A vertical cylinder 76.2mm in diameter and 121.9mm high is maintained at 397.1K at its surface. It loses heat by natural convection to air at 294.3K. Heat is lost from the cylindrical side and the flat circular end at the top. Calculate the heat loss, neglecting radiation losses. Use the simplified equations of Table 1.5-2 and those equations for the lowest range of GrPr. The equivalent L use the top flat surface is 0.9 times the diameter

In textbook Engineering and Chemical Thermodynamics (2nd Edition), chapter 7 problem 33

7.33 A mixture of 2 moles propane (1), 3 moles butane (2), and 5 moles pentane (3) is contained at 30 bar and 200°C. The van der Waals constants for these species are: Species a3Jm3mol22 4 b3m3/mol4 Propane 0.94 9.06 3 1025 Butane 1.45 1.22 3 1024 Pentane 1.91 1.45 3 1024 Determine the fugacity and fugacity coeffi cient of propane using the following approximations: (a) the Lewis fugacity rule (b) the virial form of the van der Waals equation truncated to the second term.

Im unsure how to find partial molar volume here.

A benzene/toluene liquid mixture consisting of 31 mole% benzene is fed to a reboiler, where 1250 KW of heat is provided causing the mixture to partially vaporize. The vapor output has a flowrate of 80 kmol/hr and consists of 40 mole% benzene. The liquid output has a flowrate of 100 kmol/hr. The two output streams are in equilibrium and exit the reboiler at 130 oC. Determine the temperature of the feed stream. Neglect the effect of pressure and consider the following additional data:

SELECT ALL THAT OCCURS WHEN THE REBOIL RATE IS INCREASED.

A) THE BOTTOMS FLOW RATE IS INCREASED;

B) THE DISTILLATE CONCENTRATION IN THE BOTTOMS DISCHARGE IS INCREASED;

C) THE COLUMN TEMPERATURE IS INCREASED;

D) THE NUMBER OF THEORETICAL PLATES INCREASES IN A PACKED COLUMN;

SELECT ALL THAT OCCURS WHEN THE REFLUX RATE IS INCREASED.

A) THE OVERHEADS DISTILLATE RATE IS INCREASED;

B) THE OVERHEADS DISTILLATE PURITY IS INCREASED;

C) THE COLUMN TEMPERATURE IS INCREASED;

D) THE NUMBER OF THEORETICAL PLATES INCREASES IN A PACKED COLUMN;

Repeat the procedure from Part C for the other three oxides,

then rank all four oxides according to their enthalpy of reduction.

Rank from greatest (most positive) to least enthalpy of reduction. To rank items as equivalent, overlap them.

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during a steady flow process a mixture of 8 kmol of N2 and 2 kmol of O2 is heated from 200 K to 250 K at a constant pressure of 12 MPa. determine the heat transfer during this process using 1- the ideal gas approximation 2- kay's rule

300% excess air having a dry bulb temperature of 25 degree celsius and relative humidity of 60% is used to fully combust 1 kg/hr of methane in a boiler and the heat of reaction is used to generate steam. Hot water enters the boiler as a saturated liquid at 102 degree celsius and leaves as superheated at 40 bar and 400 degree celsius.

The combusted gases leave the boiler at 450 degree celsius and are then cooled to 25 degree celsius causing some of the water in the gas to condense.

Assuptions:

The combustion reaction takes place at 450 degree celsius.

The combusted gases can be assumed to have the properties of air.

The heat capacity of air can be assumed constant at an average temperature of 225 degree celsius.

so, what is the moisture content of the incoming air on a dry basis? and how much energy is transferred during the cooling of the combusted gases?

At the beginning of the compression process of an air standard Otto cycle, p₁ = 1 bar, T₁ = 300 K. The maximum temperature in the cycle is 2250 K and the compression ratio is 9.8. The engine has 4 cylinders and an engine displacement of V_d = 2.7 L. Determine per cylinder:

c)    the heat addition per cycle, in kJ.
d)    the heat rejection per cycle, in kJ.
e)    the net work per cycle, in kJ.
f)     the thermal efficiency.
g)    the mean effective pressure, in bar.

In what ways could the U.S. government encourage the use of more environmentally-friendly fuels?

Saturated propane vapor at 200 psia is fed to a well-insulated heat exchanger at a rate of 2600 standard cubic feet per hour. The propane leaves the exchanger as a saturated liquid (a liquid at its boiling point) at the same pressure. Cooling water enters the exchanger at 70 oF. Flowing concurrently (in the same direction) with the propane. The temperature difference between the outlet streams (liquid propane and water) is 15 oF.

Estimate the required flow rate (lbm/h) of the water to take away the heat from exchanger. (you will need to write two separate energy balances.) Assume the heat capacity of liquid water is constant at 1.0 Btu/(lbm.oF) and neglect heat losses to the outside and the effects of pressure on the heat of evaporation of propane.

3. An insulated container contains 2.7 kg of steam at 1.4 bar and 120°C. The top is opened and a 1.8 kg block of ice at 0°C and 4.5 kg of liquid water at 1.6°C are dumped into the container. What is the final temperature of the resulting vapor-liquid mixture in the container? Note: It takes 6.0095 KJ/mol to melt ice.

During a reversible non-flow process, a cylinder containing 0.075 kg of fluid having pressure of 1.2 bar, a volume of 0.07 m³ and specific internal energy of 180 kJ/kg undergoes a steady polytropic compression process. The steady final pressure , volume and specific internal energy are 9.5 bar, 0.0125 m³ and 350 kJ/kg respectively.

Calculate

1. The compression index n
2. The work required for the compression
3. The quantity and direction of heat energy                              

Assume it was a steady isothermal (hyperbolic) compression process with final volume 0.0125 m³. Calculate

4. Pressure at the final state
5. The work required for the compression
6. The quantity and direction of heat energy