CA1122635A - Convector heater - Google Patents
Convector heaterInfo
- Publication number
- CA1122635A CA1122635A CA320,316A CA320316A CA1122635A CA 1122635 A CA1122635 A CA 1122635A CA 320316 A CA320316 A CA 320316A CA 1122635 A CA1122635 A CA 1122635A
- Authority
- CA
- Canada
- Prior art keywords
- cabinet
- flow
- air
- convection
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/002—Air heaters using electric energy supply
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Central Heating Systems (AREA)
- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
- Direct Air Heating By Heater Or Combustion Gas (AREA)
- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
Abstract
Abstract Convector Heater A convector heater is disclosed with a cabinet 1 having a top vent 2 and a bottom vent 3 for allowing a convection flow to flow through the cabinet 1. A heat exchanger 4 is mounted in the cabinet 1. At least one supplementary air inlet 6, 7 in a face 8 of the cabinet 1 for allowing supplementary air to enter the cabinet 1 and supplement convection air flow induced in the cabinet 1 by the heat exchanger 4.
Description
1 According to the invention there is provided a convector heater comprising a cabinet having top and bottom air vents and a partitionless interior;
electrically heated heat exchanger means mounted within the cabinet for inducing a convection air flow to flow through the cabinet and the air vents and for heating the convection air flow, the convection air flow occurring as a single flow occupying the entire interior of the cabinet; a supplementary air inlet means, provided in a face of the cabinet, for allowing additional air to enter the cabinet and to supplement the convection air flow; >
and inwardly and upwardly inclined deflector means, integral with the face at the foot of the inlet means and sloping upwardly in the cabinet into the path of the convection flow, for diverting the convection air flow impinging thereon from below and for directing the additional air entering through the inlet means into the convection air flow to mix therewith.
A supplementary air inlet may be provided level with or below the heat exchanger for allowing additional air to flow into the cabinet and be heated by the heat exchanger. Additional air from this inlet assists in maintaining the mean convection air flow temperature at the top vent, and indeed the top vent itself, at an acceptably low level.
A supplementary air inlet may be provided above the heat exchanger for allowing additional air to flow into the cabinet to cool air therein already heated by the heat exchanger. Preferably this supplementary air inlet is provided immediately below the top edge between the top vent and the said face for allowing additional air to flow into the cabinet to cool the top edge. Thus the top edge is kept at an acceptably low temperature.
In a preferred embodiment, both such supplementary air inlets are provided.
Preferably each supplementary air inlet extends horizontal across the face and the upward-direction of each such inlet is effected by inclining a deflector, integral with the face at the foot of the inlet, inwardly of the cabinet.
The deflector may be surmounted by a strip angled up to be parallel with the side having the supplementary air inlet.
In oraer that the invention may be more readily understood, a specific embodiment thereof will now be described with reference to the accompanying drawings in which:-Figure 1 is a perspective view of a convector heateraccording to the invention, ~ 15 Figure 2 is a cross-section viewed in the direction of arrow A in Figure 1 and taken half-way along the cabinet, and Figure 3 is an end view in the direction of the arrow A
in Figure 1.
The illus~rated convector heater has a cabinet 1 with finned grilles in top and bottom vents 2, 3. A heater exchanger 4 (see Figure 2) of the kind described in Canadian patent 1,077,113 is mounted in the cabinet 1 near the bottom thereof by means o brackets 5. The heat exchanger comprises an elongate electrically heated element, a spine surrounding the element and a pair of banks of parallel fins extending upwardly from the spine in Vee formation, each fin being planar, disposed perpendicular to the heat source and in alignment with the convection air flow.
Supplementary air inlets 6, 7 extend horizontally ; 30 in the front face 8 of the cabinet. These air inlets are given an upwards direction by deflectors 9, 10 which are integral with the face 8, being bent inwardly ,~
~22635 of the cabinet nt the bottom of each inlet. To steady the top ed$e of the deflectors integral tabs 11 inter- _ connect with the face immediately above the inlets.
Clearly~ these tabs ~ust not extend more than n short distance along the inlet in order not to obstruct it;
they Are provided only at the endq thereof.
In operation, the heat exchanser induces a con-vection air flow within the cabinet. Air passing up the cabinet close to the inlet 7 which is on a level with heat exchanger 4, will be at a reduced pressure (on account of t1le convection flow) in comparison with the ! ambient pres~ure outside the inlet 7. Accordinsly9 there will be an additional flow of air into the cabinet.
