ARE377K/ARE389H/CE389H HVAC Design Dr. Siegel Objectives Demonstrate knowledge of syllabus and ground rules Describe class content Address any of your concerns

Motivation Who are you? Grad/undergrad? Department? Why are you here?

HVAC systems The part of our buildings that Costs the most money Uses the most energy Most strongly influences our comfort Has great potential to improve/degrade our health No longer taught in ME Very high demand for graduates Amazing microenvironment

Buildings Responsible for ~35% of energy consumption ~90% of our time is spent indoors Construction is one of the largest industries in the world HVAC systems are a central part of every building

The University of Texas at Austin Fall 2005 Dept. of Civil Engineering Architectural Engineering Program Course: HVAC Design (ARE 377K/CE 389H/ARE 389H) Prerequisites: Any three of ARE 346N, CE 319F, ME 320/326, ME 339 or consent of instructor Professor: Dr. Jeffrey Siegel ECJ, Rm , PRC-CEER ; LAB ; FAX Office Hours: Tuesday 3:30 -5:00 p.m., Thursday 12 – 1:00 p.m. Website:

Prerequisites (any 3) Building Environmental Systems Familiarity with HVAC Thermodynamics Psychrometrics, phase change, properties Heat Transfer Conduction, convection, radiation Fluid Mechanics Flow in pipes and ducts, non-dimensional numbers

My Quirks Please don’t come to my office between 1 and 2 pm on Tuesday and Thursday Class preparation and teaching time Please don’t use to ask me “content” questions Call me or come see me I care about your learning I listen to your comments The more specific the better

What have you heard about this class? Too hard (18 of 23 students) Covering less material in more depth Want more applied material (10 of 23 students) Applied problem solving classes Take home exams (3 over course of semester) Final project configured to be easier Take home exam was too hard (22 of 23 students) Will make them easier

1.Apply fundamental physical principles to HVAC design 2.Describe and size each component in an HVAC system 3.Design HVAC systems based on manufacturer’s datasheets 4.Contrast residential systems with commercial systems and use appropriate design techniques for each type of system 5.Solve HVAC design problems with high-quality references Course Objectives By taking this class you will be able to..

This is a skills class I expect you to come away from this class and be able to understand everything that you see in HVAC system or know where to go to learn about it. You will be able to size most HVAC components and design smaller systems

Kuehn, T.H.; Ramsey, J.W.; Threlkeld, J.L Thermal Environmental Engineering (3rd Edition) Prentice Hall ISBN: NOTE VERSION ISSUE: Reprinted with corrections, 2001 First edition was 1962 Excellent graduate textbook Thorough, fundamental, many examples Look forward to your opinion (16 of 23 liked it in 2004) Other books are optional Textbook

Midterm (take home)25% Projects25% Homework Assignments45% Participation5% 100% Homework is a large part of your grade ~ Weekly assignments, tapering off by end of semester 10% penalty per day for late assignments You are allowed to work together, but each student must prepare their own solution Copying is expressly forbidden by UT policy Grading

Other Notes About Grading Last year 19 A, 3 B, 1 C Class is hard, but I reward effort If you do a good job on all assignments, exams, and projects, you will get an A I have no problem giving As to everyone in the class. (I also have no problem giving Cs to everyone in the class)

Take Home Exams You will have a weekend to do each exam (except for last one You must work alone Open book/open notes Expect them to be challenging 25% of final grade

Participation My assessment of your participation in the class 5% of total grade How to get participation points Come to class and be on time Submit all assignments/project on time Participate in class

Project- Component Based Learning You will have some choice in topic area Project assigned 9/20 Write-up due 12/8 Presentation 12/6 25% of final grade

