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HVAC (pronounced as an acronym or as “aitch-vac,” depending on individual preference) stands for heating, ventilation, and air conditioning. HVAC systems are designed to regulate all of those functions within an indoor environment – whether residential or commerical. While technically many appliances have HVAC properties, the term usually refers to a large system of vents and ducts used to service a house or workplace.
HVAC Duct Sizing
Please Note: All information provided in this document is to be used as a guideline only.
The duct sizes listed in the chart provided are based on a fraction drop of .10 inches per 100 feet of lineal duct. This "Equal-Friction" method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Larger volumes or higher static pressures should be dealt with on an individual job basis.
Example: Ductwork Design Layout (With CFM Ratings)
This system is designed to move 3 Tons of Air Conditioning or 1200 CFM.
HVAC Chillers
A chiller is part of a condenser. Chillers are used to cool water or brine solutions. The cooled (chilled) water or brine is fed through pipes to evaporators. This cools the area in which the evaporators are located. This type of cooling, using chilled water or brine, can be used in large air-conditioning units. It can also be used for industrial processes where cooling is required for a particular operation.
Figure 8-11 illustrates such an operation. Note how the compressor sits atop the condenser. Chillers are the answer to requirements of 200 to 1600 ton of refrigeration. They are used for process cooling, comfort air-conditioning, and nuclear power plant cooling. In some cases, they are used to provide ice for ice-skating rinks. The arrows in Fig. 8-11 indicate the refrigerant flow and the water or brine flow through the large pipes. Figure 8-12 shows the machine in a cutaway view. The following explanation of the various cycles will provide a better understanding of the operation of this type of equipment.
HVAC Diffuser Types
The diffuser on the left is a normal office type diffuser which induces a lot of air to rise vertically from the floor towards the ceiling. The rising induced air has the potential for carrying a lot of dust upwards which is then spread throughout the room with the air supply. This type of diffuser readily spreads contaminants in the room and should be avoided.
The preferred type of diffuser for cleanroom applications is the swirl diffuser, or perforated plate diffuser. These types do not promote the spread of dust within the room.
HVAC Air Conditioning Ducts
Duct Air Conditioning
Central Air Conditioning Ducts, Parts, Filters Cleaning Equipment . Air duct cleaning refers to the cleaning of all the air condition parts including the air conditioning filter, fan and air ducts in an air conditioning unit. An bare conditioner is one of the near pregnant aspects of our modern world. It has go an indispensable portion of our lives. It has high school quality to celebrate your home nervelesMini-Duct Air Distribution System - ToolBase Services by NAHB . Many owners of older homes without forced-air HVAC systems, would like to add central air conditioning and/or heating ducts, but are daunted by the cost and difficulty of .
Air Conditioning Ducts, Parts & Filters Cleaning Equipment, HVAC . Air ducts, often referred to as ducts, direct the air flow throughout your heating, ventilation, and air conditioning (HVAC) system. Thorough air duct service should be .
SpacePak; The Small Duct High Velocity Central Air Conditioning System SpacePak is a high velocity, central air-conditioning system that uses small (or mini) flexible ducts, which take up far less space than traditional ductwork, and can be .
Installing Central Air Conditioning Ducts | eHow Installing Central Air Conditioning Ducts. The first thing to consider when installing air conditioning ducts is layout. You will want your ducts to reach every room .
HVAC Packaged Unit
Transparent packaged Air Conditioner, Capacity 5000 Btu / h, compressor 1/2Hp
Made for the Training of Engineers Technology
HVAC Water Distribution
Types of Water Distribution Systems
Water-distribution systems are either closed-loop (cooling- or heating-system water does not come in contact with outside air) or open-loop (condenser water is exposed to outside air, usually in the cooling tower). Water in a closed loop requires less treatment than water in an open system.
Distribution systems for chilled water and heating water
HVAC Function
Purpose, Design Basics, and Function of HVAC Systems
PurposeAn HVAC system provides adequate indoor air quality by: conditioning the air in the occupied space of a building in order to provide for the comfort of its occupants; diluting and removing contaminants from indoor air through ventilation; andproviding proper building pressurization.17
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Sample HVAC System. Click for larger image.
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- Outside air intake
- Air handling unit—a system of fans, heating and cooling coils, air-flow control dampers, air filters, etc.
- Air distribution system
- Air exhaust system.17
In general, outside (“supply”) air is drawn into a building’s HVAC system through the air intake by the air handling unit (AHU). Once in the system, supply air is filtered to remove particulate matter (mold, allergens, dust), heated or cooled, and then circulated throughout the building via the air distribution system, which is typically a system of supply ducts and registers.17
In many buildings, the air distribution system also includes a return air system so that conditioned supply air is returned to the AHU (“return air”) where it is mixed with supply air, re-filtered, re-conditioned, and re-circulated throughout the building. This is usually accomplished by drawing air from the occupied space and returning it to the AHU by: (1) ducted returns, wherein air is collected from each room or zone using return air devices in the ceiling or walls that are directly connected by ductwork to the air-handling unit; or (2) plenum returns, wherein air is collected from several rooms or zones through return air devices that empty into the negatively pressurized ceiling plenum (the space between the drop ceiling and the real ceiling); the air is then returned to the air-handling unit by ductwork or structural conduits.1,17
Finally, some portion of the air within is exhausted from the building. The air exhaust system might be directly connected to the AHU and/or may stand-alone.
HVAC stands for heating, ventilation and air conditioning. These three systems are closely related and very commonly used in homes and offices. The basic function of HVAC systems is to maintain good air quality indoors by providing proper ventilation and temperature control. These systems are so popular because they are energy efficient and effective.The purpose of a heating system in a HVAC system is to maintain adequate room temperature. In these systems, heating can be of two types- central and local. A heating system is generally made up of a heat pump, a radiator and furnace or a boiler. Each of these has a specific function in the heating system.
Ventilation systems are concerned with air movement. The main purpose of a ventilation system is to ensure that carbon dioxide goes out and oxygen comes in a room so that people can inhale fresh air. If a ventilation system is not installed, stagnant air will cause sickness and allergies. However, a proper ventilation system must be maintained because an inefficient system would result in the growth of bacteria and fungi in a room because of humidity.
The air conditioning system in a HVAC system controls temperature and ventilation both. It generally has large air ducts. So, before installing such systems, it must be ensured that the building or residency has enough space for their installation. It must always be ensured that air ducts are cleaned properly or else pathogens will start thriving in them and cause problems.
About
HVAC (heating, ventilation, and air conditioning) refers to technology of indoor or automotive environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers). HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to temperature and humidity, using "fresh air" from outdoors.
HVAC (heating, ventilation, and air conditioning) refers to technology of indoor or automotive environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers). HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to temperature and humidity, using "fresh air" from outdoors.
HVAC
HVAC (heating, ventilation, and air conditioning) refers to technology of indoor or automotive environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers).
HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to temperature and humidity, using "fresh air" from outdoors.
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