Learning Psychrometrics and Sensors measuring T and RH

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Presentation transcript:

Learning Psychrometrics and Sensors measuring T and RH 方煒台大生機系教授 Wei Fang, Ph.D., Professor Dept. of Bio-Industrial Mechatronics Engineering, National Taiwan University

Analog Dry Bulb Temperature sensor

Analog Dry and Wet Bulb Temperature

Digital Dry Bulb Temperature reader

Infra-red Dry Bulb Temperature

Thermal Imager http://us.fluke.com/usen/products/CategoryTI/ http://www.landinst.com/infrared/products/thermal_imaging/tp8_portable_imager.htm http://us.fluke.com/usen/products/CategoryTI/ http://www.landinst.com/infrared/products/thermal_imaging/guide_M4_thermal_imager.htm

Sensing element

Dry and wet Bulb Temperature sensors in Weather station and greenhouse

RH = f(Tdb, Twb) Patm = 101.325 kPa

Tdb and RH Sensors

Tdb and RH data logger

Day/Night trends of T and RH

High T coexist with Low Hum. 午夜中午溫度濕度

High humid Env. Low T, High RH High T, Low RH

Forced ventilation

Evaporative cooling Fogging

Evaporative cooling Pad and Fan system

Approach to release thermal stress

Beware of the side effect. Approach to release thermal stress Beware of the side effect.

Psychrometric Chart

Process: from one state to another

Human comfort zone

Animal comfort zone – T only Productivity Dry bulb temperature

Impact of T and RH on milk production of cows 82.49 64.65 63.39 68.47 72.32 76.68 64.31 65.05 75.73 79.96 63.7 87.09 90.09 88.06 86.01 82.09 84.21 82.36 THI>85, no recovery Adapted from ASHRAE Fundamentals, 1999

Reduction of milk vs. Temperature-Humidity Index (THI) Adapted from ASHRAE Fundamentals, 1999

Milk Production=f(HD74, HA80S) MP = 21.48 – 0.051 * HD74 – 0.0099 * HA80S Where, MP: Milk production (in kg/day/cow) 21.48: daily production (in kg) per cow in normal weather condition HD74: total hrs of THI > 74 for previous 4 days HA80S: square of total hrs of THI > 80 for previous day Linvill and Pardue (1992)

THI lines on Psychrometric chart

More about Psychrometric chart Following contents, created by the author, are available from DSpace at UVM. Tutorial for digital psy chart Digital psychrometric chart software

The End