Calculate the heat transfer in kj per hour through a solid brick wall 9 cm, 3 m high and 219 mm thick, when the outer surface is at 5C and the inner surface 17C, the coefficient of thermal conductivity of the brick is 0.6 W/m-K.
Q: 3. An aluminum thin film is deposited onto an 8" diameter silicon wafer by thermal evaporation from ...
A: Since you have [posted a question with multiple sub-part we will solve first two sub=part for you....
Q: ᴀ ꜱᴛᴇᴇʟ ꜱʜᴀꜰᴛ 2569 ᴍᴍ ʟᴏɴɢ ᴍᴜꜱᴛ ᴛʀᴀɴꜱᴍɪᴛ ᴀ ᴛᴏʀQᴜᴇ ᴏꜰ 34 ᴋɴ-ᴍ. ᴛʜᴇ ᴛᴏᴛᴀʟ ᴀɴɢʟᴇ ᴏꜰ ᴛᴡɪꜱᴛ ᴀɴᴅ ᴛʜᴇ ᴍᴀxɪᴍ...
A:
Q: Two swimmers A and B, of weight 190 lb and 125 lb, respectively, are at diagonally opposite corners ...
A:
Q: PROBLEM 1 Seventy kilojoules of work is done by each kilogram of fluid passing through an apparatus ...
A:
Q: The working substance for a Càrnot eycle plume at the beginning of isothermal expansion is 9 cu ft n...
A: m=8lbv1=9ft3P1=300Psi=300×144lbt/ft2 2feet =12inchv2v1=2 v2=2v1=18ft3T3=T4=90°f=305.37kfor process ...
Q: Determine the hydrostatic force and its location by (a)integration method and (b)formula method.
A:
Q: What are the basic components of Rankine Cycle and draw TS diagrams?
A: Rankine cycleit is a vapour power cycle working fluid undergoes a change in phase in which heat co...
Q: A reaction turbine is working under a head of 10 m with an average discharge of 700 m'/min. The over...
A: Given:h=10 mQ=700 m3/minηo=0.9N=200 rpm
Q: Deflection of Heli.cal springs use astinglion's theorg to Prove y3=
A:
Q: A skier starts from rest on the 45° slope at time t = 0 and is clocked at t = 2.14 s as he passes %3...
A:
Q: According to the figure where a mass M = z/100 kg on the frictionless floor is being pushed by horiz...
A: given; →mass(M)=z100kg→mass (m)=3kg→required force=F→coefficient of static friction (μs)=0.5→coeffic...
Q: A spark ignition engine of a compression ratio of 8 , operates with stoichiometric fuel-air ratio of...
A: Given: compression ratio r=8 P1=1 atmosphere and T1=350 K residual gas fraction f=0.08 and the exha...
Q: 1. The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isotherma...
A:
Q: Explain the “4C’s” practised as part of current Good Manufacturing Practice (cGMP) to prevent cross ...
A:
Q: The bar supported by a pin at B and a cable at A carries a load of 260 N at C. Neglecting the weight...
A:
Q: In a boat race , boat A is leading boat B by 64.5m and both boats are travelling at a constant speed...
A:
Q: Problem #1. During a heating process, the temperature of a system rises by 10°C. Express this rise i...
A: Rise in temperature, ∆T=10oC
Q: 11. Ammonia vapor is compressed in a dosed system from 15 psia, 3 cu ft, to 150 psia 0.4 cu ft. acco...
A:
Q: Use the graphical method to construct the shear-force and bending-moment diagrams for the beam shown...
A:
Q: Calculate the lattice constant of the alloy you found in part (a). Assume the alloy and its end memb...
A: Given data, The alloy is Zinc Blende (ZnS) Atomic radius of ZnS, aZnS=5.409 A° To determine, the lat...
Q: The Barometric Pressure is given 29.89 in Hg. Convert it into, a. 5 psia to in Hg vacuum b. 100 ...
A: We have given barometric pressure of 29.89 in Hg, we know that, Absolute pressure=gauge pressure+atm...
Q: Problem 1. A 15-kips homogeneous, rigid block is supported by three symmetrical rods as shown in the...
A: FOR SOLUTION REFER BELOW IMAGES.
