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

Another question on Engineering

Engineering, 04.07.2019 18:10

The flow rate of air through a through a pipe is 0.02 m5/s. a pitot static tube is placed in the flow. the radius of the pitot static tube is 1 mm. assuming the flow to be steady and the air to be at 300k, calculate the difference in total and static pressure if the diameter of the pipe is: (a) d 0.1 m d 0.05 m (c) d 0.01 m

Answers: 2

Answer

Engineering, 04.07.2019 18:20

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives

Answers: 2

Answer

Engineering, 04.07.2019 18:20

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?

Answers: 2

Answer

Engineering, 04.07.2019 18:20

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.

Answers: 2

Answer

You know the right 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...

Questions