Shinwa Controls Co., Ltd

Hirofumi Komori

Hideaki Furumoto

Hiroki Mori

Takuya Ishimatsu

Yosuke Ikeda

Tomoaki Ito

Go Shiotsuki

Daisuke Aikawa

Kazunari Higashida

Kouji Suzuki

Yoshiyuki Okamoto

Leakage of a heating medium from a condenser or an evaporator can be quickly detected by a simple structure. A refrigeration apparatusaccording to the present invention is formed by connecting a compressor, a condenser, an expansion valveand an evaporatorby a pipesuch that a heating medium circulates therethrough in this order. The refrigeration apparatusfurther includes a pressure detection unitthat detects a pressure of the heating medium flowing through the pipe, and a control unitthat determines that leakage of the heating medium from the condenseror the evaporatorhas occurred, when a pressure detected by the pressure detection unitbecomes not more than a predetermined value.

Refrigeration apparatus

An air conditioner includes: a cooling unit having a compressor operated at a variable operating frequency to adjust a revolving speed thereof, a condenser, an expansion valve and a cooling coil; and a heating unit for causing the heating medium flowing from the compressor toward the condenser to diverge, and to return to flow into the condenser, through a heating coil and a thermal dose adjusting valve disposed on the downstream side thereof; so as to control a temperature of air by the cooling and heating coils. When an opening manipulated variable of the thermal dose adjusting valve exceeds a first threshold value over a period of time, an operating frequency of the compressor is decreased, and when the opening manipulated variable of the thermal dose adjusting valve falls below a smaller, second threshold value, over the said period of time, the operating frequency of the compressor is increased.

Air conditioner and its operating method

A temperature control system includes first and second temperature control devices. In the first temperature control device, a refrigeration circuit of a refrigeration device, which is positioned downstream of an expansion valve and upstream of an evaporator, and a brine circulation path of a brine circulation device, which is positioned on a heating unit, constitutes a refrigeration capacity adjustment mechanism, and cooling is performed by the evaporator of the refrigeration circuit. In the second temperature control device, a refrigeration device includes an injection circuit that bypasses a condensed refrigerant upstream of a compressor, and a hot gas circuit that bypasses a compressed high-temperature refrigerant upstream of a compressor. A part of the brine circulation path of the brine circulation device and an evaporator of the refrigeration device constitute a heating capacity adjustment heat exchanger, and heating or cooling is performed by a load unit of the brine circulation path.

Temperature control system, temperature control device and refrigeration device

Growing community of inventors

Kawasaki, Japan

Hirofumi Komori