Temperature actuated capillary valve for loop heat pipe system
First Claim
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1. A temperature-actuated capillary flow valve for use in a two phase heat transfer system, the valve comprising:
- inlet port for receiving working fluid in a vapor-phase;
an outlet port; and
a housing extending between the inlet port and the outlet port, the housing defining a flow passage,the inlet port and the outlet ports being aligned along a central longitudinal axis of the housing; and
a porous wick having a cylindrical shape with a first, open, end facing the outlet port and a second , closed , end formed of the porous wick material extending across the flow passage and facing the inlet port,an inner surface of the cylindrical shape of the porous wick material and an inner surface of the second, closed, end of the porous wick material defining a cylindrical volume open to the outlet port and separated from the inlet port by the closed end,the housing configured to be heated by a heat source to evaporate liquid-phase working fluid from the wick and allow the vapor-phase working fluid to pass through the porous wick material to the outlet port, wherein removal of the heat source allows liquid to condense in the porous wick material, thereby preventing flow of the vapor-phase working fluid through the porous wick material to the outlet port.
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Abstract
A capillary flow valve for use in a two phase heat transfer system such as a loop heat pipe, including an inlet port for receiving working fluid in a vapor-phase, an outlet port for outputting working fluid in a vapor-phase, and a porous wick material extending across the interior of the valve. Heating the wick evaporates liquid-phase working fluid from the wick and allows the vapor-phase working fluid to pass through the wick to the outlet port. Removing the heat allows liquid to condense in the wick, preventing flow of the vapor-phase working fluid through the wick to the outlet port.
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Citations
16 Claims
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1. A temperature-actuated capillary flow valve for use in a two phase heat transfer system, the valve comprising:
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inlet port for receiving working fluid in a vapor-phase; an outlet port; and a housing extending between the inlet port and the outlet port, the housing defining a flow passage, the inlet port and the outlet ports being aligned along a central longitudinal axis of the housing; and a porous wick having a cylindrical shape with a first, open, end facing the outlet port and a second , closed , end formed of the porous wick material extending across the flow passage and facing the inlet port, an inner surface of the cylindrical shape of the porous wick material and an inner surface of the second, closed, end of the porous wick material defining a cylindrical volume open to the outlet port and separated from the inlet port by the closed end, the housing configured to be heated by a heat source to evaporate liquid-phase working fluid from the wick and allow the vapor-phase working fluid to pass through the porous wick material to the outlet port, wherein removal of the heat source allows liquid to condense in the porous wick material, thereby preventing flow of the vapor-phase working fluid through the porous wick material to the outlet port. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling the flow of vapor-phase working fluid through a temperature-actuated capillary flow valve into a condenser in a two-phase heat transfer system having a working fluid with a liquid-phase and a vapor-phase, comprising:
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providing the temperature-actuated capillary flow valve having an inlet port for receiving working fluid in a vapor-phase, an outlet port, a housing extending between the inlet port and the outlet port, the housing defining a flow passage, the inlet port and the outlet ports being aligned along a central longitudinal axis of the housing, and a porous wick material within the housing and having a cylindrical shape with a first, open end facing the outlet port and a second, closed end formed of the porous wick material extending across the flow passage and facing the inlet port, wherein an inner surface of the cylindrical shape of the porous wick material and an inner surface of the second, closed, end of the porous wick material define a cylindrical volume open to the outlet port and separated from the inlet port by the closed end; introducing the vapor-phase working fluid into the inlet port and controlling flow of the vapor-phase working fluid through the capillary flow valve by heating the housing to evaporate liquid-phase working fluid from the wick and allow the vapor-phase working fluid to pass from the inlet port through the porous wick material to the outlet port, or by removing a heat source to allow the vapor-phase working fluid in the porous wick material to condense and prevent flow of the vapor-phase working fluid from the inlet port through the porous wick material to the outlet port. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification