Environmental test apparatus with bypass flow path with flow rate control portion controlled according to temperature of compressor

An environmental test apparatus that can create a predetermined environment inside a test chamber, the environmental test apparatus comprising:

• the test chamber configured such that a test target object is placed inside the test chamber;
• a heating portion configured to heat an inside of the test chamber;
• and
• a cooling portion configured to cool the inside of the test chamber, wherein
• the cooling portion has a refrigeration circuit in which a phase-changing refrigerant is circulated, the refrigeration circuit having a compressor, a condenser configured to receive compressed refrigerant from the compressor, an expansion portion configured to receive condensed refrigerant from the condenser, and an evaporator configured to receive expanded refrigerant from the expansion portion and to return vaporized refrigerant to the compressor,
• the refrigeration circuit has a first bypass flow path connecting a discharge side of the condenser and a suction side of the compressor and the first bypass flow path is provided with a first flow rate control portion,
• a temperature measurement portion is configured to measure a temperature of the compressor, and
• a controller is configured to control the inside of the test chamber to the predetermined environment and to control a degree of opening of the first flow rate control portion according to a detection value of the temperature measurement portion.