Description:TECHNICAL FIELD
[0001] The present disclosure in general relates to an exhaust gas cooling system for reducing automotive nitrogen oxide (NOx) emissions. More specifically, the present disclosure relates to an efficient & cost-effective unit by introducing a heat exchanger inside a lower tank of a radiator unit for cooling an exhaust gas coming from an exhaust manifold.

BACKGROUND OF THE INVENTION
[0002] Background description includes information that may be useful in understanding the present invention. It is an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Nowadays, environmental concerns have become a strong motive to innovate. In addition, the increasing stringency of current and future exhaust emission recirculation is also placing high demands on uncontrolled engine emissions and the exhaust gas after treatment of internal combustion engines.
[0004] The requirements for further decreases in fuel consumption and the continual tightening of exhaust emission standards with regard to allowable nitrogen oxides emissions pose a challenge for engine developers.
[0005] In order to overcome the raised emission concern, most of the engine developers has proposed an exhaust gas recirculation unit (EGR) that reduces the amount of oxides of Nitrogen produced by the engine during operating periods. In general, the NOx emissions arises when the combustion temperature is high. In other words, NOx is generally formed in high concentrations whenever combustion temperatures reach near adiabatic flame temperature.
[0006] Therefore, an EGR unit is introduced that reduces NOx production by circulating required amounts of exhaust gases into the intake manifold where it mixes with the incoming air. By mixing the EGR with intake air, peak combustion temperatures and pressures are reduced, resulting in an overall reduction of NOx output.
[0007] In addition, EGR flow should match engine operating conditions such as higher EGR flow is necessary, when combustion temperatures are typically very high. Low EGR flow is needed during low speed and light load conditions and no EGR flow should occur during engine warm up, idle and full throttle condition so that EGR operation could not adversely affect engine operating efficiency or vehicle drivability. In addition, during cold start and high altitude condition, optimized EGR unit is required.
[0008] FIG.1 illustrates a perspective view of an EGR unit 100-E along with an engine cooling unit. Here in the EGR unit, a first end 112-F of an EGR cooler 112 of the EGR unit 100-E is connected to an exhaust manifold 104 through an inlet EGR cooler pipe 110 and a second end 112-S of the EGR cooler 112 is connected to an EGR valve 116 through an inlet EGR valve pipe 114. The EGR valve 116 is connected to an intake manifold 120 through an inlet pipe 118. The EGR valve 116 is introduced for regulating the amount of exhaust gas flowing inside the intake manifold 120. In the intake manifold 120 the exhaust gas is mixed with the intake fresh air entering to the intake manifold through the inlet port that results in an overall reduction in NOx emissions.
[0009] It further illustrates the engine cooling unit that includes a radiator unit 100-R. The EGR unit 100-E takes water as a coolant from the radiator unit 100-R that enters through pump 122 into the EGR cooler 112 for reducing the temperature of the exhaust gas. The pump 122 transfers cold water to the EGR cooler 112 through a pipe 124 connected at the first end of the EGR cooler 112 and carry the hot water from the pipe 126 connected at the second end 112-S of the EGR cooler 112.
[0010] The pump 122 also circulates cold water inside the engine (crank case along with the cylinder head) in order to carry away the heat generated due to the combustion of fuel inside the engine. This circulation of cold water only happens, when the temperatures rises above a certain level. Here, a thermostat valve plays a major function. Hence, when the temperature of the engine increases beyond a certain limit, the thermostat valve (not shown) got opened that results in the circulation of the cold water from the radiator unit 100-R to the engine. After that this cold water carries away the heat from the engine and becomes hot and then again enters the radiator unit 100-R. The complete configuration of the radiator unit 100-R is stated below and clearly illustrated in FIG.2. The radiator unit 100-R is a part of the engine cooling unit as shown in FIG.2.
[0011] FIG.2A depicts a rear view of the radiator unit while viewing from the front of the vehicle.
[0012] FIG.2B depicts a front view of the radiator unit while viewing from the front of the vehicle.
[0013] The radiator unit 100-R consists of a radiator core 128 placed at a center of the radiator unit 100-R including multiple number of parallel tubes 128-T fitted along the length of the radiator unit with fins 128-F extending outwards from that tubes in a transverse direction. It further comprises an upper tank 130 attached at a top of said radiator core 128, wherein an inlet port 130-I is positioned at a center coupled with a thermostat ( not shown ) that is further connected with a hose carrying hot water from an engine. It also includes a filler neck 130-F that is provided at a center of a top of the upper tank 130, and a lower tank 132 attached at a bottom of said radiator core 128 for retaining the cold water is also provided with an outlet port 132-O at an extreme right side of the radiator while viewing from the rear of the vehicle.