This results in the air leaving the heater via the top grille 2 being at a lower temperature than it would have been in the absence of inlet 7, since more air is being heated by an electrically heated element having a given heating capacity. Similarly~ further additional air flows throu~h the inlet 6 to cool the top-front edge 12 of the cabinet. As there i~ less scope for this additional air to mix with the general flow out of the top vent 2, its coolin$ effect is restricted to the vicinity of the edge 12.
The cabinet 1 includes a number of other notewor*hy featureq. The front face panel 8 has turned back end portions whereby it i6 fastened by self tapping screws 13 to the ends of the cabinet. To ob~cure the screw heads and sive the cabinet a neat appearance, cover plates 14 of pla tics material are clipped to the ends of the cabinet over the screws and the end portions.
To alleviate the problem of convection-air-borne dust soiling the wall above the heater, the illustrated heater being intended for wall mountinS~ the back panel has a deflectin~ portion 15 for deflecting the convection air away from the wall. Controls for the heater are ~2263S
accommodated behind the top left hand corner of the cabinet. As shown the control comprises an on/off switch 16 and a thermostat controlled by thumbwheel 17.
To avoid overheating the controls, the heat exchanger 4 does not extend below the controls.
The illustrated heater has a length of 700 mm and a height of 180 mm. When fitted with a 1 kw heater element the temperature of the cabinet nowhere - including at the edge 12 - exceeds 90 degrees C under normal operating conditions except that the temperaure of the air flow at the top vent 2 - and the top grille - reaches 115 degrees C. This can be compared with a top vent temperature of around 240 degrees C without the supplementary air inlets. A further comparison can be maae with another similar heater without supplementary air inlets but having its height increased to 300 mm. In this instance, the top vent temperature is 115 degrees C. Thus in terms of temperature of the cabinet, a heater of height 180 mm including supplementary air inlets is equivalent to a heater of height 300 mm high without the supplementary air inlets. The saving of space and material can be appreciated.
The invention is not intendea to be restricted to the details of the above described embodiment. The number ot supplementary air inlets can be varied. For instance four inlets, two in each face, may be employed in a free stan~ing as opposed to wall mounted heater. Further, heat exchangers other than that described in Canadian patent 1,077,113 may be utilised.
,, .
~, ~,.
electrically heated heat exchanger means mounted within the cabinet for inducing a convection air flow to flow through the cabinet and the air vents and for heating the convection air flow, the convection air flow occurring as a single flow occupying the entire interior of the cabinet; a supplementary air inlet means, provided in a face of the cabinet, for allowing additional air to enter the cabinet and to supplement the convection air flow; >
and inwardly and upwardly inclined deflector means, integral with the face at the foot of the inlet means and sloping upwardly in the cabinet into the path of the convection flow, for diverting the convection air flow impinging thereon from below and for directing the additional air entering through the inlet means into the convection air flow to mix therewith.
A supplementary air inlet may be provided level with or below the heat exchanger for allowing additional air to flow into the cabinet and be heated by the heat exchanger. Additional air from this inlet assists in maintaining the mean convection air flow temperature at the top vent, and indeed the top vent itself, at an acceptably low level.
A supplementary air inlet may be provided above the heat exchanger for allowing additional air to flow into the cabinet to cool air therein already heated by the heat exchanger. Preferably this supplementary air inlet is provided immediately below the top edge between the top vent and the said face for allowing additional air to flow into the cabinet to cool the top edge. Thus the top edge is kept at an acceptably low temperature.
In a preferred embodiment, both such supplementary air inlets are provided.
Preferably each supplementary air inlet extends horizontal across the face and the upward-direction of each such inlet is effected by inclining a deflector, integral with the face at the foot of the inlet, inwardly of the cabinet.
The deflector may be surmounted by a strip angled up to be parallel with the side having the supplementary air inlet.
In oraer that the invention may be more readily understood, a specific embodiment thereof will now be described with reference to the accompanying drawings in which:-Figure 1 is a perspective view of a convector heateraccording to the invention, ~ 15 Figure 2 is a cross-section viewed in the direction of arrow A in Figure 1 and taken half-way along the cabinet, and Figure 3 is an end view in the direction of the arrow A
in Figure 1.
