Patent US3935898A successfully refreshed from Google Patents.
US3935898A
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US
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Device for air-conditioning a number of rooms the heat requirements of which are different and vary preferably with respect to time
Assignee: Svenska Flaktfabriken AB
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Filing: 1974-09-25
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Granted: 1976-02-03
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Expires: 1994-09-25
Abstract
Abstract A system for air-conditioning an installation having a number of rooms, the heat requirements of which are different and vary preferably with respect to time, which rooms are connected to a central air-conditioning unit. Light fixtures producing radiation heat are mounted in said rooms and are cooled in known manner by discharge air from the rooms to reduce the radiation heat. The temperature of the air from the central unit is maintained not higher than required for the room in the installation which has the greatest heat development, and the radiation heat from said light fittings is utilized and adjusted to additionally heat the rooms as described in U.S. Pat. No. 3,812,904. The adjustment provides maximum room heating by minimizing the cooling by the discharge air and minimum room heating by maximizing the cooling by the discharge air, minimum room ventilation flow being met when providing maximum heating and the flow increasing as heating is reduced.
Inventors
- 👤 Folke Westergren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:19
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044; F24F3/056; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/76
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
230 words
A method for air-conditioning a number of rooms, the heat requirements of which are different and vary preferably with respect to time, which rooms are connected to a central air-conditioning unit, and light fixtures producing radiation heat are mounted in said rooms and cooled in known manner by discharge air from the rooms to reduce the radiation heat, the temperature of the air from the central unit being maintained not higher than required for the room in the installation which has the greatest heat development, and the radiation heat from said light fixtures being utilized and adjusted to additionally heat the rooms, characterized in that the air flow through a room is adjusted between a highest value adapted for the maximum cooling demand and a minimum value adapted for the necessary ventilation demand, in such a manner, that the discharge air is divided into a constant first portion constituting said minimum flow and a second portion varying with the cooling demand which is passed in heat exchange with the fixtures, that the variable portion of the discharge air is adjusted between highest value and zero, in which latter position the electric heating effect of the fixtures is utilized for room heating whereby the range of adjustability is increased, and that the supply air flow is varied so as to be the total of said constant and said variable discharge portions.
Claim 2
Independent Claim
230 words
A method for air-conditioning a number of rooms, the heat requirements of which are different and vary preferably with respect to time, which rooms are connected to a central air-conditioning unit, and light fixtures producing radiation heat are mounted in said rooms and cooled in known manner by discharge air from the rooms to reduce the radiation heat, the temperature of the air from the central unit being maintained not higher than required for the room in the installation which has the greatest heat development, and the radiation heat from said light fixtures being utilized and adjusted to additionally heat the rooms, characterized in that the air flow through a room is adjusted between a highest value adapted for the maximum cooling demand and a minimum value adapted for the necessary ventilation demand, in such a manner, that the discharge air is divided into a constant first portion constituting said minimum flow and a second portion varying with the cooling demand which is passed in heat exchange with the fixtures, that the variable portion of the discharge air is adjusted between highest value and zero, in which latter position the electric heating effect of the fixtures is utilized for room heating whereby the range of adjustability is increased, and that the supply air flow is varied so as to be the total of said constant and said variable discharge portions.
Claim 3
Dependent Claim
146 words
An individual room control device in a system for air-conditioning a number of rooms comprising means to introduce a flow of central air into said individual room at a temperature below the desired room temperature, a light fixture to supply additional heat to said room, means to discharge a first constant flow of discharge air from said room, means to discharge a second flow of discharge air from said room into heat exchange relation with said fixture to reduce the heat supplied to said room by said fixture, a thermostat fan sensing the temperature of said room, a discharge control device controlled in response to said thermostat for varying said second flow between a minimum and a maximum, and an inlet control device controlled in response to thermostat to introduce central air in an amount corresponding to the sum of said first and second discharge flows.
Claim 4
Dependent Claim
146 words
An individual room control device in a system for air-conditioning a number of rooms comprising means to introduce a flow of central air into said individual room at a temperature below the desired room temperature, a light fixture to supply additional heat to said room, means to discharge a first constant flow of discharge air from said room, means to discharge a second flow of discharge air from said room into heat exchange relation with said fixture to reduce the heat supplied to said room by said fixture, a thermostat fan sensing the temperature of said room, a discharge control device controlled in response to said thermostat for varying said second flow between a minimum and a maximum, and an inlet control device controlled in response to thermostat to introduce central air in an amount corresponding to the sum of said first and second discharge flows.
Claim 5
Dependent Claim
21 words
A device according to claim 2 wherein said second flow control device is regulated from zero flow to the maximum flow.
Claim 6
Dependent Claim
32 words
A device according to claim 3 including a heat exchange device in said inlet controlled by said thermostat to heat said inlet air when said second discharge flow is reduced to zero.
Claim 7
Dependent Claim
39 words
A device according to claim 2 for air-conditioning a number of rooms, characterized in that the constant portion of the discharge air flow is passed through a by-pass duct, and the variable portion is passed through the lighting fixture.
Claim 8
Dependent Claim
30 words
A device according to claim 2 for air-conditioning a number of rooms, characterized in that the constant portion of the discharge air flow is passed through a discharge air window.
Claim 9
Dependent Claim
30 words
A device according to claim 2 including a manually adjustable control for regulating said first constant flow to a value which provides the minimum necessary ventilating air for the room.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |