rac_lect1-1
DESCRIPTION
RAC Lecture - 2TRANSCRIPT
Refrigeration and Air Conditioning (ME 439)
Instructor Dr. Muhammad Asif
GA Engr. Tariq
Faculty of Mechanical Engineering
Introduction of Instructor Education B.Sc in Mechanical Engineering (UET LHR. 2002-2006)
M.Sc in Mechancal Engineering (Hanyang Uni. Korea 2008-2010)
PhD in Mechancal Engineering (Hanyang Uni. Korea 2012-2015)
Work Experience -Project Engineer (Packages Ltd, BSPM Project)
- Lecturer ( HITEC University)
- Lecturer (IIU Islamabad)
Research Experience - Process design, modeling and simulation
- IGCC (integrated gasification combine cycle)
- Coal gasification
- CO2 capture
Books: Text books 1. Heating, ventilation and air-conditioning: analysis and
design, 6th edition by McQuiston, Parker and Spitler. 6th
Edition, John Wiley & Sons, Inc. B1
2. Refrigeration and air-conditioning, W.F Stoecker, J.W
Jones. 2nd edition, McGraw Hill. B2
3. Additional class notes ( power point presentation)
Reference book
HVAC systems design handbook, 4th edition, Roger W.
Haines, C. Lewis Wilson, Mc Graw-Hill
Course Contents Refrigeration ( Ch. 15 of B1+Ch 10 of B2) • Fundamentals of refrigeration • Design of air and vapor compression cycles • Absorption cycle • Components of refrigeration and their types Review of thermodynamic fundamentals with reference to RAC: ( Class notes) • Basic thermodynamic fundamentals and principles Air conditioning: (Ch. 2 of B1+ Ch 5 of B2) • introduction, parts, complete AC system, types, and components Moist air properties and conditioning processes: (Ch. 3 of B1+ Ch. 3 of B2) • Moist air properties, and fundamental parameters, • Psychometric chart
Course Contents Comfort and Health: (Ch. 4 of B1+ Ch 3 of B2) • Physiological considerations, environmental indices, comfort conditions, IAQ concerns, contaminants, controlling contaminants Heat transmission in building structures: (Ch 5 of B1+ class notes) • Modes of heat transfer, heat transfer coefficients for walls, roofs, windows, doors, floor slabs, pipes (horizontal, buried), and moisture transmission. Space heat load analysis (Ch. 6 of B1+ Ch4 of B2) • Outdoor and indoor design conditions, transmission heat losses, infiltration, crack method, air-change method, draft coefficient, calculation aids, heat losses in air ducts
Cooling load analysis: (Ch. 8 of B1+Ch. 4 of B2) • balance and terminologies, design conditions, heat balance method, formulation, modes of radiation, transparent surfaces, zone air heat balance, radiant time series method, application of methods, supply air quality Fluid flow, pumps, and piping design: (Ch. 10 of B1+ class notes) • fluid flow basics and terminologies, flow measurement, centrifugal pumps, combined system and pump characteristics, variable pump speed, piping design system, closed and open-loop systems, pipe sizing, air elimination, large system design, steam heating systems Fans and building air duct design: (Ch. 12 of B1+ Ch 6 of B2) • Fans and their performance, fan laws, fan types and selection, installation of fans, restrictions, field performance testing, variable-air-volume systems, flow through ducts and fitting, duct systems, duct design
Evaluation Methods Quizzes 15% Assignment Sessions 10% Mini Project 5% Midterm Exam 25% Final Exams 45%
Quizzes & Assignment Sessions
Total 7 Quizzes & 7 Assignment Sessions. But for grading 5 best
quizzes and 5 best assignments will be consider
One mini-project
No surprise quiz
Both quiz & assignment session will be conducted in one sitting
No retake / make-up for missed quizzes / assignments
According to institute policy, 80% attendance is mandatory
Course Objectives
Application of thermodynamic and heat transfer to
refrigeration and air-conditioning
Solving problems; designing of refrigeration, HVAC systems,
pipes and ducts.
Students will gain the knowledge about types of refrigeration
and HVAC system, design, operation, and their impact on the
environment.
Week-1
Introduction to the course(overview)
Fundamentals of RAC and its application,
Review of thermodynamic fundamentals and principles
What is Refrigeration
Refrigeration is the process of producing and maintaining
lower temperature within a confined space, lower than the
temperature of the surrounding, up to target temperature.
Refrigeration means continuous extraction of heat from a
body whose temperature is already below the temperature
of the surrounding.
Units of Refrigeration Ton of Refrigeration (TR)
Heat extraction capacity of refrigeration and air conditioning
equipment.
The rate of heat removal required to freeze a metric ton (
1000 kg) of water at 0 ℃ in 24 hours.
Why RAC is important
• It has application from domestic to commercial units.
• Cold storage (Food, Beverage, Medicines)
• Processing and Preservation of food
• Refrigeration systems in Submarines, ships, air crafts,
Space-craft
• Water Coolers
Ammonia based refrigeration plant for a large cold storage according To ASHRAE American Society of Heating, Refrigerating, and Air-Conditioning Engineers