[0014] The thermostat (not shown) as mentioned is connected with the inlet port 130-I of the radiator core 128. The thermostat here acts as a valve that opens and closes as per the temperature of the water coming from the engine towards the engine cooling unit. The thermostat isolates the engine from the radiator unit 100-R until the engine reached a certain required temperature. Without a thermostat, the engine would always lose heat to the radiator unit 100-R and take longer to warm up.In brief, the thermostat works only when the engine temperature reaches above the required temperature that needs to be maintained in the engine.
[0015] FIG.3 illustrates the cross-sectional view of an existing exhaust gas recirculation unit 100-E that includes an exhaust pipe 110 transferring the exhaust gas from the exhaust manifold 104 placed near to cylinder head 102 that is further transferred to Diesel Oxidation Catalyst (DOC) 108 for breaking down the pollutants in the exhaust stream from a diesel engine, which in turn results in reduction of hydrocarbons (HC) & particulate matter (PM). Here, both carbon monoxide and hydrocarbons are converted in to carbon dioxide and water vapour.
[0016] After DOC 108, the exhaust gas enter to the EGR cooler 112 through inlet EGR cooler pipe 110 that is connected with a first end 112-F of the EGR cooler. Here, the EGR cooler 112 acts as a heat exchanger in which the water as a coolant from the radiator unit (not shown) enters through pump (not shown) that helps in extracting the heat from the exhaust gas or reducing the temperature of the exhaust gas. After that the exhaust gas enters the intake manifold 120 through an inlet EGR valve pipe 114 which is further connected with an inlet pipe of the intake manifold 120. The inlet EGR valve pipe 114 is connected with the second end 112-S of the EGR cooler through multiple number of flanges. In between the inlet EGR valve pipe 114 and the inlet pipe of the intake manifold 120, an EGR valve 116 is fitted that regulates the amount of exhaust gas entering the intake manifold 120 through inlet pipe 118. As shown in the multiple pipes are connected with one another through multiple number of flanges.
[0017] As per the existing requirement, there is always a need of incorporation of a separate EGR cooler 112 in the engine cooling unit 100 to cool the exhaust gas coming from the exhaust manifold 104. It further requires multiple amount of flanges, and pipes of different diameter in order to build up the connection between the exhaust manifold 104, and intake manifold 120 for a proper treatment of exhaust gas. This arrangement of the EGR unit increases the overall cost of the vehicle and make the engine complicated.
[0018] In order to overcome the above-mentioned problems, the prior arts related to this particular field of technology defined a unit that utilizes the exhaust gas to reduce the combustion temperature and retard the valve timings that in turn results in less NOx emissions. Similarly, some of the prior arts has also proposed the changes in the configuration of the cam that results in the change in the timings of opening & closing of the intake as well as exhaust valves that also results in the less NOx emissions.
[0019] Most of the existing prior arts related to this particular field of technology fails to provide an effective unit that properly utilizes the heat and kinetic energy of the exhaust gases that in turns increases the overall efficiency of the vehicle and provide better control in the NOx emissions under varying load and speed conditions.
[0020] Therefore, there is need in the art to provide a simple, compact, and cost effective unit or assembly that helps in increasing the overall efficiency of the engine as well as reduction in the NOx emission under varying load and speed conditions. In addition, there is also a need of a cooling unit that effectively cools the engine as per the requirement as well as under different load and speed conditions.

OBJECTS OF THE INVENTION
[0021] A general or primary object of the present disclosure is to provide an efficient and economical solution for attenuating the NOx emissions under different load conditions of an engine.
[0022] It is another object of the present disclosure is to provide an uncomplicated and a cost effective unit for attenuating the NOx emissions under different load conditions of an engine.
[0023] It is yet another object of the present disclosure is to provide an uncomplicated and a cost effective unit for attenuating the NOx emissions under different running conditions of an engine.
[0024] It is further object of the present disclosure is to provide a unit for attenuating the NOx emissions.
[0025] It is yet further object of the present disclosure is to provide a unit that attenuates the NOx emissions without decreasing efficiency of an engine and overall efficiency of an agricultural vehicle.
