| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a refrigeration unit comprising an electronic expansion valve and to reduce its manufacturing cost, by properly keeping a degree of overheat of a refrigerant sucked to a compressor by properly adjusting an opening of the electronic expansion valve. SOLUTION: A controller 80 of an air conditioner 10 is provided with an opening target setting part 84 and an opening control part 85. The opening target setting part 84 sets a control target value of the degree of suction overheat on the basis of a detection value of a degree of discharge overheat and a detection value of a degree of suction overheat. The opening control part 85 adjusts the opening of the electronic expansion valve 36 to make the detection value of the degree of suction overheat be agreed with the control target value set by the opening target setting part 84. By setting the control target value of the degree of suction overheat by the opening target setting part 84, the opening of the electronic expansion value 36 can be properly controlled to keep the degree of suction overheat to an optimum value, even when the detection value of the degree of suction overheat is shifted from the actual degree of suction overheat. |
