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Mass = Density*volume
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- A 2 x 2 m flat plate solar collector for domestic hot water heating is shown in the figure. The incident solar radiation on the glass cover, which transmits 90% of the incident flux, is 750 W/m2. Water flows through the tubes soldered to the backside of the absorber plate, entering at a temperature of 25°C. The temperature of the glass cover is 27°C, and it radiates heat with an emissivity of 0.92 to the sky at –50°C. Additionally, the glass cover losses heat by convection to air at 20°C flowing over its surface at 30 km/h. Assume that the radiation heat transfer between the absorber plate and glass cover and the heat transfer through the back and sides of the collector is negligible.S 1 Calculate the critical contact angle for a pillar surface with a pillar diameter of 10 microns spacing (center to center) of 40 microns and height of 30 microns. Also, what is the expected apparent contact angle for water on the surface if its functionalized by a fluorosilane with a Young’s contact angle = 120º. The pillars are arranged in a square array.The room pictured has the following absorption coefficients at 500 Hz: Floor: Carpet, α = 0.14 Ceiling: Acoustic Ceiling Tile, α = 0.70 Walls: Gypsum Wallboard, α = 0.10 Reference image attached below. a. Calculate the total absorption in this room b. Calculate the room constant. c. Calculate the critical distance. Assume Q=4. d. A source generates a sound power level, LW, of 102 dB. The directivity, Q, is 4. What sound pressure level, Lp, would be measured at a distance of 6 m in the room above?
- A.) Temperature correction for the measured line. B.) Corrected length of the line.A theodolite has a tachometric constant of 100and an additive of zero. the center reading on the vertical staff held on point B was 2.292m when was sighted from A as shown in figure below. If the vertical angle was +25°and the horizontal distance AB equal 190.326m, calculate the other staff readings of B if a was 37.95m and the height of instrument 1.35mA diffuser in a pipe flow is basically a slow expansion of the pipe diameter, which slows down the fluid velocity and increases the pressure (the Bernoulli effect). Water at room temperature flows with a volume flow rate of 0.0250 m3/s through a horizontal diffuser in which the pipe diameter increases gradually from D1 = 6.00 to D2 = 11.00 cm. The irreversible head loss through the diffuser is estimated to be 0.450 m. The flow is turbulent, and the kinetic energy correction factors at both the inlet and outlet of the diffuser are assumed to be 1.05. Calculate the pressure difference P2 – P1 in units of kPa using the energy equation. (b) Repeat using the Bernoulli equation (ignore irreversible head losses and ignore kinetic energy correction factors—in other words, set the kinetic energy correction factors to 1). Calculate the percentage error in the result due to the Bernoulli approximation, and explain why (or why not) Bernoulli is applicable here. (c) It may be surprising that the…
- 9. A computer room located on the second floor of a five-storey office building is 10m X 7m. The exterior wall is 3.5m high and 10m long; it is a metal curtain wall (steel-backed with 10mm of insulating board), 75mm of glass fiber insulation, and 16mm of gypsum board The single-glazed window (U=5.9 W/m2-K) make-up 30% of the exterior wall. Three computer sets at 500 Watts each and 500 Watts of total lighting power in the room operate 24 hours per day. The indoor temperature is 20°C. Determine the following: a. The heat load, in Kilowatts, if the outdoor conditions is 32°C DB and 23°C WB. b. What would be the load, in Kilowatts, if the windows were double-glazed (U=3.5 W/m2•K)?Refer to Fig. 1214. The 3′′diameter orifice has coefficients of velocity and contraction of 0.950 and 0.632, respectively. Determine (a) the flow for the deflection of the mercury indicated and (b) the power in the jet.Determine the mass moment of inertia Iy of the solid formed by revolving the shaded area around the y axis. The total mass of the solid is 1500 kg.
- Question 2. A coal fired power station requires an ESP for dust removal from the flue gas. The influent flu gas has a concentration of 5200 mg/m3 of dust particles and a flow rate of 150 m3/s. The smallest particles in the gas stream are 1.5 um in diameter, and all particles have a dielectric constant of 5.5. The emission standard is 50 mg/m3. Assume a plate-to-plate spacing of 30 cm and an applied voltage of 15,000 volts. Each plate is 20 m long and 15 m high. Estimate –a) The particle drift velocityb) The required collection-plate area and number of plates required.Assume – Standard temperature and pressure.Q1. A room has dimensions 12 m x 14 m x 6 m and average absorptivity of the surfaces is a = 0.2 If an 3x10^(-2) W average output acoustic source is placed in the center of the front wall find out the value of critical distanceDetermine the product of inertia for the shaded area with respect to the x and y axes.