Heating systems – Automatic control – Water
Patent
1994-10-05
1997-12-09
Tapolcai, William E.
Heating systems
Automatic control
Water
237 63, F24F 300
Patent
active
056951183
DESCRIPTION:
BRIEF SUMMARY
AREA OF INVENTION
The present invention relates to a fluid control system for distribution of a heat medium to several parallel heat consumers.
PRIOR ART
A floor heating system is often used instead of a radiator heating system in heating domestic houses and industrial buildings etc.
In previous radiator systems, such radiators are often placed at the wall below each windows. In a floor heating systems such radiators are replaced by heating hoses or tubes positioned in the floor. Such a floor heating system is often regarded as more comfortable because it locates the heat where it is needed, at the lower part of the rooms. Moreover, a floor heating system is inherently a low temperature system, which lends itself to operation by heat pumps, thus saving costs for heating. The system according to the invention is also suitable for use together with gas burners, which also operate at low temperature and other similar systems.
A floor heating system comprises several hoses or tubes positioned in the floor structure, or below the floor. Such a floor heating member for each room is controlled by a valve for maintaining the heat medium in the member in accordance with the heat requirements of the room. Often, several valves for several rooms are gathered in a central panel and distribution lines transport heat medium from the valves in the panel to the intended room.
Such floor heating members are often connected in parallel to a circulation pump and a heat source. However, such a parallel system of valves is difficult to control since the adjustment of one valve influences upon the heat transfer in a heating member of an adjacent valve. It is very important to balance the system in advance so that such adjustments are
The object of the present invention is to suggest a fluid control system in which such parallel connected valves can be adjusted independent of each other without influencing each other.
DISCLOSURE OF THE INVENTION
Accordingly, there is provided a method of operating a fluid control system, comprising a heat source for a heat medium, several distribution valves for distribution of heat medium to several heat consumers, a feed line for transmitting warm heat medium from the heat source to the distribution valves, distribution lines for transmitting heat medium from the distribution valves to the heat consumers and return lines for transmitting heat medium from the heat consumers back to the heat source. According to the invention, the method comprises the following steps: feeding cold heat medium to each distribution valve in addition to warm heat medium from the heat source; mixing cold and warm heat medium by said distribution valves; feeding said mixed heat medium to said heat consumers; and returning heat medium from the heat consumers to said heat source. The mixing ratio of cold and warm heat medium is controlled in dependence of the heat requirement of the corresponding heat consumer, and the flow to and from each heat consumer is maintained constant independent of said mixing ratio and the heat requirement of the corresponding heat consumer.
According to the invention there is also provided a fluid control system, as defined above, comprising a second feed line for transmitting cod heat medium to each distribution valve in addition to warm heat medium from the heat source; a pump in the return line common to several heat consumers; and a distribution valve, comprising a first adjustment means for adjusting the flow through an output of the valve, and a second adjustment means for adjusting the mixture ratio between cold and warm heat medium, said adjustment means being independent of each other. The first adjustment means comprises an adjustment member for adjustment thereof, which is essentially inaccessible at operation of the system and is adjusted once at the initial set-up of the system, and said second adjustment means comprises an adjustment member which is operated by a temperature control system.
Moreover, there is provided a distribution valve having a first inlet for warm f
REFERENCES:
patent: 3282295 (1966-11-01), Skriletz et al.
patent: 3897903 (1975-08-01), Race
patent: 4679729 (1987-07-01), Petitjean et al.
patent: 4708287 (1987-11-01), De Wit
patent: 4907739 (1990-03-01), Drake
patent: 5119988 (1992-06-01), Fiedrich
Roth Scandinavia AB
Tapolcai William E.
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