In modern buildings, the design, installation, and control systems of these functions are integrated into one or more HVAC systems. For very small buildings, contractors normally estimate the capacity and type of system needed and then design the system, selecting the appropriate refrigerant and various components needed. For larger buildings, building service designers, mechanical engineers, or building services engineers analyze, design, and specify the HVAC systems. Specialty mechanical contractors and suppliers then fabricate, install, and commission the systems. Building permits and code-compliance HVAC inspections of the installations are normally required for all sizes of buildings.
The technology of indoor and vehicular environmental comfort is called HVAC, which stands for heating, ventilation, and air conditioning system. 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.
Heating, Ventilation, and Air Conditioning System
Heating, ventilation, and air conditioning system 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.
Heating, Ventilation, and Air Conditioning
So, as was said above, HVAC refers to the different systems used for moving air between indoor and outdoor areas, along with heating and cooling both residential and commercial buildings. They are the systems that keep you warm and cozy in the winter and feeling cool and fresh in the summer. They also are the systems that filter and clean indoor air to keep you healthy and maintain humidity levels at optimal comfort levels.
HVAC is a common term that people use, and most have a general idea of what it's referring to. On the other hand, how does HVAC work? And, how does it apply to your home? Petro Home Services provides full home services in addition to our HVAC solutions, and we can give you the lowdown on HVAC basics.
Purpose of the HVAC System
The purpose of the HVAC system is more than just warming or cooling a space. Instead, it serves to improve indoor air quality and provide comfort for everyone inside a building. While there are several different types of HVAC systems, they all begin with the same essentials…
First, there is a source of fresh air intake from the outside or from within the home. This process is called ventilation, and it happens in two different ways. Natural ventilation is present in most homes and refers to the way air typically moves in and out through windows, doors, vents, and other openings. This exchange of air is necessary to replenish oxygen, and to remove odors, carbon dioxide, unpleasant odors, and excessive moisture.
Mechanical ventilation uses a mechanical system to move air in and out. In the past, there was plenty of natural ventilation in most homes from gaps and cracks in the construction along with the opening and closing of doors. However, modern construction is creating homes that are far more tightly sealed so ventilation is becoming an increasingly important component in home HVAC systems. When the air is brought in, it is drawn into an air handling unit where the work begins. Here, air is drawn through filters to remove dirt, dust, allergens, and other particles. Next up is comfort. Air is either sent to be heated or sent to be cooled and have excess humidity removed.
Once the air is clean, fresh, and at a comfortable temperature, it is directed into the home. For central systems, this means moving through a network of ducts and registers to different rooms. For other systems, this usually means being directed right into the space.
How does HVAC Work?
Each component in your home may be separate, such as a radiant system combined with window air conditioning units. However, it is more common for combined systems such as central heating and AC systems that use a single blower to circulate air via internal ducts in a home, or with a ductless system for different rooms or zones in the house.
What is Involved in HVAC Inspection
You may have wondered what is involved in HVAC inspection and why you should consider it. Well, performed by one of the qualified specialists of Army of Builders, HVAC inspections will tell you how your home’s heating and cooling systems are functioning, and if any repairs are warranted, as well as replacement. Simple HVAC inspections may be performed with your annual preventative maintenance service visit. It’s a great value for homeowners to have their systems assessed each year, to ensure proper functioning and efficiency. Inspections can provide a ‘heads up’ which alerts the owner of needed repairs, before operating the system does additional damage.
Every contractor’s process may be slightly different, so it’s smart to ask your preferred professional what they include in their cost of HVAC inspection. In general, HVAC inspections usually include the following:
- Test the thermostat’s calibration
- Check air filter
- Inspect blower components
- Test for correct airflow through units and home
- Inspect electrical connections
- Inspect quality of installation
- Inspect areas where equipment is located
- Inspect equipment condition
- Inspect condenser and evaporator coils for air conditioning units
- Evaluate system starting capabilities
- Test safety controls
- Evaluate temperature differentiation
- Test refrigerant pressure
- Examine condensate drains and drip pan
- Examine heating and air conditioning equipment versus air handler for proper match
- Evaluate heat pump heating mode and defrost cycle
- Evaluate operation of backup heating source
- Examine heat exchanger, ignition and burner assemblies
- Test venting and clearances
- Test combustion air
- Test gas pressure and piping