ZA201002154B - Heat exchanger - Google Patents
Heat exchanger Download PDFInfo
- Publication number
- ZA201002154B ZA201002154B ZA2010/02154A ZA201002154A ZA201002154B ZA 201002154 B ZA201002154 B ZA 201002154B ZA 2010/02154 A ZA2010/02154 A ZA 2010/02154A ZA 201002154 A ZA201002154 A ZA 201002154A ZA 201002154 B ZA201002154 B ZA 201002154B
- Authority
- ZA
- South Africa
- Prior art keywords
- heat exchanger
- water heater
- domestic water
- heating
- liquid
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 67
- 239000007788 liquid Substances 0.000 claims description 50
- 238000010438 heat treatment Methods 0.000 claims description 38
- 238000009434 installation Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 8
- 239000008236 heating water Substances 0.000 claims description 6
- 238000009428 plumbing Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000009420 retrofitting Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Heat-Pump Type And Storage Water Heaters (AREA)
Description
® 2
HEAT EXCHANGER
This invention relates to solar heating. In particular, the invention relates to a heat exchanger for a domestic water heater, to a domestic water heater, to a solar heating installation and to a method of heating water.
The inventor is aware of domestic solar heating systems that incorporate solar collectors and insulated water storage tanks. However, it has been found that these systems cannot be retrofitted on existing conventional water heater installations, but normally replace such installations. In order to reduce the cost of retrofitting solar water heating systems to existing installations, the invention aims to incorporate existing conventional water heater storage tanks in the solar water heating system.
According to one aspect of the invention, there is provided a heat exchanger, which includes an elongate, closed body of a conductive material; attachment means on the closed body, shaped and dimensioned sealingly to attach to an opening into a domestic water heater storage tank to dispose a substantial portion of the elongate closed body into the water heater storage tank; a circulation arrangement, forming part of the closed body, the circulation arrangement having a liquid inlet and a liquid outlet to circulate liquid inside the closed body.
® 3
The elongate closed body may be tubular. In particular, the elongate closed body may be circular cylindrical.
The elongate closed body may have a length matched to the length of a domestic water heater storage tank, when mounted to a domestic water heater to extend a substantial portion into an inside of the domestic water : heater.
The attachment means may be in the form of a flange around an outside circumference of the cylindrical body.
The flange may include circumferentially extending mounting apertures matched to mounting apertures around the opening into the domestic water heater storage tank.
Any one of the liquid inlet and liquid outlet may open into one side of the elongate cylindrical body and the other one of the liquid inlet and the liquid outlet may open into another side of the elongate cylindrical body to define a liquid flow path inside the circular cylindrical body.
According to another aspect of the invention, there is provided a domestic water heater, which includes a heat exchanger as described, in which the inside of the heat exchanger defines a primary heating chamber inside the elongate closed body, the primary heating chamber having a liquid inlet for receiving heated water from a solar collector and a liquid outlet for returning water to a solar collector; and a domestic water heater storage tank to which is mounted the heat exchanger, the inside of the domestic water heater, outside the body of the heat exchanger defining a secondary heating chamber, the domestic water heater having the conventional liquid inlet from a water supply and a liquid outlet to a domestic plumbing installation.
® 4
According to yet another aspect of the invention, there is provided a solar heating installation, which includes a domestic water heater as described; a solar collector in flow communication with the liquid inlet and the liquid outlet of the primary heating chamber of the heat exchanger, for heating liquid inside the heat exchanger; and circulation means for circulating heating liquid from the solar collector to the heat exchanger.
In one embodiment, the circulation means may be in the form of a gravity fed installation. In another embodiment, the circulation means may be in the form of a pump operable to pump a heating liquid between the solar collector and the heat exchanger.
The invention extends to a method of heating water in a domestic water heating installation, the method including circulating a heating liquid from a solar collector to a heat exchanger as claimed in claim 1 disposed inside a domestic water heater; and retaining water to be heated inside a domestic water heater for disposal from the water heater.
The invention will now be described, by way of example only with reference to the following drawing(s):
DRAWING(S)
In the drawing(s):
Figure 1 shows a heat exchanger in accordance with one aspect of the invention installed in a domestic water heater in accordance with another aspect of the invention; and
® 5
Figure 2 shows a solar heating installation in accordance with the invention.
In Figure 1, a domestic water heater 10 includes a heat exchanger 12 mounted onto a domestic water heater storage tank 18. The heat exchanger 12 includes an elongate closed round tubular body 14 of mild steel that defines a primary heating chamber. It is to be appreciated that the body 14 may be made of any another conductive material such as Stainless steel, or the like.
The heat exchanger 12 is provided with a flange 16 extending circumferentially around the body 14 with circumferentially extending apertures and fastening bolts 20 in the flange 16 matched to mounting apertures in the storage tank 18.
As can be seen, the heat exchanger 12 extends into an inside of the storage tank 18.
The cylindrical body 14 includes a liquid inlet 22 for feeding liquid into an inside of the body 14 and a liquid outlet 24 for discharging liquid from the inside of the body 14. The liquid inlet 22 leads into the body 14 of the heat exchanger 12 with an end 22.1 opening proximate an operative inner end 14.1 of the body 14. The liquid outlet 24 leads from the body 14, with an intake 24.1 proximate an operative outer end 14.2 of the body. The liquid inlet 22 and the liquid outlet 24 define a circulation arrangement for circulating heated liquid inside the body 14 of the heat exchanger 12.
