Engineering, 28.05.2021 20:30, naynay4evr

A well-insulated 1 m × 1 m × 0.5 m icebox initially at 20°C is to be cooled by a placing a cooling 200 L refrigerant cylinder. The Refrigerant used is R-134a at 160
kPa such that half of the cylinder is filled by liquid R-134a while the other half
contains R-134a in vapor phase. A 260 W DC fan is used to distribute the air inside
the box. As a result of heat transfer from the box to the cooling cylinder, the pressure
of the refrigerant reaches 500 kPa after 45 min. Assume constant specific heats for
the air at the box and the air pressure remains constant at 100 kPa; Determine
1- The mass of the refrigerant inside the cylinder.
2- The rate of heat transfer from the room to the refrigerant.
3- The mass of air in the box.
4- The final temperature of the box.

Answers: 1

Show answers

Other questions on the subject: Engineering

Engineering, 04.07.2019 18:10, DestyHilBan1183

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Answers: 3

continue

Engineering, 04.07.2019 18:10, samanthabutryn

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan

Answers: 3

continue

Engineering, 04.07.2019 18:10, oliviasoreo92

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa

Answers: 1

continue

Engineering, 04.07.2019 18:20, safiyabrowne7594

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?

Answers: 3

continue

Do you know the correct answer?

A well-insulated 1 m × 1 m × 0.5 m icebox initially at 20°C is to be cooled by a placing a cooling...