![]() ![]() ![]() ![]() Again process is reversibleĪt D the heat reservoir at temperature T h is brought into contact with the cylinder and as a result slow isothermal expansion occurs from state D to A, there by completing the cycle. Thus process B to C is also reversibleĪt C the heat reservoir at temperature T c is removed and the insulation put back. ![]() The gas is then compressed quasi statically from state B to C and at constant temperature with heat transfer from the gas to the reservoir through a negilible temperature difference. When the gas reaches temperatures T c the heat reservoir at temperature T c is brought into contact with the cylinder end. As the gas expands its U decreases (dU=Q-W) and its temperature drops until it reaches T c. The gas expands adiabatically and very slowly, i.e., quasi-statically (and therefore reversibly). In state A the gas is temperature Th and the cylinder is fully insulated The cycle on a p-v diagram is shown below: The system is a mass of gas behind a piston. The process take place between a heat source at temperature T h and a heat sink at temperature T c. It consisted of four processes, two isothermal and two adiabatic. In 1824 Carnot suggested a particular cycle of operation for a CHPP which avoided all irreversibilities. ![]()
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