HW_9_Solution0

HW_9_Solution0 - Solution Homework 9 1. A cylinder is...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Solution Homework 9 1. A cylinder is initially filled with R-134a at a specified state. The refrigerant is cooled at constant pressure. The amount of heat loss is to be determined, and the process is to be shown on a T-v diagram. Assumptions 1 The cylinder is stationary and thus the kinetic and potential energy changes are zero. 2 There are no work interactions involved other than the boundary work. 3 The thermal energy stored in the cylinder itself is negligible. 4 The compression or expansion process is quasi-equilibrium. Analysis We take the contents of the cylinder as the system. This is a closed system since no mass enters or leaves. The energy balance for this stationary closed system can be expressed as ) ( 0) = PE = KE (since ) ( 1 2 out 1 2 ou , energies etc. potential, kinetic, internal, in Change system mass and work, heat, by nsfer energy tra Net in h h m Q u u m U W Q E E E t b   since U + W b = H during a constant pressure quasi-equilibrium process. The properties of R-134a are (Tables A-11 through A-13) kJ/kg 72.34 C 15 kPa 900 kJ/kg .63 315 C 0
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/05/2010 for the course MEEN 315 taught by Professor Ramussen during the Summer '07 term at Texas A&M.

Page1 / 3

HW_9_Solution0 - Solution Homework 9 1. A cylinder is...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online