Air handling unit or ahu is an assembly of air conditioning components such as fans, cooling coils, filters, humidifiers and dampers integrated into a selfcontained package and installed as a single unit, which is connected to system of metal duct work that distributes the conditioned air. A all air system b all water system c airwater system d unitary refrigerant based system a all air systems as the name suggests, air is used as the media in an all air system. Air conditioner working principle in summer air conditioning system. Introduction to commercial building hvac systems and energy. A chilling water systems refrigeration cycle works by removing heat from chill water in the evaporator of the chiller. Hvac systems are complex and the extent of actual or potential energy savings will vary greatly from one hvac system to another. The chilled water supply chws is pumped through the.
Hvac economizers 101 principles and operations for efficiency greg jourdan, wenatchee valley college. This liquid changes to the gas and evaporates as it extracts heat from the air around it and under low pressure conditions it is converted into liquid again and after entering the normal pressure range it is. The heating, ventilation and air conditioning hvac system of any building is like the respiratory system of a human being. The basic function of the ahu is take in outside air, condition it and supply fresh air to a building. Jan 06, 2017 an air conditioner ac in a room or a car works by collecting hot air from a given space, processing it within itself with the help of a refrigerant and a bunch of coils and then releasing cool air into the same space where the hot air had originally been collected.
This system is useful for applications where the temperature required is more than 32 degree f. An air handling unit ahu is used to condition and circulate air as part of a heating, ventilating, and airconditioning system. Unfortunately, the design of vrf systems is more complicated and requires additional work compared to designing a conventional direct expansion dx system. The refrigerant vapour from the evaporator is compressed to high pressure by the compressor. For plant cooling, continued operation under the most extreme. The student will be introduced to thermodynamics and psychrometrics, plans and specs, space.
Heating, ventilation, and air conditioning hvac 2 latent heat 3 mechanical refrigeration 6 relative humidity rh 4 temperature 2 key terms after studying this chapter, the reader should be able to. This is the largest and the main component of the commercial hvac system. Does working on your house make it feel more like a home. This is both a building system designed to keep the environment comfortable for building occupants and the industry that supports these systems.
A condenser water pump and chemical treatment for the condenser water loop adds to the maintenance required with a watercooled system. University of colorado boulder, co, usa overview system description secondary hvac systems air distribution room diffusers and air terminals duct design fan characteristics air handling units water distribution cooling coils pipes and pumps primary hvac systems electric chillers. The examples and energysavings potential discussed in this guide are not intended as specifications for implementation, nor should they be. List uses for heat pumps, air conditioners, and humidifiers. An assembly of all above components forms an hvac system. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Heat flow is a basic principle of refrigeration in fact, of all hvac work.
With a higher efficiency and increased controllability, the vrf system can help achieve a sustainable design. Thats the basic principle you have to work with in duct design. A well designed hvac system also provides 112 environmental protection, operator protection as well as comfortable working conditions for 1 operators. In this system, the air is cooled and generally dehumidified. The compressor is driven by the engine through a belt drive. The simplest control in hvac system is cycling or onoff control to meet part load conditions. Mahatma gandhi missions college of engineering and technology. After 54 a revision, the second edition of the document was. How a chilled water system works hvac training shop.
The automotive air conditioning system includes thecompressor, condenser, evaporator, receiverdehydrator and connecting lineswhich includes expansion valve, orifice tube, suction throttling valve,positive operating absolute valve, evaporator pressure regulator valve, thermal sensor, high pressure cut off switch and cycling compressor switch. This book has been written especially for use in programs where a full curriculum in refrigeration is offered. As always, contact your local trane comfort specialist if you have additional questions. Fundamentals of hvac ppt a7 m01 final ppt video online download.
It controls the movement, quality and temperature of air to ventilate, warm and cool the organism. The process water is the means by which heat transfers from the process to the chiller. The outside air flows through the damper and mixed with recirculated air which is. Schematic for a typical summer air conditioning system is arranged. Get the basics about hvac systems so you can make an educated purchasing decision. Energy is consumed by the parts of the system that heat and cool the air and movement. This principle is also used for baseboard heaters and portable heaters. Air conditioning has changed over the years, the hvac system is used to control the environment in the manufacturing as well as the storage area of the. The basic principles of duct design, part 1 energy vanguard. Ppt chilled water basics powerpoint presentation free. If building only needs half the energy that the system is designed to deliver, the system runs for about ten minutes, turns off for ten minutes, and then cycles on again. Hvac systems understandinghvac systems understanding the basisthe basis.
Hvac air distribution equipmentshvac air distribution equipments 5. A system that does any one or more of those tasks is called a hvac system. Ppt chilled water basics powerpoint presentation free to. Heating, ventilation, and airconditioning hvac systems ppt. May 21, 2007 heat flow is a basic principle of refrigeration in fact, of all hvac work. A hvac system is a heating, ventilation, and airconditioning system. Ahus connect to ductwork that distributes the conditioned air through the building, and returns it to the ahu. For example, in the refrigeration cycle, the evaporator cooling coil is colder than the air flowing around it, so heat flows from the warmer air into the evaporator. The ahu is a large metal box containing separate ventilators for supply and exhaust, heating coil, cooling coil, heatingcooling recovery system, air filter racks or chambers, sound attenuators, mixing chamber, and dampers. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Rooms typically have several complete air changes per hour. The examples and energysavings potential discussed in this guide are not intended as specifications for implementation, nor should they be considered to provide instruction on how to. In most process cooling applications, a pumping system circulates cool water or a waterglycol solution from the chiller to the process.
As the air moves through a duct, it interacts with the surfaces. Vaporcompression refrigeration, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. Control systems for heating, ventilating, and air conditioning, by roger haines. Hvac ducting principles and fundamentals 2012 instructor. Hvac software for building hvac control or building management system bms an assembly of all above components forms an hvac system. Combustion ends before the blower motor stops working, so all the warm air in your heat exchanger and your ductwork will get to the rooms of. Principles of hvac principles of hvac course description.
Experiment with a working economizer unit under normal operations and. Its important to understand how different heating and cooling distribution systems work. You cant, for instance, do much with your vehicles engine without knowing how it works, and the same principle applies when it comes to the hvac system cooling down your macon, georgia, home this summer. Working principle, types and comparison with vapor compression system, saving potential 4. The objective of an hvac system is to ensure that an indoor environment is both safe and comfortable for humans. An air conditioner ac in a room or a car works by collecting hot air from a given space, processing it within itself with the help of a refrigerant and a bunch of coils and then releasing cool air into the same space where the hot air had originally been collected. In the background of hvac system, an hvac water chiller produces chilled water which is then circulated throughout the building or space upto cooling coils in air handling units. The premise of this method is that any hvac system can be dissected into basic subsystems. Sep 22, 2015 the working of automotive air condition system is similar to all other air conditioning system. The big air conditioner boxes that you might see on top of apartment blocks or offices are examples of the visible part of hvac systems.
Ive written previously about the two factors involved in reducing air flow in ducts. Introduction to commercial building hvac systems and. Anytime a liquids change to a gas vapor, it must give up its heat and the heat is carried off in the. Safety here mainly concerns the indoor air quality or iaq, meaning that the indoor air. Hvac systems understandinghvac systems understanding the basisthe basis table of contentstable of contents 1. Air conditioner hvac systems what is a hvac system. Jun 22, 2017 covering the basics, showing the typical system along with the main components and an animated drawing explaining its operation in both cooling and heating mode as well as how the refrigerant works. Courses in heating, ventilation and air conditioning hvac are usually offered in departments of mechanical engineering, civil engineering, architecture and building science. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Generally, it contains an air conditioner designed to cool refrigerant outside of your house, and a furnace with a fan or coil inside the house. Often installed into a single system, these three functions of the hvac system are closely interrelated to provide thermal comfort and to. This course will provide the salesperson, engineer or technician with a strong foundation and a thorough understanding of the principles of heating, ventilating and air conditioning. If you get a highquality system, youre never going to feel uncomfortable at the height of summer or in the dead of winter. Hvac economizers 101 principles and operations for efficiency.
