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: A high reservoir holds water. Water travels from this reservoir down via a big conduit to a turbine…

A:

Q: Inside of a room, the atmospheric pressure measures out to be 100 kPa. A pipe with a diameter of 0.5…

A:

Q: refrigeration system absorbs heat from a space at 5 °C at a rate of 25 kW and rejects heat to water…

A: The temperaturer of the refrigerating space is .The heat taken from refrigerating space is .The mass…

Q: During the power stroke of a non-flow energy system, the internal energy of the working fluid is…

A: Please refer next page for the answer.

Q: A hydroelectric power plant is used to convert energy from flowing water initially stored in a…

A:

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: The enthalpy of steam entering the turbine inlet is 2750 kJ/kg and leaving turbine at 1750 kJ/kg.…

A: Given data  enthalpy of steam at the inlet of the turbine (h1) = 2750 kJ/kg enthalpy of steam at the…

Q: A steady-flow thermodynamic system receives 100 lbm/min of fluid at 30 psia and 2 ft^3/lbm and…

A: The steady flow energy equation can be used to evaluating the power generated during the flow.

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: A fan-cooled computer contains eight printed circuit boards, each dissipating 10 W of power. The…

A:

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: 9. A turbine receives steam at 2778.1 kJ/kg enthalpy and then converts it to shaft work. The steam…

A: To determine the power produced by the turbine.

Q: Steam enters 0.90 MW turbine at 400 °C and 3000 kPa with a velocity of 280 m/s and leaves at 200 °C…

A: This problem is related to fluid mechanics. Fluid mechanics is the subject of mechanical engineering…

Q: Water vapor at 20000 kg / hour flow enters a steam boiler with a specific volume of 225 kPa 0.7565…

A: Write the given information. Write the properties of eater at 223 kPa. The enthalpy of the steam…

Q: A dam with a hydraulic turbine–generator located 40 m below the water surface has a rate of 4600…

A: Given that: Elevation = 40 m Mass flow rate = 4600 kg/s Electric power output = 1400 kW Generator…

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: A centrifugal air compressor receives a gas at a rate of 6 m3 /min and compresses it from 90 kPa to…

A:

Q: Water enters a pump at 350 kPa at a rate of 1 kg/s. The water leaving the pump enters a turbine in…

A:

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

A:

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

A: The properties at the inlet are marked with 1 as the subscript and the properties at the outlet are…

Q: A water jet that leaves a nozzle at 50 m/s at a flow rate of 100 kg/s is to be used to generate…

A: Data given-  m• = 100 kg / s  V = 50 m/s

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: The power extracted from the fluid by the turbine (points 1 and 2 are as shown in the figure: z1=35…

A: Power Consumed = Density * Flow * Head

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

A: Answer: The specific internal energy is -20 kJ/kg (Decreases). Hence, the correct answer is option…

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.