Infiltration (HVAC) - Factbites

Infiltration (HVAC) - Factbites
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Topic: Infiltration (HVAC)

Note: these results are not from the primary (high quality) database.

	APS ::Infiltration
		Uncontrolled infiltration may not provide fresh air where needed, and it cannot be turned off when the building is unoccupied.
		Wind will increase infiltration and tall buildings have a “stack” or “chimney” effect that draws air into the bottom of the building and forces it out the top.
		Air can enter the building in three ways: 1) intentionally via the HVAC system (to provide fresh air), 2) unintentionally through cracks and crevices in the building, 3) unintentionally through doors and windows as they are opened and closed throughout the day.
	www.aps.com /aps_services/business/waystosave/BusWaystoSave_72.html (304 words)

	HVAC Sizing Practice - Details
		The benefits of properly sizing HVAC systems include satisfied and comfortable customers, lower initial and operating costs, reduced callbacks, longer equipment run times and less cycling, and proper dehumidification during the cooling season.
		Using Manual J, a contractor calculates heat loss from the building through walls and ceilings, leaky ductwork, and infiltration through windows, doors, and other penetrations as well as heat gain into the building from sunlight, people, lights and appliances, doors, walls, and windows, and infiltration though wall penetrations.
		The Air Conditioning Contractors of America (ACCA) guidelines for sizing HVAC equipment, ACCA Manual J Residential Load Calculation, enables contractors to estimate heating and air conditioning loads more accurately.
	www.toolbase.org /techinv/techDetails.aspx?technologyID=184 (439 words)

	HVAC&R Research Journal - Volume 4, Number 2/April 1998
		The model showed that the infiltration load to a cold room depends on three dimensionless parameters: the Grashof number of the cold room, the aspect ratio of the room (height to width), and the opening ratio (height of doorway to height of the room).
		The model was used to predict the flow pattern and the temperature distribution in the cold room due to the infiltration through the doorway.
		HVAC&R Research is an international quarterly journal containing reports of completed research.
	xp20.ashrae.org /RESEARCH/vol4no2.htm (703 words)

	Fortress FAQ - Fiberglass vs Cellulose
		Air infiltration generally occurs in the areas of a home that are not insulated, such as around windows, doors, fireplaces, HVAC ductwork and perimeter joints.
		In field tests, fiberglass and cellulose insulations were considered equal in their impact on air infiltration, leading to the conclusion that air infiltration is dependent upon the sealant package, not the insulation type.
		But only 4% of the total loss from air infiltration occurs through sidewall cavities, and most of that is around electrical outlets, a problem easily solved with inexpensive, easy-to-install electrical insulated outlet gaskets.
	www.fortressinsulation.com /faq/faq_difference.htm (703 words)

	Indoor Air Quality (IAQ) and Home Remodeling
		Air movement associated with infiltration and natural ventilation is caused by air temperature differences between indoors and outdoors and by wind.
		When there is little infiltration, natural ventilation, or mechanical ventilation, the air exchange rate is low and pollutant levels can increase.
		Whether a mechanical ventilation system makes sense in your existing homes depends on the house, your existing heating, ventilation, and air-conditioning (HVAC) system, and the changes you have planned.
	www.epa.gov /iaq/homes/hip-ventilation.html (660 words)

	Indoor Air Quality (IAQ) and Home Remodeling
		Air movement associated with infiltration and natural ventilation is caused by air temperature differences between indoors and outdoors and by wind.
		Whether a mechanical ventilation system makes sense in your existing homes depends on the house, your existing heating, ventilation, and air-conditioning (HVAC) system, and the changes you have planned.
		Outdoor air enters and leaves a house by: infiltration, natural ventilation, and mechanical ventilation.
	www.epa.gov /iaq/homes/hip-ventilation.html (660 words)

