निम्नलिखित में से किस स्नेहक (Lubricant) का उपयोग प्रशीतन (Refrigeration) प्रणालियों में नहीं किया जाता है?

In a vapor absorption refrigeration system, the primary function of the absorber is to:

In a simple vapour compression refrigeration cycle, the throttling process is assumed to be:

Which of the following is NOT a synthetic chemical refrigerant used in vapor compression refrigeration systems?