heat exchanger

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.

After a general preliminary discussion of the meaning of "heat recovery" and possible systems for carrying it out, the author examines the possible different ways of transferring thermal energy from one fluid to another by means of an indirect heat exchanger. Air-to-air systems are in particular analyzed, examining the operating features of the various exchange types(rotating, fixed plate, multiple tower and finned tube exchangers). The paper concludes with a series of considerations on both energetic and economic aspects of thermal energy recovery.

A market review of inlet/exhaust ventilation with heat recovery in single family houses. Traces recent developments in new house production. Tabulates review on several criteria including manufacturer, type, flow rate, frost protection, position of heat exchanger, type approval. Review covers over 40,000 units installed.

Presents diagrams showing the behaviour of air currents in two passive solar houses. Suggests some straightforward means by which repetitive patterns of discrete currents can be engineered. An appendix briefly outlines the operation of a discrete current flat plate collector with a 65 - 75% normal winter efficiency.

Describes the use of mechanical ventilation coupled with heat recovery devices in residential buildings to maintain acceptable indoor air quality and conserve energy. Gives tables showing the energy saving possible with a heat exchanger.

An air to air heat exchanger is only of value if one can control the movement of air into and out of the house. Suggests measures for reducing air leakage. describes construction of an air to air heat exchanger. Finds that heat exchanger can be used to control humidity in houses. Suggests use of a solar collector to preheat the cold outside air entering the heat exchanger.

Discusses the problem of increased levels of indoor air pollution due to reduced ventilation. Suggests ways of lowering pollutant concentrations without compromising energy conservation. One promising method is to mechanically ventilate a residence and recover heat from the exhausted air with an air-to-air heat exchanger.

Gives instructions for constructing a super-insulated house. Describes installing insulation, vapour barriers, shutters and an air-to-air heat exchangers. Outlines ways in which heat islost from a house and the problems of conventional structures.

Suggests methods of conserving energy in new houses. Gives detailed instructions for installing vapour barrier; constructing double stud wall, insulating walls and windows. Also discusses moisture problems and the use of an air-to-air heat exchanger. Outlines other methods of saving energy and waysof refitting an older house.NOTES An updated second edition has been published as "Energy efficient housing - a prairie approach" abstract no.643.