Answers: 3
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 04.07.2019 18:10
Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.
Answers: 1
Engineering, 04.07.2019 18:10
Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?
Answers: 1
Engineering, 04.07.2019 18:10
Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?
Answers: 3
What is the purpose of an engineer?...
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
History, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Chemistry, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01
Mathematics, 10.09.2020 14:01