The illus~rated convector heater has a cabinet 1 with finned grilles in top and bottom vents 2, 3. A heater exchanger 4 (see Figure 2) of the kind described in Canadian patent 1,077,113 is mounted in the cabinet 1 near the bottom thereof by means o brackets 5. The heat exchanger comprises an elongate electrically heated element, a spine surrounding the element and a pair of banks of parallel fins extending upwardly from the spine in Vee formation, each fin being planar, disposed perpendicular to the heat source and in alignment with the convection air flow.
Supplementary air inlets 6, 7 extend horizontally ; 30 in the front face 8 of the cabinet. These air inlets are given an upwards direction by deflectors 9, 10 which are integral with the face 8, being bent inwardly ,~
~22635 of the cabinet nt the bottom of each inlet. To steady the top ed$e of the deflectors integral tabs 11 inter- _ connect with the face immediately above the inlets.
Clearly~ these tabs ~ust not extend more than n short distance along the inlet in order not to obstruct it;
they Are provided only at the endq thereof.
In operation, the heat exchanser induces a con-vection air flow within the cabinet. Air passing up the cabinet close to the inlet 7 which is on a level with heat exchanger 4, will be at a reduced pressure (on account of t1le convection flow) in comparison with the ! ambient pres~ure outside the inlet 7. Accordinsly9 there will be an additional flow of air into the cabinet.
This results in the air leaving the heater via the top grille 2 being at a lower temperature than it would have been in the absence of inlet 7, since more air is being heated by an electrically heated element having a given heating capacity. Similarly~ further additional air flows throu~h the inlet 6 to cool the top-front edge 12 of the cabinet. As there i~ less scope for this additional air to mix with the general flow out of the top vent 2, its coolin$ effect is restricted to the vicinity of the edge 12.
The cabinet 1 includes a number of other notewor*hy featureq. The front face panel 8 has turned back end portions whereby it i6 fastened by self tapping screws 13 to the ends of the cabinet. To ob~cure the screw heads and sive the cabinet a neat appearance, cover plates 14 of pla tics material are clipped to the ends of the cabinet over the screws and the end portions.
To alleviate the problem of convection-air-borne dust soiling the wall above the heater, the illustrated heater being intended for wall mountinS~ the back panel has a deflectin~ portion 15 for deflecting the convection air away from the wall. Controls for the heater are ~2263S
accommodated behind the top left hand corner of the cabinet. As shown the control comprises an on/off switch 16 and a thermostat controlled by thumbwheel 17.
To avoid overheating the controls, the heat exchanger 4 does not extend below the controls.
The illustrated heater has a length of 700 mm and a height of 180 mm. When fitted with a 1 kw heater element the temperature of the cabinet nowhere - including at the edge 12 - exceeds 90 degrees C under normal operating conditions except that the temperaure of the air flow at the top vent 2 - and the top grille - reaches 115 degrees C. This can be compared with a top vent temperature of around 240 degrees C without the supplementary air inlets. A further comparison can be maae with another similar heater without supplementary air inlets but having its height increased to 300 mm. In this instance, the top vent temperature is 115 degrees C. Thus in terms of temperature of the cabinet, a heater of height 180 mm including supplementary air inlets is equivalent to a heater of height 300 mm high without the supplementary air inlets. The saving of space and material can be appreciated.
The invention is not intendea to be restricted to the details of the above described embodiment. The number ot supplementary air inlets can be varied. For instance four inlets, two in each face, may be employed in a free stan~ing as opposed to wall mounted heater. Further, heat exchangers other than that described in Canadian patent 1,077,113 may be utilised.
,, .
~, ~,.
Claims (7)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A convector heater comprising:
a cabinet having top and bottom air vents and a partitionless interior;
electrically heated heat exchanger means mounted within said cabinet for inducing a convection air flow to flow through said cabinet and said air vents and for heating said convection air flow, said convection air flow occurring as a single flow occupying the entire interior of said cabinet;
a supplementary air inlet means, provided in a face of said cabinet, for allowing additional air to enter said cabinet and to supplement said convection air flow; and inwardly and upwardly inclined deflector means, integral with said face at the foot of said inlet means and sloping upwardly in said cabinet into the path of the convection flow, for diverting said convection air flow impinging thereon from below and for directing said additional air entering through said inlet means into said convection air flow to mix therewith.
a cabinet having top and bottom air vents and a partitionless interior;
electrically heated heat exchanger means mounted within said cabinet for inducing a convection air flow to flow through said cabinet and said air vents and for heating said convection air flow, said convection air flow occurring as a single flow occupying the entire interior of said cabinet;
a supplementary air inlet means, provided in a face of said cabinet, for allowing additional air to enter said cabinet and to supplement said convection air flow; and inwardly and upwardly inclined deflector means, integral with said face at the foot of said inlet means and sloping upwardly in said cabinet into the path of the convection flow, for diverting said convection air flow impinging thereon from below and for directing said additional air entering through said inlet means into said convection air flow to mix therewith.
