4.2. The ball catathermometer factor (F) is 620, time while the spirit column drops from 38 to 35°C in 100 seconds and the air temperature is 26°C. Determine the air movement speed for the industrial section with these parameters.
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- Q5/ The following data are given for the space to be air conditioned: Outside design conditions = 43C db, 27C wb Inside design conditions = 25C db, 50% RH Room sensible heat load = 40 kW Room latent heat load = 10 kW By pass factor of cooling coil = 0.2 The return air from the room is mixed with the outside air before entry the cooling coil in the ratio of 3 : 1 by mass. Determine: 1. Supply air flow rate 2. Outside air sensible heat 3. Outside air latent heat 4. Grand total heat 5. Effective room sensible heat factorAssuming the clearance is negligible for a single stage compressor with the following data.Atmospheric pressure: 90 kPaAtmospheric temperature: 17 ˚CDelivery pressure: 7 barFree air delivery flow rate: 0.2 m3/minTake “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K 1.What is the power input to the compressor in kW to 2 decimal places if the compression is polytropic compression process with n=1.25?Assuming the clearance is negligible for a single stage compressor with the following data.Atmospheric pressure: 90 kPaAtmospheric temperature: 17 ˚CDelivery pressure: 7 barFree air delivery flow rate: 0.2 m3/minTake “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K 1.What is the power input to the compressor in kW to 3 decimal places if the compression reversible isothermal?
- Write the components of Sub-Sonic Wind Tunnel?2.5-L bench scale bioreactor is used for the production of recombinant P64K protein from Neisseria meningitides. The dimensions for the bioreactor are Dt 12.9 cm, ratio Di/Dt = 1/3 and N = 700 rpm. With the scale up factor of 2.24, determine the impeller tip speed (m/s) for the pilot scale bioreactor based on constant impeller tip speed and constant power consumption per volume. Predict which scale up method might give a higher concentration of P64K, if the demand of dissolved oxygen plays an important role.B) The air flow to a four cylinder four-stroke engine is 2.15 m³/min. During a test on the engine the following data were recorded: Bore 10.5cm; stroke 12.5cm; engine speed 1200 rpm, torque 150 N.m, fuel consumption 5.5 kg/hr, calorific value of fuel, 43124 kJ/kg, ambient temperature 1-The brake thermal efficiency. and pressure are 20°C and 1.03 barş. Calculate: 2-The brakes mean effective pressure. 3-The volumetric efficiency.
- Q2/ In one of applications, wanted to condition laboratory at inside design condition DBT=24 °C and 50% Rh and outside design condition DBT=44 °C and WBT=27 °C. Total sensible load for the space is 35 kW and total latent load for the space is 19 kW. Rate of supplied air to the space is 11050 m /hr and rate of outside ventilation air is 4250 m/hr. The recirculated air is mixing with the outside air and then entering to cooling coil and leaving at 95% Rh then the air is passing through heating coil before supply to the space. Determine: 1.Condition of supply air to the conditioned space (DBT & RH); 2.Condition of air before and after cooling coil (DBT & RH); 3. Sensible load of heating coil; 4.Sensible load and latent load and total load of cooling coil; 5. Apparatus dew point (ADP) for the cooling coil; 6. Draw the cycle on the psychrometric chart.1. A single acting reciprocating air compressor has a clearance volume of 8%. Air is received at 100kpaa and 30°c and discharged at 600kpaa. The compression and expansion are polytropic with n=1.28. The pressure drop at suction port is 5kpa and at discharge port is 10kpa. The volumetric is 0.48m/min when operating at 900rpm. Determine a) The cylinder dimension if L/D=1.15. b) The mass of air drawn in kg/hr. c) The compressor power.If air flows in a 20 mm diameter constant area duct at a velocity of 125 m/s with a static temperature of 300 K and a static pressure of 300 kPa, find the rate of heat input required to choke the flow. [Ans. 50.25 kJ/kg]
- A fan manufacturer rates his fans at 152 mm water gage static pressure for 10 m² of air per second at 21°C, 1,200 rpm and static efficiency of 69%. At what speed, in RPM, would these fans operate to develop 130 mm water gage when the temperature is 316°C?a. What is the Static efficiency of the fan if the air flow rate is equal to 3.8 5m /sec, total head of 68.72 m, velocity head of 30.86 m, mechanical efficiency and power are 39.12% and 35.72 KW at 30.69°C, respectively. b. Solve for the area at entrance of the fan blade, if the it has a 346mm diameter, flow of air is equal to 23.328 m/se and flow rate of 3.05 m³ /second.3. Assume the turbine as an incompressible flow machine. The average meridional speed is given as 150m/s. The flow coefficient is 0.5. Determine the blade speed that satisfies the above conditions.4. In a two-dimensional compressor cascade, inlet stagnation air pressure is 1.5 bar and inlet stagnation temperature is 330K. For an inlet Mach number of 0.75 and an inlet flow angle of 500, the exit flow angle is measured as 15.80. Determine the mass flow rate per unit frontal area, the exit Mach number and the static pressure ratio across the cascade. Assume the flow is isentropic.