An empty greenhouse with a volume of 60m³ has cracks around doors and windows so that air can flow through and allowing the pressure inside to always remain equal to that of the surrounding environment. On a particular day when the atmospheric pressure is 100kPa, the air in the greenhouse changes temperature from 10℃ to 40℃ by means of radiative heating from the sun. Assume that the air can be modeled as an ideal gas with constant properties cᵥ=715.9J/kg*K and R?=286J/kg*K.  (1) What is the change in energy stored by the system?  (2) Treating the greenhouse as an open system, determine the heat transfer necessary to produce this temperature change.  (3) Is the process totally reversible? Justify your answer. If it is not totally reversible, identify the source(s) of irreversibility.

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.