FORM 2
THE PATENT ACT 1970 (as amended)
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
TITLE: “HVAC WITH CONDENSER IN ENGINE AIR INTAKE PATH AS A
PRIMARY AIR FILTER”
Name and address of the Applicant:
TATA MOTORS LIMITED, an Indian company having its registered office at Bombay
house, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001, Maharashtra, INDIA.
Nationality: INDIAN
The following specification particularly describes the invention the manner in which it is to be performed.

TECHNICAL FIELD
Embodiments of the present disclosure relates to a Heating Ventilation and Air Conditioning system of a vehicle. More particularly embodiments relates to a refrigerant cooling system in the Heating Ventilation and Air Conditioning system of the vehicle and air intake system for the engine of the vehicle
BACKGROUND OF DISCLOSURE
A Heating Ventilation and Air Conditioning (HVAC) system is commonly used in automobiles to provide comfort to passengers in different climatic conditions. Air is drawn into the HVAC system either from inside the cabin of the automobile or from the outside atmosphere. The drawn air is cooled or heated by the HVAC system as per passenger needs and is finally delivered to the passenger cabin.
The HVAC system comprises of a compressor, condenser, receiver dryer, expansion valve, evaporator and control unit .This close loop system is filled with a chemical (refrigerant). The compressor compresses the refrigerant to high pressure and this high pressure refrigerant is passed through a heat exchanger/condenser in order to liquefy the refrigerant. This process becomes more effective if additional surrounding air or any other media like heat absorbing liquid is allowed to flow over the heat exchanger by external means.
Conventionally, the condenser is mounted in the path of ram air or a fan is fitted to blow the additional air across the heat exchanger to increase the air flow onto the condenser. However, due to component packaging constraints, condenser is not always provided in ram air path. The new location near the radiator fan may also not be suitable for heat exchange with fan because of hot air recirculation at that particular location. Hence, in order to have better condensation, either condenser size or airflow over condenser has to be increased or multiple condensers are to be fitted.
In an alternative way, multiple condensers are fitted in series with a separate Receiver-Dryer and separate fan for auxiliary condenser to effectively liquefy the refrigerant. Hence, by providing separate fan for auxiliary condenser increases the electrical power consumption in the vehicle.

In light of forgoing discussion, it is necessary to provide effective heat exchanging methods for refrigerant cooling system in HVAC unit of a vehicle to overcome the problems stated above.
STATEMENT OF THE DISCLOSURE
Accordingly, the present disclosure provides a Heating Ventilation and Air Conditioning system of a vehicle comprising, a compressor for compressing a refrigerant; a condenser for condensing the refrigerant; receiver-drier as accumulator and dehumidifier for condensed refrigerant, Expansion valve to reduce pressure from condenser pressure to evaporator pressure and regulate the refrigerant flow from the high-pressure liquid line into the evaporator at a rate equal to the evaporation rate in the evaporator, the evaporator to evaporate the refrigerant; characterized in that, the condenser is mounted proximal to mouth of engine air intake duct or inside the mouth of engine air intake duct, wherein the air sucked by the engine air intake duct will circulate around the condenser to condense the refrigerant.
SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the provision of system as claimed in the present disclosure.
Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
One embodiment of the present disclosure provides a Heating Ventilation and Air Conditioning system of a vehicle. The system comprises a compressor for compressing a refrigerant, a condenser for condensing the refrigerant, receiver-drier as accumulator and dehumidifier for condensed refrigerant. An expansion valve is provided in the system to reduce pressure from condenser pressure to evaporator pressure and regulate the refrigerant flow from the high-pressure liquid line into the evaporator at a rate equal to the evaporation rate in the evaporator. The evaporator is provided in the system to evaporate the refrigerant. According to aspect of the present disclosure, the condenser is mounted proximal to mouth of engine air intake duct or inside the mouth of engine air intake duct and air sucked by the engine air intake duct will circulate around the condenser to condense the refrigerant.

In one embodiment of the present disclosure, the condenser comprises condenser tubes for circulating the refrigerant and plurality of fins on the condenser tubes to increase the surface area of cooling, and the fins acts as primary filter to filter the air sucked by the engine air duct before supplying the air to the engine.
In one embodiment of the present disclosure, the system further comprises plurality of fins in engine air intake duct to divert the air onto the condenser placed inside the mouth of the engine air intake duct.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
OBJECTIVES OF THE DISCLOSURE
One object of the present disclosure is to provide a heating ventilation and air conditioning system of a vehicle which has condenser unit mounted on mouth of engine air intake duct to facilitate heat rejection from condenser by way of air being sucked across condenser by engine aspiration.
One object of the present disclosure is to provide a heat ventilating and air conditioning system which provides an optimum condensing to incoming refrigerant in condenser.
One object of the present disclosure is to provide a heating ventilation and air conditioning system of a vehicle which has condenser unit mounted on mouth of engine air intake duct to provide a primary filtering action to engine intake air.
One object of the present disclosure is to provide a heating ventilation and air conditioning system which conserve engine power by eliminating the need of electric fan used for providing air mass flow on condenser for heat exchange.

BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
FIG. 1 illustrates a refrigerant flow circuit in HVAC system of the vehicle according to present disclosure.
FIG. 2a illustrates a schematic of vehicle structure having a condenser mounted proximal to mouth of engine air intake duct.
FIG. 2b illustrates a schematic of vehicle structure having a condenser mounted inside mouth of engine air intake duct.
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure,

both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
To overcome the drawbacks mentioned in the background the present disclosure provides a HVAC system having a condenser mounted on mouth of the engine air intake duct to optimally condense the incoming refrigerant in condenser.
As an exemplary embodiment FIG. 1 illustrates a refrigerant flow circuit in Heating Ventilation and Air Conditioning system of the vehicle. The refrigerant flow circuit consists of a compressor (101), a condenser (102) (i.e. refrigerant cooling system), an expansion valve (105), a receiver-drier (103) and an evaporator (104). The evaporator (104) is mounted under the instrument panel/vehicle dash board is connected by various pipes and hoses with compressor (101). The compressor (101) compresses the hot refrigerant coming out of evaporator (104) and supplies the high pressure and high temperature refrigerant to the refrigerant cooling system/condenser (102) for desuperheating, condensing and subcooling the refrigerant. The receiver-drier (103) accumulates and dehumidify condensed refrigerant. An expansion valve (105) reduces refrigerant pressure from high pressure to low pressure and regulates the refrigerant flow from the high-pressure liquid line into the evaporator at a rate equal to the evaporation rate in the evaporator (104).
FIG. 2a and 2b are exemplary embodiments illustrating a schematic of vehicle structure (200), the condenser (102) is mounted at the entry of fresh air to the engine, inside mouth of the engine air intake duct/snorkel (202) or proximal to mouth engine air intake duct/snorkel (202). The condenser (102) is connected with refrigerant inlet pipe (102a) and outlet pipe (102b) which carries high temperature, high pressure refrigerant and liquefied high pressure refrigerant respectively. The air sucked by the engine (201) will pass through the condenser (102) and the condenser (102) exchanges the heat contained in the refrigerant flowing through the tubes of the condenser (102) with the air sucked by engine through air intake to liquefy the refrigerant. The engine (201) will suck the air through the condenser (102) and heat contained in refrigerant

inside the condenser (102) tube / pipe structure gets exchanges with the air passing across the condenser (102) tubes through duct (203) to the engine (201).
The vehicle has the engine (201) mounted under the body, the engine (201) draws fresh air from atmosphere through engine air duct (203) mounted on vehicle body. The mouth of engine air duct/snorkel (202) is connected to engine via duct (203) to supply fresh/combustion air to the engine. Air sucked by the engine air duct (203) is passed through turbocharger (204) for increasing the pressure of the air. An intercooler (206) is provided for cooling the pressured air before supplying to the engine (201) for combustion.
According to present disclosure, the condenser (102) of the heating ventilation and air conditioning system (100) is mounted at the entry of fresh air to the engine, proximal to the mouth of air intake duct/snorkel (202) as shown in FIG. 2a. The condenser (102) positioned proximal to mouth (202) of air intake duct (203) such a way that the air flowing to the to the engine (201) flows on the condenser (102) to facilitate cooling of the refrigerant. In one aspect of the present disclosure, the condenser (102) of the heating ventilation and air conditioning system (100) is mounted inside the mouth of air intake duct (203). The condenser (102) is connected with refrigerant inlet (102a) from the compressor (101) to receive high temperature high pressure refrigerant from the compressor (101) and outlet pipes (102b) connected to the receiver-drier (103) for supplying the high pressure refrigerant to receiver-drier (103). The condenser (102) comprises tubes to pass the refrigerant and liquefy the refrigerant, also Plurality of fins on the tubes to increase the surface area of cooling.
When engine (201) of the vehicle starts, the air required for the combustion will be sucked by the engine (201) through air duct (203), the sucked air flow through the condenser (102) which is mounted on mouth of the air duct (202). When HVAC system (100) is started, high pressure high temperature refrigerant will flow through the condenser tubes. The engine air flowing across the condenser tubes will take away the heat of the compressed refrigerant and will liquefy the refrigerant. The liquefied refrigerant will further flow to receiver-drier (103) and then through expansion valve (105) to evaporator (104) to cool the cabin (208). In one embodiment of the present disclosure, the condenser (102) can be mounted inside the mouth of engine air duct (203) to effectively liquefy the refrigerant. Fins / Deflector / Shroud can be provided on the mouth of

