by Maryam Hussain How the working of a theoretical engine was proposed? The theoretical heat engine was proposed by Sadi Carnot in 1824 . Heat engines are devices that can convert heat into mechanical energy. Like a Steam engine or Motor vehicle, the working principle of all heat engines is the same in which any working substance gas or vapor is brought back to the initial stage by going through different thermodynamic stages of a cyclic process . Carnot suggested that, if a heat engine goes through fixed thermodynamic stages of a specified process, then the efficiency of the heat engine may be 100% possible. Ideally, this engine gives maximum efficiency. No other engine can be more efficient than this. The specified cyclic process suggested by Carnot is called the Carnot cycle. The Carnot engine has four main parts: 1). First, an insulated, non-conducting stand , so that the transfer of energy is not possible . 2). Second, a hot reservoir with infi...
by Maryam Hussain Why do refrigerators’ compressor runs for longer durations & waste electrical energy? Required compartment temperatures: The ideal temperature inside (the lower section of) a refrigerator is between 36˚ and 38˚ F. For a freezer, the temperature should range between –5˚ and 5˚ F. If you think that your refrigerator and freezer are too warm or too cold, test them by putting a thermometer in the refrigerator and freezer cabinets for a couple of hours each, and check the readings. If they’re high or low w.r.t above mentioned ranges, adjust the temperature controls up or down to reach the correct temperature. If the temperature controls don’t fix the problem, further troubleshooting is required. Leaky gaskets of a refrigerator door: The doors of the refrigerator and freezer of your unit are fitted with rubber gaskets to seal the cold air inside. If the gasket is worn out, the compressor has to work with overtime to keep up, which increases...