A classic in its field, Air Conditioning Principles and Systems continues to fill the need for a text book on air conditioning systems that combines design principles . Air Conditioning Principles and Systems book. Read reviews from world's largest community for readers. Using a minimum of mathematics, this book explores. Air Conditioning Principles and Systems: An Energy Approach, 4th Edition. Edward G. Pita, P.E., (Emeritus) New York City Technical College. © | Pearson.
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Air-Conditioning-Principles-and-Systems-An-Energy-Approach-4th- Edition PREFACE his fourth edition of Air Conditioning Principles In addition to . Air Conditioning Principles and Systems An Energy Approach (4th Edition) - Ebook download as PDF File .pdf), Text File .txt) or read book online. Download Download Air Conditioning Principles and Systems: An Energy Approach | PDF books PDF Online Download Here.
Hydronic Piping Systems and Terminal Units. Cooling Load Calculations. Fluid Flow in Piping and Ducts. Piping, Valves, Ducts, and Insulation. Fans and Air Distribution Devices.
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No notes for slide. Download pdf Air Conditioning Principles and Systems: An Energy Approach Online 2. Book Details Author: Edward G. Pita Pages: Hardcover Brand: Description This book explores the fundamental concepts of air conditioning and their application to systems. The book explains all concepts in a clear, practical manner, and focuses on problems and examples typically encountered on the job.
Uses a minimum of mathematics. If you want to download this book, click link in the next page 5.
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You just clipped your first slide! When the outside air is cooler than the demanded cool air, this will allow the demand to be met without using the mechanical supply of cooling typically chilled water or a direct expansion "DX" unit , thus saving energy.
The control system can compare the temperature of the outside air vs. In both cases, the outside air must be less energetic than the return air for the system to enter the economizer mode. Packaged vs. Minisplit ductless systems are used in these situations.
Outside of North America, packaged systems are only used in limited applications involving large indoor space such as stadiums, theatres or exhibition halls. An alternative to packaged systems is the use of separate indoor and outdoor coils in split systems.
Split systems are preferred and widely used worldwide except in North America.
In North America, split systems are most often seen in residential applications, but they are gaining popularity in small commercial buildings. The split systems are a great choice for small buildings where ductwork is not feasible or where the space conditioning efficiency is of prime concern . The benefits of ductless air conditioning systems include easy installation, no ductwork, greater zonal control, flexibility of control and quiet operation .
The use of minisplit can result in energy savings in space conditioning as there are no losses associated with ducting. With the split system, the evaporator coil is connected to a remote condenser unit using refrigerant piping between an indoor and outdoor unit instead of ducting air directly from the outdoor unit.
Indoor units with directional vents mount onto walls, suspended from ceilings, or fit into the ceiling. Other indoor units mount inside the ceiling cavity, so that short lengths of duct handle air from the indoor unit to vents or diffusers around the rooms. Split systems are more efficient and the footprint is typically smaller than the package systems.
On the other hand, package systems tend to have slightly lower indoor noise level compared to split system since the fan motor is located outside. Dehumidification[ edit ] Dehumidification air drying in an air conditioning system is provided by the evaporator.
Since the evaporator operates at a temperature below the dew point , moisture in the air condenses on the evaporator coil tubes.
This moisture is collected at the bottom of the evaporator in a pan and removed by piping to a central drain or onto the ground outside. A dehumidifier is an air-conditioner-like device that controls the humidity of a room or building.
It is often employed in basements which have a higher relative humidity because of their lower temperature and propensity for damp floors and walls.
In food retailing establishments, large open chiller cabinets are highly effective at dehumidifying the internal air. Conversely, a humidifier increases the humidity of a building. Maintenance[ edit ] All modern air conditioning systems, even small window package units, are equipped with internal air filters. These are generally of a lightweight gauze-like material, and must be replaced or washed as conditions warrant.
For example, a building in a high dust environment, or a home with furry pets, will need to have the filters changed more often than buildings without these dirt loads.
Failure to replace these filters as needed will contribute to a lower heat exchange rate, resulting in wasted energy, shortened equipment life, and higher energy bills; low air flow can result in iced-over evaporator coils, which can completely stop air flow.
Additionally, very dirty or plugged filters can cause overheating during a heating cycle, and can result in damage to the system or even fire. Because an air conditioner moves heat between the indoor coil and the outdoor coil, both must be kept clean. This means that, in addition to replacing the air filter at the evaporator coil, it is also necessary to regularly clean the condenser coil.
Failure to keep the condenser clean will eventually result in harm to the compressor, because the condenser coil is responsible for discharging both the indoor heat as picked up by the evaporator and the heat generated by the electric motor driving the compressor. Energy efficiency[ edit ] Since the s, manufacturers of HVAC equipment have been making an effort to make the systems they manufacture more efficient.
This was originally driven by rising energy costs, and has more recently been driven by increased awareness of environmental issues. Additionally, improvements to the HVAC system efficiency can also help increase occupant health and productivity. There are several methods for making HVAC systems more efficient. Heating energy[ edit ] In the past, water heating was more efficient for heating buildings and was the standard in the United States. Today, forced air systems can double for air conditioning and are more popular.
Some benefits of forced air systems, which are now widely used in churches, schools and high-end residences, are Better air conditioning effects Even conditioning[ citation needed ] A drawback is the installation cost, which can be slightly higher than traditional HVAC systems.
Energy efficiency can be improved even more in central heating systems by introducing zoned heating. This allows a more granular application of heat, similar to non-central heating systems.
Zones are controlled by multiple thermostats.