System for dissipating heat energy generated by an electronic component and sealed enclosure used in a system of this kind
First Claim
1. A system for dissipating heat energy generated by an electronic component comprising a sealed metal enclosure the interior volume of which contains a liquid having a phase change temperature at atmospheric pressure, said component being fixed to the outside wall of said enclosure and connected to a heat dissipator by said enclosure,characterized in that the phase change temperature of said liquid at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure also contains a volume of a gas, said gas not being a vapor of said liquid and being only a gas at atmospheric pressure so that variation in the ambient temperature causes a variation in the pressure inside said enclosure which modifies the phase change temperature of said liquid, further characterized in that the ratio by which said enclosure is filled with said liquid is equal to:
- ##EQU5## with v0 =vi =v0.β
.Δ
T where;
V0 is the volume of liquid used;
v0 is the residual volume of gas inside the enclosure under initial conditions;
β
is the coefficient of thermal expansion of the liquid;
Δ
T=Ti -T0 where Ti is the maximum ambient temperature and T0 is the temperature at which the enclosure is filled;
P0 is the ambient pressure when the enclosure is filled;
Pi is the pressure inside the enclosure at temperature Ti ;
vi is the volume of the gas in the enclosure at the pressure Pi.
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Abstract
System for dissipating heat energy generated by an electronic component and sealed enclosure used in a system of this kind.
The system for dissipating heat of the invention is of the type comprising a sealed metal enclosure (21) the interior volume of which contains a fluid (22), said component (11) being fixed to the outside wall of said enclosure (21) and connected to a heat dissipator (12) by said enclosure (21) and is characterized in that the phase change temperature of the fluid (22) at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure (21) also contains a volume of gas (23) different from the fluid (22) so that variation in the ambient temperature causes a variation in the pressure inside the enclosure (21) which modifies the phase change temperature of the fluid (22).
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Citations
9 Claims
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1. A system for dissipating heat energy generated by an electronic component comprising a sealed metal enclosure the interior volume of which contains a liquid having a phase change temperature at atmospheric pressure, said component being fixed to the outside wall of said enclosure and connected to a heat dissipator by said enclosure,
characterized in that the phase change temperature of said liquid at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure also contains a volume of a gas, said gas not being a vapor of said liquid and being only a gas at atmospheric pressure so that variation in the ambient temperature causes a variation in the pressure inside said enclosure which modifies the phase change temperature of said liquid, further characterized in that the ratio by which said enclosure is filled with said liquid is equal to: - ##EQU5## with v0 =vi =v0.β
.Δ
T where;V0 is the volume of liquid used; v0 is the residual volume of gas inside the enclosure under initial conditions; β
is the coefficient of thermal expansion of the liquid;Δ
T=Ti -T0 where Ti is the maximum ambient temperature and T0 is the temperature at which the enclosure is filled;P0 is the ambient pressure when the enclosure is filled; Pi is the pressure inside the enclosure at temperature Ti ; vi is the volume of the gas in the enclosure at the pressure Pi. - View Dependent Claims (2, 3, 4, 5, 6)
- ##EQU5## with v0 =vi =v0.β
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7. A sealed metal enclosure whose interior volume contains a liquid characterized in that the phase change temperature of said liquid at atmospheric pressure is less than a given maximum ambient temperature and in that said enclosure also contains a volume of a gas at said atmospheric pressure, said gas not being a vapor of said liquid so that variation in the ambient temperature causes a variation in pressure inside said enclosure which modifies the phase change temperature of said liquid, further characterized in that the ratio by which said enclosure is filled with said liquid is equal to:
- ##EQU6## with v0 =vi +v0.β
.Δ
T where;V0 is the volume of liquid used; v0 is the residual volume of gas inside the enclosure under initial conditions; β
is the coefficient of thermal expansion of the liquid;Δ
T=Ti -T0 where Ti is the maximum ambient temperature and T0 is the temperature at which the enclosure is filled;P0 is the ambient pressure when the enclosure is filled; Pi is the pressure inside the enclosure at temperature Ti ; vi is the volume of the gas in the enclosure at the pressure Pi. - View Dependent Claims (8, 9)
- ##EQU6## with v0 =vi +v0.β
Specification