FORM 2
THE PATENT ACT 1970 (as amended)
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
TITLE: “A REFRIGERANT COOLING SYSTEM AND METHOD
THEREOF”
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 ventilating and air conditioning unit of a vehicle. More particularly embodiments relates to a refrigerant cooling system in the heating ventilating and air conditioning unit of the vehicle.
BACKGROUND OF DISCLOSURE
A heating ventilating and air conditioning (HVAC) unit is commonly used in automobiles to provide comfort to passengers in different climatic conditions. Air is drawn into the HVAC unit either from inside the cabin of the automobile or from the outside atmosphere. The drawn air is cooled or heated by the HVAC unit as per passenger needs and is finally delivered to the passenger cabin.
Conventional HVAC unit comprises of the blower assembly, a heater assembly, an evaporator assembly, a duct assembly, a condenser unit and a compressor unit. Said assemblies are housed below the instrument panel/dashboard. Fresh air from the atmosphere or recirculated air from the vehicle cabin is filtered by a filter assembly within the HVAC unit and conditioned air is delivered to cabin through duct assembly.
Condenser unit is a heat exchanger which is used to dissipate heat of the refrigerant carried from inside the cabin into atmosphere. Usually in cars, condenser is fitted in front of radiator and just behind front grille or a suitable packaging space with a refrigerant flow-in port into which high temperature and high pressure gas flows in from condenser and flow-out port from which low temperature and high pressure liquid flows out. The unit may have dedicated fan assembly or can work with other cooling fans behind radiator as deemed correctly.
In order to have better condensation, either condenser size or airflow over condenser has to be increased or multiple condensers are to be fitted. Conventionally multiple condensers are fitted in series with a separate Receiver-Dryer and separate fan for auxiliary condenser. Hence, by providing separate fan for auxiliary condenser increases the electrical power consumption.

In light of forgoing discussion, it is necessary to provide a refrigerant cooling system in HVAC unit of a vehicle to overcome the problems stated above.
STATEMENT OF THE DISCLOSURE
Accordingly, the present disclosure refrigerant cooling system of a vehicle comprising a first condenser having a first compartment and a second compartment for desuperheating and subcooling the refrigerant respectively, wherein a radiator fan supplies air on to the first condenser; a receiver drier integrated in the second compartment of the first condenser to remove moisture in the refrigerant; and a second condenser mounted parallel to the first condenser to which the desuperheated refrigerant from the first compartment is fed for further desuperheating and condensing the refrigerant and said refrigerant from the second condenser is fed to the second compartment for subcooling, wherein an intercooler fan supplies air on to the second condenser, and also provides method of cooling a refrigerant in a vehicle, said method comprises acts of: supplying a refrigerant to a first compartment of a first condenser for desuperheating the refrigerant, wherein air is supplied on to the first condenser by a radiator fan; passing the desuperheated refrigerant from the first compartment of the first condenser to a second condenser for further desuperheating and condensing the refrigerant, wherein air is supplied on to the second condenser by an intercooler fan; and passing the desuperheated and condensed refrigerant from the second condenser to a second compartment of the first condenser for subcooling the refrigerant, wherein moisture in the refrigerant is removed using a receiver drier integrated in the second compartment of the first condenser.
SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the provision of system and method 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 refrigerant cooling system of a vehicle. The system consists of a first condenser having a first compartment and a second compartment for desuperheating and subcooling the refrigerant respectively, wherein a radiator fan supplies air on to the first condenser. A receiver drier integrated in the second compartment of the first condenser to remove moisture in the refrigerant. The system also includes a second condenser mounted parallel to the first condenser to which the desuperheated refrigerant from the first compartment is fed for further desuperheating and condensing the refrigerant and said refrigerant from the second condenser is fed to the second compartment for subcooling, wherein an intercooler fan supplies air on to the second condenser.
In one embodiment of the present disclosure, the first condenser and second condenser consist of plurality of ports for circulating the refrigerant.
In one embodiment of the present disclosure, the first condenser and second condenser are joined using pipes and hoses to complete the refrigeration cycle.
In one embodiment of the present disclosure, condensing capacity of the first condenser is greater than condensing capacity of the second condenser.
The present disclosure is also in relation with a method of cooling a refrigerant in a vehicle. The method fallows steps of supplying a refrigerant to a first compartment of a first condenser for desuperheating the refrigerant, wherein air is supplied on to the first condenser by a radiator fan. Then passing the desuperheated refrigerant from the first compartment of the first condenser to a second condenser for further desuperheating and condensing the refrigerant, wherein air is supplied on to the second condenser by an intercooler fan. Finally passing the desuperheated and condensed refrigerant from the second condenser to a second compartment of the first condenser for subcooling the refrigerant, wherein moisture in the refrigerant is removed using a receiver drier integrated in the second compartment of the first condenser.

