English

The proceedings of the Canada Mortgage and Housing Corporation industry/science seminar "Controlled Ventilation with Exhaust Air Heat Recovery for Canadian Housing" 26 October 1978

Briefly describes a heat exchanger designed for use in a tight, solar heated house. The exchanger consists of three 3in. galvanized steel ducts within an 8in. galvanized steel duct. The ducts can be assembled in any length - 33 ft. was used in Provident House, giving a theoretical effectiveness of 33%.

Reports the development of a small air-to-air rotary heat exchanger for residential applications in progress at Ontario Hydro Ltd. A prototype has been constructed and tested. Gives results of performance tests and the results of a numerical model for the solution of heat transfer equations as related to the prototype performance. States exchanger will be installed in aHUDAC conservation house.

A model that relates fan pressurization results to infiltration values during the heating season is the basis for infiltration estimates in several different audit programs. Describes the model and presents validation results. The model is used in three different audit strategies. The first is an energy audit to determine economically optimal retrofits for residential buildings, based on actual on-site measurements of key indices of the house.

Describes a covariance integration method for the determination of fluctuating overall structural loads due to wind and their effects on low rise buildings. The required aerodynamic information can be obtained from boundary-layer wind tunnel tests: static structural influence coefficients are also required. Themethod is an alternative to the direct on-line weighting technique, but is less demanding on wind tunnel instrumentation and data acquisition facilities. To obtain peak values, Gaussian probability distributions have been assumedfor the loads or their effects.

Gives a brief historical review of the development of wind engineering as a discipline. Discusses the simulation of wind loads on buildings, the development of boundary layer wind tunnels and problems in modelling the natural wind. Describes modelling of the aerolastic behaviour of buildings andof stack gas diffusion. Describes instrumentation and measurement techniques. Indicates areas requiring further development.

Describes a mechanically ventilated roof structure serving several different purposes. The proposed roof design consists of a hollow beam structure of concrete, insulation, air gap and finally an outer cladding layer of metal sheet or roofing felt. When the air handling equipment is in operation, an airflow is set up through the roof airgap and hollow beam structure, consisting either of external air alone, or of alternating external and exhaust air. This enables:<

Presents an evaluation of three proposals for the town plan for the Bulltofta district in Malmo in relation to the wind-induced energy losses. Analyses the wind statistics for the particular region and assesses the effects on energy consumption of winds from different directions. Evaluates the suitability of the various town plan proposals in relation to particular high energy loss inducing winds, making allowance for the overall exposure to sun and wind, the surface/volume ratio, building density and building heights.

Presents a review of the literature and a survey of the various types of window insulation systems and methods which are available, together with notes on experience of their use. The potentials of selective coatings on glass are discussed and comparisons between triple-glazed windows and window insulation are presented.< The survey serves as a feasability study for a larger project of which the object is to investigate the size of the savings which are possible with insulation of windows under varying conditions.

Reports an investigation of the effects of temperature differences, pressures, sun and wind conditions on a thermal image produced by thermography. This investigation is concerned mainly with measurement points associated with air leakage. Reports measurements on a single-storey timber-framed house under a pressure difference of 5,-2,-10 and -20 Pa.