2. A convection heater as claimed in claim 1 wherein said supplementary air inlet means is located at a level below the top of said heat exchanger, for allowing additonal air to flow into said cabinet and be heated by said heat exchanger.
3. A convector heater as claimed in claim 1 wherein said supplementary air inlet means is located at a level above said heat exchanger, for allowing additional air to flow into said cabinet to cool, in the vicinity of said supplementary air inlet means, said convection air flow therein already heated by said heat exchanger.
4. A convector heater as claimed in claim 1 wherein said supplementary air inlet means is provided in the face of the cabinet, a first said supplementary air inlet means is provided immediately below a top edge of said cabinet, which edge extends along the front of said top air vent and along the top of said face for allowing additional air to flow into said cabinet to cool said top edge, and a second said supplementary air inlet means is provided at a level below the top of said heat exchanger, for allowing additional air to flow into said cabinet and be heated by said heat exchanger.
5. A convector heater as claimed in claim 1 wherein said supplementary air inlet means extends horizontally across said face in which it is positioned.
6. A convector heater as claimed in claim 1 wherein said face of said cabinet comprises a panel having turned-back end portions by which said panel is fastened to the ends of said cabinet, and further comprising plastic cover plates covering said turned-back end portions.
7. A convector heater as claimed in claim 1 wherein said heat exchanger comprises an elongate electrically heated element, a spine surrounding said element, and a pair of banks of parallel fins extending upwardly from said spine in a Vee-shaped formation, each said fin being planar, disposed perpendicular to said heat source and in alignment with said air flow.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4090/78 | 1978-02-01 | ||
| GB409078 | 1978-02-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122635A true CA1122635A (en) | 1982-04-27 |
Family
ID=9770557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA320,316A Expired CA1122635A (en) | 1978-02-01 | 1979-01-26 | Convector heater |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1122635A (en) |
| DE (1) | DE2902669A1 (en) |
| ES (1) | ES477345A1 (en) |
| FR (1) | FR2416429B1 (en) |
| SE (1) | SE7900710L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020151253A1 (en) * | 2019-01-24 | 2020-07-30 | 珠海格力电器股份有限公司 | Electric heater |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1861484A (en) * | 1931-05-25 | 1932-06-07 | Nat Trust Company Ltd | Concealed heater |
| CH411283A (en) * | 1963-12-24 | 1966-04-15 | Licentia Gmbh | Electric space heater |
| DE1929695U (en) * | 1965-10-13 | 1965-12-23 | Witte Heiztechnik G M B H & Co | HOUSING FOR ELECTRIC STORAGE OVEN. |
| FR2122620A5 (en) * | 1970-12-10 | 1972-09-01 | Montmorency Atel | COLD AIR HEATING DEVICE |
| FR2302485A1 (en) * | 1975-02-26 | 1976-09-24 | Lafumas Pierre | Built in electric convector heater - has casing fitting cavity in wall and projecting front panel carrying heating element and having lower air inlet |
| GB1535561A (en) * | 1976-01-23 | 1978-12-13 | Tugonia Ag | Heat exchanger for convector heater |
| GB1537783A (en) * | 1976-02-20 | 1979-01-04 | Prl Soc | Convector heater |
-
1979
- 1979-01-24 DE DE19792902669 patent/DE2902669A1/en not_active Ceased
- 1979-01-26 SE SE7900710A patent/SE7900710L/en not_active Application Discontinuation
- 1979-01-26 CA CA320,316A patent/CA1122635A/en not_active Expired
- 1979-01-30 FR FR7902287A patent/FR2416429B1/en not_active Expired
- 1979-01-31 ES ES477345A patent/ES477345A1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020151253A1 (en) * | 2019-01-24 | 2020-07-30 | 珠海格力电器股份有限公司 | Electric heater |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2416429A1 (en) | 1979-08-31 |
| FR2416429B1 (en) | 1985-06-28 |
| SE7900710L (en) | 1979-08-02 |
| ES477345A1 (en) | 1979-10-16 |
| DE2902669A1 (en) | 1979-08-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |