DESC:TECHNICAL FIELD OF INVENTION
The present invention relates to an air conditioning system. More, particularly the present invention relates to an outdoor unit of a split type air conditioning system.

BACKGROUND OF THE INVENTION
A split air conditioning system comprises an indoor and an outdoor unit. The indoor unit is installed in a room or an enclosure, whereas an outdoor unit is installed on an outside wall of a building. Accompanying Fig. 1(a) shows an exploded perspective view of an available outdoor unit (1) of a split air conditioning system. Referring to Fig. 1(a), the available outdoor unit (1) comprises a fan (2) for axially intaking air so that the air flows over the condenser coils (3). A fin area of the condenser coils (3) is unequally in contact with the air blown by propellers of the fan (2). Therefore, a variable velocity of air flows out of the condenser unit (1). Effectively a low volume of air, which is calculated in cubic foot per minute (CFM), flowing over the condenser coils (3) results in lesser amount of heat being rejected from the condenser coil (3). Therefore, efficiency of the condenser coils (3) is lower in the available outdoor units (1).
As seen in Fig. 1(a), the available outdoor units (1) comprises a compressor section which houses the compressor (4). An electrical box, which includes an electrical controller (5) is fixed in the compressor section. In the available outdoor units (1), the electrical controller (5) and the compressor (4) share the same working space. The compressor (4) comprises a network of pipes (not shown) that are connected through pipe joints and connection valves. The pipes carry pressurized hazardous refrigerant. A possibility of minor leakage of the refrigerant through these pipe joints cannot be disregarded. Therefore, an unwanted sparking incident in the electric box may lead to a serious fire accident, when the sparks come in contact with the leaked refrigerant from the compressor (4).
The accompanying Figs. 1(b) and 1(c) show an available outdoor unit (1) of Fig. 1(a), respectively in top and side views. As seen therein, a minimum distance which is required to be maintained between a wall and the outdoor unit (1) is between 100 and 200 mm approx. This distance is very essential as it ensures constant air flow over the condenser coils (3) during operation. Hence, a special arrangement such as a pedestal or a loft is required to be designed and pre–installed, before installing the outdoor unit (1) over the pedestal or the loft. Many times, the persons who install the outdoor unit at a site location are not technically qualified or skilled to understand the technical requirements behind maintaining the minimum distance between the outdoor unit and the wall. Also, paucity of space at certain site locations may cause inconvenience in installing the available outdoor unit (1) thereat. This may lead to a faulty installation, thereby leading to overheating of the condenser coils due to lack of adequate air flow over the condenser coils (3).
The accompanying Fig. 1(d) shows another perspective view of an available outdoor unit (1). The condenser coils (3) are directly exposed to atmosphere, as seen therein. Hence, the condenser coils (3) come in direct contact with dust. During operation, when the fan (2) is running, dust flows over the directly exposed condenser coils (3) due to inward air flow. Therefore, a large amount of dust gets accumulated over the condenser coils (3) to form a sticky and a thick layer of dust over the condenser coils (3). The accumulated dust on the directly exposed condenser coils (3) blocks inward air flow, which result in lower efficiency of the entire air conditioning system. Also, the condenser coils (3) have to be cleaned regularly, which leads to more incidences or frequency of undesired serviceability.
Hence, there is a need for a solution wherein at least one of the problems observed in the outdoor unit of air conditioning system of the prior art, can be overcome.

BRIEF SUMMARY OF THE INVENTION
In order to overcome the above-mentioned problem, the present invention provides an outdoor unit of an air conditioning system, the outdoor unit comprising: a partition panel separating a fan section and a compressor section, said partition panel holds a fan motor, as per an embodiment of the present invention. A polygonal heat exchanger having a polygonal coil face area encompassing a plurality of fan propellers mounted on the fan motor is provided as per an embodiment of the present invention. An enclosure covering the polygonal heat exchanger, said enclosure has a grille for discharge of hot air is provided as per another embodiment of the present invention. An inlet between the partition panel and the enclosure acting as an air inlet through which air is sucked and passed through the polygonal heat exchanger, is provided as per another embodiment of the present invention.
As per an embodiment of the present invention, the enclosure has a shroud adapting circumferentially on an inner wall of the enclosure, the polygonal heat exchanger extends in a space formed between the enclosure and shroud.
As per another embodiment of the present invention, the shroud has a suspended edge defining a space between the suspended edge and edges of propellers of a fan that acts as a venturi.
As per yet another embodiment of the present invention, the unit has an electric section separated from a compressor section.
As per an embodiment of the present invention, the polygonal heat exchanger includes shapes such as circular, triangle, square, pentagonal, hexagonal, octagonal, and the like.
As per still another embodiment of the present invention, the heat exchanger is held on a holding member of a base.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Fig 1(a). shows an exploded perspective view of an available outdoor unit of an air conditioning system.
Figs. 1(b) and 1(c) shows, respectively in a top view and a side view, a minimum distance, which is required to be maintained from a wall, and the effective installation area required during mounting of the available outdoor unit of an air conditioning system shown in Fig. 1(a).