[0026] It is yet another object of the present disclosure is to provide a unit that reduces the complication in the technical configuration of the exhaust gas recirculation unit arises due to the inclusion of the EGR intercooler.
[0027] Another object of the present disclosure is to provide a unit that helps in improving the performance and reliability of the engine as well as the agricultural vehicle.
[0028] These and other objects of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.

SUMMARY
[0029] In accordance with an embodiment, the present disclosure provides a radiator unit for cooling an exhaust gas coming from an exhaust manifold, the radiator unit comprising a radiator core placed at a centre of the radiator unit including cross flow heat exchanger having multiple number of parallel tubes fitted along the length of the radiator unit with fins extending outwards from that tubes in a transverse direction; an upper tank attached at a top of said radiator core, wherein an inlet port is positioned at a centre of the upper tank; a filler neck is provided at a centre of a top of the upper tank , wherein a radiator cap seals a radiator filler neck; and a lower tank attached at a bottom of said radiator core, wherein an outlet port formed at an extreme right of the lower tank ;characterized in that a straight tube heat exchanger fitted along the length of the lower tank, wherein the straight tube heat exchanger includes multiple number of tubes fitted along the length of the radiator unit for carrying and cooling the exhaust gas coming from the exhaust manifold.
[0030] In accordance with an aspect, the number of tubes ranges in between 15-18.
[0031] In accordance with an aspect, the diameter of the tubes of the straight tube heat exchanger made of steel ranges in between 5 mm to 10 mm.
[0032] In accordance with an aspect, a first end of the straight tube heat exchanger is coupled with the inlet pipe carrying the exhaust gas from the exhaust manifold through pipe flange.
[0033] In accordance with an aspect, a second end of the straight tube heat exchanger is coupled with the outlet pipe carrying the exhaust gas to the inlet manifold through pipe flanges.
[0034] In accordance with an aspect, the pipe flanges are joined mechanically with one another via bolts, collars, adhesives or welds.
[0035] In accordance with an aspect, a radiator cowl is configured over the surface of the radiator core facing a radiator fan.
[0036] In accordance with an aspect, a thermostat valve is installed in between the inlet port of the upper tank of the radiator unit and the hose carrying hot water from the engine.
[0037] In accordance with an aspect, an EGR valve is installed in the hose carrying the exhaust gas to the inlet manifold.
[0038] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0039] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0040] FIG.1 illustrates a perspective view of an EGR unit along with an external cooling unit in an engine in accordance with a prior art.
[0041] FIG.2A depicts a rear view of the radiator unit while viewing from the rear of the vehicle in accordance with a prior art.
[0042] FIG.2B depicts a front view of the radiator unit while viewing from the front of the vehicle in accordance with a prior art.
[0043] FIG.3 illustrates the cross-sectional view of an existing exhaust gas recirculation unit in accordance with a prior art.
[0044] FIG.4A depicts a front view of the radiator unit while viewing from the front of the vehicle in accordance with a present disclosure.
[0045] FIG.4B depicts a rear view of the radiator unit while viewing from the rear of the vehicle in accordance with a present disclosure.
[0046] FIG.4C depicts a crossectional view of the lower tank of the radiator unit in accordance with a present disclosure.
[0047] FIG.5A depicts a top view of a straight tube heat exchanger placed in the lower tank of the radiator unit in accordance with a present disclosure.
[0048] FIG.5B depicts a front view of a straight tube heat exchanger placed in the lower tank of the radiator unit in accordance with a present disclosure.
[0049] FIG.6A depicts a connection between a first end of the straight tube heat exchanger placed inside the lower tank of the radiator unit and an inlet pipe carrying the exhaust gases from the exhaust manifold in accordance with the present disclosure.
[0050] FIG.6B depicts a connection between a second end of the straight tube heat exchanger placed inside the lower tank of the radiator unit and an outlet pipe carrying the exhaust gases to the inlet manifold in accordance with the present disclosure.
DETAILED DESCRIPTION
[0051] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such details as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0052] If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0053] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This disclosure may however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those of ordinary skill in the art. Moreover, all statements herein reciting embodiments of the disclosure, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e.,any elements developed that perform the same function, regardless of structure).
[0054] Various terms as used herein. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0055] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0056] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0057] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[0058] Aspects of the present disclosure relates to an efficient and economical radiator unit for attenuating the NOx emissions and cooling the engine under different load and speed conditions of an engine.
