FORM 2
THE PATENT ACT, 1970,
(39 OF 1970)
&
THE PATENTS RULE, 2003
COMPLETE SPECIFICATION
(SEE SECTION 10; RULE 13)
"INTEGRATED HOT WATER DISPENSER AND HOT BOX CHAMBER IN A
VEHICLE"
MAHINDRA & MAHINDRA LIMITED A COMPANY REGISTERED UNDER PROVISIONS OF COMPANIES ACT, 1956 HAVING ADDRESS AT R & D CENTER, AUTOMOTIVE SECTOR, 89, M.I.D.C., SATPUR, NASHIK-422 007, MAHARASHTRA, INDIA
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THE INVENTION AND MANNER IN WHICH IT IS TO BE PERFORMED

FIELD OF INVENTION:-
The present invention relates to the field of exhaust heat recovery in
automobiles. More particularly the present invention relates to the field of
exhaust heat recovery for use in hot water dispensing and food warming in automobiles.
BACKGROUND OF THE PRESENT INVENTION:-
The number of automobile users has drastically increased over the last decade. Due to this, people started using car effectively. Many people consider their car as the second home. As the expectation of the people increases, the technology aid additional features needs to be incorporated into the car. People always prefer to have their food in hot irrespective of the weather condition. Various attempts have been made to provide hot water and to keep

the food warm in automobiles.
The heat recovery from the exhaust gas has so far been done in a variety of ways. The most common and earliest design incorporates a heat exchanger unit which drastically impact the system back pressure. This is because the exhaust gas flow is being diverted or intruded. For instance, in the publication WO 2007/102170 A2, the flow is diverted and controlled by hot fuel gas regulator. In other United States patent US 6672301 B2, the design involves a customized pipe routing in which exhaust fumes are supplied to the heat exchanger.
In another prior art document US 5582095, the exhaust gas is made to uniformly pass through multiple tubes by which heat transfer takes place by radiation into the inner chamber in a two wheeler vehicle. The patent reference US 4593753 discloses a separate baffle or deflector plate is arranged in the inner tube adjacent each of the exhaust pipes. The purpose of the deflector plates is to cause the exhaust gases entering the tube to move in a generally helical path along the tubes towards connecting means for the secondary exhaust pipe. This will cause increase in back pressure.

In the patent reference US 1861672, a hot plate having a marginal depending rim, a base fitting lower edge of the rim of the hot plate and providing a chamber with the rim, a cruciform shaped perforated hot gas diffuser located centrally of the chamber and receiving in its enclosure and centrally the hot gases for heating the hot plate, exhaust ports being formed at the ends of the base externally of the diffuser, whereby gases escaping through the ports of the diffuser may vent through these ports 3,5-15. The patent US 1510054 discloses a deflector plate serves to direct the hot gases upwardly against the top of the box.
Another way of heat recovery from exhaust system is by coupling with engine cooling system The patent reference US 6164553 uses this method to supplement interior heating of large vehicles such as school bus during cold because the heat extracted from the engine can be unsatisfactory as the engine takes time to warm up and, even after the engine has warmed up, insufficient heat is produced by the engine. In another patent US 3148675, a copper tube is wrapped around the exhaust manifold to recover heat. This will have direct impact on the performance of the catalytic converter and hence emission targets may not be possible to meet because the temperature of the gas will reduce due to the heat transfer. Due to this shortcoming, adaptability is not feasible for this design.
Other prior art liquid dispensers heat the liquid with gases from the engine exhaust manifold. This is a difficult source of heat to deal with and the gas-liquid heat exchanger creates many problems due to the high temperature differential involved and the toxicity of the gases.
To address these drawbacks of the conventional exhaust heat recovery systems, there is a need in the art to provide a system which recovers the exhaust heat without having any adverse effects on the performance of other components and also easy to install in the existing vehicles.

