Air Conditioning

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  • Topic: Dew point, Psychrometrics, Atmospheric thermodynamics
  • Pages : 71 (11124 words )
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  • Published : November 7, 2012
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HVAC Systems: Air Conditioning

Dr. Harjit Singh
Room 116 Howell Building harjit.singh@brunel.ac.uk
Fridays 09.30 – 11.30am Unless otherwise specified

For students enquiries:

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Building Services Engineering: Building Air Conditioning Module (ME5508), Brunel University

Introduction to the module
• Credit: 15 • Teaching materials:
– Provided for the MSc students. – Undergrads: Buy them from the stores.

• Assignment: to be handed two weeks before Xmas, deadline-28 Jan 2013 • Students enquiries: – Fridays 09.30 – 11.30am Unless otherwise specified – Outside these hours: email me for appointment: harjit.singh@brunel.ac.uk • Is the teaching materials enough: yes, but further reading is recommended – Eastop, T. D and Watson. E. (1992). Mechanical Services for Buildings, Longman Scientific and Technical – CIBSE Guide A, Section 1: Environmental criteria for design, CIBSE, 2006 – Jones, W. P. (2003). Air Conditioning Engineering (5th edition), Arnold Publishing.

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Building Services Engineering: Building Air Conditioning Module (ME5508), Brunel University

Module Content • Part 1 - Basic principles of air conditioning system design – Psychrometry – Basic Air Conditioning Processes (heating, cooling, humidification/dehumidification) – Thermal Comfort – Design Conditions – Basic Air Conditioning System Design

• Part 2 – Air Conditioning Systems (Design and Applications) – Air Conditioning System Classification – All-air systems (constant volume and variable volume)

– Air and water systems (induction and fan coil systems – panel type systems) – All water systems (non ventilation fan coils and heat pumps) 3

Building Services Engineering: Building Air Conditioning Module (ME5508), Brunel University

Basic Requirements

• For revising the basics (Chapter 1 ‘Building Air Conditioning’ book) – – – – – Thermodynamic properties and how to obtain them from tables and diagrams Open and closed systems First law of thermodynamics (SFEE equation). Equation of state for pure substances Second law of thermodynamics » Thermodynamic cycles » Thermal efficiency » Entropy

• Only after a good understanding of this chapter (more like “remembering the information!”, you can comfortably proceed to later chapters eg. Chapter 2 – ‘Psychrometry’

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Building Services Engineering: Building Air Conditioning Module (ME5508), Brunel University

Heat transfer Basics

“Fundamentals of Thermal-Fluid Sciences” by Cengel & Turner, McGraw-Hill, ISBN 0-07-239054-9

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Building Services Engineering: Building Air Conditioning Module (ME5508), Brunel University

Psychrometery (Chapter 2: ‘Building Air Conditioning’ book)

 This chapter explains the principles of psychrometry as applied to the study of modern air conditioning systems
Learning Objectives
After covering this chapter and completing the personal feedback questions, you should be able to: Understand the properties of humid air

Given two properties of humid air, calculate other properties of interest for the same state point

Be able to use psychrometric tables and the psychrometric chart as practical tools for obtaining quickly the properties of humid air.

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Building Services Engineering: Building Air Conditioning Module (ME5508), Brunel University

Basics- Definition of Air Conditioning

Air conditioning may be defined as the simultaneous control of all (or at least the first three) of those factors affecting both the physical & the chemical conditions of the surrounding atmosphere within a structure.

These factors are:
1. 2. 3. 4. 5. 6. 7. Temperature Humidity Air movement Dust Bacteria Odours Toxic gases

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Building Services Engineering: Building Air Conditioning Module (ME5508), Brunel University

Basics- Air conditioned air

Air conditioned air: is air that has undergone one or a combination of the following processes: 1. Heating 2. Cooling 3. Humidification 4. Dehumidification 5. Circulation 6. Cleaning and...
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