Hitachi, Ltd.

Nec Corporation

Hitachi Appliances, Inc

Hiroshi Kogure

Satoshi Yamaguchi

Masaaki Itoh

Masahiko Gommori

Tetsunobu Okamura

Takeo Ozawa

Kenichi Saitoh

Haruko Ashida

Masakatsu Hayashi

Hiroaki Matsushima

Kazutaka Suefuji

Kensaku Oguni

Toshihiko Fukushima

Hidehiko Norimatsu

Takao Senshu

Tetsuya Arata

Izumi Ochiai

Hiromu Yasuda

Hirokiyo Terada

Kento Mochizuki

Mari Uchida

Mitsutaka Shizuya

Kyuhei Ishibane

Masahiro Miyagi

Akira Atsumi

Shigeaki Kuroda

Chie Kobayashi

Yukio Kitayama

Taichi Tanaami

Mituo Kudoh

Syoji Takaku

Kenji Iino

Kazufumi Muraoka

A hot-water supply system heats water through heat exchange between high-temperature refrigerant of a heat pump circuit and water of a water circulating circuit. The system is an instantaneous water heater unit for instantaneously heating, at a water heat exchanger, water supplied through a water supply pipe and supplying hot water to a using end unit. Therefore, a large-capacity hot-water storage tank is not needed. Sufficient heat of condensation to heat water can not be produced, because pressure conditions of the heat pump circuit is not stabilized just after the start of operation. Therefore, during a short period of rising time, hot water stored in a hot-water supply tank and water from the water heat exchanger are mixed and the mixture is supplied to keep the hot water at a preset temperature. Therefore, it is possible to use a smaller hot-water supply tank.

Heat pump hot-water supply system

The object of the present invention is to provide a compact lightweight heat pump hot-water supply system. The hot-water supply system heats water through heat exchange between high-temperature refrigerant of a heat pump circuit and water of a water circulating circuit. The system is an instantaneous water heater unit for instantaneously heating, at a water heat exchanger, water supplied through a water supply pipe and supplying hot water to a using end unit. In this system, therefore, large-capacity hot-water storage tank in conventional systems is no longer needed. Sufficient heat of condensation to heat water can not be produced, because pressure conditions of the heat pump circuit is not stabilized just after the start of operation. Therefore, during a short period of rising time, hot water stored in a hot-water supply tank and water from the water heat exchanger are mixed and the mixture is supplied to keep the hot water at a preset temperature. It is, therefore, possible to downsize the hot-water supply tank.

An air-conditioner of a heat pump type includes a refrigeration cycle including an interior heat exchanger, an exterior heat exchanger, a compressor, a four-way valve, and an expansion mechanism, and a non-azeotrope refrigerant composed of not less than two kinds of refrigerants is used as a working medium. A refrigerant path in each of the interior and exterior heat exchangers is divided into a group of first refrigerant passages located at a region where a proportion of the liquid-phase refrigerant is large and a group of second refrigerant passages located at a region where a proportion of the liquid-phase refrigerant is small. At least part of the group of first refrigerant passages of each of the interior and exterior heat exchangers is located at the windward side. Heat transfer tubes of the group of first refrigerant passages of each of the interior and exterior heat exchangers are smaller in flow-passage cross-sectional area than those of the corresponding group of second refrigerant passages.

Air-conditioner employing non-azeotrope refrigerant

Disclosed is an air conditioner and, in particular, an air conditioner which is capable of blowing out warm air in heating mode. In the air conditioner of this invention, the condenser is thermally separated into an air-upstream-side and an air-downstream-side heat exchanger, and the heat exchange capacity of the air-downstream-side heat exchanger is adjusted, so that, under preset operating conditions, the entire refrigerant in the air-downstream-side heat exchanger can be kept in the superheated-gas phase, thus making it possible to blow out warm air having a temperature higher than the condensation temperature. Further, the refrigerant temperature at the outlet of the air-downstream-side heat exchanger is measured by a temperature sensor, and the revolving speed of the compressor, the revolving speed of the fan, etc., is so controlled that the temperature measured is kept at a level higher than the condensation temperature. Thus, under all operating conditions, the entire refrigerant in the air-downstream-side heat exchanger can be kept in the superheated gas phase, thereby making it possible to blow out warm air having a temperature higher than the condensation temperature.

Air conditioner and heat exchanger used therein

A structure of an electronic part which may be mounted on and soldered to the surface of a printed circuit board, and a method of mounting such an electronic part. While the electronic part mounted on the circuit board is operation, heat generated by the part is efficiently radiated to the ambience. Connecting terminals extending out from the electronic part are firmly soldered to the circuit board by a minimum of heat, whereby the bonding strength and the strength against shocks are enhanced. The electronic part of interest and other electronic parts neighboring it are free from damage ascriable to heat when the former has connecting terminals thereof soldered to the circuit board. When the connecting terminals of the electronic part are soldered to the circuit board by a laser beam. Other electronic parts mounted on the circuit board are prevented from being damaged by the laser beam.

Electronic part mountable on the surface of a printed circuit board and

An air conditioner comprising temperature detectors for respectively detecting air temperatures at suction and discharge sides, a fan motor whose rotational speed is controllable, a motor driven wind directing plate, and a control section for controlling the discharge angle by the wind directing plate and for controlling the air flow amount by the fan motor. Thus, the air flow amount and the discharge angle are controlled by the control section to heat a room such that the heating operation is effected with a small amount of warmed air of a high temperature immediately after the start of operation, and the amount of warmed air is gradually increased and the discharge angle is also gradually changed as the room temperature rises.

Air conditioner

The present invention is characterized by selecting, during heating, the hot air blowing mode in which a compressor and a blower for an indoor heat exchanger are each controlled as to r.p.m. to control the temperature of outlet air blown from an air conditioner at a higher temperature, and the normal mode in which the room temperature is controlled. Also, as required, an air passage of the outlet is set to be narrow to blow hot air in a confined space, or the air passage of the outlet is set wide to disperse warm air during normal operation.

Control method and apparatus for an air conditioner using a heat pump

A fin-and-tube type heat exchanger is disclosed in which the height of each raised, slotted louver from a fin base portion continuously changes in a direction crossing at right angles both the direction of the air flow and the direction of lamination of fins, and two or three kinds of such louver pairs, each consisting of louvers symmetric with each other with respect to the fin base portion, are arranged regularly.

Fin-and-tube type heat exchanger

Growing community of inventors

Sano, Japan

Hiroshi Kogure