AIVC - Air Infiltration and Ventilation Centre

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air tightness

Low energy steel buildings. Energisnala stalhaller.

A handbook of constuction techniques for achieving a low air change rate and good insulation in steel buildings. Insulating materials and how to avoid cold bridges are discussed. Air leakage, moisture problems and comfort questions are also considered. Examples are presented of a small industrial building andof a tennis hall.

Controlled mechanical ventilation of housing improves humidity balance. Kontrollierte wohnungsluftung verbessert feuchtebilanz.

The Heat Protection Ordinance (Warmeschutzverordnung EnEG) issued in 1977 aimed to reduce heating energy consumption and has become part of the building ordinances. Beside the heat transmission resistance (k-value-a measure for the size of the heat transmission losses), also the crack flow exponent (a-value) has been controlled to reduce ventilating heat losses. Practical experience has shown that, without mechanical ventilation, hygienic, physiological and building physical disadvantages will turn up.

The seventh low-energy house at Hjortekaer, Denmark.

A short description of a second generation low-energy house built at Hjortekaer in 1984, with a calculated annual heat demand of 3500 kWh (excluding domestic hot water), is given. The house is superinsulated and very airtight. The roof and walls are insulated with 400 and 300 mm of high quality mineral wool respectively, with infinitesimal thermal bridges, and the floor is a slab-on-grade construction insulated with 200 mm polystyrene. Most of the windows are south facing and fitted with a new type of lightweight external insulating shutter.

Two Swedish houses with superinsulation and warm air heating.

Examines the design of two houses, built in 1982, which integrate an exhaust air heat pump and a warm air heating system into a very well insulated structure. Monitored during 1983-84, they consumed 50% less energy than a typical Swedish house. Apart from occasional (avoidable) high temperatures, the warm air heating system led to a comfortable indoor climate. The performance of the houses could be improved by installing energy conservation appliances. The house of the future should be tight, well-insulated and mechanically ventilated.

Radon-222 and 222Rn progeny concentrations measured in an energy-efficient house equipped with a heat exchanger.

Radon-222 and 222Rn progeny concentrations, barometric pressure and pressure differentials between inside and outside were measured continuously in the basement of a recently constructed energy-efficient house in metropolitan Denver, Colorado

Precast panel wall assemblies

Discusses control of condensation, and moisture transfer through walls. Various air pressure barriers are suggested to control leakage. One-, two- and three-stage joint methods of wall construction are compared.

Steel buildings with low annual energy consumption.

Energy efficient steel buildings with better thermal insulation to reduce transmission losses are now being built in Sweden. Examples of structural design are given to minimise the influence of thermal bridges. A method for the calculation of such heat losses is presented. Principles for airtightness to reduce air leakage of buildings are discussed, special details and material requirements are given.

Ventilation in building.

Presents four short articles treating aspects of building ventilation: 1) Achieving a balance - the work of the AIC, 2) House full of horrors - indoor air pollution and progress in eradicating hazards, 3) Letting off steam - test houses with ventilation system for condensation control, and 4) High and dry - condensation in the roof, eaves to eaves ridge ventilation.

Air flow in dwelling houses from an energy point of view (Polish experience).

Reviews ways of reducing energy loss due to infiltration while maintaining air quality. Results from existing houses are presented. Describes a method to reduce the average air flow coefficients of the envelope to minimum required values and to determine the heat criteria of various ventilation systems.

Indoor air quality, infiltration and ventilation in residential buildings. Final report.

Sixty houses built with widely different construction practices and located in different areas in upstate New York were monitored for airtightness (using fan pressurization) and integrated radon concentrations in indoor air, household water,