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 refrigerant cooling system which provides an optimum condensing to incoming refrigerant.
One object of the present disclosure is to provide a refrigerant cooling system in which consist of a multi port condenser unit for optimum condensing of refrigerant.
One object of the present disclosure is to provide a refrigerant cooling system which has integrated receiver drier for separating moisture from the refrigerant.
One object of the present disclosure is to provide a refrigerant cooling system which is mounted in front of vehicle cool pack and utilizes engine fans to supply the air on to the condensers for condensing the refrigerant.
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 multi port condenser unit of the present disclosure.
FIG. 2 illustrates refrigerant cooling system of the present disclosure.
FIG. 3 illustrates a refrigerant flow circuit in HVAC unit of the vehicle.

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 refrigerant cooling system in HVAC unit of a vehicle which optimally condenses the incoming refrigerant.
FIG. 1 is an exemplary embodiment which illustrates a multi port condenser unit of the present disclosure. The multi port condenser unit includes a first condenser (1) having a first compartment (2) and second compartment (3) for desuperheating and subcooling the refrigerant. The condenser unit further includes a second condenser (5) for desuperheating, and condensing the refrigerant. The first compartment (2) has the parts

such as tubes, fins, headers, and pass separators for desuperheating the refrigerant supplied from a compressor through a flow-in port (11). The first compartment (2) further includes a first flow-out port (12) at its end for passing the refrigerant to next stage. The first condenser (1) assembly also includes a second compartment (3) having plurality of ports and integrated receiver drier (4) for separating moisture from the refrigerant and for subcooling the refrigerant. In one embodiment, the receiver drier (4) absorbs the moisture contained in the refrigerant.
A second condenser (5) is mounted parallel to the first condenser (1) for further desuperheating and condensing the desuperheated refrigerant. The second condenser (5) comprises an inlet port to receive the desuperheated refrigerant from the first compartment (2) and an outlet port for passing the desuperheated and condensed refrigerant to the second compartment for subcooling and separating moisture. The second condenser further comprises tubes, fins, headers, and pass separators for desuperheating and condensing the refrigerant.
In one embodiment the first condenser (1) and second condenser (5) are joined using pipes and hoses (8) to complete the refrigeration cycle. The outlet port (12) of the first compartment (2) is connected to the inlet port of the second condenser (5) through pipes and hoses (8) for supplying the desuperheated refrigerant to the second condenser (5). Further, the outlet port of the second condenser is connected to an inlet port of the second compartment through pipes and hoses (8) for supplying the subsequently desuperheated and condensed refrigerant form second condenser (5) to the second compartment (3) for subcooling and spearing the moisture from the refrigerant.
In one embodiment of the present disclosure, size of the first condenser (1) is greater than the second condenser (5). This is because the first condenser consists of an integrated receiver drier in its second compartment (3) for removing the moisture from the refrigerant. Further, the condensing capacity of the first condenser (1) is greater than the second condenser (5), because the radiator fan supplies more air onto the first condenser. Hence, better condensation is achieved. In addition, capacity of the first condenser (1) and second condenser (5) varies with respect to variation in Tonnage of refrigeration.