OBJECTS OF/THE PRESENT INVENTION:-
An object of the present invention is to provide a simple and cost effective system to maintain the temperature of the food and to provide hot drinking water supply unit in a combustion engine based vehicle wherein the source of heat is from the exhaust gases of the vehicle.
Another object of the present invention is to provide a non-intrusive heat recovery unit from exhaust system wherein the heat recovery unit produce hot water and provide heating simultaneously without producing extra back pressure.
Another object of the present invention is to provide a dual function box chamber in automobiles which functions in hot and cold mode.
STATEMENT OF INVENTION:-
Accordingly the invention provides an integrated hot water dispenser and hot box chamber in a vehicle comprises a primary heat exchanger mounted on the vehicle exhaust pipe having an inlet pipe connected to a first cup at bottom; an out let pipe through a pump from said heat exchanger leading to a second cup for collecting hot water; a dual mode box chamber having a secondary heat exchanger inlet connected with an inlet hose to the said outlet pipe with T-joint connector and outlet connected with outlet hose to the said inlet pipe with T- joint connector; a cooler bin house provided in the said dual mode box at the bottom connected to air conditioner system; a selector switch means to keep active the said heat exchanger or cooler bin house.
BRIEF DESCRIPTION OF THE FIGURES:-
Other objects and advantages of this invention will become apparent from the following description, taken in connection with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of this invention.

The drawings' constitute a part of this specification and include exemplary embodiments of the present invention and illustrate various objects and features thereof;
Figure 1 illustrates the schematic view of the automobile exhaust heat recovery system with the dual mode box chamber, heat exchanger and the hot water pump of the present invention;
Figure 2 illustrates the perspective view of hot water dispensing cup with the hot box chamber of the automobile exhaust heat recovery system of the present invention;
Figure 3 illustrates the perspective view of unit control knob of the automobile exhaust heat recovery system;
DETAILED DESCRIPTION OF THE PRESENT INVENTION:-

The foregoing objects of the invention are accomplished and the problems and shortcomings associated with the prior art techniques and approaches are overcome by the present invention as described below in the preferred embodiment.
The present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in bracket in the following description.
The automobile exhaust heat recovery system of the present invention consists of the following components:
• Primary Heat Exchanger (1)
• Connectors (13)

• Hot Water Pump(3)
• Hot Water Supply Tap (4)
• Water Control Valve (5)
• Dual mode box Water Inlet Hose (8)
• Dual mode box Water Outlet Hose (9)
• Gap between hot box inner wall and outer wall (10)
• Normal Water Inlet Cup (7)
• Hot Water Outlet Cup (6)
• Hot Box Chamber (14)
• Exhaust Pipe (2)
• Cooler Bin Hose (12)
According to figure 1 of the present invention, the primary heat exchanger (1) is welded concentrically to the exhaust pipe (2) forming a double pipe heat exchanger. The inlet side of the primary heat exchanger (1) is connected to the Normal Wate" Cup (7) (Normal Water Inlet) and the outlet side of the primary heat exchanger (1) is connected to the Hot Water Cup (5) (Hot Water Outlet) and the secondary heat exchanger (14) through a T junction connector (13) via Hot Water Pump (3). The Primary Heat Exchanger is located in the Intermediate pipe closer to the Engine. The secondary heat exchanger (14) is called Dual mode box chamber. The dual mode box chamber (14) is also connected to the Cooler Bin Hose (12) which in turn is connected to the Air Conditioner System (11). Upon switching off the Hot Water Pump (3) by means of a selector switch, the dual mode box chamber (14) can be used as Cold Box by directing the ac air towards the chamber. Therefore, the dual mode box chamber can function in two modes: Hot mode and Cold mode.
The location of hot water inlet at the top and hot water outlet at the bottom is the best location for the dual function of the Chamber for Hot and Cold mode. This is because in the Cold Mode and during purging mode, the water in the system has to be removed. Therefore, hot water outlet at the bottom of the chamber serves the purpose. There will be accumulation of Hot water in the annulus of Hot Chamber for heating the Hot Box because firstly, the system is

a closed system. Secondly, the capacity (Volume) of the Primary Heat Exchanger and the annular volume in the Box Chamber is a known quantity. Accordingly, the required amount of water will be poured into the cold water inlet. Any amount of water that is taken out of the system through the Hot Water Outlet will be compensated at the Cold Water Inlet.
HOT MODE
In Hot Mode, the flow of cold air through the Cooler Bin Hose (12) is cut off through the Cooler Bin Hose flow control inside the Hot or Cold Mode Selector Unit. A known quantity of Cold water is poured into the Cold Water Inlet (7). The Cold Water flows to the Primary Heat Exchanger (1) by means of gravitational pull. The Cold Water gets heated from the exhaust gas through Conduction and Convection. The heated water flow from the Primary Heat Exchanger (1) to the dual mode box chamber (14) and the Hot Water Outlet on demand through the Hot Water Pump (3) is controlled by means of a Hot Water Pump Control inside the Hot or Cold Mode Selector Switch.
COLD MODE

In Cold Mode, the Hot Water Pump (3) is switched off through the Hot Water Pump (3) which is controlled via Hot Water Pump Control inside the Hot or Cold Mode Selector Unit. A part of the cold air from the existing air conditioning system (11) is directed towards the Hot Box Chamber (14) via the cooler bin hose (12). This keeps the chamber cold.
PURGING
Any quantity of water that may remain in the Primary Heat Exchanger is purged by the action of Hot Water Pump (3).
Referring to Figure 2 of the present invention, the selector switch (19) for activating the. hot mode or cold mode is placed over the gear leaver of the console. The normal water inlet cup (16) is placed over the console along with

the portable hot water cup (15) and the hot box chamber (18). The water control valve (17) is positioned at the hot water outlet hose for controlling the hot water flow from hot water pump (not shown).
Referring to Figure 3 of the present invention, it shows the clear view of the selector switch (20) for selection of three different modes of the system namely hot mode (H), Cold Mode (C) and Purge Mode (P).
TYPES OF MATERIALS USED FOR EACH COMPONENT
• Primary Heat Exchanger - SUS 309
• Connectors-SUS 309
• Hot Water Pump - SUS 309
• Cold Water Cup - SUS 309
• Hot Water Cup - SUS 309
• Hot/Cold Box Inner Chamber - Aluminized SUS 409
• Hot/Cold Box Outer Chamber - SUS 309
• Exhau'.t Pipe -Aluminized SUS 409
It should be understood that the hot box chamber can be placed anywhere within the passenger compartment by extending/shortening the heat recovery piping system. It should also be understood that the heat recovery system can be set up in any type of vehicles which is powered by engines which exhales hot exhaust gases.
The technical advantages achieved by the present invention are:
- Implementation of the system is possible in the existing vehicles as it requires no or less modification of surrounding systems.
- The system can be easily integrated with any of the existing cup holders in automobiles.
- Heat recovery from exhaust system without using engine coolant which can cause unhygienic contamination to hot water.
- Heat recovery from exhaust system without using electrical source.

- Heat recovery from exhaust system without increasing exhaust system back pressure and no effect on engine performance.
- The chamber is designed as a portable box chamber.
It should be understood that the present invention is not to be limited by the exact details of the illustrated embodiment. However, it is to be taken as the preferred example of the invention and that various changes may be resorted to by a person skilled in the art without departing from the spirit of the invention. Also, the terminologies used herein are for the purpose of description and should not be regarded as limiting.

WE CLAIM:-
1. An integrated hot water dispenser and hot box chamber in a vehicle comprises a primary heat exchanger, mounted on the vehicle exhaust pipe having an inlet pipe connected to a first cup at bottom; an out let pipe through a pump from said heat exchanger leading to a second cup for collecting hot water; a dual mode box chamber having a secondary heat exchanger inlet connected with an inlet hose to the said outlet pipe with T-joint connector and outlet connected with outlet hose to the said inlet pipe with T- joint connector; a cooler bin house provided in the said dual mode box at the bottom connected to air conditioner system; a selector switch means to keep active the said heat exchanger or cooler bin house.
2. The integrated hot water dispenser and hot box chamber as claimed in the claim 1 wherein the said primary heat exchanger is mounted on exhaust pipe near to engine.
3. The integrated hot water dispenser and hot box chamber as claimed in claims 1 and 2 wherein the said secondary heat exchanger hot water inlet is upper side and hot water outlet is lower side.
4. The integrated hot water dispenser and hot box chamber as claimed in claims 1 to 3 wherein the selector switch provided with feature to keep in hot mode by switching off cold air to cooler bin house and start the said pump for allowing flow of hot water through secondary heat exchanger or cold mode by switching of hot water pump and switching on cold air to cooler bin house or purging by the action of the said pump.