Modern Engineering Thermodynamics 1st. Edition by Robert T. Balmer | 9780123749963 | 0123749964 | Holooly

Modern Engineering Thermodynamics

231 SOLVED PROBLEMS

Question: 8.2

The solar power plant shown in Figure 8.2 utilizes the thermal energy of the sun to drive a heat engine. Solar collectors with a constant surface temperature of 200.°F absorb 100. × 10³ Btu/h of solar energy and deliver it to the heat engine. The heat engine rejects heat to a condenser in a river ...

Verified Answer:

First, draw a sketch of the system. Here, the unkn...

Question: 18.3

Test assumption 7 at the beginning of this section by computing the fraction of neon molecules at 273 K whose velocities are faster than (a) Vmp, (b) Vavg, (c) Vrms, and (d) c (the speed of light). Use the molecular data for neon given in Example 18.2 ...

Verified Answer:

a. The fraction having velocities greater than [la...

Question: 17.10

The death rate constant for mice at 27.0°C is 0.0350 months^–1 . Determine the coefficient α in Eq. (17.33) for mice ...

Verified Answer:

At

T = 27.0°\text{C} = 300. \text{K}[/latex...

Question: 17.1

Using the concentration data provided in Table 17.2, determine the membrane potential in human cells of sodium, potassium, and chlorine ions at 37.0°C. ...

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Table 17.2 gives the concentration of sodium ions ...

Question: 11.4

Suppose we make a series of measurements in the laboratory and think we discovered a new thermodynamic property, call it z. Our experimental data provide an empirical equation of the form: dz = p dv + v² dp. Is z a new property? ...

Verified Answer:

The unknown is whether or not

z

is ...

Question: 19.6

If the vessels in Example 19.5 were maintained isobaric at a mean temperature of 30.0°C and the measured thermomechanical heat transfer rate was 8.70 J/s, then find the induced isobaric mass flow rate and the resulting temperature difference between the vessels. ...

Verified Answer:

From Eq. (19.59), we have

\dot{m}_i = \frac...

Question: 19.5

Both of the large vessels shown in Figure 19.10 are filled with saturated liquid water at 30.0°C. They are maintained isothermal but have a pressure difference of 10.0 kPa. The interconnecting tube has an inside diameter of 0.0100 m and is 0.100 m in length. It is filled with a porous material ...

Verified Answer:

a. For an isothermal system,

dT = 0

...

Question: 19.4

A membrane with a permeability of 1.00 × 10^−6 m^2 separates two chambers filled with carbon dioxide gas. The gas has a temperature of 300. K on one side of the membrane and 305 K on the other side. The osmotic heat conductivity (ko) of the membrane with CO2 is 2.00 × 10^4 m^2 /s and the viscosity ...

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Since this is a steady state problem, we can use t...

Question: 19.3

The chromel-alumel thermocouple circuit shown below has its cold junction at 0°C and its hot junction at 100.°C. Assuming that the absolute Seebeck coefficients αch = 23.0 × 10^−6 V/K and αal = −18.0 × 10^−6 V/K are constant over this temperature range, determine a. The open circuit thermoelectric ...

Verified Answer:

a. The relative Seebeck coefficient for the chrome...

Question: 19.2

The open circuit voltage of an iron-copper thermocouple is approximately given by ϕfe-cu = (−13.4 T + 0.014 T^2 + 0.00013 T^3) × 10^−6 V where T is in °C, not K. At 100.°C, determine a. The relative Seebeck coefficient αfe-cu. b. The relative Peltier coefficient πfe-cu. ...

Verified Answer:

a. From Eq. (19.15), we have that

σ_\text{A...

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