Using the sound intensity method the noise radiated by a 3-door domestic frost free refrigerator was measured. The overall sound intensity contours of the five surfaces of the refrigerator in the frequency band from 20 Hz to 2000 Hz are shown in Fig. 6.22. This method helps to rank the noise source of the refrigerator. It is seen that the compressor located at the rear bottom of the refrigerator is the most noise pro­ducing part followed by the evaporator fan in the freezer compartment. A detailed measurement is done to determine the air-borne and structure borne noise path in the refregirator63. The radiated noise spectrum is rich in the harmonics of 50 Hz of the compressor operating speed, and the harmonics of the vane pass frequency of the evaporator fan. In order to reduce the noise radiated from the compressor apart from applying dampening materials on to the compressor shell, the sheet metal of the refrigerator body around the compressor are lined ure6.23 shows a view of the compressor compartment with the jute lining. Usually the compressor generates heat which is to be radiated while in operation, thus to ensure that the heat trans­fer from the compressor is not significantly affected, a temperature measurement on the compressor was done by monitoring round the clock using thermocouples. The temperature rise of the compressor with the jute treatment was 4°C with the maximum temperature reaching to 74°C. Further the jute-based temperature can withstand such increase in temperature with no adverse effects on the performance of the refrigerator.