Abstract: A cooling unit positioned between a first and a second gas stream, the first and the second gas stream having no direct fluid contact therebetween. The cooling unit includes a double-sided heat exchanger with a first side that is in thermal communication with the first gas stream and a second side that is in thermal communication with the second gas stream. The double-sided heat exchanger provides a direct path of thermal conduction between the first gas stream and the second gas stream. First fins are provided on the first side of the double-sided heat exchanger and second fins are provided on the second side of the double-sided heat exchanger. A first surface area of the first side of the double-sided heat exchanger is at least 5% greater than a second surface area of the second side of the double-sided heat exchanger. A housing surrounds a fan and the second fins.

Abstract: A cooling unit positioned between a first gas stream and a second gas stream, the first gas stream and the second gas stream having no direct fluid contact therebetween. The cooling unit includes a double-sided heat exchanger with a first side that is in thermal communication with the first gas stream and a second side that is in thermal communication with the second gas stream. The double-sided heat exchanger provides a direct path of thermal conduction between the first gas stream and the second gas stream. First fins are provided on the first side of the double-sided heat exchanger and second fins are provided on the second side of the double-sided heat exchanger. A first surface area of the first side of the double-sided heat exchanger is at least 5% greater than a second surface area of the second side of the double-sided heat exchanger.

Abstract: A thermally actuated heat pipe control valve including a housing, a phase change material actuator, and a passage closing member. A passage extends through the housing and is configured to receive working fluid from the heat pipe therein. The phase change material actuator is positioned in the housing and has a sealed chamber with phase change material positioned therein. The passage closing member is positioned in the housing proximate to or in the passage and proximate to the phase change material actuator. The passage closing member has a surface which cooperates with a wall of the passage. As the temperature of the phase change material reaches a designed temperature, the phase change material melts and expands causing the passage closing member to move into the passage to a closed position, preventing heat transfer between the condenser portion and the evaporator portion when the designed temperature is reached or exceeded.

Abstract: A heat exchanger and method which is able to perform in different seasons. The heat exchanger has an upper header and a lower header. Multiple heat pipes extend between the upper header and the lower header, with each of the multiple heat pipes having an evaporator section at one end and a condenser section at the opposite end. The direction of heat flow through the multiple heat pipes is variable depending on ambient air conditions applied to the heat exchanger. A pump is provided in fluid communication with the upper header and the lower header. The pump operates when the heat exchanger is operating in a second mode in which the evaporator section is located above the condenser section, and the pump is disabled when the heat exchanger is operating in a first mode in which the condenser section is located above the evaporator section.

Abstract: A thermally actuated heat pipe control valve which includes a housing having a first opening for receiving a condenser portion of a heat pipe therein, a second opening for receiving an evaporator portion of the heat pipe therein and a passage extending through the housing from the first opening to the second opening. The passage is configured to receive working fluid from the heat pipe therein. A passage closing member is positioned in the housing proximate to or in the passage. The passage closing member having a surface which cooperates with a wall of the passage. At a specific temperature, the passage closing member moves into the passage to a closed position, preventing the flow of the working fluid, thereby preventing heat transfer between the condenser portion and the evaporator portion when the design temperature is reached or exceeded.

Abstract: A heat pipe with superior heat transfer between the heat pipe and the heat source and heat sink. The heat pipe is held tightly against the heat source by mounting holes which penetrate the structure of the heat pipe but are sealed off from the vapor chamber because they each are located within a sealed structure such as a pillar or the solid layers of the casing surrounding the vapor chamber. Another feature of the heat pipe is the use of more highly heat conductive material for only that part of the wick in the region which contacts the heat source, so that there is superior heat conductivity in that region.

Abstract: The apparatus is a heat pipe with superior heat transfer between the heat pipe and the heat source and heat sink. The heat pipe is held tightly against the heat source by mounting holes which penetrate the structure of the heat pipe but are sealed off from the vapor chamber because they each are located within a sealed structure such as a pillar or the solid layers of the casing surrounding the vapor chamber. Another feature of the heat pipe is the use of more highly heat conductive material for only that part of the wick in the region which contacts the heat source, so that there is superior heat conductivity in that region.

Abstract: A heat pipe with superior heat transfer between the heat pipe and the heat source and heat sink is provided. The heat pipe is held tightly against the heat source by mounting holes which penetrate the structure of the heat pipe but are sealed off from the vapor chamber because they each are located within a sealed structure such as a pillar or the solid layers of the casing surrounding the vapor chamber. Another feature of the heat pipe is the use of a plurality of particles joined together by a brazing compound such that fillets of the brazing compound are formed between adjacent ones of the plurality of particles so as to form a network of capillary passageways between the particles of the wick.

Abstract: A heat pipe with superior heat transfer between the heat pipe and the heat source and heat sink is provided. The heat pipe is held tightly against the heat source by mounting holes which penetrate the structure of the heat pipe but are sealed off from the vapor chamber because they each are located within a sealed structure such as a pillar or the solid layers of the casing surrounding the vapor chamber. Another feature of the heat pipe is the use of a plurality of particles joined together by a brazing compound such that fillets of the brazing compound are formed between adjacent ones of the plurality of particles so as to form a network of capillary passageways between the particles of the wick.

Abstract: The apparatus is a heat pipe with superior heat transfer between the heat pipe and the heat source and heat sink. The heat pipe is held tightly against the heat source by mounting holes which penetrate the structure of the heat pipe but are sealed off from the vapor chamber because they each are located within a sealed structure such as a pillar or the solid layers of the casing surrounding the vapor chamber. Another feature of the heat pipe is the use of more highly heat conductive material for only that part of the wick in the region which contacts the heat source, so that there is superior heat conductivity in that region.