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US 4,052,001 AGranted
Heating system
AssigneeInterliz Anstalt
InventorAlfred Vogt
Life of this patent
Estimating the term…
Abstract
The water for a central heating system is supplied with thermal energy in a boiler equipped with an oil burner and with a thermostatically controlled mixing valve that mixes the water heated in the boiler with water from a return line by-passing the boiler to maintain a desired temperature in the heating fluid. A secondary heat source (heat pump, wood-burning boiler, solar unit) is connected to the by-pass and automatically actuated when it can effectively relieve the oil burning boiler.
Claims9
A heating system comprising:
- a. first heating means for supplying thermal energy to a fluid to be heated;
- b. a return line and a discharge line respectively connected to said heating means for feeding thereto the fluid to be heated and for withdrawing the heated fluid therefrom;
- c. a mixing valve in said discharge line;
- d. a three way valve having a first, a second, and a third port;
- e. a by-pass line connecting said return line to said mixing valve, respective portions of said by-pass line connecting said return line to said first port and said second port to said mixing valve;
- f. second heating means for supplying thermal energy to said fluid;
- and
- g. an intake line and an output line connected to said second heating means for feeding thereto the fluid to be heated and for withdrawing the heated fluid therefrom, one of said intake and output lines communicating permanently with one of said first and second ports, and the other one of said intake and output lines communicating permanently with said third port.
5 more elements
Dependencies are inferred from the claim text.