	Petrie Heating and Cooling-HVAC Services-Cookeville, Tennessee-Home
		Petrie Heating and Cooling is a full-service provider of residential HVAC solutions.
		If you are not currently a Petrie Heating and Cooling customer, we would welcome the opportunity to become your HVAC contractor of choice.
		We also offer a variety of effective IAQ (Indoor Air Quality) products and services including “Whole House Air Infiltration” analysis and repair services.
	www.petriecompany.com (660 words)

	OC History - New Building Systems Go for Growth
		The system compares various choices regarding insulation placement and type, along with decisions related to the HVAC system, piping and ducts.
		The system provides superior storm and fire resistance while enhancing acoustical and air infiltration qualities.
		“Although these systems are relatively new to Owens Corning and still in their infancy in terms of the total market, others have been working on the technology for many years,” continues Brown.
	pressroom.owenscorning.com /new_building.html (660 words)

	Ontario Propane Association Heat Loss
		For these reasons, a proper calculation can only be made by a professional HVAC technician.
		For correct results, factor relative to air infiltration and the heat distribution system must be considered.
		Correct sizing of heating equipment involves calculating heat loss, or how many BTUs are lost from the heated interior of the home to the outside atmosphere.
	www.propane.ca /resources/heatloss.asp (660 words)

	Glossary of terms in home theater design, room acoustics and related topics
		Factors that must be addressed in achieving satisfactory NC performance typically include mechanical (HVAC) design and the construction detailing of the room's envelope, i.e., its walls, ceiling, floor, windows and doors, in order to reduce noise infiltration from areas exterior to the room.
		A venue's use and its RT must be consonant: A home theater with a 6 second RT would render movie dialog unintelligible, while a cathedral with a 0.3 second RT would deflate its sonic grandeur.
		Helmholtz argued that perception was based upon a process of inference, in which, through past experience, we infer from the sensations we receive at a given time the nature of the object or event that they probably represent.
	www.keithyates.com /glossary.htm (11420 words)

	Glossary of terms in home theater design, room acoustics and related topics
		Factors that must be addressed in achieving satisfactory NC performance typically include mechanical ( HVAC) design and the construction detailing of the room's envelope, i.e., its walls, ceiling, floor, windows and doors, in order to reduce noise infiltration from areas exterior to the room.
		This term usually refers to the repetition rate of a periodic waveform and is expressed in Hz (cycles per second) or kHz (thousands of cycles per second).
		This term was applied to auditory perception by Frances to designate the auditory information upon which listeners focus their attention at a given moment.
	www.keithyates.com /glossary.htm (11420 words)

	HVAC Duct Liner is composed of rotary-type glass fibers., CertainTeed Corp.
		HVAC Duct Liner is composed of rotary-type glass fibers., CertainTeed Corp.
		HVAC Duct Liner is composed of rotary-type glass fibers.
		It also serves as a barrier against infiltration of dust and dirt into the insulation, improves system efficiency, exhibits low air resistance, and reduces the potential for fiber erosion.
	news.thomasnet.com /fullstory/461131 (726 words)

	WorldChanging: Another World Is Here: Add to Brian Eno's "250 Projects"
		What You can See from a Window - one square foot of sunlight, orientation to the sun, design principles, window types, glazing, heat loss, infiltration, insulation, heating ventilating and air conditioning (HVAC), air purification, breathing
		The space elevator should be ready for construction within two years and we could have an operational one in 15 years.
		The construction of a space elevator will greatly reduce the cost of accessing space and allow us inexpensive access to the resources and opportunities it offers.
	www.worldchanging.com /archives/000091.html (726 words)

	Green Building Encyclopedia - Glossary of Green Building Terms
		Positive building pressurization is usually desirable to avoid infiltration of unconditioned and unfiltered air.
		Positive pressurization is maintained by providing adequate outdoor makeup air to the HVAC system to compensate for exhaust and leakage.
		The air pressure within a building relative to the air pressure outside.
	www.whygreenbuildings.com /glossary.php (6282 words)

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