Heating systems – Automatic control – Car
Patent
1982-05-17
1984-11-06
Bennett, Henry
Heating systems
Automatic control
Car
237 67, 237 59, 237 74, B60H 100
Patent
active
044807856
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the regulated transfer of heat from a primary steam network to a heat consumer, the supply flow of which is at a predetermined overpressure and the return flow of which is at a relatively lower pressure. The steam withdrawn from the steam network in accordance with the heat consumption on the part of the heat consumer is cooled down to the point of condensation by the withdrawal of heat by a secondary medium, while a predetermined overpressure relative to the supply pressure of the heat consumer is maintained. The overpressure is then reduced in a jet pump to the supply pressure of the heat consumer, generating a corresponding driving or pumping force for the supply flow, and secondary medium which has been heated in the course of the cooling down of the steam is then added to the supply flow.
The invention further relates to an apparatus for the regulated transfer of heat from a primary steam network to a heat consumer, having a heat exchanger regulated by the accumulation of condensate in accordance with the temperature at the heat consumer. The heat exchanger is connected on the steam side with the steam network and on the condensate side with the injection nozzle of a jet pump located in the supply conduit of the heat consumer. The injection nozzle of the jet pump is exposed to the condensate, which is at a predetermined overpressure, and on the intake side the jet pump is located in a secondary circuit of the heat exchanger in which secondary medium heated by the steam is flowing; the secondary medium can be admixed with the supply to the heat consumer in a predetermined proportion.
Background
In an older method and an older apparatus to carryout such a method, the heat exchanger is connected via a multiple-function valve to the steam line of the primary steam network. The pipe coils for condensation in the heat exchanger are connected to the injection or propulsion nozzle of a jet pump, and a line which serves as the supply conduit leads from the jet pump to the heat consumer, the return flow of which discharges via a pressure maintenance valve into the condensate return line of the primary steam network. After the heat consumer in the direction of flow, but before the pressure maintenance valve, a line branches off with the secondary medium is diverted from the condensate which is to be returned, and this secondary medium is fed into the associated supply connection of the heat exchanger.
Once the secondary medium in the heat exchanger has been heated by the condensation of the steam, it passes through a further connecting line to the intake side of the jet pump; from there, it is then added to the condensate flowing out of the heat exchanger in order to transfer heat to the heat consumer.
The regulation of the temperature of the supply of the heat consumer is effected via the multiple-function valve provided on the steam side, by way of which the condensate accumulation in the heat exchanger is also regulated at the same time.
There is a pressure loss at the multiple-function valve. Under certain operating conditions it is then necessary to provide a pressure-elevating pump in the supply conduit for the heat consumer following the jet pump. The pressure-elevating pump being electrically operated.
The Invention
It is an object to improve the method discussed above in such a manner that on the one hand, fewer plumbing fixtures are required and on the other, it is not necessary to provide a pressure-elevating pump following the jet pump.
Briefly, the temperature of the secondary medium being supplied to the heat consumer is sensed and the injection nozzle of the jet jump is then so controlled, as a function of temperature, that the jet pump pumps or supplies more or less of a mixture of secondary medium condensate from the steam supply, at over pressure, as required in order to regulate the temperature at the heat consumer in accordance with a predetermined level.
Preferably, the supply flow of the secondary medium, which is supplied to the heat exchanger an
REFERENCES:
patent: 1065568 (1913-06-01), Ward
patent: 2789770 (1957-04-01), Hans-Martin Pape
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