Korea University
Department of Mechanical Engineering
2016 Numerical Analysis
Homework #2
Due date : April 13 (2016/04/13)
In class : Noon : 12 pm
1. (12 pts) (True/False), if false, please write a correct statement.
(a) The Bairstows method is effective

Refrigeration
HW #3
Due date: 10/18/2016
1. Catalog data for a cylinder refrigerant 22 compressor operating at 29 r/s (revolution per second)
indicate a power requirement of 5.2 kW at an evaporating temperature of 4 and condensing
temperature of 48 . The

Refrigeration
HW #2
Due date: 10/6/2016
1. A two-stage ammonia system using flash-gas removal and intercooling operates on the cycle shown in
Fig. 1. The condensing temperature is 36oC. The saturation temperature of the intermediate-temperature
evaporator

Refrigeration
HW #1
Due date: 9/29/2016
1. R-22 is the working fluid in a standard vapor-compression cycle for which the evaporator temperature is 0oC
and the condenser temperature is 40oC. The refrigeration capacity is 30.0 kW. Determine the followings:

Heat Transfer
(MECH 311 (02)
S i
Spring,
2016
Instructor: Choi, Wonjoon
wojchoi@korea.ac.kr
Application-Examples 1
1. Conduction for Plane Walls
1. As shown in the sketch below, the ice skating surface is comprised of a layer of ice, Lice = 7 cm, on top o

Korea University
School of Mechanical Engineering
2016 Heat Transfer
Homework #1
Due date : March, 30 (2016/03/30)
In class : 5 pm
Problem 1. (Hint: (a) heat transfer in plane wall and (b) fin analysis)
Problem 2. (Hint: Thermal resistance in serial & par

Korea University
School of Mechanical Engineering
2016 Heat Transfer
Homework #5
Due date : May, 25 (2016/05/25)
In class : 5 pm
Problem 1. (Hint: Natural convection on vertical plates)
During a winter day, the window of a patio door with a height of 1.8

Korea University
School of Mechanical Engineering
2016 Heat Transfer
Homework #4
Due date : May, 16 (2016/05/16)
In class : 5 pm
Problem 1. (Hint: External convection: flat plate)
Air at 24 C flows over a flat plate. The plate is kept at a constant temper

Refrigeration
HW #1
Due date: 9/22/2015
1. R-22 is the working fluid in a standard vapor-compression cycle for which the evaporator temperature is
5.0oC and the condenser temperature is 45oC. The refrigeration capacity is 40.0 kW. Determine the
followings