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Exercises Chap 1&2

The document contains a series of exercises focused on conversions between different units of measurement, calculations related to heat loss, pressure changes, and specific heat capacities. It includes questions on thermodynamic properties of water and the behavior of substances under varying conditions. Additionally, it provides tables for water's properties at different pressures and temperatures, and requires calculations for specific scenarios involving heat and pressure.

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10 views2 pages

Exercises Chap 1&2

The document contains a series of exercises focused on conversions between different units of measurement, calculations related to heat loss, pressure changes, and specific heat capacities. It includes questions on thermodynamic properties of water and the behavior of substances under varying conditions. Additionally, it provides tables for water's properties at different pressures and temperatures, and requires calculations for specific scenarios involving heat and pressure.

Uploaded by

Thủy Tiên
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Exercise of chapters 1 and 2

Make the following conversions:


1) 10 ft lbf/lbm to J/kg
2) 0.5 Btu/lbmoF to J/kg.oC
3) 32.174 lbmft/lbfs2 to kg.m/N.s2
4) 1,000 lbmft/s2 to N
5) 10 kcal/min.ft.oF to W/m.K
6) 30 psia to atm
7) 0.002 kg/m.s to lbm/ft.s
8) 1.987 Btu/lbmol.R to cal/gmol.K,
9) 10.731 ft3lbf/in2.lbmol.R to J/kgmol.K
10) The specific heat capacity of sulfuric acid is given by the equation:
Cp = 13911 + 0.156T (C) (J/kg.C), T in C
How will the equation for specific heat change if CP is expressed in Btu/lb.R.
1. An apple loses 4.5 kJ of heat as it cools per °C drop in its temperature. How much is
the amount of heat loss from the apple per °F drop in its temperature?
2. During a heating process, the temperature of an object rises by 10°C. This
temperature rise is equivalent to a temperature rise of how many R-degrees?
3. Consider a fish swimming 5 m below the free surface of water. What is the increase
in the pressure (Pa) exerted on the fish when it dives to a depth of 25 m below the free
surface?
4. The atmospheric pressures at the top and the bottom of a building are read by a
barometer to be 96.0 and 98.0 kPa. If the density of air is 1.0 kg/m3, what is the height
of the building ?
5. Consider a 2-m deep swimming pool. What is the pressure difference (kPa) between
the top and bottom of the pool?
6. At sea level, the weight of 1 kg mass in SI units is 9.81 N. What is the weight of 1
lbm mass in English units?
7. A 2-kW electric resistance heater in a room is turned on and kept on for 50 min.
How much is the amount of energy transferred to the room by the heater? (6,000 kJ)
8. Complete the following table for H2O:
P, kPa T, °C v, m3/ kg u, kJ/kg Phase description
200 30 0,001004 125,71 Compressed liquid
200 400 1.5493 2967,2 Superheated steam
300 133,52 0.500 2196,4 Saturated mixture=0,825
500 473,1 0,6858 3084 Superheated steam
9. Complete the following table for H2O:
P, kPa T, °C v, m3/ kg u, kJ/kg Phase description
12,35 50 4.16 981,6 Hỗn hợp lỏng hơi
200 120,2 0,886 2530 Saturated vapor
400 250 0,6351 2726,5 Hơi quá nhiệt
600 110 0,01052 461,1 Lỏng quá lạnh

10. Complete the following table for H2O:


P, kPa T, °C v, m3/ kg u, kJ/kg Phase description
0,03613 140 0.05 777,6 Hỗn hợp lỏng hơi, x = 9,63%
550 83,635 0,010315 350,15 Saturated liquid
167.7 125 0,0010645 524,75 Lỏng quá lạnh
143,3 110 0.14 697,5 Hỗn hợp lỏng hơi, x =

11. A 1-m3 rigid tank contains 10 kg of water (in any11,49%


phase or phases) at 160C.
Determine the pressure in the tank. (618 kPa)
12. A 3-m3 rigid vessel contains steam at 4 MPa and 500°C. Determine the mass of the
steam. (35 kg) (d) 91 kg

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