Abstract: A heat exchanger for cooling is immersed in a vessel for storing heat filled with a heat-storing material of latent heat type. The heat exchanger for cooling is positioned at an upper level in the vessel when a heat-storing material having a higher specific gravity in a crystal state than in a liquid state, such as calcium chloride hexahydrate, is used, whereas at a lower level in the vessel when a heat-storing material having a lower specific gravity in a cystal state than in a liquid state such as water, is used.Crystals of a heat-storing material formed and deposited on the outer periphery of the heat exchanger for cooling when the apparatus for storing heat is in operation are accumulated in the vessel for storing heat as blocks.

Abstract: A ventilating system including a heat exchanger utilizing boiling and condensation of a liquid mounted in a cabinet formed with a first air passage and a second air passage by a partition plate extending horizontally across the heat exchanger substantially in the center thereof. At least one air sucking and exhausting fan is mounted in one of the first and second air passages, and the heat exchanger is provided with at least one auxiliary heat exchanger operative to perform space cooling or space heating. The first and second air passages are each provided with ventilating ports for effecting heat recovery, ventilating ports for effecting cooling by ventilation and a ventilating port for allowing cooled air or heated air to flow therethrough, so that the ventilating system can be operated in a heat recovery mode, a cooling by ventilation mode and a space cooling or space heating mode by actuating the auxiliary heat exchanger and suitably opening and closing various ventilating ports.

Abstract: In a control system for a brushless motor comprising a power source, a plurality of driving coils and contactless switching elements for intermittently supplying voltage across the power source to the driving coils in response to rotor position signals, rotor position signals are chopped by a chopping signal in which a ratio of a high level period to a low level period can be changed, and a portion of the contactless switching elements is driven by the chopped rotor position signals, thereby controlling the rotating speed of the brushless motor.

Abstract: A control system for an air conditioner having detectors for detecting at least the radiation temperature in a room or controlled space, a device for setting a desired room air parameter in response to the detected radiation temperature, and a controller for controlling the air conditioner in accordance with the desired room air parameter.

Abstract: A heat transfer device comprising a liquid having a low boiling point and a non-condensable gas, said liquid and said gas being charged in a vessel, said vessel being separated into a heating section and a cooling section by means of an adiabatic member to cause said liquid to boil at temperatures above a desired temperature.In the heat transfer device, a great amount of heat is transferred at temperatures above a desired temperature by causing vapor bubbles to transfer from said heating section to said cooling section, said bubbles resulting from boiling of said liquid, while no heat transfer is effected between the aforesaid two sections at temperatures below the desired temperatures.The heat transfer device is suited for use in such apparatuses or machines which require a thermal valving function, especially for use in a refrigerator.

Abstract: A heat transfer device comprises two kinds of liquid having different boiling points and specific gravities, said two kinds of liquid being not mutually dissolvable and charged in a vessel so as to form two layers therein in superimposed relation to each other. In the heat transfer device, a large amount of heat is transferred at temperatures above a certain temperature but unidirectionally, while no heat transfer is effected at temperatures below the aforesaid certain temperature. The heat transfer device is suited for use in such apparatus or machines which require a thermally valving function, especially for use in a refrigerator.