It is to be appreciated that various models of heat exchangers may be provided suited to the dimensions of domestic water heater storage ! tanks.
The domestic water heater storage tank 18 is provided with a standard water inlet 26 and a standard water outlet 28 for feeding a supply of
® 6 water via the inlet 26 into the storage tank 18 and for supplying heated water via the outlet 28 to a domestic plumbing installation.
In Figure 2 a solar heating installation 50 is shown in accordance with the invention. The solar heating installation 50 includes a domestic water heater 10 as described and a solar collector 52 connected to the liquid inlet 22 and liquid outlet 24 of the heat exchanger 12. A circulation pump 54 may be supplied in line between the solar collector 52 and the heat exchanger 12 to aid circulation of a heating fluid between the collector 52 and the heater 10. In certain installations where the solar collector is installed at an angle to promote circulation of hot water from the solar collector 52 to the heat exchanger 12 under force of gravity, the circulation pump may not be necessary. The circulation pump may have a controller (not shown) that is operable to be activated only when the solar collector 52 temperature is higher than the heat exchanger temperature.
The water heater has the standard liquid inlet 26 and liquid outlet 28, which is connectable to a plumbing installation.
In operation, there is provided a method of heating water in a domestic water heating installation 50, by circulating a heating liquid from a solar collector 52 to a heat exchanger 12 disposed inside a domestic water heater storage tank 18, thereby to heat water in the storage tank 18 by means of propagation of the heat from the walls of the heat exchanger into water stored in the storage tank 18.
The inventor believes that the invention, as illustrated provides a new heat exchanger, a new domestic water heater and a new domestic water heater installation, which may be of particular use in applications where the cost of retrofitting an existing water heating installation with solar heater installation may be of importance. It is further believed that this invention would reduce the energy consumption of the water heating requirements substantially.
Claims (17)
1. A heat exchanger, which includes an elongate, closed body of a conductive material, attachment means on the closed body, shaped and dimensioned sealingly to attach to an opening into a domestic water heater storage tank to dispose a substantial portion of the elongate closed body into the water heater storage tank; a circulation arrangement, forming part of the closed body, the circulation arrangement having a liquid inlet and a liquid outlet to circulate liquid inside the closed body.
2. A heat exchanger as claimed in claim 1, in which the elongate closed body is tubular.
3. A heat exchanger as claimed in claim 2, in which the elongate closed body is circular cylindrical.
4. A heat exchanger as claimed in claim 1, in which the elongate closed body has a length matched to the length of a domestic water heater storage tank, when mounted to a domestic water heater to extend a substantial portion into an inside of the domestic water heater.
5. A heat exchanger as claimed in claim 1, in which the attachment means is in the form of a flange around an outside circumference of the cylindrical body.
6. A heat exchanger as claimed in claim 5, in which the flange includes circumferentially extending mounting apertures matched to mounting apertures around the opening into the domestic water heater storage tank.
® 8
7. A heat exchanger as claimed in claim 3, in which any one of the liquid inlet and liquid outlet opens into one side of the elongate cylindrical body and the other one of the liquid inlet and the liquid outlet opens into another side of the elongate cylindrical body to define a liquid flow path inside the circular cylindrical body.
8. A domestic water heater, which includes a heat exchanger as claimed in any one of claims 1 to 7, in which the inside of the heat exchanger defines a primary heating chamber inside the elongate closed body, the primary heating chamber having a liquid inlet for receiving heated water from a solar collector and a liquid outlet for returning water to a solar collector; and a domestic water heater storage tank to which is mounted the heat exchanger, the inside of the domestic water heater, outside the body of the heat exchanger defining a secondary heating chamber, the domestic water heater having the conventional liquid inlet from a water supply and a liquid outlet to a domestic plumbing installation.
9. A solar heating installation, which includes a domestic water heater as claimed in claim 8; a solar collector in flow communication with the liquid inlet and the liquid outlet of the primary heating chamber of the heat exchanger, for heating liquid inside the heat exchanger; and circulation means for circulating heating liquid from the solar collector to the heat exchanger.
10. A solar heating installation, as claimed in claim 9, in which the circulation means is in the form of a gravity fed installation.
11. A solar heating installation, as claimed in claim 9, in which the circulation means is in the form of a pump operable to pump a heating liquid between the solar collector and the heat exchanger.
® ?
12. A method of heating water in a domestic water heating installation, the method including circulating a heating liquid from a solar collector to a heat exchanger as claimed in claim 1 disposed inside a domestic water heater; and retaining water to be heated inside a domestic water heater for disposal from the water heater.
13. A heat exchanger as claimed in claim 1, substantially as herein described and illustrated.
14. A domestic water heater as claimed in claim 8, substantially as herein described and illustrated.
15. A solar heating installation as claimed in claim 9, substantially as herein described and illustrated.
16. A method of heating water as claimed in claim 12.
17. A new heat exchanger, a new domestic water heater, a new solar heating installation and a new method of heating water, substantially as herein described. Dated this 25" day of March 2010 SMIT & VAN WYK, INC APPLICANT'S PATENT ATTORNEYS
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200902143 | 2009-03-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA201002154B true ZA201002154B (en) | 2010-11-24 |
Family
ID=58161265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA2010/02154A ZA201002154B (en) | 2009-03-27 | 2010-03-25 | Heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| ZA (1) | ZA201002154B (en) |
-
2010
- 2010-03-25 ZA ZA2010/02154A patent/ZA201002154B/en unknown
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