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.

Slides:



Advertisements
Similar presentations
Tutorial for Psyc0226 Wei Fang, Ph.D., Professor
Advertisements

Comparing the Humidity and Dew Point of two different locations
MATLAB based design software for greenhouse evaporative cooling system
Ta-Te Lin, Yi-Chung Chang
How to Determine Dew Point and Relative Humidity
Psychrometry HVAC CNST 305 Environmental Systems 1 Dr. Berryman 5cIndoor Air Quality, Psychometrics; Dry and Wet Bulb; Enthalpy; Condensation; Dew Point.
Atmospheric Moisture. How does the moisture get in the atmosphere?? EVAPORATION TRANSPIRATION – water evaporated from trees.
After completing this Lesson, you will be able to answer: 1. What is humidity? 2. What is relative humidity? 3. How relative humidity is measured? 4. What.
How do we measure relative humidity?
10/28/97A F Emery1 PSYCHROMETRICS and ELEMENTARY PROCESSES (SI Units) Ashley F. Emery University of Washington.
Examples on using Psychart -- The digital psychrometric software
ARCH-432 Dew Point Saturation and Psychometrics. Attendance Who is typically referred to as the “Father of Cool”? (hint: generally credited with developing.
Air temperatureRelative humidityAir movement Surface temperatures Air quality (IAQ) Lighting quality quantity Acoustics Security Building Envelop -The.
PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART INTRODUCTION:
Climate Most important environmental factor and the first one that should be considered Can dictate what passive design strategies will be suitable and.
1 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – August 2010eere.energy.gov Comfort and Climate WEATHERIZATION ENERGY AUDITOR SINGLE FAMILY.
Environmental Controls I/IG Lecture 6 Thermal Comfort.
BEM class 3 Climate & Human Comfort. Class (lecture) objectives Appreciation of the indoor and outdoor environments and how they relate to our energy.
Psychrometry HVAC CNST 305 Environmental Systems 1 Dr. Berryman 5cIndoor Air Quality, Psychometrics; Dry and Wet Bulb; Enthalpy; Condensation; Dew Point.
Unit 4 Weather ©Mark Place,
Learning Solar Engineering fundamentals and light measurement 方煒 台大生機系教授 Wei Fang, Ph.D., Professor Dept. of Bio-Industrial Mechatronics Engineering National.
1 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – December 2012eere.energy.gov Moisture Assessment WEATHERIZATION ENERGY AUDITOR SINGLE FAMILY.
3. Cooling a. Introduction 1) Definition reduce temperature of air entering greenhouse Why? –Reduce stress –Uniformity –Better growth.
Learning Psychrometrics and Sensors measuring T and RH
New York City Climate Analysis Weather Data Summary.
Boker Wright, Dan Lewis, Tina Foley and Brandon Wissel.
1 Dr. C. L. Jones Biosystems and Ag. Engineering Psychrometrics – Lecture 2.
Heat Stress Lessons Learned and Reducing the Impact 134 Call Hall Manhattan, KS Dr. Micheal Brouk OABP Spring Meeting.
Alternative evaporative cooling and naturally ventilated double roof system for environmental controlled dairy barn located in tropical and subtropical.
Objectives Define psychrometric quantities Continuation from previous class Draw psychrometric processes Relate psychometric variables to human comfort.
Saturation = filled to capacity
What is Fog? Fog is essentially a dense cloud of water droplets, or cloud, that is close to the ground. Fog forms when warm, moist air travels over a cold.
L. De Wet.  Compare Durban and Bloemfontein weather  Indices quantify effects of environment on human beings  T or solar radiation = absolute measure.
Class Objectives Stress the importance of HVAC
Tutorial for MATLAB based V.E.T.H. Wei Fang, Ph.D., Professor Dept. of Bio-Industrial Mechatronics Engineering National Taiwan University Last updated:
1. Explain the characteristics of each weather element; 2. Know the instruments used for measuring the weather elements; 3. Describe measuring of weather.
Washington DC Climate Analysis Weather Data Summary.
HUMIDITY AND DEW POINT. CONDENSATION � H2O can exist in solid, liquid, or gaseous states. Change from liquid to gas is evaporation. Change from gas to.
Choice of Design Conditions 2 December 2015choise of design condition1.
PSYCHROMETRY AND HVAC Psychrometry (hygrometry): science of moist air
Calculating Relative Humidity Practice Use table from MJ 2006 Paper 1 Q4.
Philadelphia Climate Analysis Weather Data Summary.
Psychrometry Study of air-water mixtures.
How to read a Psychrometric Chart
Engineering Fundamentals：part I Related to moist air and water
Objectives Ventilation analysis with HOP Human exposure/IAQ Ventilation and energy.
PICNIC Demo Module 1 IP-based Psychrometer 陳育瑋、方煒 台大生機系.
Moisture in the Atmosphere Beaker demo. Humidity Humidity - how much moisture is in the air. Saturated air is air that is full of water. Dew point is.
Objectives Psychometrics Psychometrics of AHU.
Dew Point The temperature that the air needs to be cooled to reach saturation (100% humidity) Cooling the air below the dew point causes the water vapor.
1 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – August 2010eere.energy.gov Moisture Assessment WEATHERIZATION ENERGY AUDITOR SINGLE FAMILY.
Lecture Objectives: Review Psychrometrics Introduce Air Handling Unit
PASSIVE DESIGN Sammar Allam PhD. Candidate Faculty of Engineering, Architecture Dept. Alexandria University Egypt 21 Nov
Doug Jefferson, Business Development Engineer
Introduction to Food Engineering
資料擷取與感測器 應用實務.
Unit 4 Weather ©Mark Place,
PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART INTRODUCTION:  PSYCHOMETRICS IS THE STUDY OF MOIST AIR.  THE PSYCHOMETRIC CHART IS A GRAPHIC REPRESENTATION.
PSYCHROMETRY AND HVAC Psychrometry (hygrometry): science of moist air HVAC: Heating, ventilating, and air-conditioning I am teaching Engineering Thermodynamics.
BAE4400 Topics in Processing
Environmental Controls
Lecture Objectives: Review Psychrometrics Introduce Air Handling Unit
Psychrometrics – Lecture 2
Impact of climate change on animal production
Topics in Processing Dr. C. L. Jones Biosystems and Ag. Engineering.
Weather ©Mark Place,
BAE4400 Topics in Processing
Lecture Objectives Learn about Psychrometric Chart Quantities
Environmental Controls I/IG
Environmental Controls
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

Sensing element

Dry and wet Bulb Temperature sensors in Weather station and greenhouse

T db and RH Sensors

T db and RH data logger

Day/Night trends of T and RH

High T coexist with Low Hum. 午夜 中午 午夜 溫度 濕度

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

Forced ventilation

Evaporative cooling Fogging

Evaporative cooling Pad and Fan system

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 Dry bulb temperature Productivity

Impact of T and RH on milk production of cows THI>85, no recovery Adapted from ASHRAE Fundamentals,

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

Milk Production=f(HD74, HA80S) MP = – * HD74 – * 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

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.