Sulfur dioxide is emitted at a rate of 2 kg/s from the top of a chimney that is 120m high. The plume initially rises vertically a further 10m above the chimney exit, before being convected horizontally by a wind speed of 15m/s under conditions of neutral stability. The daytime isolation is moderate. Calculate

a) The concentration on the plume centre-line at a distance of 800m downwind of the chimney

b) The ground level concentration at a distance of 800m downwind of the chimney

c)The concentration at 1542m location

An adiabatic dehumidifier is used to extract excess moisture from the air inside your hostel room with dimension 8 x 6 x 3 m3 . The room was initially at a dry bulb temperature of 30 oC, 70 % relative humidity is to be humidified to 40 % relative humidity. a) Sketch the process in the phsychrometric chart provided b) Estimate the adiabatic saturation temperature of the entrance air and the final temperature (dry bulb) of the air. c) Calculate the amount moisture removed by the humidifier (in kg) d) Briefly explain how could you reduce the humidity further using the humidifier

a. Why does water become less dense as it freezes?
b. Why the ΔG mix , for nonideal solution is not always negative
c. To the thermodynamics of mixing of 2 components, find the mol fraction that has
the largest impact on the thermodynamic quantities of the final solution.
d. Calculate the effect that mixing 2 moles of nitrogen and 3 moles of oxygen has on the
entropy of the final solution at 27 o C.

A system undergoes a change in volume from 100 cm3 /mol to 225 cm3 /mol. The pressure of the model is predicted by, P = aT + B/T^3,

where a = 2.13x10-3 bar/K and

ß = 2.6x10-5 bar^3K^3.

Calculate AS at 350 K (in J/mol-K) b. What is the heat required at 350 K (in J/mol)? c.

Calculate AU for the system described (in J/mol-K)

SHOW ALL WORK.THANKS

An ideal vapor compression refrigeration cycle with R134a as the working fluid operates between the pressure limits of 200 kPa and 1200 kPa. Determine

a) the mass fraction of the refrigerant that is in the liquid phase at the inlet of the evaporator, and

b) the amount of heat transfer (in kJ/kg) to the refrigerant in the evaporator (??).

15 m3 /min of air at 104o F and 60% relative humidity is cooled to 59o F and 100% relative humidity, and then reheated to 68o F. Find the following:

a. The flow rate of dry air (BDA) in kg /min.

b. The amount of water condensed during cooling stage.

c. kW of power needed for cooling the air in the cooling stage.

d. kW of power needed for the heating step.

Calculate the fugacity of liquid water in a binary liquid mixture with 40 mole % water and 60 mole % ethanol at 70°C. The following activity coefficient data, at infinite dilution, are available: yinfinite H2O. = 2.62 and yinfinite ethanol = 7.24

what features would you expect to find at a convergent plate boundary? Be specific and discuss earthquakes, the age of the ocean floor, volcanoes, and topographic features. describe any convergent boundaries present on the west coast of north america.

Please write a full page describing this

If it is a hot day and the swamp cooler isn't working, if one were to open their refrigerator door to cool the house down, would it work? Please give an explanation that pertains to thermodynamics.

In hot and humid areas, swamp coolers don’t work. Those places use heat pumps and dump the heat into pipes that are buried in the ground. Underground, the temperature is considered constant all year, assume 55 °F. What will be the improvement in terms of energy efficiency with this arrangement, as opposed to using a conventional air conditioner? Assume the house is to be maintained at 70 °F and the outside temperature is 95 °F. Calculate the energy required per BTU of heat removed from the house, for these two arrangements, heat pump versus air conditioner.

Please show your work. Thank you so much !

Bismuth and cadmium form a simple eutectic mixture that behaves like that in model 3. Bismuth melts at 271°C and 1 bar, whereas cadmium melts at 321°C and 1 bar. The enthalpy of fusion of bismuth is 11.30 kJ/mol, and that of cadmium is 6.19 kJ/mol. A eutectic point is observed at 55.5 mol% cadmium.

1. Calculate the melting temperature of the eutectic mixture. Assume ideal behavior. 

2. Roughly sketch the phase diagram at 1 bar, labeling the points described above for reference. 

3. Sketch a cooling curve that passes through the eutectic point. 


Water flowing at a rate of 0.03 kg/s is heated from 20 to 40°C in a horizontal pipe (inside diameter = 3 cm). The inside pipe surface temperature is 70°C. Estimate the convective heat transfer coefficient if the pipe is 1 m long. Assume forced convection conditions.  Ts is not held constant!

Properties of Water

An outside-air sample is taken on a day when the temperature is 78 F and the relative humidity is 40%.

(a) Use the psychrometric chart to state as many physical properties of the air as you can without doing any calculations. For each one, provide a brief description of the property listed.

(b) A thermometer is mounted on the back porch of your house. What temperature would it read for the air described in this problem?

(c) A sample of outside air is cooled at constant pressure. At what temperature would condensation begin?

(d) You step out of your neighborhood pool and feel quite cold until you dry off. Explain why. Estimate your skin temperature while you were still wet. Explain your answer. What would be different if the relative humidity were 98%?