Device for controlling heating boilers

Heating systems – Combined with water heater

Patent

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Details

122446, 236 46R, 237 8R, F24D 308

Patent

active

054700191

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART

The present invention relates to a device for heating boilers in heating plants having a means for heating a heat carrying medium present in the boiler and circulating out thereof in the heating plant as well as a means adapted to detect the temperature of the heat carrying medium present in the boiler and send signals to the heating means to start and stop the heating of the medium when a first lower temperature level is underpassed and a second higher temperature level is exceeded, respectively, by the medium in the heating boiler.
The invention is in particular directed to devices for oil and gas boilers, and it will as a consequence thereof be discussed below for this application for exemplifying but non-limitative purpose. A disadvantage in common to all heating boilers for heating the rooms of a building and provide tap hot-water consists in that they are dimensioned so that they are able to manage conditions, in which an extremely high heating demand exists, i.e. during the coldest winter days. This means that the capacity of the heating boilers is utilised to the greatest extent during cold periods, but the heating boilers get over-dimensioned with respect to the rest of the year, when the heating demand generally is only a fraction of the amount of heat which may be supplied by the boilers, so that the efficiency sometimes will be comparatively low.
It would therefor be desired to improve the efficiency of a heating boiler, so that it may comply with the heating demand when this is extremely high but nevertheless requires a considerably lower amount of supplied energy, in the oil boiler case fuel in the form of oil, for obtaining the heating comfort aimed at during periods of both high and low heat demands, and especially in the latter case, in which the heating boiler must be considered to be strongly over-dimensioned.


SUMMARY OF THE INVENTION

Accordingly, the object of the present invention is to provide a device according to the type mentioned in the introduction, which finds a remedy to the inconveniences mentioned above by making it possible to increase the efficiency of a heating boiler, especially when the heat demand is low, i.e. during warm seasons.
This object is obtained by the invention by providing a device of the type mentioned in the introduction with means adapted to delay the start of the heating means when the first temperature level is reached by the medium and this is detected by the detecting means.
Thus, by the invention it has been realized that it is possible to increase the efficiency of a heating boiler by modifying the heating cycles thereof. The detecting means of the device according to the invention has the task to keep the temperature of the heat carrying means present in the heating boiler, i.e. usually the water, between said first and second levels and by that almost static, for what reason the detecting means for the sake of simplicity will be called thermal relay in the following. By the fact that the device according to the invention delays the start of the heating means commanded by the thermal relay the temperature of the heat carrying medium present in the heating boiler will fall slightly, but this will not detrimentally influence the heating capacity of the heating plant, since the medium circulating in the heating system of the building in question has a considerably lower temperature than the medium present in the boiler, and the shunt valve co-ordinated with the boiler is able to compensate this small lowering of the temperature of the heat carrying medium of the heating boiler. It has been found that a prolongation of the off time of the heating boiler by a certain ratio with respect to the normal off time commanded by the thermal relay does not require a prolongation of the heating time of the heating means of a ratio being just as high should said means in the heating in both cases deliver the same power. Expressed in another way this means that the device according to the invention leads to a requirement of a

REFERENCES:
patent: 2266245 (1940-12-01), Osterheld
patent: 2266253 (1941-01-01), Osterheld
patent: 4381075 (1983-04-01), Cargill et al.
patent: 4470541 (1984-09-01), Raleigh
patent: 4850310 (1989-07-01), Wildgen

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