HW1-336 - ME 336 HW SET 1 C BORGNAKKE ME 2.e A car tire gauge indicates 195 kPa what is the air pressure inside The pressure you read on the gauge

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ME 336 HW SET 1 C. BORGNAKKE, ME 2.e A car tire gauge indicates 195 kPa; what is the air pressure inside? The pressure you read on the gauge is a gauge pressure, Δ P, so the absolute pressure is found as P = P o + Δ P = 101 + 195 = 296 kPa 3.10 Why are most of the compressed liquid or solid regions not included in the printed tables? For the compressed liquid and the solid phases the specific volume and thus density is nearly constant. These surfaces are very steep nearly constant v and there is then no reason to fill up a table with the same value of v for different P and T. 3.37 Determine the specific volume for R-410a at these states: a. –15 o C, 500 kPa b. 20 o C, 1000 kPa c. 20 o C, quality 25% a) Table B.4.1: P > P sat = 480.4 kPa, so compressed liquid. v v f = 0.000815 m 3 /kg b) Table B.4.1: P < P sat = 1444 kPa, so superheated vapor Table B.4.2: v = 0.02838 m 3 /kg c) Table B.4.1: v f = 0.000815 m 3 /kg, v fg = 0.01666 m 3 /kg so v = v f + x v fg = 0.000815 + 0.25 × 0.01666 = 0.00498 m
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This note was uploaded on 10/20/2009 for the course MECHENG MEecheng 3 taught by Professor Borgnakke during the Fall '09 term at University of Michigan.

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HW1-336 - ME 336 HW SET 1 C BORGNAKKE ME 2.e A car tire gauge indicates 195 kPa what is the air pressure inside The pressure you read on the gauge

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