Boiling heat transfer device

A boiling heat transfer device comprising:

• a heat receiving portion that boils a liquefied refrigerant to convert it to vapor, and contacts with a device to be cooled and cools the device to be cooled;
• a vapor tube that conveys the vapor generated by the heat receiving portion;
• a heat dissipating portion that condenses the vapor conveyed from the vapor tube to convert it to a liquefied refrigerant and dissipates heat to an atmosphere;
• and
• a liquid tube that returns to the heat receiving portion the liquefied refrigerant condensed by the heat dissipating portion,
• the vapor tube being drawn out from the heat receiving portion side in a parallel direction to a direction of gravity, and being bent in a direction close to horizontal toward the heat dissipating portion.

A boiling heat transfer device comprising:

• a heat receiving portion that boils a liquefied refrigerant to convert it to vapor, and contacts with a device to be cooled and cools the device to be cooled;
• a vapor tube that conveys the vapor generated by the heat receiving portion;
• a heat dissipating portion that condenses the vapor conveyed from the vapor tube to convert it to a liquefied refrigerant and dissipates heat to an atmosphere;
• and
• a liquid tube that returns to the heat receiving portion the liquefied refrigerant condensed by the heat dissipating portion,
• height of a liquid surface of the liquefied refrigerant in the heat receiving portion being higher than height of a bottom surface of the heat dissipating portion.