Q: Steam at 200 deg. C and with an entropy OF 5. 6105 kjlkg-k expands isothermally to 0.515 Mpa. For 5n...
A:
Q: An airplane is flying at a velocity of 130 mph at a standard altitude of 5,000 ft. At a point on the...
A:
Q: 2 ft F D E -1.5 ft 600 lb 300 lb -3 ft -3 ft-
A:
Q: 1. The truss shown below is supported by a pin at joint A and a roller at joint K. Find the forces i...
A: given; lets take reaction force at A=RAlets take reaction force at L=RLAG=12mAM=5mlake tension force...
Q: 4-74. The caster wheel is subjected to the two couples Determine the forces F that the bearings exer...
A:
Q: The pin for the hinge support the allowable shear stress is 200 Mpa. Design the diameter of the pin ...
A: Given:ζ=200 MPaTo determine the diameter of the pin
Q: The rigid beam is supported by the three suspender bars. Bars AB and EF are da made of aluminum and ...
A:
Q: EXAMPLE 1: DETERMINE THE RESULTANT COUPLE MOMENT 15 10 3 m 5 4 3 30 3 m A 1m 30 4 3 10 15 B.
A: Moment = Force X Perpendicular Distance Let Clockwise moment is positive. Counter clockwise moment i...
Q: ) A 5 lb ball is attached to a 3 ft long rope and it rotates in a vertical circular path at a consta...
A:
Q: A thermal power has a net power 10 MW. The backwork ratio of the plant is 0.005. Determine the compr...
A:
Q: A bearing supports a 28mm diameter solid steel torsion rod (plan view shown in Fig. 1) rigidly comme...
A: Given data Diameter =28mmarm=300mmvertical load=2500 N
Q: e yield strength for an alloy that has an average grain diameter of 4.1 × 10-2 mm is 131 MPa. At a g...
A: Given:σ1=131 MPaD1=4.1*10-2 mmD2=7.6*10-3 mmσ2=246 MPaσ=236 MPa
Q: Henry's constant for air at 25 C is ____orders of magnitude higher than hydrogen sulfide
A:
Q: Consider a turbojet-powered airplane flying at a standard altitude of 4 km. The inlet and exit areas...
A:
Q: A rod is composed of of aluminum and steel section as shown in the figure. If an axial load of 20 kN...
A:
Q: A 15-cm diameter copper ball is to be heated from 100°C to an average temperature of 150°C in 20 min...
A:
Q: 1. A car is parked on an incline. The car has weight W centered at G. For full credit, you must draw...
A: FBD of car, RA = RB = (W/2) cos(θ) For slipping, Take sum of forces in X direction =0, -W sin(θ) + ...
Q: A skier starts from rest on the 43° slope at time t = 0 and is clocked at t = 2.40 s as he passes a ...
A:
Q: Complete the two charts below showing the perpendicularity tolerance for the different pilot sizes. ...
A: PART 1: Virtual condition size=Shaft Maximum material condition+perpedicularity tolearnce⇒Virtual co...
Q: * The governing equations of a mass-spring vibrating system with two masses are: yi' = -2y1 - y2 y" ...
A: Given : To find : Frequencies and relative displacements
Q: Steam flows isentropically through a nozzle from 1500 kPa, 288 deg.C to 960 kPa. For 454 g/s, determ...
A: Given: Steam flows through a nozzles isentropically for which Pressure at inlet, P1 =1500 kPa Tempe...
Q: A reaction turbine is working under a head of 10 m with an average discharge of 700 m/min. The overa...
A:
Q: Use the graphical method to construct the shear-force and bending-moment diagrams for the beam shown...
A: To know the variation and maximum value of shear force and bending moment, V and M diagram are drawn...
Q: What is her friend’s location, (magnitude and direction) relative to her house? (Ans. 667.54 ft, 21....
A: Need to calculate magnitude & direction.
Q: Determine the force in member BF.
A: Need to find the force ( Member BF)
Q: Saponification is a process wherein soap is added to a certain type of oil to produce grease. One su...
A:
Q: 4) A 15ft W12x40 steel column is supported by a steel base plate, concrete pedestal and concrete foo...
