Retrofitting halves school's heating bill.

The Jandel school in southern Sweden was thoroughly retrofitted in 1994-95. Both lighting and ventilation systems have been designed for high energy efficiency. New windows with excellent insulating performance have been installed. A before and after comparison shows that the energy required for heating has been reduced from about 210 k Wh/m2 to about 94 k Whlm2 a year, i.e. a reduction of about 55%. Electricity for building services systems has decreased by about 20%, despite the fact that considerably more computers are used in the school today than prior to rebuilding.

Condensing boilers in local authority family housing.

            

Condensing boilers in smaller homes.

This demonstration hosted by the Vale of White Horse District Council at Drayton, Oxfordshire, examined the type of building and occupancy pattern most likely to benefit from the installation of the current range of gas-fired condensing boilers. Specifically, the aims of the project were to examine the variations in space heating and domestic hot water load and the effect of building fabric insulation on these loads.

How feasible are zero energy buildings?

In the discussion on practice-oriented measures to reduce the CO2 emission, one measure most demanded is the development of zero heating energy houses. The technology applied and investigated in the first pilot projects seems to indicate a possible future without any CO2 emission with respect to residential building. What is really hidden behind this technology and whether it is feasible to introduce it into construction practice, is to be discussed in this contribution with regard to practical experiences.

The advanced combustion woodburning fireplace. An alternative efficient residential heating system.

 Fireplaces have occupied an important place in North American households for more than 400 years. They have acted as a place where the food was cooked, where people gathered around to talk at the end of the day and hopefully, where they could get warm. Even today, builders find it difficult to sell a new house which does not have a fireplace. However, housing characteristics have changed remarkably, particularly over the last 25 years.

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