Heating systems – Automatic control – Combined radiator and boiler
Patent
1998-07-14
1999-03-16
Bennett, Henry
Heating systems
Automatic control
Combined radiator and boiler
237 19, F24H 306
Patent
active
058819525
ABSTRACT:
A heating system is provided with a closed circuit system for a first liquid, a pass-through system for a second liquid and a controller. The closed circuit system has a primary heater with a first heat exchanger, a second heat exchanger and a circulating pump. The primary heater has a burner for burning hydrocarbon fuel and has a first heat exchanger for transferring heat from combustion products of hydrocarbon fuel to the first liquid. The second heat exchanger allows transfer of heat from the first liquid heated in the first heat exchanger to the second liquid in the pass-through system. The closed systems also has an outlet pipe connecting an outlet of the first heat exchanger to an inlet of the second heat exchanger, and an inlet pipe connecting an inlet of the first heat exchanger to an outlet of the second heat exchanger. The pass-through system has a storage tank, a recirculating tube system with recirculating pump, a main second liquid supply, a withdrawal tube and a fast response temperature sensor. The recirculating tube connects an inlet to an outlet of the storage tank via the second heat exchanger. The withdrawal tube is connected to the recirculating tube, for withdrawal of hot liquid from the pass-through system. The main second liquid supply line is connected to the recirculating tube upstream of the second heat exchanger. The temperature sensor is for sensing the temperature of second liquid in the recirculating tube between the main supply line and the second heat exchanger. The controller has means for detecting a substantial temperature drop caused by an in-flow of second liquid from the main supply line, as sensed by the temperature sensor, and has means for causing the hydrocarbon fuel to be burnt in order to heat the first liquid in the first heat exchanger.
REFERENCES:
patent: 4848655 (1989-07-01), Woodin et al.
patent: 5772113 (1998-06-01), Gerstmann et al.
Bales Derek S.
Bennett Henry
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