[0059] FIG.4A depicts a front view of the radiator unit while viewing from the front of the vehicle in accordance with a present disclosure.
[0060] The radiator unit 200 illustrated in FIG.4A comprising a radiator core 128 placed at a centre of the radiator unit 200 having cross flow heat exchanger including multiple number of parallel tubes 128-T fitted along the length of the radiator unit with fins 128-F extending outwards from that tubes in a transverse direction. The dimensions of the radiator core are defined by the width, height and thickness. The width of the radiator core 128 ranges in between 398 mm to 402 mm. The height of the radiator core 128 ranges in between 449 mm to 451 mm. The thickness of the radiator core 128 ranges in between 55 mm to 57mm. As mentioned above, the radiator core 128 comprises the number of tubes 128-T that ranges in between 38 to 40. The diameter of tubes ranges in between 2 to 3 mm. Moreover, the number of fins 128-F fitted in the radiator core 128 ranges in between 40 to 41.
[0061] FIG.4B depicts a rear view of the radiator unit while viewing from the front of the vehicle in accordance with a present disclosure. It depicts an upper tank 130 attached at a top of said radiator core 128, wherein an inlet port 130-I is positioned at a centre coupled with a hose carrying hot water from an engine shown in FIG.4B. The height of the upper tank 130 ranges in between 71 to 73 mm.
[0062] It also defines a filler neck 130-F that is provided at a centre of a top of the upper tank 130, wherein a radiator cap seals a radiator filler neck 130-F. It further defines a lower tank 202 that is attached at a bottom of said radiator core 128 for retaining the cold water. The height of the lower tank 202 ranges in between 64mm to 66mm.
[0063] An outlet port 202-O is provided at an extreme right of the lower tank 202 coupled with a hose carrying cold water supplied to the engine. In addition, it defines a cowl 134 of circular shape configured over the surface of the radiator core 128 facing a radiator fan.
[0064] The lower tank 202 further includes a straight tube heat exchanger 204 fitted in the middle of the lower tank 202 through press fit mechanism as depicted in FIG.4C. The straight tube heat exchanger 204 includes multiple number of tubes 204-T fitted along the length of the radiatorunit for carrying the exhaust gas coming from the exhaust manifold 104. The multiple number of tubes 204-T of the straight tube heat exchanger placed equidistantly with one another as shown in FIG.5A & 5B.
[0065] FIG.5A depicts a top view & FIG.5B depicts a front view of a straight tube heat exchanger 204 placed in the lower tank 202 of the radiator unit 200 in accordance with a present disclosure. The number of tubes 204-T ranges in between 15-18. The diameter of the tubes 204-T of the straight tube heat exchanger 204 ranges in between 5 mm to 10 mm. The tubes 204-T are made of steel. This straight tube heat exchanger 204 allows the exhaust gas to pass through and cooled by the water present in the lower tank 202.
[0066] The lower tank 202 of the radiator unit 200 comprises a first end 204-F and a second end 204-S, wherein the first end of the straight tube heat exchanger 204 is coupled with the inlet pipe carrying the exhaust gas from the exhaust manifold through pipe flanges as shown in FIG.6A. Moreover, the second end 204-S of the straight tube heat exchanger 204 is coupled with the outlet pipe carrying the exhaust gas to the inlet manifold 120 through pipe flanges. Furthermore, the outlet pipe carrying the exhaust gas to the inlet manifold includes an EGR valve 116 that regulates the amount of exhaust gas entering the inlet manifold 120 as shown in FIG.6B. Here, the pipe flanges are mechanically joined with one another via bolts, collars, adhesives or welds.
[0067] As mentioned above, the lower tank 202 of the defined radiator unit 200 further comprises an outlet port 202-O provided at an extreme right of the lower tank 202 coupled with a hose carrying cold water supplied to the engine for cooling of the engine. In between the outlet port 202-O and the hose carrying cold water supplied to the engine, a pump 122 is installed that creates the forced circulation of water that in turn results in effective cooling of the engine. Furthermore, an upper tank 130 is provided at a top of said radiator core 128, in which an inlet port 130-I is positioned at a centre coupled with a hose carrying hot water from an engine through thermostat assembly.
WORKING MECHANISM
[0068] Here, the straight tube heat exchanger 204 fitted inside the lower tank 202 of the radiator unit 200 comprises multiple number of tubes for reducing the temperature of the exhaust gas that is supplied to the intake manifold. In this manner, the no. of tubes required to reduce the temperature of the exhaust gas are reduced. Hence, the complexity in the technical configuration of the exhaust gas recirculation unit is reduced to great extent.
