Abstract: A vapor-lift pump heat transport apparatus having a small heat resistance and a large heat transport capacity. A heat exchange circulating solution container has a first space and a second space communicating with the first space through a communication opening and contains a heat exchange circulating solution, and vapor thereof, in each space. A circulating solution transport passage includes a pipe connected to the solution outlet of the container and provided with a sensible heat releasing heat exchanger, a pipe disposed in the container, and a pipe connected to a vapor-liquid two-phase fluid inlet and provided with a heating heat exchanger. A vapor-liquid two-phase fluid flows into only the first space through the vapor-liquid two-phase fluid inlet. When the entrance of the vapor-liquid two-phase fluid has caused a pressure difference between the first and second spaces, a difference occurs between the positions of the vapor-liquid interfaces in the first and second spaces.

Abstract: A vapor-lift pump heat transport apparatus having a small heat resistance and a large heat transport capacity. A heat exchange circulating solution container has a first space and a second space communicating with the first space through a communication opening and contains a heat exchange circulating solution, and vapor thereof, in each space A circulating solution transport passage includes a pipe connected to the solution outlet of the container and provided with a sensible heat releasing heat exchanger, a pipe disposed in the container, and a pipe connected to a vapor-liquid two-phase fluid inlet and provided with a heating heat exchanger. A vapor-liquid two-phase fluid flows into only the first space through the vapor-liquid two-phase fluid inlet. When the entrance of the vapor-liquid two-phase fluid has caused a pressure difference between the first and second spaces, a difference occurs between the positions of the vapor-liquid interfaces in the first and second spaces.

Abstract: An evaporator includes a container, a wick provided in contact with an inner peripheral surface of said container and formed such that (1) if the number of pores per unit volume is fixed, the diameter of pores is varied, or (2) if the diameters of pores are formed substantially uniformly, the number of pores is varied, a sump having said wick as its inner wall surface and connected to a liquid pipe for supplying a liquid-phase working fluid, and a vapor channel formed in a contact surface of said container with respect to said wick so as to guide a gas-phase working fluid into a vapor pipe connected to an end portion of said container.

Abstract: A heat exchanger for oil from a machine, and particularly from the main spindle system of a machine tool comprises a heat pipe having a heat absorbing portion which is immersed in an oil tank and a heat dissipating portion which is disposed outside the oil tank. An oil guide surrounds the heat absorbing portion and guides hot oil from the machine tool past the heat absorbing portion. A working fluid sealed inside the heat pipe cools the hot oil by evaporation and dissipates the heat to the surrounding air. An oil weir may be disposed at one end of the oil guide so as to maintain an adequate level of oil in the oil guide when the oil level in the oil tank is below the bottom of the heat pipe.