Heat exchange – Regenerator
Patent
1993-09-30
1994-12-27
Davis, Jr., Albert W.
Heat exchange
Regenerator
165 54, 165 97, 165 7, F28D 1700
Patent
active
053756495
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a ventilation device with a heat exchanger, and more specifically, to a ventilation device of the type installed in an outer wall of a room.
The increasing importance of energy saving and demand for air exchange, particularly in polluted premises, has created a demand for efficient ventilation devices with heat exchange. Devices are known which involve an interchange operation wherein during one interval of operation one or more heat exchange elements are heated by exhausting room air and this heat is released to ingoing ambient air in a following interval of operation.
Known ventilation devices with reversible fans for simultaneously interchanging suction and exhaust, are not able to provide balance in the air delivery when the air direction is changed, as different pressure losses encountered with different directions create unequal air transport volumes. To achieve air balance during operation of the device, velocity control of the reversible fans is needed. Instantaneous adjustment of differences in pressure loss by controlling the fan velocity requires complicated and expensive equipment, and is difficult to achieve.
SUMMARY OF THE INVENTION
The general object of the present invention is to provide a ventilation device with heat exchanger suitable for controlled air exchange with heat recovery in premises having demanding requirements as to noise and air balance, e.g., rooms of domestic dwellings.
It is a particular object to provide a ventilation device with equal pressure distribution and equal air volumes in both suction and exhaust directions and with low pressure losses to enable the use of low noise radial fans. The device should also be of simple construction and be easy to clean and service.
These objects are achieved in accordance with the present invention, by a ventilation arrangement or unit for installation in an outer wall of a room, wherein each of two ventilation passages has a heat exchange element and a fan connected to a control system for reversing the flow direction, each ventilation passage has two separate and generally identical heat exchange elements, and the fan in each passage is arranged generally centrally between the heat exchange elements. Preferably, a dividing wall is provided mid-way along the flow axis between the heat exchange elements of each passage, and the fan is a radial fan mounted with close clearance in a circular opening in the respective dividing wall.
BRIEF DESCRIPTION OF THE DRAWINGS
The preferred embodiment of the invention is described further with reference to the accompanying drawings, wherein,
FIG. 1 shows a vertical section centrally through one section of a ventilation device according to the invention, and
FIG. 2 shows a front view of the inner part of the device, as observed along line 2--2 of FIG. 1, and
in both Figures, a pivotable part of the device is showed by ghost lines in a lowered position.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The illustrated ventilation device .is denoted with reference numeral 11. It is installed as a unit in an opening 12 in a wall 13 dividing a room from an ambient area 15 with a different enthalpy. The device can also be installed in a reverse manner.
The ventilation device 11 comprises a first set of two identical tube shaped outer elements 16A and 16B adjacently arranged with parallel axes on a carrying plate 17 flush with the inner ends, and situated with close clearance to the inner surface of the wall 13. Inside each of the tube shaped elements 16A and 16B, an outer heat exchange element 18A and 18B is arranged. Said elements may be manufactured by helicaly winding corrugated aluminium foil. Other known heat exchange elements may also be utilized.
On the inner side of the tube shaped elements 16A and 16B relative to the room, a second set of tube shaped inner elements 19A and 19B with a corresponding carrying plate, tube shape and diameter as the first set of tube shaped elements is arranged. The second, inner set of tube shaped elements
REFERENCES:
patent: 2011117 (1935-08-01), Richter
patent: 3263400 (1966-08-01), Hobe et al.
patent: 3941185 (1976-03-01), Henning
patent: 4261255 (1981-04-01), Anderson et al.
patent: 4711293 (1987-12-01), Niwa et al.
patent: 5050667 (1991-09-01), Berner et al.
Nilsen Trond
Normann Erling
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