DateTopicAssigned Reading 9/1- 9/13 Course introduction and reviewChapters 2, 7 9/15- 9/20 Psychrometrics (Project assigned 9/20)8 9/22 Moist air / water mass transfer Cooling towers and evaporative coolers 10 9/27-9/29 Thermodynamic cycles Air conditioners and heat pumps 3 10/4 Refrigerants, compressors, and expansion valves 4 10/6 Problem Solving Session 1 (Take Home Test 1) 10/11-10/20 Heat Exchangers and Coils11 10/25-11/3 Air systems Ducts and duct design, fans 18 11/8 Hydronic (water) systems and pumps19 11/10 Problem Solving Session 2 (Take Home Test 2) 11/15,11/17 HVAC controlshandout 11/22 Residential HVAC systems 11/29 Problem Solving Session 3 (Take Home Test 3) 12/1-12/8 Overflow, Field Trips, Project presentations

What am I not covering? Furnaces/boilers Human comfort/ indoor air quality Absorption cycle refrigeration Cryogenics Energy generation Heating and cooling loads

Class Website Date is in filename (i.e. 389H_090105) Use PDFs and PPTs – can cut and paste text, follow links PLEASE LET ME KNOW ABOUT ERRORS

Missed Classes Very unfortunate, but I need to miss next two classes (9/6 and 9/8) Indoor Air 2005 in Beijing (Every three years, most important conference in my field)Indoor Air 2005 Authored 4 papers, 2 Forums, Chairing 1 session Numerous meetings Video-recorded 2 lectures On class website Dr. Novoselac has agreed to answer any questions

Any Questions ?

Why HVAC? Heating, cooling, ventilation (of buildings) Energy and mass transfer between inside and outside Energy and mass transfer within buildings

Cooling coil Heat transfer from air to refrigerant Extended surface coil Drain Pain Removes moisture condensed from air stream Condenser Expansion valve Controls Compressor

Heating coil Heat transfer from refrigerant to air Heat pump Furnace Boiler Electric resistance Controls

Blower Overcome pressure drop of system Adds heat to air stream Makes noise Potential hazard Performs differently at different conditions (air flow and pressure drop)

Duct system (piping for hydronic systems) Distribute conditioned air Remove air from space Provides ventilation Makes noise Affects comfort Affects indoor air quality

Diffusers Distribute conditioned air within room Provides ventilation Makes noise Affects comfort Affects indoor air quality

Dampers Change airflow amounts Controls outside air fraction Affects building security

Filter Removes pollutants Protects equipment Imposes substantial pressure drop Requires Maintenance

Controls Makes everything work Temperature Pressure (drop) Air velocity Volumetric flow Relative humidity Enthalpy Electrical Current Electrical cost Fault detection

Goals of this class Use thermodynamics, fluid mechanics, heat transfer, control theory, physics, critical analysis to design HVAC systems that work

DateTopicAssigned Reading 9/1- 9/13 Course introduction and reviewChapters 2, 7 9/15- 9/20 Psychrometrics (Project assigned 9/20)8 9/22 Moist air / water mass transfer Cooling towers and evaporative coolers 10 9/27-9/29 Thermodynamic cycles Air conditioners and heat pumps 3 10/4 Refrigerants, compressors, and expansion valves 4 10/6 Problem Solving Session 1 (Take Home Test 1) 10/11-10/20 Heat Exchangers and Coils11 10/25-11/3 Air systems Ducts and duct design, fans 18 11/8 Hydronic (water) systems and pumps19 11/10 Problem Solving Session 2 (Take Home Test 2) 11/15,11/17 HVAC controlshandout 11/22 Residential HVAC systems 11/29 Problem Solving Session 3 (Take Home Test 3) 12/1-12/8 Overflow, Field Trips, Project presentations

Important Dates No classes on Thursday 24 November due to Thanksgiving holiday. Take Home Tests Assigned 10/6 due 10/11 Assigned 11/10 due 11/15 Assigned 11/29 due 12/1 Project assigned Tuesday 20 September Oral Presentations 12/6, Written Report due 12/8 No final exam, no oral exam