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Heating Ventilating and Air Conditioning: Analysis and Design
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- Pls solve the question in the imagearrow_forwardA small-scale Compressed Air Energy Storage (CAES) system uses a rigid tank, whichhas been sized to 1m3. The air storage helps support various fluid power (pneumatics)requirements, but also serves for energy storage (when fully charged).The tank sits in a plant room having a temperature of 25oC at 1 atmosphere (101.325kPa).When delivered new and installed the tank (and the ambient air it contains) is assumedinitially at the same steady state conditions in the plant room. The tank can be filled with(dry) air to a maximum pressure of 300bar. When left in the plant room, the pressurised airtank eventually attains the plant room temperature.You may assume:> Steady state conditions apply> Negligible changes in kinetic and potential energy> Thermal mass of the tank (metal) is negligible Apply the ideal gas equation and calculate the mass of 25oC air (units: kg) in the fullypressurised tank.arrow_forwardAn auditorium scats 1,500 persons. The inside design condition is 26°C dry bulb and 17°C we bulb temperatures. The outside dry bulb temperature is 35°C and the relative humidity is 50% The heat gain rate due to walls; roof, windows, etc. is 35 kW. The light power is 15 kW and the (CLF)L, is 0.82. Calculate the followings: (a) Mass flow rate of ventilation air required. (b) Cooling load due to ventilation air. (c) Total heating load due to occupants for evening show, assuning (CLF)oce. = 0.76. (d) Relative humidity inside the auditorium. (e) Maximum relative humidity allowed for comfort if the inside dry bulb temperature is to be maintained at 26°C. (f) Sensible heat ratio of the auditorium.arrow_forward
- The moisture removed from a material is 200 lb/hr and change of humidity ratio of air in the dryer is 105 grains/lbmd.a. Determine the fan capacity in cfm if specific volume of air entering is 38 ft3 /lb.arrow_forwardA stirred-tank blending process is operating with w13500 kg/min, w2 = 200 kg/min, x1 = 0.4 and x2 = 0.75. The liquid volume and liquid density are constant, 2 m3 and 900 kg/m3, respectively. At t=0 x1 is adjusted from 0.4 to 0.6 and w2 from 200 kg/min to 100 kg/min. Plot the weight fraction (x) or concentration against time What is the concentration at t= 1 minute? Control valve Mixture of A and B Pure A Ovarflow linearrow_forwardCalculate the daily evaporation rate (in mm/ day) from an open surface, if the net radiation is 220 W/m^2, relative humidity of 42%, water surface temperature is 32 degrees Celsius and the air temperature is 25 degrees Celsius. Assume no other sensible heats or ground heat flux. Use Energy-Budget Method.arrow_forward
- ANSWER IN DETAILED SOLUTIONarrow_forwardBenzene at 20 0C is pumped from one storage tank to a reactor (density=878 kg/ m3 ). Volumetric flow rate of benzene is 9.5x 10-4 m3 /s. The difference in the elevations of the two unit is 40m. The tank whichserves as a source is open to the atmosphere while the tank which receives the benzene has a pressure of P2 kPa abs in the vapor space above the benzene. 1‐in, schedule‐40 steel pipe and 2‐in Sch‐40 steel pipe isused in suction and discharge line respectively. Total friction loss of the system given as 135 J/kg . Pressure gauges in the pipeline at the inlet and outlet of the pump read (P3) 34.5kPa and (P4) 1051.6kPa, respectively. Efficiency of pump is %75 a) Calculate the power of pump (kW). (Fluid Mechanics Question) (Please answer it detailed and step by step)arrow_forwardIt is desired to rehydrate 10 kg of dried mangoes (3% dry basis) to a moisture content of 80% wet basis. How much water must be added and what is the weight of the rehydrated mangoes? (Write "done" in the answer box when done solving") A pump with a shaft input of 45 KW and efficiency of 70% is connected in a waterline carrying 0.10 m3/s and delivers it to the washing plant of a certain canning industry. The pump has 120 mm diameter suction line and a 150 mm diameter discharge pipe. The pressure gage attached to the suction line is located at 200 cm below the centerline of the discharge pressure gage and reads –500 mmHg. The pressure gage attached to the discharged pipe is located 140 cm above the centerline of the pump. Neglecting friction, calculate the discharge pressure in kPa. Mango juice puree with a specific gravity of 1.48 and viscosity of 26.7 cP is flowing in a 35 mm diameter pipe. If the puree flow rate is 1000 L/min, determine the pressure drop due to friction for a 100…arrow_forward
- 8. The foilowing observations were made during the trial of a boiler plant consisting of a battery of 6 lancashire boilers and an economiser: Calorific value of coal per kg= 30MJ/kg; Mass of feed water per kg of dry coal 9.1 kg; Equivalent evaporation from and at 100" C per kg of dry coal = 9.6 kg; Temperature of feed water to economiser 12" C: Temperature of feed water to boiler 105° C; Air temperature 13° C ; Temperature of flue gases entering economiser 370° C; Mass of flue gases entering economiser 18.2 kgkg of coal; Mean specific heat of flue gases = 1.005 kJ/kg K. %3D Find : 1. the cfficiency of the boiler alone; 2. the efficiency of the economiser alone ; and 3. the [Ans. 72.22% ; 54.43%; 84.1%l efficiency of the whole boiler plant.arrow_forwardAn auditorium to be air-conditioned for the following conditions, Outdoor dry-bulb temperature 40 °C Outdoor wet-bulb temperature 20°C Expected comfort condition 20 DBT 60%RH Seating capacity of the auditorium 1500 persons Air supplied from outdoor 0.3 m¥min per person fthe required condition is achieved first by adiabatic humidification and then by cooling, determine () the capacity of the cooling coil in tonnes and (i) the capacity of humidifier in kg/h.arrow_forwardIn an absorption tower, ammonia is absorbed from air at atmospheric pressure by aceticacid. The flowrate of 2 kg/m2s in a test corresponds to a Reynolds number of 5100 andhence a friction factor R/ρu2 of 0.020. At the temperature of absorption the viscosity ofthe gas stream is 0.018 mNs/m2, the density is 1.154 kg/m3 and the diffusion coefficientof ammonia in air is 1.96 × 10−5 m2/s. Determine the mass transfer coefficient throughthe gas film in kg/m2s (kN/m2) Explain briefly .arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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