and high velocity into an air conduit such as riser 5.
The air conditioning apparatus illustrated at 2 may be of any desired type and it is understood that the present invention is not limited with respect to the apparatus illustrated. As illustrated, apparatus 2 includes a plurality of dampers `6 through which air is drawn into casing 3 from the exterior of the building, a filter 7, a preheating coil 8 through which heat exchange medium such as steam may be passed to preheat the air drawn into easing 3, sprays 9, a dehumidication or cooling coil 10 and a reheating coil 11. In such apparatus, air is suitably conditioned in accordance with the requirements of the areas to be conditioned.
Conditioned air is forced through riser 5 by fan 4 and through a run-out 12 to room conditioning units 13 placed in one or more bays of the building structure being conditioned. It will be appreciated partitions may separate the bay into a plurality of individual areas to be conditioned or the entire bay may be treated as a single area to be conditioned.
Heat exchange medium such as hot water is supplied to the heat exchange members 15 of the room units 13. A pump 17 is provided for pumping water from heater 19 through line 21 to the unit heat exchange members and back to heater 19 through line 23.
The room unit 13 includes a casing 25 having a sliding plate damper 27, heat exchanger 15 and discharge grille 29 disposed therein. The sliding plate damper in conjunction with the bottom portion of casing 25 forms a plenum 31 which is supplied with conditioned air from air conditioning apparatus 2 through run-out 12. Thus air is discharged from plenum 31 through damper 27, heat exchanger 15 and discharge grille 29 into the area to be conditioned. The sliding plate damper 27 is of novel construction, as illustrated in FIGURES 4 and 5. It is to be understood that an operating mechanism, not shown, is provided for sliding the plates relative to each other. In ordinary sliding plate dampers, as illustrated in FIGURE 3, when the damper is wide open, air is discharged normal to the plane of the plates. However, as the damper is adjusted to restrict flow therethrough, the air stream is deflected, as illustrated by the arrows in FIGURE 3. Heretofore, the use of a sliding plate damper has resulted in less than optimum unit efliciency and high noise levels as the direction of air flow therethrough varied with the damper adjustment.
The sliding plate damper of our invention comprises bottom plate 40 having a plurality of openings 42 therethrough having opposed end walls 43 and 44. A top plate 48 in mating engagement with bottom plate 40 has a plurality of openings 49 therethrough having opposed end walls 50 and S1, one edge of each opening in plate 48 having an offset portion 54 formed therein, each portion 54 being offset one plate thickness so as to be in substantially the same horizontal plane of plate 40. The walls 50 on offset portions 54 are thereby in alignment with mating walls 44 on plate 40.
By utilizing the damper of our invention, the direction f air flow through the unit is not changed by adjustment of the damper, allowing a unit construction having lower noise levels and greater efficiency.
The damper of our invention has been described in relation to a room unit utilizing a reheat coil. It is Within the scope of the invention to utilize a damper with a wide variety of room units, such as an all air unit, an induction type unit, wherein the air provided from the central station (primary air) would be discharged in the unit in a manner to induce room air (secondary air) through the unit over a heat exchanger and then back into the room.
Further, while we have described a sliding plate damper having offset portions on one plate lying in the plane of the second plate, it is to be understood that each plate could have offset portions extending one-half a plate thickness into the mating plate, thus providing aligned edges in a plane between the two plates.
1. A room terminal for use with an air conditioning system comprising a housing,
a plenum disposed in said housing for receiving conditioned air,
a discharge grille disposed in said housing for passing conditioned air from the room terminal into the area being conditioned,
a first, relatively tlat plate, disposed in said housing between said plenum and said discharge grille having at least one opening disposed therein, said opening being formed by removing material from the plate to form an opening having opposed side Walls and opposed end walls,
a second relatively flat plate having at least one opening disposed therein, said opening being formed by removing material from the plate to form an opening having opposed side walls and opposed end walls, said second plate overlying said first plate and being arranged so that the lower surface of said second plate slidably engages the upper surface of said first plate,
at least one of said plates having a portion adjacent to and including one wall deformed from the plane of the plate so the deformed wall resides substantially planar with and opposite said wall in the other plate to form an opening therebetween for restricting the air flow therethrough by relative movement of said plates.
2. A room terminal according to claim 1 further including a heat exchange coil disposed in the room terminal in heat exchange relation with the air flowing through the terminal.
References Cited UNITED STATES PATENTS 2,463,322 3/1949 Sewell et al. 165-l23 X 3,211,218 10/1965 Mehr et al. 165-123 FOREIGN PATENTS 350,788 l/ 1961 Switzerland.
MEYER PERLIN, Prima/y Examiner.
THEOPHIL W. STREULE, Assistant Examiner.
U.S. Cl. X.R. 98-40