Vimal Bhana, Technical Director of Self Energy UK, recently gave
a presentation on CHP at CIBSE, which is a nice summary of issues.
Buildings particularly well suited to CHP are: hospitals, hotels, swimming pools, leisure centres and universities. In all cases, the criteria for good quality CHP are: a year round demand for heat; the primary source of heat being the CHP system with backup boilers only supplying any remaining heat demand; and the CHP should run for a large proportion of the time so it is economically feasible.
There are numerous examples of successful CHP installations that have achieved excellent cost and CO2 savings. Liverpool University connected a 3.6MWe CHP system to 30 of its buildings in 1986 at a cost of £2.1M. They achieved savings of £416,000 each year which resulted in a payback of 5 years. Marriott Hotels have made 23 CHP installations since 1993 and are saving over £550,000 each year. Queens Medical Centre in Nottingham installed a 4.9MWe gas turbine in 1998 under an energy services contract and is saving £350,000 annually.