Claims:WE CLAIM :
1. An enclosure system of an Air Handling Unit (AHU), the AHU including a blower, a heat exchanger, and a motor for driving the blower, said motor having a fan for providing a cooling effect for the motor, the enclosure system comprising:
an inner enclosure for enclosing the air filter, the blower and the heat exchanger of the AHU, said inner enclosure having an inlet for receiving external air and an outlet for providing conditioned air to a room;
an outer enclosure around the inner enclosure, said outer enclosure spaced apart from the inner enclosure to form a hollow space therebetween; and
a motor enclosure for enclosing the motor and the fan and isolating the motor from the other parts of the AHU, said motor enclosure having at least one inlet for receiving the external air, wherein the external air absorbs heat dissipated by the motor, resulting in formation of hot air, and wherein the motor enclosure has at least one outlet connected to an inlet to the hollow space for directing the hot air to flow through the hollow space such that the hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure.
2. The enclosure system as claimed in claim 1, wherein the hot air is released from the hollow space through an outlet of the hollow space into external atmosphere.

3. The enclosure system as claimed in claim 1, wherein the hot air is released from the hollow space through an outlet of the hollow space and is fed onto the heat exchanger or into the blower of the AHU, thereby recycling the hot air for formation of the conditioned air.

4. An Air Handling Unit (AHU) comprising:
a blower;
a heat exchanger;
a motor for driving the blower, said motor having a fan for providing a cooling effect for the motor;
an inner enclosure for enclosing the blower, the motor, and the heat exchanger, said inner enclosure having an inlet for receiving external air and an outlet for providing conditioned air to a room;
an outer enclosure around the inner enclosure, said outer enclosure spaced apart from the inner enclosure to form a hollow space therebetween; and
a motor enclosure for enclosing the motor and the fan and isolating the motor from the other parts of the AHU, the motor enclosure having at least one inlet for receiving the external air, wherein the external air absorbs heat dissipated by the motor resulting in formation of hot air, and wherein the motor enclosure has at least one outlet connected to an inlet to the hollow space for directing the hot air to flow through the hollow space such that the hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure.

5. The AHU as claimed in claim 4, wherein the hot air is released from the hollow space through an outlet of the hollow space into external atmosphere.

6. The AHU as claimed in claim 4, wherein the hot air is released from the hollow space through an outlet of the hollow space and is fed onto the heat exchanger or into the blower of the AHU, thereby recycling the hot air for formation of the conditioned air.

7. An enclosure system for an Air Handling Unit (AHU), said enclosure system comprising:
an inner enclosure for enclosing one or more components of the AHU; and
an outer enclosure around the inner enclosure, said outer enclosure spaced apart from the inner enclosure to form a hollow space therebetween, said outer enclosure having an inlet for receiving hot air from an external source, wherein the hot hair is circulated through the hollow space such that the hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure.

8. The enclosure system as claimed in claim 7, wherein the external source includes heat dissipated by a motor placed outside the AHU.
Dated this 24th day of August, 2016
FOR BLUE STAR LIMITED
By their Agent

(GIRISH VIJAYANAND SHETH) (IN/PA – 1022)
KRISHNA & SAURASTRI ASSOCIATES LLP
, Description:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&

THE PATENS RULES, 2003

COMPLETE SPECIFICATION
[See section 10, Rule 13]

AN ENCLOSURE SYSTEM OF AN AIR HANDLING UNIT AND AIR HANDLING UNIT THEREOF;


BLUE STAR LIMITED, A COMPANY INCORPORATED UNDER COMPANIES ACT 1956, WHOSE ADDRESS IS KASTURI BUILDINGS, MOHAN T. ADVANI CHOWK, JAMSHETJI TATA ROAD, MUMBAI-400020, MAHARASTRA, INDIA

THE FOLLOWING SPECIFICATION PARICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED:

FIELD OF THE INVENTION
The present invention relates generally to Heating, Ventilation, and Air Conditioning (HVAC) systems, and more particularly, to an enclosure system of an Air Handling Unit (AHU) of the HVAC systems for condensation control.

