3) If the measurement parameters of a refrigeration machine are known, the amount of heat for liquid refrigerant (mix) when it enters the evaporator is 650 Btu/lb, the amount of heat for vapor refrigerant after it comes from the evaporator is 950 Btu/lb, and the amount of heat for superheat refrigerant after being compressed is 1280 Btu/lb. lb. Calculate the efficiency of the refrigeration machine?

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A:

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Q: A canot engine receives 130 Btu of heat from a hot reservoir at 700 °F and rejects 49 Btu of heat.…

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Q: Steam enters a turbine with an enthalpy of 1292 BTU/lb and leaves with an enthalpy 1098 BTU/lb. The…

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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.