Q4/ Determine the heat transfer rate for the following parallel-flow heat exchanger specification Cold flow enters at 40-C, Cc= 20,000 W/K. Hot water enters at 150 -C, Ch= 10,000 W/K A-30/m², U-500 W/m². k.
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- Inside a wall measuring N/Sx N /3m, there are 2(glass thickness lcm) single-glazed windows measuring 1.5 m x 3 m with a heat transfer coefficient of K there is a window. The ambient temperature on the inside of the wall is N20C, the outdoor temperature is - N3 oC, the coefficients of external and internal convection are aş= N W/m2 C, aic = N/3 W/m2 C is. The wall is from the outside to the inside, 0.1N cm. the outer plaster with a thickness of k= 0.3N W/ moC, with a thickness of N/ 2 cm k = 0.8 W/moC reinforced concrete is composed of 1 cm thick k= 0.6 W/m oC gypsum honey inner plaster.Find out the total heat loss. To reduce heat loss by 80%, k= How many cm of insulating(styrofoam) material with an oC of 0.001(N+N2 )W/m should be N=26 used(calculations will be made for single and double glazing. My greatest achievement please heap the required amount of flow before and after it is made N2=9 N3=119are maintained at uniform temperatures of 300°C and 4 cm Tem 5 cm 10cm hem 100°C,respectively. Determine the rate of heat transfer through the wall and draw the thermal circuit. Q2) A double-pipe counter flow heat exchanger is to coo! ethylene glycol (Cp-2560J/kg.°C) flowing at a rate of 3.5 kg/s from 80°C to 40C by water (Cp-4180J/kg.°C) that enters at 20°C and leaves at 55°C. The overall heat transfer coefficient based on the inner surface area of the tube is Celd water 20C Hot glycel 250W/m2.°C. Determine: 15gs (a) The rate of heat transfer. (b) The mass flow rate of water. (c) The heat transfer surface area on the inner side of the tube. Q3) A(10 m) long section of a 0.05m diameter horizontal hot water pipe passes through a large room whose temperature is 22°C. If the temperature of the outer surface of the pipe is 65°C, determine the rate of heat loss from the pipe by natural convection? The properties of air at 43.5°C is k = 0.02688 W/m.°C, u = 1.735 10 m /s, Pr = 0.7245.…100°? air flows through a round aluminum tube of ID 60mm and OD 80mm at 4 ?? .The tube is covered in 5mm thick fiberglass insulation. The tube is surrounded by RT air flowing at 5?? over the outside of the insulation. What is the heat rate through the wall of the tube? Assume that the air temperature is constant throughout the tube. Note: RT is 25 celsius
- A well-mixed, insulated water storage tank is to be maintained at internal temperature 60°C. The environmental temperature around the tank varies from -25°C to 30°C. The tank's exterior surfaces (total = 125 m²) have four different levels of insulation as indicated in the table. Surface Component Area, Effective RSI, 2 2 m². °C/W m² Surface A 60.0 Surface B 30.0 Surface C 30.0 Surface D 5.0 Say that just one surface can be selected to have its insulation upgraded such that its effective RSI would be doubled. Which should be selected to achieve the greatest reduction in heat loss? 10.0 15.0 4.0 0.51 Ii. In. O O 1:10 O E:10 bgås ui - 2_5271793917405171255 H.W • In an air standard Otto cycle the maximum and minimum temperature are 1400 C and 15 C .the heat supply per Kg of air is 800 Kj .calculate the compression ratio and the thermal efficiency .also the ratio of maximum to minimum pressure في دورة أوتو القياسية للهواء تكون درجة الحرارة العظمی والصغرى 1400 درجة مئوية و 15 درجة مئوية ، ويكون إمداد الحرارة لكل كيلوجرام من الهواء 800 كیلوجول. أحسب نسبة حرارية ، وكذلك نسبة الضغط الأقصي إلى الأدنی PV =C تعلیقات ملاحظات HW + 17 16 15 14 A II >Q4: Consider the heat flow in one direction (x-axis) through the composite wall shown in Figure Q4. Draw the thermal circuit then determine T1 and T2, and the heat flux (q, W/m2), knowing that the thermal conductivity of the Fir (0.11 W/m.°C), the concrete cinder block (0.76 W/m.°C), the building brick (0.69 W/m.°C) and the yellow pine (0.147 W/m.°C). Consider also the concrete cinder block and building brick sections are of equal thickness.
- Air flows from a 10 cm pipe in which the temperature and pressure are 4-C and 280 kPa, respectively, into a 5 cm pipe in which the pressure is 147 kPa gage. Calculate the velocity and discharge in each pipe, assuming isothermal conditions, standard atmospheric pressure and no losses. The gas constant for air is 287 N-m/kg-K.11. Change 15°F to degree kelvin Complete FBD, FORMULA, AND SOLUTIONCalculate the heat transfer rate (in W) from a 1,180 ft2, 7 in. thick concrete wall with inside and outside surface temperatures of 22°C and 6°C. W
- 4. An ideal vapor-compression heat pump cycle with Refrigerant 134a as the working fluid provides 15 kw to maintain a building at 200°C when the outside temperature is 50°C. Saturated vapor at 2.4 bar leaves the evaporator, and saturated liquid at 8 bar leaves the condenser. Calculate (a) The power input to the compressor, in kW (b) The coefficient of performance. (c) The coefficient of performance of a reversible heat pump cycle operating between thermal reservoirs at 20 and 50°C. (h, = 244.09kJ/kg, s, = 0.9222 kl/kg – K; h2 = 268.97 kJ/ kg; h, = 93.42 kJ/ kg) %3DA steel tube with 5 cm ID, 7.6 cm OD and k=15W/m °C is covered with an insulative covering of thickness 2 cm and k 0.2 W/m °C. A hot gas at 330° C with h = 400 W/m2oC flows inside the tube. The outer surface of the insulation is exposed to cooler air at 30°C with h = 60 W/m2oC. Calculate the heat loss from the tube to the air for 10 m of the tube and the temperature drops resulting from the thermal resistances of the hot gas flow, the steel tube, the insulation layer and the outside air.Do a quick calculation of the thermal conductance (U value) across a cavity wall consisting of:1. Outer skin 220mm brickwork (North facing, exposed aspect) 2. 20mmcavity 3. Inner skin of 10mm plasterboard Compare this with the worked example of an insulated brick veneer wall in the worked example. Show your working.