A completely closed room with dimensions A m in the figure is heated by a hot water radiator. The heat emitted by the radiator is B kJ / h and the heating is by natural convection. Heat loss from the room was determined as C kJ / h. The temperature of the room is from D oC to E oC a) Calculate the time it will take [seconds]. b) If the temperature of the water entering the heating system is F oC return G oC, the flow rate of the hot water circulating in the system is [kg / h]. Note: Air is the Perfect gas. Room pressure (100 kPa) does not change

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Chemical and Phase Equilibrium

Phase diagrams or equilibrium phase diagrams are the graphical representations that show the phase transformations of the constituting elements with respect to the pressure, temperature, and compositions. The diagrams show the conditions that limit the different phases, namely solid, liquid, and gas. The diagram can also be utilized to verify the relations between the state variables. Most of the phase diagrams are temperature-pressure phase diagrams, with the variable parameter as the composition. Usually other variables such as solubility and pressure parameters are not indicated in the phase diagram. For a one-component system (unary phase diagram), the phase diagram is generally a function of temperature and pressure as the state variables, or temperature and volume. However, for a binary system (two-phase) having two components, the phase diagram is a function of temperature and composition as the state variables only. Coexisting of the different phases of the constituting elements is indicated in the phase diagram. A ternary phase diagram can be characterized by consisting of three phases in equilibrium.