A semiconductor memory device comprises memory cells, a bitline connected to the memory cells, a read circuit including a precharge circuit, and a first transistor connected between the bitline and the read circuit, wherein a first voltage is applied to a gate of the first transistor when the precharge circuit precharges the bitline, and a second voltage which is different from the first voltage is applied to the gate of the first transistor when the read circuit senses a change in a voltage of the bitline.

Semiconductor memory device.

A heat pipe with micro tubes (2), comprised of a solid heat conductor (1) provided therein with two or more parallel micro tubes (2), the micro tubes being filled therein with working medium which exchanges heat through phrase change; and the two ends of the heat conductor (1) are sealed and at least one of them is provided with a sealing strip of gradually shrinking shape that is formed from cold welding. A manufacturing process for the heat pipe and a heat-exchange system comprised of the heat pipe.

Heat pipe with micro-pore tubes array and making method thereof and heat exchanging system

A method for removing heat from a heat generating component using a low profile extrusion with a plurality of micro tubes extended there through. The low profile extrusion is placed into thermal connection with heat producing components. A heat transfer fluid removes heat via an adiabatic process.

Cooling apparatus having low profile extrusion and method of manufacture therefor

A cooling system for removing heat from at least one heat generating component with a first low-profile phase plane heat pipe having a geometrically reoriented surface adapted for receiving heat from the at least one heat generating component along a first section of the geometrically reoriented surface, and having a plurality of micro-tubes disposed therein. A heat transfer fluid is contained with the plurality of micro-tubes and a second section of the geometrically reoriented heat pipe surface is disposed in a position geometrically offset from the first section.

Geometrically reoriented low-profile phase plane heat pipes

A solar water heater comprising at least one casing having housed therein a heat collector of the heat pipe type having a condenser portion and a heat receiving tank for receiving heat from the condenser portion of the collector, and a hot water tank disposed outside the casing The heat receiving tank is in communication with the hot water tank by a supply pipe and a return pipe to heat water in the hot water tank with the heat of a liquid within the heat receiving tank

Solar water heater

A heat-pipe type solar collector comprises as its principal portion a plurality of heat pipes arranged in parallel with each other and having vaporizing portions and condensing portions, and a plurality of heat collector plates traversing the heat pipes and arranged in parallel with each other, the vaporizing portion of each heat pipe penetrating through and fixedly mounted to the collector plates in intimate heat conductive relation therewith, and each collector plate having a lower portion bent substantially perpendicular to the remaining portion to cover a space between itself and an adjacent collector plate. According to this arrangement, solar heat can be effectively collected by the collector plates and transmitted to the heat pipes with a negligible heat loss. Thus the heat collecting efficiency of the water heater can be remarkably enhanced.

Heat-pipe type solar water heater

PURPOSE:To improve the heat exchange efficiency of the heat pipe with respect to water in a hot water storage tank by a method wherein the hot water storage tank of a large capacity is divided into a plurality of sub-tanks of small capacity so that the heat exchange between a condensing section of the heat pipe and the water is performed within the sub-tanks. CONSTITUTION:The sunlight passed through a glass body 10 boils an operating liquid at an evaporation section 3a within the heat pipe 3. In this case, the latent heat of evaporation of the operating liquid is adsorbed at the evaporation section 3a and is discharged at the condensing section 3b to thereby heat the water 5 in the sub-tanks 11. Thus, when the water 5 in the sub-tanks is heated to a high temperature, the specific gravity of the water becomes small so that the water flows into the hot water storage tank 2 from a forward pipe 13 and an inlet port 15 through a hose 17 due to a convection phenomenon. At the same time, the low temperature hot water in the tank 2 passes through a hose 18 from an outlet port 6 and flows into the sub-tanks 11 from a return port 14.

Heat pipe type solar heat water heater

PURPOSE:To enable to secure a high heat transferring performance by a method wherein the heat pipe is constituted so as to form the enclosed loop by communicating an upper header tube with one end of a condensing part and the lower header tube with the other end of the condensing part. CONSTITUTION:The evaporating part 4 of a loop type heat pipe 3 is accommodated on an insulating member 2 at the bottom of a solar heat collector 1 and the condensing part 6 of the pipe 3 is arranged in a heat exchange tank 5 while the evaporating part 4 is constituted by an upper header tube 7, a lower header tube 8 and a pipe 10 communicating both tubes and equipped with a heat collecting panel 9. When the amount of sunshine is much, an operating liquid in the pipe 10 is boiled and evaporated violently and two phases current of vapor and liquid are ascended violently through the pipe 10, but the operating liquid 13 is supplied stably into the pipe 10, therefore, the high heat transferring performance may be secured without dry-out. On the other hand, when the amount of sunshine is less, the evaporating amount of the operating liquid 13 becomes less and the liquid 13 is supplied uniformly into the pipe 10 from the lower header tube 8.

Loop type heat pipe system solar heat water heater

CHAUFFE-EAU SOLAIRE QUI COMPREND UN CERTAIN NOMBRE DE CONDUITS DE CHALEUR DISPOSES EN PARALLELE ET COMPORTANT DES PARTIES DE VAPORISATION 7 ET DES PARTIES DE CONDENSATION 9, ET UN CERTAIN NOMBRE DE PLAQUES COLLECTRICES 2 QUE TRAVERSENT LES CONDUITS DE CHALEUR 1 ET QUI SONT DISPOSEES EN PARALLELE, LA PARTIE DE VAPORISATION 7 DE CHAQUE CONDUIT DE CHALEUR 1 TRAVERSANT ET ETANT MONTEE FIXEMENT DANS LES PLAQUES COLLECTRICES 2, EN ETROIT CONTACT DE CONDUCTION DE CHALEUR, CHAQUE PLAQUE COLLECTRICE 2 COMPORTANT UNE PARTIE INFERIEURE PLIEE 2 QUI EST PRATIQUEMENT PERPENDICULAIRE A SA PARTIE RESTANTE DE FACON A COUVRIR L'ESPACE COMPRIS ENTRE ELLE-MEME ET LA PLAQUE COLLECTRICE 2 ADJACENTE. GRACE A CETTE DISPOSITION, LA CHALEUR SOLAIRE PEUT ETRE EFFICACEMENT RECUEILLIE PAR LES PLAQUES COLLECTRICES ET PEUT ETRE TRANSMISE AUX CONDUITS DE CHALEUR AVEC DES PERTES NEGLIGEABLES. DANS CES CONDITIONS, L'EFFICACITE DU CHAUFFE-EAU SOLAIRE EST SENSIBLEMENT AUGMENTEE.

Soichi Kitajima

Papers

Heat-pipe type solar water heater

Heat pipe type solar heat water heater

Loop type heat pipe system solar heat water heater

Chauffe-eau solaire a conduits de chaleur