Exp 1 Cooling Tower (1).docx

2 exp1jan2018 separation process cpb 21404 experiment

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Separation Process CPB 21404 Experiment A Investigation of the effect of air velocity on wet bulb approach and pressure drop through the packing Objectives: To investigate the effect of air velocity on: a. wet bulb approach b. pressure drop through the packing Procedures : 1. Prepare and start the cooling tower with according to general start-up procedures. 2. Set the system under the following conditions and allow stabilizing for about 15 minutes. Water flow rate : 2.0 LPM Air flow rate : Maximum Cooling load : 1.0 kW Column Installed : Column A (110 m 2 / m 3 ) Dimension of Column : 15 cm (w) x 15 cm (d) x 60 cm (h) 3. After the system stabilizes, record a few sets of measurements and then obtain the mean value for calculation and analysis. Temperature (T1-T6) Orifice differential pressure (DP1) Water flow rate (FT1) Heater power (Q1) Pressure drop across packing (DP2) 4. Repeat the test with three different sets of orifice pressure drop values (75%, 50% and 25% of the maximum value) without changing the water flow rate and cooling loads. 5. Finally, measure the cross sectional area of the column. RESULTS AND DISCUSSION: Discuss all your results. The questions below only serve as a guideline. Your discussion should not only limited to these questions. 1. Calculate the nominal velocity of air and find the “wet bulb approach”. 2. Plot a graph to show that the relationship between “wet bulb approach” and packing pressure drops versus nominal air velocity in the same graph. 3. Discuss the effect of nominal air velocity on the approach to wet bulb and pressure drop through packing. 4. Discuss the relationship between the approach to wet bulb and pressure drop through packing. 3 Exp1/Jan2018
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Separation Process CPB 21404 Table of Results: Table A Description unit Air F low 100% 75% 50% 25% Packing density m -1 110 110 110 110 Air inlet dry bulb, T1 C Air inlet wet bulb, T2 C Air outlet dry bulb, T3 C Air outlet wet bulb, T4 C Water inlet temperature, T5 C Water outlet temperature, T6 C Orifice differential, DP1 Pa Water flow rate, FT1 LPM Heater power, Q1 Watt Pressure drop across packing, DP2 Pa Table B Description Air Flow 100% 75% 50% 25% Nominal velocity of air (m/ s) Approach to web bulb (K) Pressure (mm H 2 O) 4 Exp1/Jan2018
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Separation Process CPB 21404 Useful Information : In order to plot the graph, it is necessary to follow the steps of calculation. 1. Calculate approach to wet bulb. Approach to wet bulb = Outlet water temperature (T6) – Inlet air wet bulb temperature (T2) 2. Check the value of specific volume of air at outlet in the humidity chart (plotting air outlet dry buld and air outlet wet bulb on psychometric chart) 3. Calculate the air mass flowrate, o m (kg/ s) o m 0.0137 h h : orifice differential in mm H 2 O : specific volume of air (m 3
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