Refrigeration – Diverse systems – e.g. – ice and mechanical – Primary and secondary dependent circuits
Patent
1980-04-28
1982-09-21
Davis, Albert W.
Refrigeration
Diverse systems, e.g., ice and mechanical
Primary and secondary dependent circuits
16510425, 16510433, 357 82, 361385, F25D 1700, H01L 2344
Patent
active
043500269
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention refers to a cooling device for electrical and/or electronic component elements producing lost heat, in particular for electrical semiconductor component elements, with a coolant cycle in which there is a forced air ventilation thermal exchange mechanism for the recooling of the coolant.
This invention also refers to a procedure for operating the above-described cooling device.
DESCRIPTION OF THE PRIOR ART
Water or oil functions as the coolant for direct fluid cooling of the semiconductor component elements in a familiar cooling device of the above-mentioned type (Siemens Magazine 44 (1970), Vol. 1, pages 39 to 43).
In this way the heated coolant fluid can be recooled by means of a forced air ventilation thermal exchange mechanism or by means of a second fluid cycle. Water cooling is more effective than oil cooling; yet even chemically pure water tries to introduce ions from the surrounding substances into the solution so that an exchange of ions is necessary in order to maintain a certain insulating capacity of the water.
When cooling electrical semiconductor elements, for example current director valves, with coolant cycles and forced air ventilated thermal exchange mechanisms, water and oil are commonly used as primary coolants but with certain disadvantage, namely low insulating capacity along with practically unavoidable impurities in water and a reduction in the insulating capacity in conductors outside of the coolant due to the collection of dust at oil leakage sites. Other, essentially suitable coolants would require an inefficient enlargement of the thermal exchange mechanism.
Furthermore, water freezes at below 273 K. In case of any leakage, insulating transformer oil induces the collection of dust and can, therefore, lead to a negative influence on the electrical voltage strength. This danger also exists when silicon oil is used.
SUMMARY OF THE INVENTION
Accordingly, one object of this invention is to provide a novel cooling device of the above-mentioned type in such a way that inert-like fluids, for example derivatives of methane or of ethane in appropriate compounds, can be used as coolants without necessitating an enlargement in the thermal exchange mechanism.
This object is achieved in accordance with the discovery by providing a novel cooling system in which, the coolant cycle flows through the vaporizer of a coolant cycle system. Therefore, a portion of the heat can be advantageously derived, as is common, from the forced air ventilated thermal exchange mechanism and the other part from the cooling system.
The invention solves the problems of the prior art by means of a secondary coolant cycle with a vaporizer, through which the primary coolant cycle is channeled, in addition to the forced air ventilated thermal exchange unit. Thereby, a part of the released heat is removed from the thermal exchange unit and the rest is removed by the vaporizer and the secondary coolant cycle. That is when using specially suitable primary coolants such as inert-like fluids, an enlargement of the thermal exchange mechanism can be avoided. For this purpose, the condenser of the secondary cycle is connected to the thermal exchange unit.
Preferably, the condenser of the coolant cycle system is built into the forced air ventilated thermal exchange mechanism of the coolant cycle with which it does not have to work as hard and smaller dimensions of the thermal exchange mechanism are possible.
Another object of the invention is to provide a method for operating the cooling device with which the cooling process can be designed especially efficient.
This object is achieved by using a coolant, the boiling point of which is somewhat lower than the contact temperature of the element to be cooled for the purpose of combined convection and boiling cooling, and channeling a portion of the lost heat to the vaporizer of the cooling system only above a pre-determined surrounding temperature.
The heat is derived primarily by means of convection in the above-described, familiar fluid
REFERENCES:
patent: 3371298 (1968-02-01), Narbut
patent: 3656540 (1972-04-01), Henrici
patent: 3818983 (1974-06-01), Grandia
BBC Brown Boveri & Company Limited
Davis Albert W.
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