BACKGROUND OF THE INVENTION
Heating, ventilation and air conditioning (HVAC) systems are commonly used in many climate control applications. Air Handling Units (AHUs) are one of several components in HVAC systems. Air handling unit (AHU) is a lung of any HVAC system as the AHU houses a number of components used in the system to provide forced air for climate control in a particular structure. The AHU takes in outside air, reconditions by filtering and either heating or cooling) the air and supplies the reconditioned air as fresh air to the air conditioned room.
AHU components typically include motors, heating/cooling coils, and blowers as well as the required interface connections to these components to affect such climate control. Air filters are located in up-stream of heat exchanger. The fans and blowers are driven by electrical motors. The entire arrangement is housed in a casing. Standard AHU enclosure construction uses sheet metal construction with a type of foam insulation (i.e. Polyurethane foam) to provide some sort of insulation. The problem with standard construction is that there are many points where the outside metal is in direct contact with the inside metal due in the inability of the foam insulation in providing any structure to the enclosure. Further, metal is a very good conductor of heat, these through-metal points allowing a significant amount of energy to be lost. The AHU is used to get the desired reduction in temperature and the heat exchangers are designed to get downstream air at around 12 to 14 degree Celsius. To achieve this temperature of air, the heat exchanger has lower temperature with delta in temperature of around 5 to 6 degree Celsius. With this the temperature in the enclosed area is same as that of down-stream air. When the temperature outside the AHU casing is higher, maximum heat transfer across the casing takes place. It is very well known that even if the casing is insulated, heat transfer at some extent does take place. The structure adopted of the casing is usually aluminum frame on which the sandwich insulated panels are fixed. It is usually observed that when the outer surface of the casing reaches the temperature below the dew point the moisture from the air starts condensing and over a period of time starts dripping when the humidity is high, making the floor near AHU wet and/or slippery.
Therefore, there is a need of an enclosure system which overcomes the aforesaid issues.
SUMMARY OF THE INVENTION
The present invention provides an enclosure system of an Air Handling Unit (AHU) and an AHU thereof.
In an embodiment, an enclosure system of an AHU is provided. The AHU includes a blower, a heat exchanger, and a motor for driving the blower. The motor has a fan for providing a cooling effect for the motor. The enclosure system comprises an inner enclosure, an outer enclosure, and a motor enclosure. The inner enclosure encloses the blower and the heat exchanger of the AHU. The inner enclosure has an inlet for receiving external air and an outlet for providing conditioned air to a room. The outer enclosure is placed around the inner enclosure. The outer enclosure is spaced apart from the inner enclosure to form a hollow space therebetween. The motor enclosure encloses the motor and the fan and isolates the motor from the other parts of the AHU. The motor enclosure has at least one inlet for receiving the external air. The external air absorbs heat dissipated by the motor which results into formation of hot air. The motor enclosure also has at least one outlet connected to an inlet of the hollow space for circulating the hot air through the hollow space such that the hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure.
In another embodiment, the present invention provides an AHU comprising a blower, a heat exchanger, a motor for driving the blower, an inner enclosure, an outer enclosure, and a motor enclosure. The motor has a fan for providing a cooling effect for the motor. The inner enclosure encloses the blower, the motor, and the heat exchanger. The inner enclosure has an inlet for receiving external air and an outlet for providing conditioned air to a room. The outer enclosure is placed around the inner enclosure. The outer enclosure is spaced apart from the inner enclosure to form a hollow space there between. The motor enclosure encloses the motor and the fan and isolates the motor from the other parts of the AHU. The motor enclosure has at least one inlet for receiving the external air. The external air absorbs heat dissipated by the motor which results into formation of hot air. The motor enclosure has at least one outlet connected to an inlet of the hollow space for circulating the hot air through the hollow space such that the hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure.
In another embodiment, the present invention provides an enclosure system for an AHU. The enclosure system includes an inner enclosure and an outer enclosure. The inner enclosure encloses one or more components of the AHU. The outer enclosure is placed around the inner enclosure to form a hollow space therebetween. The outer enclosure has an inlet for receiving hot air from an external source. The hot air is circulated through the hollow space such that the hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure.
BRIEF DESCRIPTION OF DRAWINGS
Reference will be made to embodiments of the invention, example of which may be illustrated in the accompanying figure(s). These figure(s) are intended to be illustrative, not limiting. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1 shows an enclosure system of an Air Handling Unit (AHU) according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION
Accordingly, the present provides an enclosing system for an Air Handling Unit and an Air Handling unit.
