There are 3 windows in a room with a width of 100 cm and a height of 150 cm. There is a single glass (k=0. 9 W/mK) of 5 mm thickness in the windows initially. Instead of these glasses to save heat You are considering replacing it with double glazing consisting of 5 mm glass and 12 mm air (k=0.022 W/mK). Indoor and outdoor environment temperatures are 20 0C and -10 0C, respectiv

Q: 4. A car engine with the dimensions 0.6 m high, 0.50 m-wide, and 0.8-m- long. The bottom surface of…

A: Data given-

Q: The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8…

A: Write the given data Note the relative velocity of the air will be same as the velocity of the…

Q: 8. Hot water at an average temperature of 80°C and an average velocity of 1.5 m/s is flowing through…

A: a) to find : Total rate of  heat loss from the hot water. Given : average temp of hot water…

Q: Consider a 1.2-m-high and 2-m-wide glass windowwith a thickness of 6 mm, thermal conductivity k =…

A: Given data Length of the plate L = 1.2 m width of the plate = 2 m thickness of the plate t= 6 mm…

Q: At winter design conditions, a house is projected to lose heat at a rate of 60,000 Btu/h. The…

A: Given data     heat loss at a rate of =60000 Btu/h.     internal heat gain=6000 Btu/h.To determine…

Q: During a picnic on a hot summer day, the only available drinks were those at the ambient temperature…

A: Given data: Diameter of the can, d =2.5 in. Density of water at room temperature, ρ = 62.22 lbm/ft3…

Q: A 6-m-long section of an 8-cm-diameter horizontal hot-water pipe passes through a large room whose…

A:

Q: Question # 2: A10-m-long section of a 6-cm-diameter horizontal hot water pipe passes through a large…

A: Given data as per the question Length of section =10 m diameter =6 cm Tmean=65+222=43.50cconsidering…

Q: Addition of fins may not necessarily increase the heat transfer from a surface; it may even decrease…

A: Explaining the statement.

Q: Q2 : A hot surface at 100°C is to be cooled by attaching 0.25 3 cm long, 0.25 cm diameter aluminum…

A:

Q: A 5-m-wide, 4-m-high, and 40-m-long kiln used to cure concrete pipes is made of 20-cm-thick concrete…

A: caculate the inside area of the kilin as follows Ainside =2×40×4-0.4+1×40×5-0.4         =472…

Q: A 3-layered composite wall is consists of different materials. Inside is wall 1: 300 mm thick, k =…

A: Given: K1=1.5w/m-k L1=300mm=0.3m K2=3.5w/mk L2=0.2m K3= thermal conductivity of third wall L3=0.1m…

Q: In a new residential project, you strongly believe that double-paned windows are ‘better’ than…

A:

Q: Q1/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm) thick layers of…

A: Given data: Height of the window, h = 0.8 m. Width of the window, b = 1.5 m. The thickness of…

Q: Flat-plate solar collectors are often tilted up towardthe sun in order to intercept a greater amount…

A: Write the given information.

Q: 4.2. An average person generates heat at a rate of 84W while resting in a room at T-. Assuming one-…

A: Data given-  Qtotal =84 watt = 84 J /s  The room temperature T= 26°C  emissivity of the skin ε = 0.9…

Q: Hot water at an average temperature of 80°C and an average velocity of 1.5 m/s is flowing through a…

A: Given dataHot water average temperature Tavg = 800CAverage velocity of water Vavg=1.5m/secLength of…

Q: 4. A car engine with the dimensions 0.6 m high, 0.50 m-wide, and 0.8-m- long. The bottom surface of…

A:

Q: In many industrial applications, fins are currently being used to increase the rate of heat transfer…

A:

Q: A horizontal steel pipe having a diameter of 5 cm is maintained at a temperature of 50•C in a large…

A: Given data:-diameter of pipe, d=5cm=0.05mTemperature of pipe surface, Ts=50°C=323KWall temperature,…

