The observed dynamic thermal response of intermittently occupied buildings can usually be described by one or two time constants. This suggests that much of the complexity in detailed computer thermal response models may not always be necessary. Simplified thermal response models may be adequate for many purposes, and ought to have cost advantages, both in setting up and run time. The paper describes the basis of a simplified microcomputer model of building thermal response. Model predictions of internal temperature variation in a working school are shown to agree well with observations. The model is intended for professional use and user interface is being developed in consultation with an architectural practice.

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A number of commercially promoted boiler economy devices have been tested for their effect on the operation of a twin boiler system in a working primary school. Both boiler efficiency and site gas usage were measured. It was found that most of the devices had no effect on either aspect of performance. The only device to produce measurable reductions in gas usage and an increase in boiler efficiency appeared to achieve this by effecting unacceptable reductions in average boiler temperature.

A magnetic device claimed to improve the efficiency of heating boilers when attached to the fuel line has been tested on a working boiler installation. Tests conducted with the agreement and cooperation of the manufacturer and distributor failed to show any significant effect on efficiency.