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: 42 oC with convection heat transfer coefficient of 9.0 W/m2 K. Solar radiation incident on the…

A: given:T0=45CT∞=42C h=9w/m2kthickness l=25cm

Q: 1-17 A 15-cm-diameter aluminum ball is to be heated from 80°C to an average temperature of 200°C.…

A: Given data Diameter(d)=15cm=0.15m Radius(r) = 7.5cm=0.075m Initial temperature (Ti)=80 oC Final…

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

A:

Q: Water with a temperature of 15 ° C approaches vertically to a cylinder with a surface temperature of…

A: Given- Ts=120∘CTW=15∘Cd=25mm=0.025mV=1m/sPr=5.16ν=0.76837×10-6m2/s

Q: A 25-kg iron ball with a temperature of 95°C is placed in a container with water whose mass is 40…

A: Given data, Mass of the iron ball, miron = 25 kg Initial temperature of the iron ball, Tiiron=95 °C…

Q: Piston Water P1 A piston cylinder system initially contains 1.6 kg of water at 0.25 MPa ad 40%…

A:

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: 1-16 A 15-cm x 20-cm circuit board houses on its surface 120 closely spaced logic chips, each…

A:

Q: Assume the price of coal is 0.04 $/kp and that this coal has a heat of combustion of 28 MJ /kg. What…

A:

Q: Q2) Consider a 150-W incandescent lamp. The filament of the lamp is 5-cm long and has a diameter of…

A: The heat released by lamp is The length of the lamp is The diameter of filament is The diameter of…

Q: Consider a large plane wall of thickness L = 0.4 m, thermal conductivity k = 2.3 W/m · °C, and…

A: Concept Of Heat Transfer Used

Q: Thermodynamics During a process 1-2 of a closed system, 200 Btu of heat is added to the system and…

A:

Q: On a summer day, in Phoenix, Arizona, the inside room temperature is maintained at 20° C while the…

A: Given data as per question Inside temperature =200cOutside air temperature=43.30c

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: A 5-cm-external-diameter, 10-m-long hot water pipe at 80°C is losing heat to the surrounding air at…

A:

Q: A circuit board houses on its surface 120 closely spaced logic chips, each dissipating 0.12 W. If…

A:

Q: Determine the energy transferred by conduction in 31 minutes, between the two faces of a concrete…

A:

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: given data flat surface temperature  Ts=30° hot air temperature  Ta=80° Surface area A=(2x4)= 8m2…

Q: Hot air at 79.0 oC is blown over a 3-m by 5-m flat surface at 34.9 oC. If the average convection…

A:

Q: Consider the rate of heat conduction through a double-paned window that has a 1.4-m2 area and is…

A:

Q: The outside surface of a satellite with an emissivity of 0.90 receives a solar radiant flux of 1260…

A:

Q: A body whose surface area is 0.65 m2 and the temperature is 175ºC is placed in a large chamber whose…

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: 2–105 The outer surface of a spacecraft in space has an emis- sivity of 0.6 and an absorptivity of…

A: Given      Emissivity = 0.6   Radiation, Q  = 1000 W/m2 Find    Surface temperature, T

Q: . Consider a person standing in a room at 25°C. Determine the total rate of heat transfer and the…

A:

Q: the expression for temperature distribution in the plate

A: Given; Uniform heat=80MWm3 having a thickness=20mm=0.2 mTleft=1600 CTright=1200 CK=200 W m-1k-1

Q: 1-30 A 4-m x 5-m x 7-m room is heated by the radiator of a steam heating system. The steam radiator…

A:

Q: A windmill is attached to an electric generator that produces an average electric power of 5 kW. The…

A: Given Estored  =1.27 x 105 K J Ein=5 kW Qout=? t= 8h

Q: Calculate the work done by a gas if it expands from volume 1m3 to 2m3 at constant atmospheric…

A: given data:-  inital volume = 1 m^3 final volume = 2 m^3 find the work done by a gas at atmospheric…

Q: It is commonly recommended that hot foods be cooled first to room temperature by simply waiting a…

A:

Q: Two surfaces of a 2-cm-thick plate are maintained at 0°C and 80°C, respectively. If it is determined…

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

A: Given data: Temperature of ambiend air, Ta = 80 °C Plate surface temperature, T = 30 °C Area of the…

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.