HVAC - Mechanical Engineering

This readily accessible App introductory resource was developed for anyone who has interest in, or works with, HVAC controls and equipment.
Designed for electrical and HVAC apprentices learning about the subject in school, you will find the descriptive text and original diagrams easy to navigate through, while the question bank will help students review the subject matter covered in each section.
Heating, ventilation, and air conditioning (HVAC)[1] is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space.
Its goal is to provide thermal comfort and acceptable indoor air quality.
HVAC system design is a 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 "ventilation" is dropped, as in HACR (as in the designation of HACR-rated circuit breakers).
HVAC is an important part of residential structures such as single family homes, apartment buildings, hotels, and senior living facilities; medium to large industrial and office buildings such as skyscrapers and hospitals; vehicles such as cars, trains, airplanes, ships and submarines; and in marine environments, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.
Ventilating or ventilation (the "V" in HVAC) is the process of exchanging or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases.
Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air.
Methods for ventilating a building are divided into mechanical/forced and natural types.[2]
Abstract
HVAC systems are milestones of building mechanical systems that provide thermal comfort for occupants accompanied with indoor air quality.
HVAC systems can be classified into central and local systems according to multiple zones, location, and distribution.
Primary HVAC equipment includes heating equipment, ventilation equipment, and cooling or air-conditioning equipment.
Central HVAC systems locate away from buildings in a central equipment room and deliver the conditioned air by a delivery ductwork system.
Central HVAC systems contain all-air, air-water, all-water systems.
Two systems should be considered as central such as heating and cooling panels and water-source heat pumps.
Local HVAC systems can be located inside a conditioned zone or adjacent to it and no requirement for ductwork.
Local systems include local heating, local air-conditioning, local ventilation, and split systems.
App HVAC Include :
Lowes ac installation
velocity air conditioning
HVAC heating and air
HVAC maintenance service
emergency HVAC service
ac and heating repair
heating and air conditioning service
home ac repair
commercial air conditioning repair
best ac repair
efficiency mechanical heating & cooling
heating and cooling
Mechanical Cooling General Applications
Hydronic Cooling Systems
Phase Changes
The DX Cooling Cycle
Mechanical Cooling Principles
Gas Laws
Direct Expansion Air Conditioning Systems
Thermostats General
Baseboard Heat
Unit Heaters
In-Floor Heating
Gas Heat Control
Thermocouples
Line Voltage Thermostats
Electric Heat General
Central Electric Heat
Portable Heaters
Pilot Lights

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