FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL
Specification
(See section 10 and rule 13)
THERMOSIPHON SYSTEM THERMAX LIMITED
an Indian Company
Chinchwad, Pune 411019, Maharashtra, India
THE FOLLOWING SPECIFICATION DESCRIBES THE INVENTION.
l

FIELD OF INVENTION:
This invention relates to a New Thermosiphon system.
PRIOR ART:
It is already known in the prior art that Thermosiphon systems which are powered by oil/gas fired burners and that all these Thermosiphon systems are vertical with the burner mounted on top with vertically downward firing.
DRAWBACKS OF THE PRIOR ART:
It is known that in any Thermosiphon system the user point location has to be above the Thermosiphon units. Hence, the Thermosiphon can be used only for utilities that are at very high elevation. With an increase in the unit size the minimum elevation requirement of the user point also increases.
In particular, this invention envisages an oil/gas fired Thermosiphon system, which is purely horizontal.
OBJECT OF THE INVENTION:
An object of this invention is to provide a Thermosiphon in which the elevation requirement does not appreciably increase with an increase in the unit size or capacity.
SUMMARY OF THE INVENTION:
According to this invention there is provided a Thermosiphon unit comprising a horizontal helical coil, forming the furnace either of a straight flue or of a reverse flue design, a supply header at the bottom and

a collection header at the top and these headers are connected to the coil by means of stubs to each turn of the coil.
Typically, the helical coil is horizontal with either a single or concentric multi-coils.
Typically, the Thermosiphon is with or without an integral heat recovery unit be it air pre-heater or any other.
Typically, the horizontal Thermosiphon unit comprises a means for burning fuel like FO, LDO, HSD, and Natural Gas.
BRIEF DESCRIPTION OF THE DRAWING:
The invention will be described in detail with reference to a preferred
embodiment. Reference to this embodiment does not limit the scope of
the invention.
In the accompanying drawing:
Figure 1 illustrates the proposed system wherein (1) is the Furnace or
combustion chamber along the axis of which from one end fuel is fired by
any known means and the air is supplied either by blower/blowers (forced
/ balance draft). The furnace design can either be of straight flue or
reverse flue type. In the straight flue type the products of combustion exit
from the rear end of the furnace and in the reverse flue type the products
of combustion exit from the front end of the furnace.
The Furnace or combustion chamber is made of tubes, helically wound. Each turn of the helical coil is then drilled at top and at the bottom, and connected to the headers (2) and (3) by means of stub (5). The heated media (steam / water) outlet is taken either from the top header (3)

directly or through an additional header (4). The heated media is then circulated to the user point (6), either single or multi-user points, by natural circulation. The top headers (3) and (4) are connected to the bottom header (2) by means of down comers (7).
The products of combustion exit the furnace, and enter the annular space between the helical coil and a jacket (8) made of steel, which forms the convection bank. In the convection bank the products of combustion exchange heat with heated media in the coil. In some cases where inner jacket air cooling is provided, the products of combustion exchange heat with both the heated media in the coil and with the cooling air flowing through the annular between the inner jacket and a second outer jacket (9). The heated air in such cases is used as combustion air.
ADVANTAGES OF THE NEW INVENTION:
Many utilities at lower elevation can be powered by 'Horizontal Thermo-syphon’, which offers the following advantages to the customer.
Ø Higher overall efficiency
Ø No continuous water requirement - a great advantage to users in drought areas
Ø No water treatment is required and hence the associated cost saving
Ø No product contamination since the heating media is non-toxic water
While considerable emphasis has been placed herein on the specific structure of the preferred embodiment, it will be appreciated that many alterations can be made and that many modifications can be made in the preferred embodiment without departing from the principles of the invention. These and other changes in the preferred embodiment as well

as other embodiments of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

Dated this 7th day of April 2006

Mohan Dewan
of R. K. Dewan & Co
Applicant’s Patent Attorney

FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL
Specification
(See section 10 and rule 13)
THERMOSIPHON SYSTEM THERMAX LIMITED
an Indian Company
Chinchwad, Pune 411019, Maharashtra, India
THE FOLLOWING SPECIFICATION DESCRIBES THE INVENTION.
l

