Formulaes

F = 2U Σ Problem 3 A pilot-scale disc stack centrifuge is tested for recovery of bacteria. The centrifuge contains 25 discs with inner and outer diameters of 2 cm and 10 cm, respectively. The half-cone angle is 35. When operated at a speed of 3000 rpm with a feed rate of 3.5 litres per min, 70% of the cells are recovered. If a bigger centrifuge is to be used for industrial treatment of 80 litres per min, what operating speed is required to achieve the same sedimentation performance if the larger centrifuge contains 55 discs with outer diameter 15 cm, inner diameter 4.7 cm, and half-cone angle 45. HONORE 2Πω2(Ν – 1) 3gtano Q₁ Q₂ 2-2 >₁ 1₂ ||| (r³-ri)

PLS ANSWER ASAP, THANK YOU

Item 1 1 of 5 II Review Part A A flow-through electric water heater has a 22 kW electric heater inside an insulated 2.0-cm-diameter pipe so that water flowing through the pipe will have good thermal contact with the heater. Assume that all the heat energy is transferred to the water. Suppose the inlet water temperature is 12°C and the flow rate is 8.0 L/min (about that of a standard shower head). What is the outlet temperature? Express your answer in degrees Celsius. ? Tout = °C Submit Request Answer Provide Feedback Next >

silicon carbide (T ≈ 300 K): k = 490 W/m⋅K

ha T. R h Ta = 40 W/m °C %3D pipe L=1 m; R, = 0.05m; R2 = 0.052m; Tin = 70°C; Tout = 20°C; hn = 30 W/m2 °C; hout = 20 W/m2 °C; K The total thermal resistance of insulated steam pipe, if a 0.03m thickness of fiberglass insulation (K fibergias = 0.04 W/m. °C) is added to pipe to save heat losses. 3°C/W Ob - 2°CW -1°C/W Od. No answer is correct

One end of an iron poker is placed in a fire where the temperature is 502 degree Celsius and the other end is kept at a temperature of 6 degree Celsius. The poker is 1.2m long and has a radius of 0.005m. What is the amount of heat conducted from one end of the poker to the other in 5.0 s ( K of iron = 79Wm^-1K^-1).Ignore the heat lost along the length of the poker.

silicon carbide (T ≈ 300 K): k = 490 W/m⋅K .

heat flow through wall

R_1=67. The value of R_1in the given question is 67.so please add this value for R_1. Solution of the question should be detailed enough to understand.

ANSWER: 61.18 fahrenheit

Solve the heat equation subject to the given conditions.

The annual fixed costs for insulating a certain steam pipe installation can be expressed as Cf = 30S + 40 dollar per year where S is thickness of insulation in inches, and the annual cost of energy lost (annual direct costs) from the installation may be expressed in terms of the insulation thickness as Cp = 100/S $ per year. Determine the optimum annual insulation thickness cost.

2. Connect an iron whose base plate is made of an aluminum alloy. Assumptions: • 85% of the heat generated in the resistance wires is transferred to the plate. • The thermal properties of the board are constant. • The heat transfer coefficient is constant and uniform over the entire surface. Properties: The density, specific heat and thermal diffusivity of the aluminum alloy plate are p= 2770 kg / m³, cp = 875 kJ / kg. ° C and a = 7.3 x 10° m² / s. Data: L plate = 0.005m, Plate = 0.03m?, Device nominal power = 1kW, Tar = 22°C a) How long does it take for the plate temperature to reach 140°C? Assuming the plate temperature is uniform at all times. b) The effects of the heat transfer coefficient and the final plate temperature on the time it takes for the plate to reach this temperature should be investigated. Plot h × t and Tplate X t.

1. The log mean area for a l-inch schedule 40 steel pipe that is 0.50-m in length. a. 0.08990 m? b. 0.09391 m? c. 3.698×10-3 m2 d. 3.539×10-3 m? 2. What is the heat loss per m² of a surface area of an insulating wall composed of 50.0 mm thick brick (k = 0.69 W/mK) where the inside temperature is 352.7 K and the outside temperature is 297.1 K. a. 7.6728 W/m? b. 76.728 W/m? c. 767.28 W/m? d. 7672.8 W/m? 3. The maximum net transfer unit and Crin/Coa, of a particular parallel-flow heat exchanger is 4.00 and 1.00 respectively. Approximate the effectiveness of this heat exchanger. a. 80% b. 70% c. 60% d. 50% %3!

