CA1206952A - De-icing heat exchanger - Google Patents
De-icing heat exchangerInfo
- Publication number
- CA1206952A CA1206952A CA000432958A CA432958A CA1206952A CA 1206952 A CA1206952 A CA 1206952A CA 000432958 A CA000432958 A CA 000432958A CA 432958 A CA432958 A CA 432958A CA 1206952 A CA1206952 A CA 1206952A
- Authority
- CA
- Canada
- Prior art keywords
- conduits
- heat exchanger
- air
- icing
- enclosure
- 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
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F17/00—Removing ice or water from heat-exchange apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
TITLE
DE-ICING HEAT EXCHANGER
INVENTOR
David R. Pattie ABSTRACT OF THE DISCLOSURE
A heat exchanger for heat recovery in the ventilation of an enclosure in freezing temperatures. De-icing is facilitated by using conduits for the enhaust air that are directed downwardly and are flared so that ice is readily discharged, making it unnecessary to melt all accumulated ice.
DE-ICING HEAT EXCHANGER
INVENTOR
David R. Pattie ABSTRACT OF THE DISCLOSURE
A heat exchanger for heat recovery in the ventilation of an enclosure in freezing temperatures. De-icing is facilitated by using conduits for the enhaust air that are directed downwardly and are flared so that ice is readily discharged, making it unnecessary to melt all accumulated ice.
Description
Background of the Inventlon This invention relates to a heat exchanger for heat recovery in the ventilation of an enclosure, and particularly to facilitating ice removal from the heat exchanger.
For some enclosures that require heating and ventilation, it is advantageous to use heat exchangers to recover heat from the exhaust air for the incoming ventilation air. Such buildings include lndustrial buildings, enclosures for livestock, and highly sealed dwellings. How-ever, heat exchangers operating ln freezing temperatures are sub~ect to icing. The conventional method of removing ice from heat exchangers is by periodicly melting the accumulated ice. Such melting requires energy and results ln an interruption of operation.
Summary of the Invention It has been found that accumulated ice can be removed more efficiently by using exhaust conduits that are flared and orlented verti-cally 80 that ice will fall out readlly with llttle meltlng in the de-lce period. Accordlngly, the de-ice period is reduced. Also, the latent heat of fusion of the removed unmelted ice will be transferred to the incoming ventilation alr.
The present lnventlon provldes a heat exchanger for transfer-ring heat from exhaust air to incoming ventilation air of an enclosure comprising;
a plurallty of substantially vertlcally oriented conduits having upper and lower ends, a plenum having an inlet for receiving exhaust alr, said plenum enclosing the upper ends of sald condults for channelling exhaust air downwardly through said conduits to exlt from the lower ends of sald condults, enclosure means for enclosing outer surfaces of the condults and havlng an lnlet and outlet for ventllation alr, sald conduits having flared inner passageways expanding outwardly towards the lower end for at least a lower portion ~hereof to facllitate ice removal.
Brief Description of ~he Drawing The figure shows a partially fragmented perspective view of a heat exchanger incorporating the present invention.
12(~69S2 escription of the Preferre~ Embodi~ent With reference to the drawing, the heat exchanger 1 of the present invention oonprises a plurality of substantially vertical conduits 2. Enclosing the upper ends of the conduits 2 is a plenum 3 which is supplied with exhaust air through inlet 4.
me lower portions 12 of oonduits 2 have inner passageways that are flared to expand outwardly towards the bottom. Ventilating air enters at inlet 5 and exits at outlet 6 to the building. A plurality of baffles 7 divides the enclosure 8 for a plurality of passes for the ventilating air.
In operation, when sufficient ice has accumulated to warrant removal, heat is supplied to the conduit. The accumulation of ice may be detected, for example, by a pressure sensor in the plenum 3 that detects a predetenmined pressure rise. Heat may be supplied by various means, for example, by temporarily interrupting input of cold ventilating air. When sufficient heat is supplied, the accumulated ioe will beocme detached fram the walls of the conduits facilitated by the flared geometry.
me foroe of gravity and pressure of exhaust air combine to urge the ice out of the conduits.
Since little of the ice needs to be melted, the period for de,icing is shortened considerably. Also, the latent heat of fusion of the rem~ved unmelted ice is made available to the incoming ventilating air.
,:
For some enclosures that require heating and ventilation, it is advantageous to use heat exchangers to recover heat from the exhaust air for the incoming ventilation air. Such buildings include lndustrial buildings, enclosures for livestock, and highly sealed dwellings. How-ever, heat exchangers operating ln freezing temperatures are sub~ect to icing. The conventional method of removing ice from heat exchangers is by periodicly melting the accumulated ice. Such melting requires energy and results ln an interruption of operation.
Summary of the Invention It has been found that accumulated ice can be removed more efficiently by using exhaust conduits that are flared and orlented verti-cally 80 that ice will fall out readlly with llttle meltlng in the de-lce period. Accordlngly, the de-ice period is reduced. Also, the latent heat of fusion of the removed unmelted ice will be transferred to the incoming ventilation alr.
The present lnventlon provldes a heat exchanger for transfer-ring heat from exhaust air to incoming ventilation air of an enclosure comprising;
a plurallty of substantially vertlcally oriented conduits having upper and lower ends, a plenum having an inlet for receiving exhaust alr, said plenum enclosing the upper ends of sald condults for channelling exhaust air downwardly through said conduits to exlt from the lower ends of sald condults, enclosure means for enclosing outer surfaces of the condults and havlng an lnlet and outlet for ventllation alr, sald conduits having flared inner passageways expanding outwardly towards the lower end for at least a lower portion ~hereof to facllitate ice removal.
Brief Description of ~he Drawing The figure shows a partially fragmented perspective view of a heat exchanger incorporating the present invention.
12(~69S2 escription of the Preferre~ Embodi~ent With reference to the drawing, the heat exchanger 1 of the present invention oonprises a plurality of substantially vertical conduits 2. Enclosing the upper ends of the conduits 2 is a plenum 3 which is supplied with exhaust air through inlet 4.
me lower portions 12 of oonduits 2 have inner passageways that are flared to expand outwardly towards the bottom. Ventilating air enters at inlet 5 and exits at outlet 6 to the building. A plurality of baffles 7 divides the enclosure 8 for a plurality of passes for the ventilating air.
In operation, when sufficient ice has accumulated to warrant removal, heat is supplied to the conduit. The accumulation of ice may be detected, for example, by a pressure sensor in the plenum 3 that detects a predetenmined pressure rise. Heat may be supplied by various means, for example, by temporarily interrupting input of cold ventilating air. When sufficient heat is supplied, the accumulated ioe will beocme detached fram the walls of the conduits facilitated by the flared geometry.
me foroe of gravity and pressure of exhaust air combine to urge the ice out of the conduits.
Since little of the ice needs to be melted, the period for de,icing is shortened considerably. Also, the latent heat of fusion of the rem~ved unmelted ice is made available to the incoming ventilating air.
,:
Claims (3)
1. A heat exchanger for transferring heat from exhaust air to incoming ventilation air of an enclosure comprising:
a plurality of substantially vertically oriented conduits having upper and lower ends, a plenum having an inlet for receiving exhaust air, said plenum enclosing the upper ends of said conduits for channelling exhaust air downwardly through said conduits to exit from the lower ends of said conduits, enclosure means for enclosing outer surfaces of the conduits and having an inlet and outlet for ventilation air, said conduits having flared inner passageways expanding outwardly towards the lower end for at least a lower portion thereof to facilitate ice removal, means for interrupting flow of cold ventilating air to the conduits for de-icing.
a plurality of substantially vertically oriented conduits having upper and lower ends, a plenum having an inlet for receiving exhaust air, said plenum enclosing the upper ends of said conduits for channelling exhaust air downwardly through said conduits to exit from the lower ends of said conduits, enclosure means for enclosing outer surfaces of the conduits and having an inlet and outlet for ventilation air, said conduits having flared inner passageways expanding outwardly towards the lower end for at least a lower portion thereof to facilitate ice removal, means for interrupting flow of cold ventilating air to the conduits for de-icing.
2. The heat exchanger of claim 1 comprising a sensor for detecting a predetermined rise of pressure in the exhaust plenum for initiating de-icing.
3. The heat exchanger of claim 1 wherein said enclosure comprises a plurality of baffles to define an elongated passageway for ventilation air across the outer surfaces of the conduits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000432958A CA1206952A (en) | 1983-07-22 | 1983-07-22 | De-icing heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000432958A CA1206952A (en) | 1983-07-22 | 1983-07-22 | De-icing heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1206952A true CA1206952A (en) | 1986-07-02 |
Family
ID=4125725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000432958A Expired CA1206952A (en) | 1983-07-22 | 1983-07-22 | De-icing heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1206952A (en) |
-
1983
- 1983-07-22 CA CA000432958A patent/CA1206952A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |