Air Conditioning System : Air Conditioning System BY
.Ahmed Abd Allah Kasem
3rd year Mech. Power. Engg,
.ASHRAE Student Member 2009 Classification of Air Conditioning Systems : Classification of Air Conditioning Systems Air conditioning systems are divided into three types as followed:
Unitary Packaged Systems.
Central (Hydronic) Systems. Individual Systems : Individual Systems use a self-contained , factory-made air conditioner to serve one or two rooms (e.g. room/ window air conditioner and split-type units).
It uses vapor compression cycle directly to cool the indoor air for small loads. Unitary Packaged Systems : Unitary Packaged Systems similar in nature to individual systems but serve more rooms or even more than one floor, have an air system consisting of fans, coils, filters, ductwork and outlets (e.g. in small restaurants, small shops and small cold storage rooms). Central (Hydronic) Systems : Central (Hydronic) Systems Basically consists of three major parts:
Air system – air handling units (AHU), air distribution (air duct) system and terminals.
Water system – chilled water system, hot water system, condenser water system.
Central plant – refrigeration (chiller) plant, boiler plant. Air system : Air system An air-handling unit (AHU) is the basic piece of equipment used in an air system. It can be either a field-assembled built-up system or a factory-made unit. Air Handling Units (AHU)
Air Distribution System (Air Duct) Ducts are used in heating, ventilation, and air conditioning (HVAC) to deliver and remove air. These needed airflows include, for example, supply air, return air, and exhaust air 1-AIR HANDLING UNIT : 1-AIR HANDLING UNIT AIR HANDLING UNIT : AIR HANDLING UNIT 2-Duct System : 2-Duct System Air flow : Air flow Click on the picture to review the animation. Note that arrow velocity doesn’t represent the actual air velocity WATER SYSTEM : WATER SYSTEM Click on the picture to review the animation. chilled water system, hot water system, condenser water system. All of them are consists of pipelines and pumps. (Chiller)Central plant : (Chiller)Central plant Chillers are a key component of air conditioning systems for large buildings. They produce cold water to remove heat from the air in the building.
Common Types of Chillers
Mechanical Compression (VCC).
Absorption Chillers. Slide 25: AIR COOLED CHILLER Slide 28: WATER COOLED CHILLER The Goal Of A.C System Design : The Goal Of A.C System Design The goal of an air conditioning system design is to achieve a highly quality system that functions effectively and is energy-efficient and cost-effective.
The following are essential for a system to function effectively:
All design criteria are fulfilled, and the requirements of the owner and the user are satisfied.
A good indoor air quality is provided.
The system is reliable and has adequate fire protection level (e.g. smoke management). Air Conditioning System Selection : Air Conditioning System Selection When considering and selecting an air conditioning system, the designer must understand the building and the client’s requirements and try to study and evaluate the following factors:
Building location, surrounding environment and external climate
Uses and functional requirements of the building
Client’s budget, investment policy and expected quality of service Air Conditioning System Selection : Air Conditioning System Selection The designer should consider various system options and recommend one or several that will be likely to perform as desired. Some of the selection criteria include
Performance requirements – on comfort, noise, control options, flexibility and meeting requirements of local regulations/codes.
Capacity requirements – range of capacity, multiple units, zoning, etc.
Spatial requirement – plant room space, space for ducting and piping (vertical shafts),space for terminal equipment.
Costs – initial cost, operating cost and maintenance cost.
Energy consumption – for both economic and environment reasons.
System qualities – e.g. aesthetics, life, reliability and maintainability. THE END : THE END THANK YOU FOR YOUR TIME.
For any comments.
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