In climates with low night-time temperatures, an energy-efficient way of cooling a house is to install a fan in the ceiling that draws air from the interior of the house and discharges it to a ventilated attic space. Consider a house whose interior air volume is 720 m3  If air in the house is to be exchanged once every 20 minutes, determine (a) the required flow rate of the fan and (b) the average discharge speed of air if the fan diameter is 0.5 m..

Q: Water is pumped from a lake to a storage tank 15 m above at a rate of 70 L/s while consuming 15.4 kW…

A: The electric power supplied to the pump is The power supplied to the water by the pump can be…

Q: A refrigeration system absorbs heat from a space at 2 °C at a rate of 6.9 kW and rejects heat to…

A:

Q: Determine: (a) the magnitude of the pump power, in kW. W CV = 23.7625 x KW (b) the mass flow rate of…

A: dz = 25m m1.=50kg/sQcv.=-2kW Note: heat transfer from the system to the surrounding is taken as…

Q: In a gas turbine unit, the gases flow through the turbine at 13 kg/s and the power developed by the…

A: Given data: Mass flow rate of gas (m.)=13 kg/s The power developed by the turbine (P)=14000 kW The…

Q: Water flows through a shower head steadily at the rate of 8 kg/min. The water is heated in an…

A: Given:  mass flow rate of water = 8 kg/min = (8/60) kg/s = 0.133 kg/s initial cold water inlet, Tc1…

Q: Steam with quality 0.85 enters the condenser of a power plant at 20 kPa with a mass flow rate 10…

A: Given data:

Q: It is common knowledge that the temperature of air rises as it is compressed. An inventor thought…

A: The given statement is the Perpetual motion machine of 2nd kind which states that the machine will…

Q: In a steady flow apparatus, 135 kJ of work is done on each kg of fluid. The specific volume of the…

A:

Q: Determine the final temperature of the water at the second tank

A: here, I took some assumptions and some values of water's property.If there is change in its values…

Q: Air at a rate of 50 m3/min enters an adiabatic compressor at a pressure of 100 kPa and a temperature…

A:

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.