engine air duct (203) to divert the air sucked by the engine (201) through the engine air duct onto the condenser (102).
The mounting of the condenser (102) proximal to the mouth (202) of the engine air duct (203) or in the mouth (202) of the engine air duct (203) is critical aspect according to the present disclosure. The positioning of condenser (102) at engine air inlet makes the heat ventilating and air conditioning system simple by eliminating the use of fans to supply air onto the condenser (102) for liquefying the refrigerant, which in turn results in less power consumption from vehicle battery.
In one embodiment of the present disclosure, the condenser (102) mounted proximal to the mouth (202) of the engine air duct (203) or inside the mouth (202) of the engine air duct (203) acts as a primary filter to filter the air sucked by the engine (201) through engine air duct (203). The fins on the condenser tubes acts as filter to the air sucked by the engine (201). The fins restrict passage dust and unwanted object in to the engine (201). Therefore, the condenser (102) acts as primary filter to engine (201) of the vehicle. The engine (201) may have regular air filter and said filer acts as secondary filter. The air passing through the condenser (102) will take away the heat from condenser (102) and the engine (201) will get hot filtered air when the condenser (102) is mounted proximal to the mouth (202) of the engine air duct (203) or inside the mouth (202) of the engine air intake duct (203).
Advantages:
The present disclosure provides a heating ventilation and air conditioning system of a vehicle which has condenser unit mounted on mouth of engine air intake duct to facilitate liquefaction of the refrigerant.
The present disclosure provides a heating ventilation and air conditioning system which provides an optimum condensing to incoming refrigerant in condenser.
The present disclosure provides a heating ventilation and air conditioning system of a vehicle which has condenser unit mounted on mouth of engine air intake duct to provide a primary filtering action to engine intake air.

The present disclosure provides a heating ventilation and air conditioning system which conserve engine power by eliminating the need of electric fan used for providing air mass flow for heat exchange.
Equivalents
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a

construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Referral Numerals;

Reference Number Description
100 Heating Ventilation and Air Conditioning System
101 Compressor
102 Condenser
102a and 102b Inlet pipe and outlet pipe of the condenser
103 Receiver-drier
104 Evaporator
105 Expansion Valve
200 Schematic view of vehicle

201 Engine
202 Mouth of engine air intake duct
203 Engine air intake duct
204 Turbocharger
205 Intercooler pipe
206 Intercooler
207 Vehicle dash board
208 Vehicle Cabin

We claim
1. A Heating Ventilation and Air Conditioning System (100) of a vehicle comprising:
a compressor (101) for compressing a refrigerant;
a condenser (102) in fluid communication with the compressor (101) for condensing the refrigerant;
a receiver-drier (103) in fluid communication with the condenser (102), said receiver-drier (103) acts as accumulator and dehumidifier for condensed refrigerant,
an expansion valve (105) in fluid communication with receiver-drier (103) to reduce pressure from condenser pressure to evaporator pressure and regulate the refrigerant flow from the high-pressure liquid line into a evaporator (104) at a rate equal to the evaporation rate in the evaporator (104); and
the evaporator (104) in fluid communication with an expansion valve (105) to evaporate the refrigerant; Characterized in that,
the condenser is mounted proximal to mouth (202) of engine air intake duct (203) or inside the mouth (202) of engine air intake duct (203), wherein the air sucked by the engine air intake duct (203) will circulate around the condenser (102) to condense the refrigerant.
2. The system as claimed in claim 1, wherein the condenser (102) comprises condenser tubes for circulating the refrigerant and plurality of fins on the condenser tubes to increase the surface area of cooling.
3. The system as claimed in claim 2, wherein the fins acts as primary filter to filter the air sucked by the engine air intake duct (203) before supplying the air to the engine (201).
4. The system as claimed in claim 1 further comprises plurality fins on the mouth (202) of engine air intake duct (203) to divert the air onto the condenser (102) placed inside the mouth (202) of the engine air intake duct (203).

5. A vehicle comprising a Heating Ventilation and Air Conditioning System (100) as claimed in claim 1.