Lab1 Essay

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Lab 1b Cooling Tower Performance and Sensors for Thermal-Fluid Systems OBJECTIVES Warning: though the experiment has educational objectives (to learn about boiling heat transfer, etc.), these should not be included in your report. To become familiar with the P.A. Hilton H891 Bench Top Cooling Tower and its operating principles. Check the accuracy of the temperature sensors (thermocouples) in the cooling tower. To measure wet and dry bulb temperatures, apply psychrometric principles to determine relative humidity, and measure humidity. EQUIPMENT Name Bench Top Cooling Tower Thermistor (lab standard) Power Supply LabView Data Acquisition VI Model P.A. Hilton H891 Omega CL-351A Agilent E3620A S/N The Bench Top Water Cooling Tower has been designed to give students an appreciation of the construction, design and operational characteristics of a modern evaporative cooling system. The unit is also an excellent example of an 'open system' through which two streams of fluid flow (water and air) and in which there is a mass transfer from one stream to the other. Convincing energy and mass balances are obtained and students can quickly investigate the effects of air flow rate, water flow rate, water temperature and cooling loads on the performance of a cooling tower. You will measure the performance of the cooling tower, and determine the errors of your sensors and uncertainties of your measurements. Figure 1: Bench Top Water Cooling Tower PRE-LAB QUESTIONS 1- What is difference between dry bulb temperature and wet bulb temperature? 2- What is the cooling rate? 3- Describe with examples the difference between an open system and a closed system? 4- What is a psychrometric chart? 5- What is the effect of cooling loads on the performance of a cooling tower? COOLING TOWER TERMS Cooling range: The difference between the water temperature at entry to and from the tower.

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