Fig. 1(d) shows another perspective view of an available outdoor unit in which the condenser coil area is exposed to atmosphere.
Fig. 2(a) shows a perspective view of an outdoor unit, as per an embodiment of the present invention.
Fig. 2(b) shows an open front view of an outdoor unit with a polygonal heat exchanger having a plurality of fan propellers, as per an embodiment of the present invention.
Fig 3. shows a perspective view of an outdoor unit from its backside, as per an embodiment of the present invention.
Fig 4. shows an exploded perspective view of an outdoor unit, as per an embodiment of the present invention.
Fig. 5 shows a perspective view (quarter cross section) of the interiors of an outdoor unit, as per an embodiment of the present invention.
Fig 6. shows a perspective view of an outdoor unit from its backside, especially an arrangement for installation of the outdoor unit in a magnified view, as per an embodiment of the present invention.
Figs. 7(a) and 7(b) shows, respectively in a side view and a top view, an installation area which is required during mounting of the outdoor unit of an air conditioning system, as per an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION:
While this invention is susceptible of embodiments in many different forms, there is shown in the drawings and will herein be described in detail, a preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspects of the invention to the embodiment illustrated.
The subject matter is now described regarding the drawings, wherein like reference numerals are used to refer to like features/ elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It may be evident, however, that such matter can be practiced without these specific details. In other instances, well–known structures are shown in diagram form to facilitate describing the invention.
Referring to the accompanying figures, as per an embodiment of the present invention, an outdoor unit (100) of an air conditioning system, the outdoor unit (100) comprises: a partition panel (130) separating a fan section and a compressor section, said partition panel holds a fan motor (M). A circular heat exchanger (110) having a circular coil face area encompassing a fan propeller (140) mounted on the fan motor (M); an enclosure (120) covering the heat exchanger (110), said enclosure has a grille (G) for discharge of hot air; and an inlet between the partition panel (130) and the enclosure (120) acts as an air inlet through which air is sucked and passed through the heat exchanger (110). The enclosure (130) has a shroud (160) adapted circumferentially on an inner wall of the enclosure (130), the polygonal heat exchanger extends in a space formed between the enclosure and shroud (160), as per an embodiment of the present invention. The shroud (160) has a suspended edge (SE) that defines a space (S) between the suspended edge (SE) and edges of propellers (P) of the fan assembly (140) that acts as a venturi, as per another embodiment of the present invention. The outdoor unit (100) has an electric section (E) that is separated from a compressor section (C), as per yet another embodiment of the present invention. The heat exchanger may include any polygonal shape such as circular, triangle, square, pentagonal, hexagonal, octagonal, and the like, as per an embodiment of the present invention. The heat exchanger (110) is held on a holding member (H) of a base (B), as per an embodiment of the present invention.
As seen in Figs. 2(a) and 2(b), the outdoor unit (100) of an air conditioning system as per an embodiment of the present invention comprises a circular condenser heat exchanger (110), an outer enclosure (120), a fan section (F) which is demarked by a partition panel (130) and a fan (140) with fan propellers (P). The heat exchanger (110) is held on a holding member (H) of a base (B), as per an embodiment of the present invention. As per a preferred embodiment of the present invention, the outer enclosure (120) is in the form of a circular grille (G). In a preferred embodiment of the present invention, the polygonal condenser heat exchanger coils (110) are formed in a circular shape. Diameter of the condenser heat exchanger (110) is lesser than the diameter of the outer enclosure (120). Therefore, the condenser heat exchanger (110) is able to snugly accommodate inside the outer enclosure (120). The outer enclosure (120) is then affixed with the condenser heat exchanger (110) with known temporary and/ or permanent means, such as screwing, riveting, snap fitting, nut and bolt assembly, welding, etc. A fan section (F) to accommodate the fan (140) is defined under the condenser heat exchanger coils (110). The fan section (F) is demarked by a metal bracket or a partition panel (130). The partition panel (130) holds a fan motor (M). As seen in Fig. 2(b), a distance (D) between the outer edge of the fan propeller (P) and the under surface (US) of the condenser heat exchanger (110) is maintained uniformally equidistant, as per an embodiment of the present invention. Therefore, during operation of the fan (140), the cubic feet per minute (CFM) volume of air that flows over the condenser heat exchanger coils (110) is greater than compared with the available outdoor unit from the prior art.
Referring to Figs. 3 and 4, the partition plate/panel or metal bracket (130) can be seen from its back side. An electrical section (E) containing the electric and/ or electronic implements such as circuitry, wiring, etc. is mounted on the back side of the partition panel (130). A separate compressor section (C) is mounted under the electrical section (E), in a preferred embodiment of the present invention. Therefore, the fan section (F), the electrical section (E) and the compressor section (C) are separated from each other, in a preferred embodiment of the present invention. Hence, any sparking incident in the electrical section (E) does not reach the compressor section (C), thereby providing safety and security from fire hazards. Further, the compressor section (C) is provided with side service plates so that the compressor installed inside the compressor section (C) can be easily accessed. Furthermore, the network of pipes (not shown) that are connected through pipe joints and connection valves are routed towards backside of the outdoor unit (100) to accommodate inside the compressor section (C). As per an embodiment of the present invention, the network of pipes that are connected through pipe joints and connection valves are not be seen from front of the outdoor unit (100).
