Discusses the problems associated with poor air quality in tight buildings. Considers how problem conditions can be identified and evaluated, and gives some possible solutions to improving air quality. These include turning the thermostat down slightly, increasing ventilation levels, and ensuring that themechanical ventilation system is working properly, or calling in a specialist to identify the problem.
States that in localities which must be ventilated by law such as cinemas, restaurants and assembly rooms of various kinds the fresh air supply is often greatly in excess of what is strictly needed. This excess air has to be transported, and possibly heated, cooled, humidified and dehumidified. Describes how controlling the air quality makes it possible to restrict the quantity of fresh air to the basic requirements, thereby keeping ventilation heat losses to a minimum. The control variable is the room air quality as monitored by a sensor.
Describes the results of air tightness tests of various service penetrations through a polythene vapour barrier and associated insulation. The service penetrations studied were insulated and uninsulated ventilation ducts, plastics, pipes, electrical boxes and electrical conduits. Various methods of sealing the penetration were tested for each case. Recommendations are made for choice of sealing method based on performance and case of installation. Examples are given of the effect of leakage through service penetrations on total building leakage.
Parts 2 and 3 of a series of articles. Describes office buildings with natural and mechanical ventilation systems mentioned in part one, where the mechanical ventilation plus humidification and cooling is used only during the coldest parts of the winter and hottest parts of the summer. Provides comparative cost analysis for the building. Discusses design criteria to take account of fullor part time natural ventilation. Treats maximum room depths, window types,external and internal doors, furniture, room layouts.
Describes a simple device developed in the Institute for Applied Physics which is suitable for frrsh air control in air conditioned spaces. The protype instrument detects the amount of CO2 in the atmosphere on the basis of photoacoustics. Illustrates the device schematically and explains its operation.
The report aims to provide the basis for the design and set up of experiments for the evaluation of the effects of energy conservation measures in residential buildings. The first part deals with general planning of the experiment, basic principles of building physics, thermal comfort and energy related behaviour of occupants. The second part decribes the design of the experiment, and the third part is devoted to measurement techniques, data acquisition and installation rules in the different fields of building physics and heating systems.
Uses model buildings to study external distribution of wind pressure and internal air flow. Compares air flow data with computed values derived from the pressure distribution data. Collects the pressure data obtained in a comprehensive study of wind loads on low-rise buildings and rearranges it in a form more suited to the computation of internal flows. Presents and discusses the methods emloyed in the reformulation and the results obtained. Briefly describes the development of design aids from which flow estimates could be made by simple hand calculations.
Describes energy measurements carried out on 6 detached single family low-energy houses in Hjortekaer, 1979-1980. Discusses a few typical construction details, to illustrate solutions to the problem of cold bridges and to demonstrate ways of obtaining air tight constructions. Measures the achby the tracer gas decay method, showing results ranging from 0.02-0.12 ach. Correlates these with pressurization tests also made. By means of regression analysis of thermal calibration data tests 3 different models for heat loss equations.
The estimation of the average wind pressures on buildings can be made via wind tunnel measurements. Carries out measurements on 5 models of buildings under various conditions. With the aid of these results and some interpolation, makes a prediction of the average wind pressure for a large number of buildings. Includes studies of the effects on the pressure caused by another building upwind.
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