The present invention discloses a defrosting device, including: a heating unit provided at a lower portion of the evaporator; and a heat pipe connected to an inlet and an outlet of the heating unit, respectively, and having at least part thereof disposed adjacent to a cooling pipe of the evaporator such that the cooling pipe of the evaporator is heated by a working fluid of high temperature which is transferred in a heated state by the heating unit, wherein the heating unit includes: a heater case extending in one direction to be arranged in a left and right direction of the evaporator, and having the inlet and the outlet at both sides thereof; and a heater provided with an active heating part accommodated within the heater case and actively generating heat to heat the working fluid, and a passive heating part extending from the active heating part and heated up to temperature lower than temperature of the active heating part, and wherein the inlet is formed at a position away from the active heating part to prevent the working fluid returned after flowing along the heat pipe from being introduced directly into the active heating part.

A heat exchanger to which a fan supplies air includes a plurality of flat tubes extending in a first direction, a corrugated fin connected to the flat tubes and extending in a second direction intersecting the first direction, and a plurality of plate fins connected to at least one of a windward end and a leeward end of the corrugated fin and extending in a third direction intersecting the second direction. This configuration achieves improvement in heat exchange performance.

The present invention provides a composite server heat sink with a metal base having a thermal conductivity of at least 200 W/mK. Plural fins extend from the metal base, each fin having an anisotropic thermal conductivity in a range of approximately 300 to 650 W/mK in a longitudinal direction of the fin and less than approximately 30 W/mK in a widthwise direction of the fin. Each fin includes graphite in an amount of approximately 45-70 wt. %, diamond in an amount of approximately 2.5 to 10 wt. % with the balance comprising a metal selected from one or more of copper and aluminum. To create the anisotropic thermal properties, the graphite is aligned along the longitudinal direction of the fin.

A heat exchanger is disclosed. The heat exchanger includes a hollow tube extending from a tube inlet to a tube outlet. The hollow tube includes a wall that includes a core of a first aluminum alloy, and a cladding over the core of a second aluminum alloy. The second aluminum alloy is less noble than the first aluminum alloy and includes an alloying element selected from tin, indium, or gallium, or combinations thereof. A first fluid flow path is disposed along an inner surface of the wall from the tube inlet to the tube outlet, and a second fluid flow path is disposed across an outer surface of the wall.

A heat exchanger is disclosed. The heat exchanger includes a hollow tube including a first aluminum alloy extending along an axis from a tube inlet to tube outlet. A first plurality of fins including a second aluminum alloy extends outwardly from an outer surface of the tube. A second plurality of fins including a third aluminum alloy extends outwardly from the outer surface of the tube, interspersed along the axis with the fins including the second aluminum alloy. The third aluminum alloy is less noble than each of the first aluminum alloy and the second aluminum alloy, and includes an alloying element selected from tin, indium, gallium, or combinations thereof. A first fluid flow path is disposed through hollow tube from the tube inlet to the tube outlet. A second fluid flow path is disposed across an outer surface of the hollow tube through spaces between adjacent fins.

A heat dissipation module is configured to dissipate heat generated by at least one heating element of a projection device. The heat dissipation module includes at least one first heat pipe, at least one second heat pipe and a heat dissipation fin assembly. The first heat pipe includes a first section connected to the heating element and a second section. The second heat pipe includes a third section connected to the heating element and a fourth section. The length of the first heat pipe is less than that of the second heat pipe. The heat dissipation fin assembly includes a plurality of heat dissipation fins. The second section and the fourth section pass through the heat dissipation fin assembly, and the number of heat dissipation fins through which the second section passes is 70% or below of the number of heat dissipation fins through which the fourth section passes.

A two-phase immersion-type heat dissipation structure having fins with different thermal conductivities is provided. The two-phase immersion-type heat dissipation structure includes a heat dissipation substrate, and a plurality of fins. The heat dissipation substrate has a fin surface and a non-fin surface that face away from each other. The non-fin surface is configured to be in contact with a heating element immersed in a two-phase coolant. The fin surface is connected with the plurality of fins. At least one of the plurality of fins is a functional fin that is made of a single metal material and has two or more thermal conductivities. A thermal conductivity of a lower portion of the functional fin that is connected with the heat dissipation substrate is lower than thermal conductivities of other portions of the functional fin.

A heat sink with a primary flow volume, an inlet, an outlet, a bottom plate, a top plate, distribution, heat transfer and collector sections, and flow paths between pillars. The inlet cross-section defines the primary flow volume cross-section and the length of the primary flow volume extends into the heat sink at a right angle to the inlet cross-section. The distribution section is proximate to the flow inlet and has distribution pillars extending from the bottom or top plate. The heat transfer section is proximate to the distribution section and has heat transfer pillars extending from the bottom or top plate. The collector section is proximate to the heat transfer section and has collector pillars extending from the bottom or top plate. The distribution cross-section is greater than the heat transfer cross-section which is smaller than the collector cross-section. The outlet and the flow paths extend outside of the primary flow volume.

A heat sink with a primary flow volume, an inlet, an outlet, a bottom plate, a top plate, distribution, heat transfer and collector sections, and flow paths between pillars. The inlet cross-section defines the primary flow volume cross-section and the length of the primary flow volume extends into the heat sink at a right angle to the inlet cross-section. The distribution section is proximate to the flow inlet and has distribution pillars extending from the bottom or top plate. The heat transfer section is proximate to the distribution section and has heat transfer pillars extending from the bottom or top plate. The collector section is proximate to the heat transfer section and has collector pillars extending from the bottom or top plate. The distribution cross-section is greater than the heat transfer cross-section which is smaller than the collector cross-section. The flow paths extend outside of the primary flow volume.

A heat exchanger can be configured to utilize multiple sections of hardway fins that can be configured so that an upper first section of the fins can build up liquid head and a second lower section of the fins can be configured to distribute liquid in an even, or uniform, manner. The first section of fins can utilize a different type of hole arrangement than the second section of fins. For instance, the diameter or width of the holes in the first section may differ from the diameter or width of the holes of the second section. In addition (or as an alternative), fin frequency and/or spacing between immediately adjacent holes in the first section of fins may be different from the spacing between immediately adjacent holes in the second section of fins.