FIELD OF INVENTION:
This invention relates to a New Thermosiphon system.
PRIOR ART:
It is already known in the prior art that Thermosiphon systems which are powered by oil/gas fired burners and that all these Thermosiphon systems are vertical with the burner mounted on top with vertically downward firing.
DRAWBACKS OF THE PRIOR ART:
It is known that in any Thermosiphon system the user point location has to be above the Thermosiphon units. Hence, the Thermosiphon can be used only for utilities that are at very high elevation. With an increase in the unit size the minimum elevation requirement of the user point also increases.
In particular, this invention envisages an oil/gas fired Thermosiphon system, which is purely horizontal.
OBJECT OF THE INVENTION:
An object of this invention is to provide a Thermosiphon in which the elevation requirement does not appreciably increase with an increase in the unit size or capacity.
SUMMARY OF THE INVENTION:
According to this invention there is provided a Thermosiphon unit comprising a horizontal helical coil, forming the furnace either of a straight flue or of a reverse flue design, a supply header at the bottom and

a collection header at the top and these headers are connected to the coil by means of stubs to each turn of the coil.
Typically, the helical coil is horizontal with either a single or concentric multi-coils.
Typically, the Thermosiphon is with or without an integral heat recovery unit be it air pre-heater or any other.
Typically, the horizontal Thermosiphon unit comprises a means for burning fuel like FO, LDO, HSD, and Natural Gas.
BRIEF DESCRIPTION OF THE DRAWING:
The invention will be described in detail with reference to a preferred
embodiment. Reference to this embodiment does not limit the scope of
the invention.
In the accompanying drawing:
Figure 1 illustrates the proposed system wherein (1) is the Furnace or
combustion chamber along the axis of which from one end fuel is fired by
any known means and the air is supplied either by blower/blowers (forced
/ balance draft). The furnace design can either be of straight flue or
reverse flue type. In the straight flue type the products of combustion exit
from the rear end of the furnace and in the reverse flue type the products
of combustion exit from the front end of the furnace.
The Furnace or combustion chamber is made of tubes, helically wound. Each turn of the helical coil is then drilled at top and at the bottom, and connected to the headers (2) and (3) by means of stub (5). The heated media (steam / water) outlet is taken either from the top header (3)

directly or through an additional header (4). The heated media is then circulated to the user point (6), either single or multi-user points, by natural circulation. The top headers (3) and (4) are connected to the bottom header (2) by means of down comers (7).
The products of combustion exit the furnace, and enter the annular space between the helical coil and a jacket (8) made of steel, which forms the convection bank. In the convection bank the products of combustion exchange heat with heated media in the coil. In some cases where inner jacket air cooling is provided, the products of combustion exchange heat with both the heated media in the coil and with the cooling air flowing through the annular between the inner jacket and a second outer jacket (9). The heated air in such cases is used as combustion air.
ADVANTAGES OF THE NEW INVENTION:
Many utilities at lower elevation can be powered by 'Horizontal Thermo-syphon’, which offers the following advantages to the customer.
Ø Higher overall efficiency
Ø No continuous water requirement - a great advantage to users in drought areas
Ø No water treatment is required and hence the associated cost saving
Ø No product contamination since the heating media is non-toxic water
While considerable emphasis has been placed herein on the specific structure of the preferred embodiment, it will be appreciated that many alterations can be made and that many modifications can be made in the preferred embodiment without departing from the principles of the invention. These and other changes in the preferred embodiment as well

as other embodiments of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

Dated this 7th day of April 2006

Mohan Dewan
of R. K. Dewan & Co
Applicant’s Patent Attorney