Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1985-07-11
1987-08-18
Bennet, Henry A.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
237 81, 622386, G05D 2300
Patent
active
046871330
DESCRIPTION:
BRIEF SUMMARY
As is well known, conventional heating plants for heating rooms or buildings and production of tappable hot water, which plants are operated by means of a boiler heated with a fossil fuel such as oil, gas or the like, have considerable drawbacks due to the fact that a substantial portion of the supplied energy is wasted by heat losses with the flue gases escaping through the chimney. In order to improve the economy of the heating people have begun to use heat pumps which raise heat of low temperature to a higher temperature level. The most usual source of heat in this connection is air, both outdoor air and indoor air. When using outdoor air, the drawback is incurred that the efficiency of the heat pump falls drastically at low temperatures, such as lower than -5.degree. C., for example, at which temperature there also arise problems associated with frost deposition on the aggregate. Therefore, in connection with heat pumps operating with outdoor air, another source of heat must be provided, such as an oil-fired boiler or an electric boiler, which is operative during the coldest season.
Return air is a profitable source of heat in such adaptions where a great portion of the air usually is vented out, and, when a heat pump is used, is recycled via the heat pump.
When using outdoor air as a source of heat, attempts have been made to meet the heat demand by means of solely a heat pump, but the measures which must be adopted in this connection for ensuring the operation of the heat pump at low outdoor temperatures, result in the construction of the heat pump being complicated, so that the heat pump becomes expensive both in installation and maintenance. There exist, for example, heat pumps running multi-stepwise to raise the temperature of the air with each step.
The present invention has for its object to provide a method for operation of a heating plant as well as a heating plant for realization of the method, where the above-mentioned drawbacks inherent to the solutions known hitherto are eliminated and a heating plant is accomplished which affords extraordinary operational economy, while at the same time the function and high efficiency of the plant are ensured at all outdoor temperatures.
This object is attained by the method and the heating plant having been given the characterizing features stated in the subsequent claims.
The invention will be described more specifically with reference to the attached drawing.
FIG. 1 shows in a diagrammatic manner a cross-section through a heating plant according to the invention.
FIG. 2 shows a principal diagram of the heat pump forming part of the heating plant shown in FIG. 1.
In the heating plant shown in FIG. 1 reference numeral 1 denotes a burner for oil or gas which is disposed in a water-carried boiler 2, to which a tank or space 13 for production of hot water is connected. The boiler 2 and the tank 13 are positioned on a support 11. Disposed within the space above the boiler 2 and the tank 13, which space constitutes an air channel 3, are a heat exchanger 4 of the cross-flow type and a heat pump 5 for air circulation. Disposed above the heat exchanger 4 is an exhaust chamber 6 equipped with a suction fan 7 connected to an exhaust tube 9 for consumed air or flue gases, respectively, as will be described below. Reference numeral 8 denotes a space containing control equipment for the heating boiler. The entire heating plant is located in a closed boiler room 10.
Connected to the heat exchanger 4 are an intake channel 12 coming from outside for fresh air and an inlet opening 14 for return air from the boiler room 10, which return air circulates in the plant through the heat exchanger 4 and the heat pump 5, as will be described hereinafter. The heat pump 5 has an inlet or intake opening 5' and an exhaust opening 15 for receipt and discharge of the mixture of fresh air and return air circulating therethrough. Reference numeral 16 denotes an intake opening for supply of air from the boiler room 10 to the air channel 3. Opening into the air channel 3 is also an exhaus
REFERENCES:
patent: 4141490 (1979-02-01), Franchina
patent: 4452620 (1984-06-01), Dosmond
patent: 4523438 (1985-06-01), Corti
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