Acoal fired boiler plant consumes 400kg of coal per hour. the boiler evaporates 3200 kg of water at 44°c into superheated steam at a pressure of 10 bar and 220°c. if the calorific value of coal is 32760 kj/kg, determine: i)-equivalent evaporation from an at 100°c ii)-thermal efficiency of the boiler.

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?