Reference no: EM131307508
Please reference any source of outside information as needed to answer these questions.
1. In a frozen food plant, atmospheric air is to go through a pre-cooler to be partially dehydrated so that during its passage through a large cold room used for food storage excess ice formation can be avoided on the chilling coils in the room.
We have an intake atmospheric air at 26.8 °C and 102 kPa, with a relative humidity of 43.2 %, and a flow rate of 2150 m3/h. It is firstly cooled in the pre-cooler to 4.5 °C and 102 kPa to partially condense the water from the intake air prior to it entering the cold room. Answer the following and make sure you state clearly any assumptions you may have made.
(a) What is the molar flow rate of dry air and water vapour in the feed air?
(b) What is the molar humidity and absolute humidity of the feed air?
(c) What is the mole fraction of water in the air stream out of the pre-cooler?
(d) What is the rate of water removal in the pre-cooler?
(e) After 30 days of operation the cold room is defrosted. Given that the vapour pressure of ice (i.e. the sublimation pressure) at -18.0 °C is 125 Pa, calculate the mass of liquid water that will defrost.
The normal boiling point of propane is - 42.1oC and the normal boiling point of n- butane is - 0.5 °C.
(a) Calculate the mole fraction of the propane in a liquid mixture that boils at -31.2oC and 1 atm.
(b) Calculate the corresponding mole fraction of the propane in the vapour phase at - 31.2 °C and 1 atm.
(c) Plot the temperature vs. propane mole fraction phase diagram for this binary system as accurately as you can. Label the diagram properly and clearly including the T - x curve, T - y curve and all phase domains. Mark in the diagram the normal boiling points for both pure species, and the calculated molar fractions in parts (a) and (b). Provide the spreadsheet you used to generate the phase diagram.
|
Would your portfolio be riskless
: Suppose you owned a portfolio consisting of $250,000 of U.S. government bonds with a maturity date of 30 years. Would your portfolio be riskless?
|
|
Define the sequence number of a segment
: In TCP, how do we define the sequence number of a segment (in each direction)? Consider two cases: the first segment and other segments.
|
|
Would the risk premium on a high-beta stock increase
: If investors'aversion to risk increased, would the risk premium on a high-beta stock increase by more or less than that on a low-beta stock? Explain.
|
|
What is the maximum size of the tcp header
: The maximum window size of the TCP was originally designed to be 64 KB (which means 64 × 1024 = 65,536 or actually 65,535). Can you think of a reason for this?
|
|
Calculate the mole fraction of the propane
: ENSC 3005 - Mass and Energy Balances What is the molar flow rate of dry air and water vapour in the feed air - What is the molar humidity and absolute humidity of the feed air?
|
|
Examines the relationship between the quality of breakfast
: Each of the following studies examines the relationship between the quality of breakfast and academic performance for third-grade children.
|
|
What is the server supposed to do in this case
: Assume a client sends a SYN segment to a server. When the server checks the well-known port number, it finds that no process defined by the port number is running. What is the server supposed to do in this case?
|
|
How mcdonalds should handle information regular food items
: Describe differences in how McDonald's should handle information and planning for (1) regular food items, (2) nonfood items like wrappers or napkins, and promotional or one-time items like Happy Meal toys.
|
|
Academic performance and breakfast quality
: Describe how a third variable, such as family income or parents' educational level, might explain the relationship between academic performance and breakfast quality.
|