[0069] Through this placement of the straight tube heat exchanger 204, the defined radiator unit 200 serves two purposes in an efficient manner– the first one is to reduce the temperature of the exhaust gases that can be further mixed with the intake air entering the intake manifold through inlet port, this in turn results in the reduction of NOx emission. The second one is to cool the engine through proper circulation of coolant such as water.
[0070] In all, the proposed technical configuration of the radiator unit increases the overall efficiency of engine as well as the agricultural vehicle.
[0071] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refers to at least one of something selected from the group consisting of A, B, C ….and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
[0072] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the appended claims.
[0073] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE INVENTION
[0074] The present disclosure provides an efficient and economical radiator unit for attenuating the NOx emissions under different load conditions of an engine.
[0075] The present disclosure provides an uncomplicated and a cost effective radiator unit for attenuating the NOx emissions under different load conditions of an engine.
[0076] The present disclosure provides an uncomplicated and a cost effective radiator unit for attenuating the NOx emissions under different running conditions of an engine.
[0077] The present disclosure provides a radiator unit for attenuating the NOx emissions and also helps in increasing the cooling efficiency of the radiator unit.
[0078] The present disclosure provides a radiator unit that attenuates the NOx emissions without decreasing efficiency of an engine and overall efficiency of an agricultural vehicle.
[0079] The present disclosure provides a radiator unit that reduces the complication in the technical configuration of the exhaust gas recirculation unit arises due to the inclusion of the EGR intercooler.
[0080] The present disclosure provides a radiator unit that helps in improving the performance and reliability of the engine as well as the agricultural vehicle.

, Claims:WE CLAIM:
1. A radiator unit (200) for cooling an exhaust gas coming from an exhaust manifold (104), the radiator unit (200) comprising
a radiator core (128) placed at a centre of the radiator unit (200) including multiple number of parallel tubes (128-T) fitted along the length of the radiator unit with fins (128-F) extending outwards from that tubes in a transverse direction;
an upper tank (130) attached at a top of said radiator core (128), wherein an inlet port (130-I) is positioned at a centre of the upper tank;
a filler neck (130-F) provided at a centre of a top of the upper tank (130), wherein a radiator cap seals a radiator filler neck (130-F); and
a lower tank (202) attached at a bottom of said radiator core (128), wherein an outlet port (202-O) formed at an extreme right of the lower tank (202);
characterized in that a straight tube heat exchanger (204) fitted along the length of the lower tank (202), wherein the straight tube heat exchanger (204) including multiple number of tubes (204-T) fitted along the length of the radiator unit for carrying and cooling the exhaust gas coming from the exhaust manifold (104).
2. The radiator unit (200) as claimed in claim 1, wherein the straight tube heat exchanger (204) fitted inside the lower tank (202) through press fit mechanism.
3. The radiator unit (200) as claimed in claim 1, wherein the multiple number of tubes (204-T) placed equidistantly with one another inside the straight tube heat exchanger (204).
4. The radiator unit (200) as claimed in claim 1, wherein the number of tubes (204-T) ranges in between 15-18.
5. The radiator unit (200) as claimed in claim 1, wherein the diameter of the tubes (204-T) of the straight tube heat exchanger (204) made of steel ranges in between 5 mm to 10 mm.
6. The radiator unit (200) as claimed in claim 1, wherein a first end (204-F) of the straight tube heat exchanger (204) is coupled with the hose carrying the exhaust gas from the exhaust manifold through pipe flanges (206-F).
7. The radiator unit (200) as claimed in claim 1, wherein a second end (204-S) of the straight tube heat exchanger (204) is coupled with the inlet pipe carrying the exhaust gas to the inlet manifold through pipe flanges (206-S).
8. The radiator unit (200) as claimed in claim 6 and 7, wherein the pipe flanges (206-S, 206-F) are mechanically joined with one another via bolts, collars, adhesives or welds.
9. The radiator unit (200) as claimed in claim 1, wherein a radiator cowl (134) is configured over the surface of the radiator core (128) facing a radiator fan.
10. The radiator unit (200) as claimed in claim 1, wherein a thermostat valve is installed in between the inlet port (130-I) of the upper tank (130) of the radiator unit and the hose carrying hot water from the engine.
Dated this 2nd Day of March 2023