the university of texas at austin fall 2014 caee department, architectural engineering program
DESCRIPTION
The University of Texas at Austin Fall 2014 CAEE Department, Architectural Engineering Program Course : HVAC Design ARE 346P/CE 389H Instructor : Dr. Novoselac, Atila ECJ, 5.422 Office (512) 475-8175 e-mail: [email protected] http://www.ce.utexas.edu/prof/Novoselac - PowerPoint PPT PresentationTRANSCRIPT
The University of Texas at Austin Fall 2014CAEE Department, Architectural Engineering Program
Course: HVAC Design ARE 346P/CE 389H
Instructor: Dr. Novoselac, AtilaECJ, 5.422Office (512) 475-8175 e-mail: [email protected]://www.ce.utexas.edu/prof/Novoselac
Office Hours: Tuesday and Thursday 11:00 – 12:00 p.m.
Objectives
• Introduce course syllabus and establish
ground rules
• Describe class content
• Address any of your concerns
Introduce yourself
• Name?
• Department?
• Your professional interest?
HVAC systems
• Systems that: • Cost very much (residential 10-20% , commercial 20-50% of total cost)
• Uses the most energy• Most strongly influences our comfort• Has great potential to improve/degrade our health
• No longer taught in ME (at UT)
• Very high demand for graduates
Motivation for studying HVAC systems
• Responsible for ~40% of energy consumption
• ~90% of our time is spent indoors
• HVAC systems are a central part of every building
Prerequisites
• Building Environmental SystemsFamiliarity with HVAC
• ThermodynamicsPsychrometrics, phase change, properties
• Fluid MechanicsFlow in pipes and ducts, non-dimensional numbers
Useful but not necessary• Heat Transfer
Conduction, convection, radiation
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
Course Topics
• Background, Introduction and Review 2 wks• Heating and Cooling Loads 1 wk• Psychrometrics and mass transfer 1 wk• Air conditioning and refrigerant cycles 2 wks• Chillers and Boilers 1 wk • Coils and heat exchangers 2 wks• Ducts, air, and water systems 2 wks• Large HVAC Systems 2 wk• HVAC Control 2 wk• Final Project, field trip 1 wk• 15 wks
What am I NOT covering?
• Detail calculation of Cooling/Heating loads• Human comfort/Indoor air quality• Furnaces and boilers• Absorption cycle refrigeration• Energy generation (heat and power, cogeneration)• District heating and cooling (campus or city scale)
This is a skills class
• I expect you to come away from this class and be able to understand everything that you see in an HVAC system or know where to go to learn about it.
• You will be able to size most HVAC components, design smaller and medium size systems and understand larger systems
• Kuehn, T.H.; Ramsey, J.W.; Threlkeld, J.L. 1998. Thermal Environmental Engineering (3rd Edition) Prentice Hall ISBN: 0139172203
• First edition was 1962
• Excellent graduate/undergraduate textbook
• Thorough, fundamental, many examples
• Look forward to your opinion
• Other books are optional
Textbook
• Mid-Term Exam 30%• Project 35%• Homework Assignments 30%• Participation 5%
100%
• Homework is a large part of your grade• ~ Weekly assignments, reducing in intensity by the end of semester• 10% penalty per day for late assignments
• You are allowed to work together, but each student must prepare their own solution
Grading
HWs (30%)
• Four homeworks- Combination of
- book problems- design problems I made
• You can work to together but each student should submit individual assignment • NOT a copy of summons work
• HW deadline is at the end of the day
Project (35%)
• Final Project- Undergraduates - group assignment
- Graduates – individual assignment
• Design HVAC component and systems • Assigned in late October
• Final project will have written (report) and oral (presentation) components
Exam (30%)
• One open-book midterm exam: • November 13 tentative
• 1 or 2 longer problem(s)• Few short answer questions
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
My Issues
• Please don’t come to my office between 8:30 and 9:30 am on Tuesday and Thursday• Class preparation
• Please don’t use e-mail to ask me “content” questions• Call me or come see me
• Suggestion are welcome
Course Website
• All class information online
• http://www.ce.utexas.edu/prof/Novoselac/classes/ARE389H/
• PLEASE LET ME KNOW ABOUT ERRORS
TENTATIVE COURSE SCHEDULE
Your questions ?
The Big Picture
• HVAC systems need to provide conditioned and acceptable air quality in buildings• Heating, Cooling, Ventilation
• Heating, cooling, ventilation loads
Systems: Heating
• Make heat (furnace, boiler, solar, etc.)
• Distribute heat within building (pipes, ducts, fans, pumps)
• Exchange heat with air (coils, strip heat, radiators, convectors, diffusers)
• Controls (thermostat, valves, dampers)
Systems: Cooling
• Absorb heat from building (evaporator or chilled water coil)
• Reject heat to outside (condenser)• Refrigeration cycle components (expansion valve,
compressor, concentrator, absorber, refrigerant)• Distribute cooling within building (pipes, ducts, fans,
pumps)• Exchange cooling with air (coils, radiant panels,
convectors, diffusers)• Controls (thermostat, valves, dampers, reheat)
Systems: Ventilation
• Fresh air intake (dampers, economizer, heat exchangers, primary treatment)
• Air exhaust (dampers, heat exchangers)• Distribute fresh air within building (ducts,
fans)• Air treatment (filters, etc.)• Controls (thermostat, CO2 and other
occupancy sensors, humidistats, valves, dampers)
Systems: Other
• Auxiliary systems (i.e. venting of combustion gasses)
• Condensate drainage/return
• Dehumidification (desiccant, cooling coil)
• Humidification (steam, ultrasonic humidifier)
• Energy management systems
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 fluid 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