I want to know how much heat the tube lost due to the material it is made of. Even if it is a small difference in temperature. It is a heat transfer problem material: Aluminum temperature touching cylinder: 65 Celcius temeprature inside cylinder 64.5 celsius  room temperature 24 celcius Tube measurements  outer radius r1 r1 = 4 in inner radius r2 r2 = 3 in outer circumference C1 C1 = 25.132741228718 in inner circumference C2 C2 = 18.849555921539 in height h = 8 in wall thickness t = 1 in

A cross flow plate fin compact heat exchanger is to be used for this heat recovery application.  We wish to select a heat exchanger which will yield ε = 0.75, using stainless steel fin materials. Calculate the UA required to obtain ε = 0.75. Calculate UA by ε-NTU methods and state why the LMTD method is difficult to use. For the ε -NTU methods, first use the graphical method and then the equation.

I want to know how much heat the tube lost due to the material it is made of aluminum or steel. Even if it is a small difference in temperature. I want to know which material Conduct Heat the Best through this problem. material: Aluminum,  steel ( the dimensions are the same for both) temperature touching cylinder: 65 Celcius temeprature inside cylinder 64.5 celsius  room temperature 24 celcius Tube measurements  outer radius r1 r1 = 4 in inner radius r2 r2 = 3 in outer circumference C1 C1 = 25.132741228718 in inner circumference C2 C2 = 18.849555921539 in height h = 8 in wall thickness t = 1 in

As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 12. Ts.2} 1. Ts,1} Steam Insulation (a) If the insulation is 17.5 mm thick and its inner and outer surfaces are maintained at T,1 = 800 K and Ts,2 = 490 K, respectively, what is the rate of heat loss per unit length (q') of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (q'), in W/m, and outer surface temperature T.2, in K, for the steam pipe with the inner surface temperature fixed at Ts,1 The outer surface is exposed to an airflow (T = 800 K, inner radius ri = 0.06 m, and outer radius r2 = 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to = 0.1 m. large surroundings for which Tsur = T_ = 25°C. The surface emissivity of calcium silicate is approximately 0.8.

solve. heat transfer

Saturated steam at 3 atm will flow through a 3 in. Schedule 80 steel pipe. In order todecrease the heat losses to the surrounding air (at 20 oC) the pipe will be insulated. There are twotypes of insulating materials available, each with a thickness of 2.5 cm. Thermal conductivity ofinsulator A is 0.04 W/m.K and that of insulator B is 0.20 W/m.K. Both insulators will be used, inorder to have the least heat loss. Which insulator should be covered outside? Assume thatconvective heat transfer coefficient between the insulated pipe and air is 15 W/m2K.

Correction: C2 = 929466.79 W/m2

a. An air stream passing through a 2-inch (1/6 ft) diameter, thin-walled tube is to be heated by high- pressure steam condensing on the outer surface of the tube at 320 °F. The overall heat transfer coefficient, h between steam and air can be assumed to be 25 Btu/(ft2.hr °F) with the air entering at 100 ft/sec, 10 psia, 40 °F. The air is to be heated to 150 °F. Determine the tube length required. Assuming Rayleigh Line flow, calculate the static pressure change due to heat addition. Also, for the same inlet conditions, calculate the pressure drop due to friction, assuming Fanno flow in the duct with f = 0.018. b. c. d. To obtain an approximation to the overall pressure drop in this heat exchanger, add the two results. Discuss the accuracy of this calculation.

solve Temperature at mid-point of the fins.

NOTE: Solve this as soon as possible, need this urgently. Reg NO. = 26 Consider a plane composite wall that is composed of four materials (materials A, B,C, and D are arranged left to right) of thermal conductivities ka = 150, kg = 30- KR = mC 50 and kp = 70 The thicknesses of the four sections of the wall are XA = 2.5 cm, Xp = 7.5 cm, Xp = 7.5 cm, and xç where (A, = Ap). Draw thermal circuit and Apply fundamental concept of heat transfer to calculate the thickness of the plane wall xc for a Reg Noine 20kWhr + efo00 steady rate of energy lost (both conduction and convection) through these plane walls and the temperature of its inner, interface and outer surfaces for a day during which the surface 1 is maintained at 370°C while the temperature of the surface 2 is at 66°C respectively for a period of 10 hrs. Also Calculate the cost of that heat loss if the unit price of Reg Notine 10000 0.08s electricity is kWh +e T=370C T-66°C

Water going into a pipe with a tempeture of T1 and going out T2 . ambient tempeture is T0. Develop an expression for T2 ( based on heat transfer) Length of the pipe Lh0 - convective heat transfer coefficient of the airhW -convective heat transfer coefficient of the waterk- pipe thermal conductivity (W/m·K)d – pipe diameter  Use any other varilable that you need and can be found online easily .