In a preferred embodiment of the present invention, a plurality of air pockets or inlet(s) (150) are defined between the partition plate/panel (130) and an edge of the outer enclosure (120), when the outer enclosure (120) is assembled on the heat exchanger coils (110). During operation, when the fan (140) is rotating, air from the atmosphere is sucked in the fan section (F) (marked by arrows in Fig. 3), through the plurality of the air pockets or inlet(s) (150). While the atmospheric air is sucked by the fan (140), the air moves over the heat exchanger coils (110) while entering the fan section (F). Therefore, the atmospheric air absorbs the heat in the heat exchanger coils (110), in a preferred embodiment of the present invention. Thereafter, hot air in the fan section (F) is ejected through the grille (G) of the outer enclosure (110), in an embodiment of the present invention.
Referring to Fig. 5, an outdoor unit (100) as per an embodiment of the present invention is seen. A portion of the outer enclosure (120) of the outdoor unit (100) has been opened up in a quarter cross section so that the interiors, especially the fan section (F), can be seen in assembly in the Fig. 7. A panel or a shroud (160) is implemented in the fan section (F). As per a preferred embodiment of the present invention, the panel or the shroud (160) is in the form of a circular ring. The panel or the shroud (160) is adapted on the inner side (not shown) of the outer enclosure (120), as per an embodiment of the present invention. A small space (S) is maintained between the outer edge of the fan propeller (P) and a suspended edge (SE) of the shroud (160), as per an embodiment of the present invention. Therefore, the airflow delivered by the fan (140) during operation, experiences venturi effect as the hot air passes through the space (S) towards the grille (G) and further ouside. Hence, the space (S) ensures an improved airflow at a predetermined rpm of the fan (140). In a preferred embodiment of the present invention, the grille (G) is integrated with the outer enclosure (120) by known methods such as extrusion moulding or any other forming processes. The panel (160) is formed on inner surface of the outer enclosure (120), as per another embodiment of the present invention. The shroud (160) covers the inner circumference of the condenser heat exchanger coils (110) as per an embodiment of the present invention. Therefore, during operation, when the fan (140) is rotating at a particular rpm, the air is sucked in the fan section (F). Thereafter, the air moves over the condenser heat exchanger coils (110) to absorb the heat in the coils (110). The hot air then passes through the space (S) and is ejected out of the grille (G), as per an embodiment of the present invention.
Referring to Figs. 6, provisions are made in the form of a plurality of slots (170) for hanging the outdoor unit (100) on a wall. The slots (170) are inserted over hooks or hanging means which are affixed to the wall, in a preferred embodiment of the present invention. Referring to Figs. 7(a) and 7(b), the effective installation area required during mounting of the outdoor unit (100), as per an embodiment of the present invention, is less compared to that in the available outdoor units (1) seen in Figs. 1(b) and 1(c). Further, the problem of wrong installation by the person handling the installation of the outdoor unit as per an embodiment of the present invention is also addressed.

,CLAIMS:
1. An outdoor unit (100) of an air conditioning system, the outdoor unit (100) comprising:
a partition panel (130) separating a fan section (F) and a compressor section (C), said partition panel (130) holds a fan motor (M);
a polygonal heat exchanger (110) having a polygonal coil face area encompassing a plurality of fan propellers (P) mounted on the fan motor (M), the plurality of fan propellers (P) are equidistant from the polygonal heat exchanger (110);
an enclosure (120) covering the polygonal heat exchanger (110), said enclosure (120) has a grille (G) for discharge of hot air; and
an inlet (150) between the partition panel (130) and the enclosure (120) acting as an air inlet through which air is sucked and passed through the polygonal heat exchanger (110).
2. The outdoor unit (100) as claimed in claim 1, wherein the enclosure (130) has a shroud (160) adapting circumferentially on an inner wall of the enclosure (130), the polygonal heat exchanger (110) extends in a space formed between the enclosure and shroud (160).
3. The outdoor unit (100) as claimed in claim 2, wherein the shroud (160) has a suspended edge (SE) defining a space (S) between the suspended edge (SE) and edges of propellers (P) of a fan (140) that acts as a venturi.
4. The outdoor unit (100) as claimed in claim 1, wherein the unit (100) has an electric section (E) separated from a compressor section (C).
5. The outdoor unit (100) as claimed in claim 1, wherein the polygonal heat exchanger (110) includes shapes such as circular, triangle, square, pentagonal, hexagonal, octagonal, and the like.
6. The outdoor unit (100) as claimed in claim 1, wherein the heat exchanger (110) is held on a holding member (H) of a base (B).