For an air-conditioning system, the outdoor and indoor design dry bulb temperatures are 45°C and 25°C respectively. The space to be air-conditioned Is 20m x 30m x 5m and infiltration is estimated to be one alr are 1.2 (kg of dry air)/m³ and 1.02 kJ/(kg of dry air) °C, then the sensible heat load due to Infiltration is, nearly
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For an air-conditioning system, the outdoor and indoor design dry bulb temperatures are 45°C and 25°C respectively. The space to be air-conditioned Is 20m x 30m x 5m and infiltration is estimated to be one alr are 1.2 (kg of dry air)/m³ and 1.02 kJ/(kg of dry air) °C, then the sensible heat load due to Infiltration is, nearly
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- 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 celsius4. 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 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 0.5
- Refrigerant-134a at 300 psia has a specific volume of 0.2235 ft³/lbm. Determine the temperature of the re- frigerant based on (a) the refrigerant tables, (b) the ideal-gas equation, and (c) the generalized compressibility chart.A 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.Q4)) A reservoir has an average area of 500 km², its evaporation estimated to be 75% of class A pan evaporation. The net radiation observed from the water in class A pan was 5.25 MJ/m?.day and the total latent heat for evaporation was 2.75 kJ/gm. Calculate the monthly evaporation of the reservoir in (Liters)? Also, determine how many people can be used this evaporated water if the per person consumption (160 L/cap/day)?
- For Ke = 0.577 in. H2O-min/ft and Ks = 0.00986 in. H2O-min-ft/gr, design a reverse-air baghouse to filter 20,000 cfm of air with 2.5 gr/ft3 of flour. Assume a cleaning time of 3.0 minutes and a filtration time of 60 minutes. In your design, specify the number of compartments, the maximum filtering velocity, the cloth area per compartment, and the total number of bags required if each bag is 10 ft long and 1 ft in diameter. Also, specify the maximum pressure drop that will be experienced during the run.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=119Heat power loss from a district heating line with two separate pipes: How big is the loss in W / m? Conditions: Outer pipe diameter of 100 mm, insulation thickness of 50 mm, thermal conductivity of insulation of 0.03 W / mK, ground thermal conductivity of 1.5 W / mK, distance of 1 m between pipe center and ground surface, distance of 0.6 m between pipe center, forward temperature of 80 °C, return temperature of 50°C, and ambient temperature of 5°C.
- A rectangular lot was measured using a 50-m steel tape at 30 oC. If the recorded length and width of the lot are 197.56m and 105.63m respectively. Determine the Error in the area, if the coefficient of thermal expansion is 0.0000116/ oC and standard temperature of the tape is 25 oC.1 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 >A 100 mm concrete wall is to be used to make a cold storage. The floor and ceiling is to use the same material. The room is supposed to have height of 5 m, length of 7 m and a width of 6 m. The ambient temperature is 36 degrees and the room has to be cooled at 3 degrees. The cold storage is to be used to cool 1600 kg of milk. Conduct the cooling load calculation for the room and determine the cooling capacity of the cooling equipment required for this room. Subject- Civil Engineering Only correct answer