Heat exchange – Regenerator – Checker brick structure
Patent
1989-09-18
1991-06-18
Ford, John
Heat exchange
Regenerator
Checker brick structure
165 16, 165 39, 165 40, 165 54, F24F 1102, F24F 1104, F24D 500
Patent
active
050242636
DESCRIPTION:
BRIEF SUMMARY
An object of the invention is a method and apparatus for the control of the fresh-air, input-air, exhaust-air, waste-air and return-air flows, as well as of the air pressure in the input-air duct and the air pressure in the exhaust-air duct, in an air-conditioning system in which the closing and control mechanisms for the fresh air and fresh-air bypass in relation to the heat recovery exchanger are coupled to each other as an intake-air mechanism and, respectively, the closing and control mechanisms for the exhaust air and return air are coupled to each other as an outlet-air mechanism.
There are two basic types of air-conditioning systems: constant-flow systems and flow-rate controllable systems. The constant-flow systems usually have one or two different operating rates, typically 1/1 rate and 1/2 rate.
In the constant-flow systems, the air flow is not regulated at all after a certain basic setting. For this reason the air flow will change during use as the filters of the air-conditioning system become soiled, as the heating radiator becomes soiled owing to the oil condensed on the cooling radiator, and as the heat recovery exchanger freezes. The air flow will also change owing to, for example, the thermal forces caused in the air-conditioning ducts by the temperature difference between the fresh air and the inside air, or by wind. Also, the air flow in a constant-flow system is not adjusted according to pressure changes in the duct system. Thus the air flows of the air-conditioning plant vary depending on the season of the year, the condition of the filters, and the shape of the characteristic curves of the fans and the duct system. The fresh-air flow and the waste-air flow vary independently of each other.
Flow-rate controllable systems are nowadays always connected with a flow-rate controllable air-conditioning system. The objective of the control is to maintain a constant pressure in the ducts. The pressure in the duct system is measured, and on the basis of this measurement the air flow in the air-conditioning plant is adjusted according to need. The fresh-air flow and the waste-air flow in the air-conditioning system vary independently of each other.
The air flows in present-day air-conditioning systems change readily when, for example, the filters become soiled or the heat recovery device freezes. The fresh-air flow and the waste-air flow change independently of each other, whereupon the pressure relations between the different parts of the building will change. The greatest disadvantage is undoubtedly the changing of the fresh-air flow and the waste-air flow independently of each other. As a consequence of this, humidity present in the indoor air in the building may condense on windows and structures, causing structural damage. Furthermore, spreading of odors around the building and drafts may also result.
By the method according to an embodiment of the invention, a crucial remedy is obtained for the disadvantages described above. In order to achieve this, the method according to an embodiment the invention is characterized in that the control of fresh-air, input-air, exhaust-air, waste-air and return-air flows (A, B, C, D and E, respectively) and of pressure in an input-air duct and of pressure in an exhaust-air duct are interconnected in such a way that a deviation from a predetermined value in one of these will cause a change of predetermined values in the others so that the difference (A-D) between the fresh-air flow and the waste-air flow, or their ratio (A/D), will change in a predetermined way. The apparatus according to an embodiment of the invention is characterized in that fresh-air flow and input-air flow meters and an input-air duct air pressure meter are connected to an input-air flow control and a waste-air flow meter and an exhaust-air duct air pressure meter are connected to a waste-air flow control, and that these control work together and are fitted to act on fans and outlet-air and intake-air mechanisms so that a change in one of the quantities measured will cause an adjustment
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Laine Juhani
Nyman Mikko
Paananen Tapio
Ford John
Ilmatera OY
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