Ventilation – Having inlet airway – Including specific air distributor
Reexamination Certificate
2000-01-13
2001-07-31
Joyce, Harold (Department: 3749)
Ventilation
Having inlet airway
Including specific air distributor
C454S296000
Reexamination Certificate
active
06267666
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method for air-conditioning a room by means of an air-conditioned ceiling made of acoustic tiles arranged to be spaced from the room ceiling, which acoustic tiles or panels consist of an air-permeable material having a porous cover.
BACKGROUND OF THE INVENTION
Patent Application EP 0 756 138 A2 discloses a known flat cooling and heating element, which is used to construct an air-conditioned ceiling. Above the air-conditioned ceiling a partial flow of supply air is produced and passes through the porous acoustic tiles of the air-conditioned ceiling and into the room therebelow. A further partial flow of outside air is sucked in and is blown directly into the room through a wall of the room. It is therefore not necessary to hermetically seal off the space above the air-conditioned ceiling against the room therebelow, especially since the partial flow through the air-conditioned ceiling can also be supplemented by a further partial flow, which reaches into the room through a larger opening in the air-conditioned ceiling without a significant drop in pressure. Temperature control of the room occurs essentially through convection and requires a considerable control input.
Patent Application NL 8502079 A also discloses a known closed intermediate ceiling suspended in a room, which divides a cavity created at the ceiling of the room, through which cavity supply air is fed through the intermediate ceiling. The spent air is sucked out of the room through outlets in the floor. Temperature control of the room is, however, not intended, and the intermediate ceiling also does not consist of acoustic tiles, which would act in a noise absorbing and heat conducting manner, so that the supplementary provision of a heat exchanger cannot result in a satisfactory room temperature and sound absorption.
The purpose of the invention is therefore to design a method for air-conditioning a room by means of an air-conditioned ceiling so that little input is required for temperature control and regulation. Thus, the method for air-conditioning creates a comfortable, draft-free room climate, and maintains thereby the advantages of a sound-absorbing and heat-conducting design.
SUMMARY OF THE INVENTION
The purpose is attained according to the invention by arranging the acoustic tiles such that between the air-conditioned ceiling and the room ceiling there is created a cavity, which is flow-connected to the room through the air-conditioned ceiling and is otherwise sealed off against the room. The supply air is fed completely or at least predominantly through the air-conditioned ceiling to the room. Furthermore the cavity is charged with temperature controlled air and its air pressure is chosen such that a laminar air flow is produced through the acoustic tiles and toward the room without a draft occurring in the room. Furthermore the material of the acoustic tile and its cover are chosen such that a portion of the heat radiation in the heat transported into the room through the acoustic tiles, that occurs as heat radiation lies between 20 and 80%. Finally the spent air is discharged from an area of the room which is spaced from the air-conditioned ceiling and/or is partitioned off against the heat radiation coming from the ceiling.
There is no danger that a room air-conditioned in this manner would experience drafts or fall below the condensation point due to directly introduced outside air. On the other hand, a discharge of the air in the room which is protected against the heat radiation, can take care of a continuous air heat exchange without significant heat loss. It is very important that the supply air prior to its entry into the room enters into a heat exchange with the acoustic tiles so that said tiles emit a heat radiation and the room can be temperature controlled within a short period of time. Such an effect can be achieved in a simple manner with an air-conditioned ceiling, in which the material and the construction of the acoustic tiles and their cover are chosen with a high heat-transfer coefficient and in such a manner that the portion of the heat radiation transported into the room lies between 20 and 80% and the room can be temperature controlled within a short period of time.
It is advantageous when the air pressure and the acoustic tiles are chosen such that between the cavity and the room there occurs a pressure difference of at most 20 Pa. This guarantees that on the one hand a sufficient air-exchange number is achieved without, on the other hand, drafts occurring. Thus turbulences directly on the air-conditioned ceiling can be avoided when the laminar air flow exits the air-conditioned ceiling at a speed of at most 0.1 m/s. The air flow in the room itself is not supposed to exceed 0.25 m/s.
As a whole, such an air-conditioned ceiling meets high demands with regard to comfort and health for the air-conditioned room while placing minor requirements on the structural input and the maintenance of the system. Thus the cavity is free of components and the room air falling below the condensation point due to a supply of outside air is not to be feared. The method creates an arrangement, in which the tasks of an air-conditioned ceiling and of an air-circulating system are realized at the same time so that the manufacture and the installation can occur extremely economically.
REFERENCES:
patent: 2221001 (1940-11-01), Lucius
patent: 2291220 (1942-07-01), Germonprez
patent: 3570385 (1971-03-01), Heisterkamp
patent: 4487794 (1984-12-01), Brown
patent: 4554766 (1985-11-01), Ziemer et al.
patent: 5248278 (1993-09-01), Fuerst et al.
patent: 2426946 (1975-12-01), None
patent: 3240842 A1 (1984-05-01), None
patent: 35339063 (1987-05-01), None
patent: 0 399 935 (1990-11-01), None
patent: 0 756 138 A2 (1997-01-01), None
patent: 900 896 (1962-07-01), None
patent: 8502079 (1985-07-01), None
Verdraengngsstroemung—Dr. Franz Sodec, Aachen TAB 7/90 pp. 579, 580, 581, 582, and 584.
Boles Derek S.
Flynn ,Thiel, Boutell & Tanis, P.C.
Joyce Harold
Wilhelmi Werke AG
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