The waterlithium bromide vapor absorption system is used in a number of air conditioning applications. Introduction definition air conditioning is the process of altering the properties of air primarily temperature and humidity to more favorable conditions. Examples include adequate lighting, and proper furniture and work surfaces. However, the material covered and the method of presentation are such that the text is also suitable for adult evening classes and for onthejob training and selfinstruction. These systems feature ductwork, which carries air throughout. Contents introduction to conventional technical systems in buildings hvac, electrical systems and servicesweek 1 hvac system types, working principles and. May 29, 2017 does working on your house make it feel more like a home.
In a large system there will also be a tangle of tubes to distribute the air and collect it again. Ppt on hvac system selection for powerpoint slides. This cool fluid removes heat from the process and the warm fluid returns to the chiller. Basic classification of hvac systems for selection guide. Here are some special features of the water and lithium bromide in an absorption refrigeration. Vapor compression refrigeration system basic, working. Design guide for heating, ventilating, and air conditioning systems.
Covering the basics, showing the typical system along with the main components and an animated drawing explaining its operation in both cooling and heating mode as well as how the refrigerant works. How air conditioning works the essential ingredients in an air conditioning system are a fan to blow air around, a cold surface to cool and dehumidify the air, a warm surface and a source of water vapour. However, watercooled chillers have higher efficiency and therefore lower operational costs. Airconditioning hvac systems as they relate to energy code requirements. Most air conditioning and heating systems require some form of duct work to channel or direct the. In recent years, dc inverter air conditioner is becoming more popular compared to the conventional air conditioner due to its many advantages.
Classification of hvac systems based on the working fluid used in the thermal distribution system, hvac systems can be classified as3. Airconditioning hvac systems as they relate to energy code. A good hvac system aims to provide thermal control and indoor comfort, and one that is designed using the principles of thermodynamics, fluid mechanics, and heat transfer. In the condenser of the chiller, the heat is transferred to the condenser water, or directly to the outside air well talk more about this below. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. As the building load increases, the system runs longer and its off period is. It has different parts those help to maintain the required temperature and humidity in the manufacturing area. Electrical heaters are often used as backup or supplemental heat for heat pump systems.
Sep 21, 2015 your hvac system is the core of heating and cooling within your home. Part of being a handyman or handywoman means knowing how things tick. The articles referenced here will give you a full and complete. Introduction to hvac systemsintroduction to hvac systems 2. Hvac system is a basic requirement of a pharmaceutical manufacturing facility. Principles of heating, ventilation and air conditioning with worked examples by by nihal e. Learn about the most common hvac systems and equipment, along with energyrelated components and controls. The smoother that inner surface is, the better it is for air flow. How air handling units work ahu working principle hvac ventilation. Air warm air systems distribute heated air through duct work systems of supply and return air through metal or fiberglass ducts. The outside air flows through the damper and mixed with recirculated air which is obtained from the conditioned space. Hvac system operation is a major driver of building energy consumption. In a single zone allair hvac system, one control device such as thermostat located in the zone controls the operation of the system, as shown in.
The purpose of this period is to provide a method for understanding the components of different types of hvac systems. This hvac training video will identify the purpose and goals of the hvac system, describe basic hvac parts, and explain how the parts work. In order to have a better understanding if these systems, you need to know some of the principles behind hvac design. Anytime a liquids change to a gas vapor, it must give up its heat. Guide to hvac design, theory of operation, and primary. Refrigerant has a low boiling point, making it ideal for hvac systems. Hvac systems cooling systems air distribution systems principles of refrigeration air conditioning and.
Aug 10, 2017 heating and air conditioning split system. Inside the furnace, there is a heat exchanger which helps to switch on when the furnace is activated. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Hvac is an acronym for heating, ventilation, and air conditioning. This book is written mainly with the interests of students and instructors in these departments in mind. A slightly positive pressure to reduce outside air infiltration. Coordination of hvac and fire detection and alarm system 74. Winner of the standing ovation award for best powerpoint templates from presentations magazine.
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