# EXPERIMENT #5.docx - EXPERIMENT No 5 u2013 PSYCHROMETRICS...

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EXPERIMENT No. 5 – PSYCHROMETRICS & RELATIVE HUMIDITY By Helder Melo – 27055137 Zofia Wanczycki - 40019963 Presented to Dr. Haghighat & Ali Khazraei For the course BLDG 365 - VP-X Thursday April 3 rd 2019 Concordia University
OBJECTIVES The objective of this experiment is to calculate the various relative humidity values from different equipment and instruments in order to compare their reliability. The main equipment used to measure the temperature and relative humidity will be a heating and a cooling hygrometer. Other various instruments will be used to compare their performance which includes: a sling psychrometer, an aspirated psychrometer, a digital humidity meter, and a chilled mirror hygrometer. INTRODUCTION In this experiment, a cooling and heating hygrometer will be used in order to measure the relative humidity, the dry bulb temperature, and the wet bulb temperature. Relative humidity is the air moisture compared to how much moisture the air can hold at that specific temperature [1]. For example, if the relative humidity is 70%, that means the air is holding 70% of the water is it able to hold at that specific temperature. There are multiple different ways to calculate the relative humidity but in this experiment, we will be concentrating mainly on a heating and cooling hygrometer. The heating hygrometer will first heat the air and eventually add humidity into the air. While the cooling hygrometer will first humidify the air then cool it. Each hygrometer contains a hair hygrometer, a synthetic fibre sensor, and a capacitive humidity sensor which help determine the experimental relative humidity values. Each of their functions will be discussed further below. Theoretical values of relative humidity can also be found with the psychrometric chart. The psychrometric chart indicates air’s important components including the wet bulb temperature, dry bulb temperature, enthalpy, relative humidity and much more. It is thanks to the psychrometric chart that we are able to compare our experimental values to the theoretical values.
PROCEDURE AND MATERIALS MATERIAL NEEDED Heating Hygrometer Cooling Hygrometer Additional instruments: o Sling psychrometer o Aspirated psychrometer o Digital humidity meter o Chilled mirror hygrometer PROCEDURE 1. Turn on both hygrometer (heater and cooler).