Diagnosis and forecast of refrigerant leakage in the refrigeration system;

Analyses the operating conditions of a unitary air conditioner in different refrigerant charges and proves that refrigerant leakage is dangerous to operation of the unit and air conditioning systems shall be equipped with low pressure protectors.

Aiming at the noise interference problems occurred in acoustic emission pipeline leakage detection,signal analysis method based on wavelet package and empirical mode decomposition(EMD) were researched,respectively.

To solve the problem of pipeline leak detection and meet the demand of student\'s learning,an experimental system of pipeline leak detection based on negative pressure wave and flow is established in the laboratory.