Explanation Consider the refrigerant flows at steady state through one inlet and one exit system (throttle valve). Hence, the inlet and exit mass flow rates are equal. m ˙ 1 = m ˙ 2 = m ˙ Write the energy rate balance equation for one inlet and one outlet system. [ Q ˙ 1 + W ˙ 1 + m ˙ ( h 1 + V 1 2 2 + g z 1 ) ] − [ Q ˙ 2 + W ˙ 2 + m ˙ ( h 2 + V 2 2 2 + g z 2 ) ] = Δ E ˙ system (I) Here, the rate of heat transfer is Q ˙ , the rate of work transfer is W ˙ , the enthalpy is h and the velocity is V , the gravitational acceleration is g , the elevation from the datum is z and the rate of change in net energy of the system is Δ E ˙ system ; the suffixes 1 and 2 indicates the inlet and outlet of the system. The refrigerant flows at steady state through the throttle valve. Hence, the rate of change in net energy of the system becomes zero. Δ E ˙ system = 0 Since, it is a throttling process. In this process the enthalpy alone remains constant. Hence, neglect the heat transfer, work transfer, kinetic and potential energies. The Equations (I) reduced as follows. [ 0 + 0 + m ˙ ( h 1 + 0 + 0 ) ] − [ 0 + 0 + m ˙ ( h 2 + 0 + 0 ) ] = 0 m ˙ h 1 − m ˙ h 2 = 0 m ˙ h 1 = m ˙ h 2 h 1 = h 2 (II) At the inlet: The refrigerant is at the state of saturated liquid. Refer Table A-11, “Saturated refrigerant-134a-Temperature table”. Obtain the following properties corresponding to the temperature of 50 ° C - using interpolation method. Write the formula of interpolation method of two variables. y 2 = ( x 2 − x 1 ) ( y 3 − y 1 ) ( x 3 − x 1 ) + y 1 (III) Show the temperature and enthalpy values from the Table A-11 as in below table. S.No. x y Temperature ( T ) ,in °C Enthalpy ( h f ) , in kJ/kg ⋅ K 1 48 120

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ISBN: 8220106796979

Author: CENGEL

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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. T…

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Chapter 5.5, Problem 64P

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Chapter 5.5, Problem 63P

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The quality of the refrigerant.

Solution Summary: The author calculates the energy rate balance equation for one inlet and one outlet system.

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