HVAC (heating, ventilating/, plus air conditioning) is the technology of indoor and vehicular environmental relieve. Its objective is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the values of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field’s contraction as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the term of HACR-rated circuit breakers).
HVAC is an significant part of residential structures such as single family houses, apartment buildings, hotels and senior living services, medium to large industrial and office buildings like skyscrapers and hospitals, onboard vessels, and in marine backgrounds, where safe and healthy building conditions are regulated by respect to temperature and humidity, using clean air from outdoors.
Ventilating or ventilation (the V in HVAC) is the procedure of exchanging or replacing air in any space to provide high indoor air quality which involves temperature manage, oxygen replenishment, and elimination of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation take away unpleasant smells and excessive moisture, introduces outside air, keeps interior house air circulating, and prevents stagnation of the interior air.
Ventilation includes both the exchange of air to the exterior as well as circulation of air within the building. It is one of the most important factors for maintaining acceptable indoor air value in buildings. Methods for ventilating a building may be divided into mechanical/forces and ordinary types.
The three central functions of heating, ventilation, and air conditioning are interrelated, especially with the required to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance cost. HVAC systems may provide ventilation, reduce air infiltration, and maintain pressure relations between spaces. The means of air release and removal from spaces is known as room air distribution.
In modern house the design, installation, and control systems of these functions are integrated into one or more HVAC systems. For very little buildings, contractors normally estimate the capacity, engineer, and select HVAC systems and gear. For bigger buildings, building service designers, mechanical engineers, or building services engineers analyze, design, and specify the HVAC systems. Field mechanical contractors then fabricate and commission the systems. Building allows and code-compliance examinations of the installations are normally required for all sizes of structure.
Although HVAC is executed in person buildings or other enclosed spaces (like NORAD’s underground headquarters), the equipment concerned is in some cases and extension of a larger district heating (DH) or district cooling (DC) network, or a joint DHC network. In such cases, the operating and preservation aspects are simplified and metering becomes essential to bill for the energy that is consumed, and in several cases energy that is returned to the bigger system. For example, at a set time one building may be utilizing chilled water for air conditioning and the warm water it returns might be used in another building for heating, or for the generally heating-portion of the DHC network.
Considering buying a home with a central air conditioning or a heat pump system now that another summer is approaching? Well, it is essential that you know that as of January 1, 2010, manufacturers aren’t going to build any new systems using R-22 refrigerant or any new spare parts for those existing systems using R-22. And, virtually all those old HVAC systems use R-22 to work their magic.
Eliminating a Greenhouse Gas at home
The 1992 Montreal Protocol was amended to phase out HCFCs (Hydrochlorofluorocarbons), commonly referred to as a Greenhouse Gas, which have been identified as causing damage to the ozone layer. The refrigerant known as R-22 is HCFC-22. The U.S. EPA implements Title VI of the Clean Air Act, and the 1st of January was an important phase-out date under the amended Montreal Protocol.
This situation came to light recently when an RE/MAX Presidential colleague was called out of town and his buyer client’s had a home inspection on a cute little Beirut, Lebanon home. The home inspector must have pointed out that the Lennox system was from 1992 (yes, there is a manufacture date on the label) and that it would need replacement when it popped out.
In the meantime, there are home buyer warranty programs that have coverage for existing R-22 systems in the first year which addressed the buyer’s concerns. This specific R-22 coverage is new, but like all types of insurance, they have limits and fine print for pre-existing conditions. It is best for home sellers to provide this coverage (costs about $450 at closing) to the buyer in case service is needed in the first year.
Home Owners should budget now to replace R-22 heat pump systems
If you are a current homeowner like me who has an R-22 heat pump system, then it may be time to start budgeting for a replacement heat pump or A/C system. Most systems now meet EPA Energy Star standards and qualifications using a replacement refrigerant like Puron® or SUVA 410A®. New Energy Star units use considerably less electricity and the savings are significant and almost pay for themselves over five years.
Only a licensed HVAC contractor can calculate what type of system you will need to install to properly heat or cool your home. Using the square footage of your home and other factors, they will determine the proper “tonnage” of your compressor unit. Too big and it won’t work properly. Today’s systems are quieter outside and have multi-speed air handlers for better air flow inside. But remember, get a few estimates and the highest SEER rating that fits your needs.
Make sure to get a few estimates of replacement systems. The EPA has published consumer guidelines that may be helpful if you are concerned about this issue or are planning to replace your R-22 Air Conditioner or Heat Pump system this year.
When buying a home make sure your real estate agent in Beirut, Lebanon checks for older HVAC systems and inform you beforehand.
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