Heating systems – Automatic control – Water
Patent
1988-03-21
1989-12-05
Ford, John
Heating systems
Automatic control
Water
237 81, 236 91F, 165 1, 165 12, 165 22, 364557, F24D 302, G05D 2300
Patent
active
048847437
ABSTRACT:
A room which is substantially sealed or sealable from the surrounding atmosphere is conditioned by a plant which has a fluid heating or cooling unit, one or more heat exchangers, conduits which connect the unit with the heat exchanger(s), and a computer which is connected with sensors serving to transmit signals denoting the temperature t.sub.V of fluid in the conduit or conduits leading from the unit to the heat exchanger(s), the temperature t.sub.R of fluid in the conduit or conduits leading from the heat exchanger(s) to the unit, and the rate m of fluid flow in the conduit or conduits. These signals are used to calculate a so-called load range prevailing in the room in accordance with the equation (t.sub.V -t.sub.R).times.m. The calculated load range is compared with the load ranges of a pattern of load ranges which are characteristic of the plant, and the computer adjusts the unit or a mixing valve in the conduit or conduits leading to the heat exchangers(s) in order to change the value of t.sub.V so that the selected value of t.sub.V conforms to that which was used to calculate the equivalent load range of the pattern.
REFERENCES:
patent: 2893634 (1959-07-01), Hoffman et al.
patent: 3979710 (1976-09-01), Jespersen
patent: 4294402 (1981-10-01), Vollmer
patent: 4437164 (1984-03-01), Branch, III
patent: 4497438 (1985-02-01), Bonne
patent: 4629115 (1986-12-01), Lampert
patent: 4708287 (1987-11-01), De Wit
patent: 4718478 (1988-01-01), Huber
Ford John
Kontler Peter K.
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