FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003 PROVISIONAL / COMPLETE SPECIFICATION (See section 10 and rule 13)
PROVISIONAL
The following specification describes the invention.
1. TITLE OF THE INVENTION
"Converging nozzle in the top tank of a fin-tube heat exchanger"
2. APPLICANT
(a) NAME : TATA TOYO Radiator Ltd
(b) NATIONALITY : Indian Company registered under the provisions of the
Companies Act, 1956
(c) ADDRESS : Survey No. 235/245, Village Hinjewadi, Taluka
Mulshi, Dist. Pune 411 027, M.S. India
3. PRREAMBLE TO THE DESCRIPTION
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.





Field of the invention:
The present invention relates to a two-pass fin-tube heat exchanger core, more particularly, the present invention relates a top tank of a two-pass fm-tube heat exchanger capable of controlling the fluid pressure drop therein.
Background and Prior Art:
The existing heat exchangers, such as heater core or radiator and the like having fin- tube type (cross flow or down flow) with two-pass configuration, such as inlet and outlet on the same tank of the heat exchanger are observed in automotive passenger car. This kind of heat exchanger is giving more coolant pressure drop during operation due to 2-pass construction. As the coolant pressure drop is the major factor is deciding the engine cooling system coolant pump. It is not desirable to have excessive coolant pressure drop across radiator. In previous constructions, there is no solution which will give the less coolant pressure drop without much affecting the performance especially for 2-pass radiator. Due to this coolant pressure drop constraint the radiator size is getting higher than the actual heat transfer requirement. There is no such solution with smaller radiator size which will give the same heat rejection with less pressure drop in 2-pass construction.
Drawbacks in Prior Art:
1. The existing heater core or radiator or any similar heat exchanger of fm-tube type (cross flow or down flow) with two-pass configuration (that is inlet and outlet sides on the same tank of the heat exchanger) encounters a problem of higher pressure drop across heat exchanger.
2. Excess pressure drop in the coolant flow will result in
i. higher water pump power consumption
ii. Reduction in inner fluid flow resulting in reduced heat exchange performance



iii. Possibility of cavitation and early failure of pump and or the heater exchanger core tubes
Object of Invention:
The object of the present invention is to provide a heat exchanger to overcome the drawback mentioned above by reducing the fluid pressure drop flowing through the tubes.
Another object of present invention is to provide a heat exchanger capable of reducing the auxiliary piping arrangement that may be necessary to by-pass the excess fluid flow to control the pressure drop.
Summary of the present invention:
The present invention provides a heat exchanger which includes a top tank and a bottom tank. The top tank includes a partition member capable of separating the top tank into, an inlet tank and an outlet tank. The heat exchanger includes an inlet pipe disposed on the inlet top tank, the inlet pipes supplies coolant into the heat exchanger, and an outlet pipe disposed on the outlet top tank egresses coolant out of the heat exchanger. The improvement comprises a conversing nozzle configured on the partition member. The conversing nozzle is capable of bypassing some amount of inlet coolant from the inlet tank to the outlet tank, thereby reducing the pressure drop across tubes of the heat exchanger for enhancing thermal performance of the heat exchanger.
Statement of the present invention:
According to present invention there is provided a heat exchanger having a top tank and a bottom tank, the top tank having an partition member capable of separating the top tank into, an inlet tank and an outlet tank, a inlet pipe disposed on the inlet top tank, the inlet pipes supplies coolant into the heat exchanger, and an outlet pipe disposed on the outlet top tank egresses coolant out of the heat exchanger.
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9 SEP 2009

characterised in that: a conversing nozzle is contigured on the partition nozzle, the conversing nozzle capable of bypassing some amount of inlet coolant from the inlet tank to the outlet tank, thereby reducing the pressure drop in tubes of the heat exchanger for enhancing thermal performance of the heat exchanger.
Brief description of Figures
Fig. 1 shows schematic diagram of an improved heat exchanger of the present invention;
Fig. 2 shows detail schematic of converging nozzle arrangement according to present invention in the heat exchanger top tank.
Detailed Description of Invention:
The foregoing objects of the invention are accomplished and the problems and shortcomings associated with prior art techniques and approaches are overcome by the present invention as described below in the preferred embodiment. This invention is illustrated in the accompanying drawings, through out which like reference letters indicate corresponding parts in the various figures. Referring now to fig. 1 and fig. 2 shows a various views of heat exchanger (100). For example, the heat exchanger (100) is a radiator. The heat exchanger (100) includes a top tank (10) and a bottom tank (7). The top tank (10) having an partition member (9) capable of separating the top tank into, an inlet tank and an outlet tank, a inlet pipe disposed on the inlet top tank, the inlet pipes supplies coolant into the heat exchanger, and an outlet pipe disposed on the outlet top tank egresses coolant out of the heat exchanger.
The improvement includes: a conversing nozzle (9a) is configured on the partition. The conversing nozzle (9a) is capable of bypassing some amount of inlet coolant from the inlet tank (2a) to the outlet tank (2b), thereby reducing the pressure drop in tubes of the heat exchanger (100) for enhancing thermal performance of the heat exchanger (100).
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Referring now to figure 2, detail schematic of converging nozzle (9a) arrangement according to present invention in the heat exchanger (100) top tank (2). The converging nozzle (9a) as shown in Fig. 2 is introduced for the fin tube heat exchanger (100), such as radiator heater core top tank (2a and 2b) for a two pass heat exchanger core (6) arrangement, to by-pass the coolant in the fin-tube heat exchanger top tank. By reducing the coolant flow in the heat exchanger tubes (5), the necessary coolant pressure drop target could be achieved, ensuring that thermal performance requirements are met.
The flow to be discharged from the conversing nozzle (9a) is decided based on the targeted pressure drop by appropriately reducing the flow through the heat exchanger (6); Bernoulli's theorem is applied at the inlet (2a) and outlet section (2b) of the convergent nozzle (9a) assuming that the pressure head across the two sides of the nozzle is same as the pressure drop in the fluid through the two pass heat exchanger core (6).
Advantages of Present Invention:
1. Coolant pumping power will reduce.
2. Prevent the cavitation phenomenon inside the heat exchanger and cooling system and reduce the early failure occurrence.
3. Reduce the core weight by reducing the heat exchanger core thickness that is limited because of excessive coolant side pressure drop for same achievable heat performance.



M.D. Bhate (Agent for Applicant)
We Claim:
1. A 2-pass or U-pass heat exchanger having a top tank and a bottom tank, the top tank having a partition member capable of separating the top tank into, an inlet tank and an outlet tank, a inlet pipe disposed on the inlet top tank, the inlet pipes supplies coolant into the heat exchanger, and an outlet pipe disposed on the outlet top tank egresses coolant out of the heat exchanger, characterised in that: a conversing nozzle is configured on the partition member, the conversing nozzle capable of bypassing some amount of inlet coolant from the inlet tank to the outlet tank, thereby reducing the pressure drop in tubes of the heat exchanger for enhancing thermal performance of the heat exchanger.
2. The heat exchanger of claiml, substantially as described with reference to the drawings.
Dated this 29th August 2009
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9 SEP 2009