A: Given: length of the steel column=15ft=180in cross sectional area of the columnA=11.7 in2 axial comp...
Q: A steel shaft 2550 mm long must transmit a torque of 34 KN-m. The total angle of twist and the maxim...
A:
Step by step
Solved in 2 steps with 2 images
- A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss from the pipe occurs by radiation (=0.6) and natural convection (hc=25W/m2K). Determine the percentage of the total heat loss by these two mechanisms.Show that the rate of heat conduction per unit length through a long, hollow cylinder of inner radius ri and outer radius ro, made of a material whose thermal conductivity varies linearly with temperature, is given by qkL=TiTo(rori)/kmA where Ti = temperature at the inner surface To = temperature at the outer surface A=2(rori)/ln(ro/ri)km=ko[1+k(Ti+To)/2]L=lenthofcyclinder3.16 A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is and on the other side is . If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it takes for the copper plate to reach a temperature of 82°C.
- 1.39 On a cold winter day, the outside wall of a home is exposed to an air temperature of when the inside temperature of the room is at . As a result of this temperature gradient, there is heat loss through the wall to the outside. Consider the convective heat transfer coefficients for the air inside the room and at the outside wall surface to be, respectively, 12.0 and . If the composite room wall is modeled as a plane wall with a thermal resistance per unit area of , determine the temperature at the outer surface of the wall as well as the rate of heat flow through the wall per unit area. If the homeowner were to consider using a fiberglass insulation layer on the inside wall surface for reducing this heat loss by 50%, what is the required thickness of this layer and the outside wall temperature for this case?The heat transfer rate from hot air by convection at 100C flowing over one side of a flat plate with dimensions 0.1m0.5m is determined to be 125 W when the surface of the plate is kept at 30C. What is the average convection heat transfer coefficient between the plate and the air?The interior wall of a large, commercial walk-in type meat freezer is covered under normal operating conditions with a 2-cm thick layer of ice. One day, a power outage cuts electricity to the refrigeration system of the freezer. Estimate the time required to melt this layer of ice if it has a mass density of 700kg/m3 and a latent heat of fusion of 334 kJ/kg. Consider the air temperature inside the freezer to be 20C with a heat transfer coefficient of 2W/m2K for convection from the freezer surface to air, and clearly state the assumptions made in your calculations.
- 1.29 A spherical interplanetary probe with a 30-cm diameter contains electronic equipment that dissipates 100 W. If the probe surface has an emissivity of 0.8, what is its surface temperature in outer space? State your assumptions in the calculations.2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1 m wide and 1 m tall. The fins are to be rectangular in cross section, 2.5 cm long and 0.25 cm thick, as shown in the figure. There are to be 100 fins per meter. The convection heat transfer coefficient, both for the wall and the fins, is estimated to be K. With this information determine the percent increase in the rate of heat transfer of the finned wall compared to the bare wall.Calculate the heat transfer in kj per hour through a solid brick wall 7 cm, 3 m high and 218 mm thick, when the outer surface is at 5C and the inner surface 17C, the coefficient of thermal conductivity of the brick is 0.6 W/m-K. Add your answer
- A 2x2-m glass window, 1 cm thick is subjected to 10°C and 3°C inner and outer temperatures respectively. If the thermal conductivity of the glass is 0.78 W/m-°C, what is the amount of heat loss, in kl, through the glass over a period of 5 hours?An isolating wall (made up of 2-10mm thick plywood with 5mm woven silica sheet in between) encloses a steam-room to prevent the outside area from having the same temperature as the inside of the room. If the total area of the wall is 100 sq.m. and coefficient of thermal conductivity (k) for plywood and silica sheets are 0.12 and 0.015 W/mK respectively, what is the rate of heat transfer if the inside temperature is 800 °C while the outside is 42°C? answer must be in WattsAn isolating wall (made up of 2-10mm thick plywood with 5mm woven silica sheet in between) encloses a steam-room to prevent the outside area from having the same temperature as the inside of the room. If the total area of the wall is 100 sq.m. and coefficient of thermal conductivity (k) for plywood and silica sheets are 0.12 and 0.015 W/mK respecțively, what is the rate of heat transfer if the inside temperature is 800 °C while the outside is 42°C? answer must be in Watts * Your answer