FIG. 2 is an exemplary embodiment which illustrates a refrigerant cooling system. In the refrigerant cooling system a first condenser (1) is mounted in vicinity of the radiator (9) and the second condenser (5) is mounted in vicinity of other aggregates such as an intercooler (10) of the vehicle. The radiator fan (6) supplies air on to the first condenser
(1) for desuperheating and subcooling the refrigerant before passing to the air
conditioning unit. And the intercooler fan (7) supplies air onto the second condenser (5)
for further desuperheating and condensing the desuperheated refrigerant. Since, the air
supplied on to the first condenser (1) and second condenser (5) by radiator fan (6) and
intercooler fan (7) respectively, it eliminates the need of separate fans for the condensers
(1 and 5). Hence, it saves the electrical power consumption which inturn improves the
engine performance.
FIG. 3 is an exemplary embodiment which illustrates a refrigerant flow circuit in HVAC unit of the vehicle. The refrigerant flow circuit consists of a compressor, a condenser (i.e refrigerant cooling system), an expansion valve and an evaporator. The evaporator mounted under the instrument panel is connected by various pipes and hoses with compressor. The compressor compresses the hot refrigerant coming out of evaporator and supplies the high pressure and high temperature refrigerant to the refrigerant cooling system (condenser) for desuperheating, condensing and subcooling the refrigerant. The expansion valve is placed between the condenser and evaporator for reducing the pressure of the condensed refrigerant and supply the low pressure refrigerant to the evaporator.
In one embodiment, the first condenser (1) has an inlet port (11) while a first flow-outlet port (12) at the end of first pass. The hottest refrigerant from compressor is supplied into the first compartment (2) via an inlet port (11) for desuperheating, the first compartment
(2) acts as a first passage for the refrigerant. The refrigerant after getting desuperheated in
first pass using air draft from the radiator fan (6), moves down to second condenser (5)
for further desuperheating and condensing. And here the intercooler fan (7) supplies air
onto the second condenser for desuperheating and condensing. The auxiliary condenser
acts as second pass for the refrigerant. The refrigerant from second condenser (5) passed

to the second compartment (3) from there it enter into receiver-dryer (4) which is integrated in the second compartment for separating the moisture. And finally the refrigerant passed through sub-cooling zone, then goes out into air conditioning circuit.
The present disclosure provides a refrigerant cooling system which uses a radiator fan and intercooler fan to supply the air onto the condensers which reduces the electrical power consumption.
The present disclosure provides a refrigerant cooling system which has an integrated receiver drier which reduces the pipe joints, and probabilities of minute leakage are less.
The present disclosure provides a refrigerant cooling system which has a pair of condensers assembled in parallel hence it provides optimum condensation to the refrigerant.
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
1 First condenser
2 First compartment
3 Second compartment
4 Receiver drier
5 Second condenser
6 Radiator fan
7 Intercooler fan
8 Pipes and hoses
9 Radiator
10 Intercooler

We claim
1. A refrigerant cooling system of a vehicle comprising:
a first condenser (1) having a first compartment (2) and a second compartment (3) for desuperheating and subcooling the refrigerant respectively, wherein a radiator fan (6) supplies air on to the first condenser (1);
a receiver drier (4) integrated in the second compartment (3) of the first condenser (1) to remove moisture in the refrigerant; and
a second condenser (5) mounted parallel to the first condenser (1) to which the desuperheated refrigerant from the first compartment (2) is fed for further desuperheating and condensing the refrigerant and said refrigerant from the second condenser (5) is fed to the second compartment (3) for subcooling, wherein an intercooler fan (7) supplies air on to the second condenser (5).
2. The system as claimed in claim1, wherein the first condenser (1) and second condenser (5) consist of plurality of ports for circulating the refrigerant.
3. The system as claimed in claim 1, wherein the first condenser (1) and second condenser (5) are joined using pipes and hoses (8) to complete the refrigeration cycle.
4. The system as claimed in claim 1, wherein condensing capacity of the first condenser (1) is greater than condensing capacity of the second condenser (5).
5. A method of cooling a refrigerant in a vehicle, said method comprises acts of:
supplying a refrigerant to a first compartment (2) of a first condenser (1) for desuperheating the refrigerant, wherein air is supplied on to the first condenser (1) by a radiator fan (6);
passing the desuperheated refrigerant from the first compartment (2) of the first condenser (1) to a second condenser (5) for further desuperheating and

condensing the refrigerant, wherein air is supplied on to the second condenser (5) by an intercooler fan (7); and
passing the desuperheated and condensed refrigerant from the second condenser (5) to a second compartment (3) of the first condenser (1) for subcooling the refrigerant, wherein moisture in the refrigerant is removed using a receiver drier (4) integrated in the second compartment (3) of the first condenser (1).
6. A heating ventilating and air conditioning unit of a vehicle comprising a refrigerant cooling system as claimed in claim 1.
7. A vehicle comprising a refrigerant cooling system as claimed in claim 1.
8. A refrigerant cooling system of a vehicle and method of cooling a refrigerant in a vehicle are substantially as herein above described and as illustrated in accompanying drawings.