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- If the cooling tower range and approach are 10 and 15 degrees centigrade respectively, find the cooling tower effectiveness.21. A tank contains 80ft of air at a pressure of 350 psi. If the air is 200psi and 70degF cooled until its pressure and temperature decrease to respectively, what is the decrease in internal energy?An auditorium of 150 seating capacity is conditioned for the given specifications. Succasshy snd Outdoor conditions .32°C and 65% R.H Required air inlet conditions.... .24°C and 55 % R.H. The quantity of air supplied .0.5 m /min/person. The required condition is achieved first by cooling and dehumidifying and then by heating. Find the following: a) the capacity of the cooling coil in tons of refrigeration b) the capacity of heating coil in kW. c) By-pass factor of the heating coil if the surface temperature of the coil is 22°C.
- Problems 1. An iron casting of mass 10 kg has an original temperature of 200°C. If the casting loses heat to the value of 715.5 kJ, what is the final temperature? Take C=477J/kgK. Ans:323KPlease provide complete solution and diagram for this problem. A 2m3 air tank has an initial pressure of 200 kpa and 45oC. After 2 kg of air used, thetemperature drops to 35oC. What is the final pressure? A. 156.23 kpa B. 134.78 kpa C. 167.45 kpa D. 105.31 kpa Answer: D1.) A hand pump is used to inflate a bicycle tire to a gauge pressure of 70 psi. a) How much work must be done if each stroke of the pump is an adiabatic process and what is the final temperature of the gas? b) We inflate the tire in two steps: (i) an isobaric compression and (ii) an isochoric increase in temperature. Calculate the work done by gas/"us" and/or heat added/removed during the two steps! Is this a viable alternative to the adiabtic compression Explain! Atmospheric pressure is 1 atm, the air temperature is initially 25° C, and the volume of the air in the tire remains constant. Useful values: A bicycle tire is 26 in diameter and has a cross-sectional area of 2 in² [1 in = 2.54 cm]. 1 lb corresponds to a mass of 0.445 kg. c) For Take-Home only Solve the questions in a) and b) in terms of the initial pressure P₁ = P*, the final volume Vf = V* and the pressure ratio K = Pf/P*!
- The actual specific evaporation of a certain boiler is 10. Factor of evaporation is 1.05. If the heating value of fuel is 30,000 kJ/kg, find the boiler efficiency.A 1 cubic meter of water inside a one kg ahminum container is heated from 20°C to 30°C. Find the heat supplied to the system if CA1 = 0.22 cal / gm Note: Assume that there is no heat loss and temperature of water is always equal to the temperature of ahuminum container. а. 20,002,200 cal b. 10,002,200 cal °C. c. 30,002,200 cal d. 40,002,200 cal5. A gas cylinder of volume 'V' and radius 'r' contains 1.00 mol He at a pressure PHe and 1.00 mol Ar at a pressure of PAr, and both are at a temperature T = 298.0K. At the top of the cylinder is a disc with a radius 'r' that is permeable to He but not Ar. The disc is pushed to the half volume mark. 1. How much work is required for this process to be conducted isothermally and reversibly? 2. How much does AG, AH and AS change for this process? Semi-permeable disc Ar Ar Не Не Volume = V V/2 V/2
- 28. An air bubble rises from the bottom of a well where the temperature is 25°C, to the surface where the temperature is 27°C. Find the percent increase in the volume of the bubble if the depth of the well is 10m. Atmospheric pressure is 101, 528 Pa.Defermine the ihfernal Water at 20psi and foo°F ofProblems 1. A database lists an equation for Û as Û= 1.10+ 0.8107+4.75 × 1047² where Û is in kilojoules per kilogram and 7 is in degrees Celsius. What are (a) the corresponding equation for Cv and (b) the reference temperature for Û? 2. Use the steam tables to calculate the change in internal energy between liquid water at 1000 kPa and 450 K, and steam at 3000 kPa and 800 K. How did you take into account the phase change in the water?