In an embodiment, an enclosure system of an Air Handling Unit (AHU) is provided. The AHU includes a blower, a heat exchanger, and a motor for driving the blower. The motor has a fan for providing a cooling effect for the motor. The enclosure system comprises an outer enclosure, an inner enclosure, and a motor enclosure. The inner enclosure encloses the blower, and the heat exchanger. The inner enclosure has an inlet for receiving external air and an outlet for providing conditioned air to a room. The outer enclosure is placed around the inner enclosure and is spaced apart to form a hollow space therebetween. The motor enclosure encloses the fan and isolates the motor from other parts of the AHU. The motor enclosure has at least one inlet for receiving the external air. The air is heated by because of heat dissipated by the motor to form hot air. The motor enclosure further has an outlet connected to an inlet of the hollow space for circulating the hot air through the hollow space between the outer and inner enclosures. The hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure.
In another embodiment, the present invention provides an Air Handling Unit (AHU) comprising a blower, a heat exchanger, and a motor for driving the blower, and a fan for providing a cooling effect for the motor. The AHU further comprises an inner enclosure, an outer enclosure, and a motor enclosure. The inner enclosure encloses the blower, and the heat exchanger. The inner enclosure has an inlet for receiving external air and an outlet for providing conditioned air to a room. The outer enclosure is placed around the inner enclosure and is spaced apart to form a hollow space therebetween. The motor enclosure encloses the fan and isolates the motor from other parts of the AHU. The motor enclosure has at least one inlet for receiving the external air. The air is heated by because of heat dissipated by the motor to form hot air. The motor enclosure further has an outlet connected to an inlet of the hollow sphere for circulating the hot air through the hollow space between the outer and inner enclosures. The hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure.
In yet another embodiment of the present invention, an enclosure system for an AHU is provided. The enclosure system includes an inner enclosure and an outer enclosure. The inner enclosure encloses one or more components of the AHU. The outer enclosure is placed around the inner enclosure to form a hollow space therebetween. The outer enclosure has an inlet for receiving hot air from an external source. The hot air is circulated through the hollow space such that the hot air raises the temperature of the outer enclosure and prevents condensation of the external air proximate to the outer enclosure. The subject matter is now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purpose of explanation, numerous specific details are set forth in order to provide a thorough understanding of the claimed subject matter. It may be evident however, that such matter can be practiced with these specific details. In other instances, well-known structures as shown in diagram form in order to facilitate describing the invention.
Referring Figure 1 shows an enclosure system (100) of an Air Handling Unit (102) in accordance with an embodiment of the present invention. The AHU (102) includes a blower (110), a motor (120), a motor fan (130), an air filter (191), a heat exchanger (192), and a base frame (193).
The air filter (191) filters the external air (155) entering the AHU (102) and removes minute dust particles present in the external air. This helps to keep the components of the AHU (102) dust-free and clean and helps to extend working life of the AHU (102). The heat exchanger (192) includes cooling coils or evaporators used to cool the external air (155) passing over the heat exchanger (192). The cooled air is also referred to as conditioned air and is provided to indoor rooms or buildings through indoor units fitted therein. The AHU (102) may include one or more blowers, including the blower (110), for directing either the conditioned air or the external air (155) inside or outside of the AHU (102). The blower is driven by the motor (120).
The enclosure system (100) further comprises an inner enclosure (190), an outer enclosure (180), and a motor enclosure (160). The outer enclosure (180) is spaced apart from the inner enclosure (190) which creates a hollow space (170) between the inner and outer enclosures (190 and 180).
The motor enclosure (160) encloses the motor (120) and the motor fan (130). The motor fan (130) provides cooling effect for the motor (120).
The motor enclosure (160) has an inlet (150) for receiving the external air (155). The external air (155) enters the motor enclosure (160) through the inlet (150) where the external air (155) is heated due to heat dissipated by the motor (120). This results into formation of hot air (165).
The motor enclosure (160) further has two outlets (140 and 145) connected to two inlets (171 and 172) of the hollow space (170) to circulate the hot air (165) into the hollow space (170). The motion of the motor fan (130) and blower (110) directs the hot air (165) to circulate uniformly through the hollow space (170). This raises temperature of the hollow space (170) and of the outer enclosure (180) above the dew point of the external environment, thereby preventing condensation of the external air (155) over the outer enclosure (180).
Advantageously, the hollow space (170) has at least one outlet (173) for directing the hot air (165) to flow into the blower (110). The blower (110) directs the hot air (165) to flow out of the AHU (102).
In another embodiment of the present invention, the hot air (165) is fed to the heat exchanger (192) where it is turned into conditioned air and circulated into indoor room. This helps in recycling the hot air for the formation of conditioned air. In yet another embodiment of the present invention, the outer enclosure (180) has an inlet connected to an external source of heat. The external source of heat may include fuel-based heating element. In an exemplary embodiment, the motor (120) of the AHU (102) is placed outside the AHU (102) and the air heated by the heat dissipated by the motor (120) is circulated through the hollow space (170).
The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Further, it will be apparent to one of the ordinary skill in the art that many modifications, improvements and sub-combinations of the various embodiments, adaptations and variations can be made to the invention without departing from the scope thereof as claimed in the following claims: