A circuit board houses on its surface 120 closely spaced logic chips, each dissipating 0.12 W. If the heat transfer from the back surface of the board is negligible, calculate (a) the amount of heat this circuit board (15 cm x 20 cm) dissipates during a 10-hour period, in kWh, and (b) the heat flux on the surface of the circuit board, in W/m2.

Q: Air at 27 Celsius degree receives heat at a constant volume until its temperature reaches 927…

A: Given: T1=27°CT2=927 °C

Q: A man goes to a traditional market to buy a steak for dinner. He finds a 12‑oz steak (1 lbm = 16 oz)…

A: Write the expression of the unit cost of the steak from the traditional market.

Q: The inner and outer glasses of a 2-m × 2-m double pane window are at 18°C and 6°C, respectively. If…

A: Given data: The area of the inner and the outer glasses is A=2 m×2 m= 4 m2 The space between the two…

Q: The inner and outer surfaces of a 0.5-cm-thick 2-m × 2-m window glass in winter are 10 °C and 3 °C,…

A: thickness = 5 cm Area = 2 m x 2 m thermal conductivity = 0.78 W/mC Time = 5 h

Q: Hot air at 80°C is blown over a 2-m x 4-m flat surface at 30°C. If the average convection heat…

A: GivenTa=80oCTs=30oCA=2m×4mh=55 W/m2 Co

Q: The density of a fluid decreases by 5 percent at constant pressure when its temperature increases by…

A:

Q: Max likes to drink tea. He uses his kettle to heat 1.6 liters of water from 18°C to 100°C every day.…

A: Heat transfer: the transfer of heat from one body to another body due to the temperature differences…

Q: Calculate the amount of energy dissipated by an average adult person sleeping for 8 hours if he or…

A: Write the given data with suitable variables: t=8 hrsA=18.1 ft2e=0.7 met

Q: Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel.…

A:

Q: Calculate the quantity of heat to be transferred in BTU to 3 kg of brass to raise its temperature…

A:

Q: TransPipe company is going to transport a flammable liquid. It is known that this liquid is being…

A: Giveninner diameter di=10mheta added Q=20kWspecific heat C=2.5kJ/kg Kdensity of the liquid…

Q: Five kg of air absorbs 50 Joules of heat at constant volume. During this process, the temperature…

A: According to First law of Thermodynamics(also known as Energy Conservation law or Joule's law or…

Q: A 20lbm object is located 300 ft above the ground. What is the potential energy of the object in…

A:

Q: A window is replaced by a wall with thick insulation. The thermal conductivity of the same area will…

A: As per policy, one question can be answered. Hence, first question is answered.   Given, Thermal…

Q: When an object of 4 kg changes it’s velocity from 10 to 30 m/s, what is its kinetic energy change…

A: mass m=4kg initial velocity V1=10m/s final Velocity V2=30m/s To Find the kinetic energy change in KJ

Q: Calculate the amount of energy (in BTU) required to heat the air in a house 26 ft by 29 ft by 42 ft…

A:

Q: A certain system dissipates 250 BTU of heat to the surroundings. If the increase in internal energy…

A:

Q: A layer of pulverized cork 152-mm thick is used as a layer of thermal insulation in a flat wall. The…

A: GIVEN :- thick : t=152 mm  The temperature of the cold side of the cork : TC= 4.4℃, The temperature…

Q: A man goes to a traditional market to buy a steak for dinner. He finds a 12-oz steak (1 lbm = 16 oz)…

A:

Q: As shown in the figure, a 300-ft³ tank contains 25 lb of H20 initially at 30 lbf/in?. The tank is…

A:

Q: A cool box made of a material, having Thermal Conductivity of 0.22 W/m.°C has a total area of 3.9 m²…

A: Given Data Thermal conductivity of material is :k=0.22 W/m°C Total area is :A=3.9 m2 Initial…

Q: The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thick, and is made of a…

A:

Q: A 1.5-kW electric resistance heater in a room is turned on and kept on for 20 min. The amount energy…

A: Given  A 1.5-kW electric resistance heater in a room is turned on and kept on for 20 min. To…

Q: A 3-kW resistance heater in a water heater runs for 2 hours to raise the water temperature to the…

A: Given Data: The power of the heater, P = 3 kW. The time to raise the temperature, t = 2 h.…

Q: Hot air at 80°C is blown over a 2-m x 4-m flat surface at 30°C. If the convection heat transfer…

A:

Q: 18. An aluminum pan whose thermal conductivity is 237 W/m · °C has a flat bottom whose diameter is…

A: The problem is based on heat transfer and can be solved as:

Q: A system undergoes process a process in which the heat transfer to the system is 30 KJ and the work…

A: Following sign conventions are considered in Thermodynamics: Heat transfer to the system is positive…

Q: A 4-kW resistance heater in a water heater runs for 3 hours to raise the water temperature to the…

A: given:P=4KWtime T=3hours

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.