Q: Consider a house that has a 10-m x 40-m base and a 4-m-high wall. All four walls of the house have…

A:

Q: Consider a 2-m-high electric hot-water heater thathas a diameter of 40 cm and maintains the hot…

A: Assumptions  Heat transfer is in only radial direction.  Conductivity of the foam insulation is…

Q: 9-86 Flat-plate solar collectors are often tilted up toward the sun in order to intercept a greater…

A:

Q: A transformer that is 10 cm long, 6.2 cm wide, and 5 cm high is to be cooled by attaching a 10…

A:

Q: Q1/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm) thick layers of…

A: As given that the area normal to heat transfer will be A=0.8×1.5 m2 ;⇒A = 1.2 m2 ;So the thermal…

Q: 25 W/m. C. Determine the rate of heat transfer from the surface for a Ix0.5 m section of the plate.…

A:

Q: List the various factors on which the W value of this coefficient depends. CO

A: The answer is given below

Q: A 6-m-long section of an 8-cm-diameter horizontal hot-water pipe shown in Fig. 9-16 passes through a…

A:

Q: Hot water at an average temperature of 80°C and an average velocity of 1.5 m/s is flowing through a…

A: Draw the figure of the given question.

Q: Four power transistors, each dissipating 12 W, are mounted on a thin vertical aluminum plate 22 cm *…

A: Given data as per question No. of transistors = 4 Heat dissipated by each transistor = 12 w…

Q: Consider a hot automotive engine, which can be approximated as a 0.5-m-high, 0.40-m-wide, and…

A: Given data as per question Height of automobile = 0.5m Width of vehicle =0.4 m Length of vehicle=0.8…

Q: The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8…

A: The properties of the air at the 30 degrees Celsius are,

Q: -5- For flow over a flat plate, the temperature distribution inside the boundary layer is given by:…

A: The given function is

Q: What is the physical significance of the Nusselt number? How is it defined? How is it used?

A: The value of Nusselt number represents heat transfer through the object by the pure conduction.…

Q: Hot water at an average temperature of 80°C and an average velocity of 1.5 m/s is flowing through a…

A: Note: As per our guidelines we are supposed to answer only the first 3 sub-parts. Kindly repost…

Q: 165mm W/m?-K ulated with several materials, and convection on the inside and outside of the pipe is…

A:

Q: How do you increase the heat transfer in a system with fins? What are the implications of these…

A: Explanation: Fins are the projections protruding from a hot surfaces into ambient air and they are…

Q: A 2m by 3m flat plate is suspended in a room, and is subjected to air flow parallel to its surfaces…

A:

Q: The temperature of a tank in the form of liquid nitrogen is -10 ° C. Tank diameter is 16 cm. The…

A: T = -10°C = 263 K D = 16 cm = 0.16 m Q/L = 65.5 W/m h = 4.35 W/m2.K e= 1

Q: Two pin fins are identical, except that the diameter of one of them is twice the diameter of the…

A: (a) The effectiveness of a fin can be expressed as, The ratio of effectiveness can be calculated…

Q: The temperature of a cylindrical tank containing liquid nitrogen is -10 ° C. Tank diameter is 16 cm.…

A:

Q: 6-21 A metal plate is being cooled by air (kuid = 0.259 W/m-K) at the upper surface while the lower…

A: Given Data,

Q: Consider a hot automotive engine, which can be ap- proximated as a 0.5-m-high, 0.40-m-wide, and…

A: Given: The width of the rectangular block, w = 0.4 m The length of the rectangular block, L = 0.8 m…

Q: sof? =120°Cand?

A: given:outer radius r2=7cminner radius r1=5cmthermal conductivity k=25W/mKT1=120CT2=50C

Q: A 5.0-cm-diameter cylinder is heated to a temperature of 200 oC, and air at 30 oC forced across it…

A: Given data: d=5 cmh=180 W/m2KT1=200°C=473 KT2=30°C=283 Kε=0.7T∞=10°C=283 K Need to determine the…

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.