subject
Engineering, 26.09.2019 19:30 bellebug6208

Acold storage room is used to keep the temperature inside the room maintain at low temperature.
therefore, the special wall must be used to reduce the heat transfer rate in order to minimise the energy
consumption. a 3 m and 7 m wide wall consists of 17 cm x 24 cm cross section horizontal bricks where
thermal conductivity of the brick is given as k=0.77 w/m. k. the wall is separated by 2 cm thick layers of
cement where thermal conductivity is given as k = 0.33 w/m. k. each side of the bricks are also being covered
by the cement (2 cm thick). there are 5 cm polystyrene foam is used at the left side of the wall where k=
0.0011 w/m. k. the indoor temperature and outdoor temperatures are -5°c and 30°c respectively. the
convection heat transfer coefficients on the indoor and outdoor are h1=11 w/m²k and h2=23 w/m².k
respectively. assuming one dimensional heat transfer and disregarding radiation heat transfer, determine
the rate of the heat transfer through the wall (for one cell of bricks).


Acold storage room is used to keep the temperature inside the room maintain at low temperature.

ansver
Answers: 3

Another question on Engineering

question
Engineering, 04.07.2019 18:10
Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10
Answers: 1
question
Engineering, 04.07.2019 18:20
The characteristic roots of a dynamic system are: 1.7920 1.8160 i, -1.7920 1.8160 i, -0.4160 what is the order of this system? what are the settling time and damping ratio of the system?
Answers: 3
question
Engineering, 04.07.2019 18:20
Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
Answers: 1
question
Engineering, 04.07.2019 18:20
Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.
Answers: 3
You know the right answer?
Acold storage room is used to keep the temperature inside the room maintain at low temperature.
Questions
question
History, 25.03.2020 06:29
question
Mathematics, 25.03.2020 06:29