Energy demand analysis for small and medium scale heat users in Rotorua aiming at converting existing heating systems to bioenergy Dr Per S. Nielsen, Mr. G. Estcourt, Mr. M. Shepherd

Image goes here Acknowledgement  EECA  Rotorua Energy Charitable Trust

Image goes here Introduction  Evaluation of heat demand at school in Rotorua  The driver for us has been to evaluate the long term competitiveness of wood pellet heating systems.

Image goes here Energy Grade Optimisation

Image goes here Energy demand at schools  Electricity  Space heating  Water haeting

Image goes here Space heating profiles  Annual profile  weekly  Daily

Image goes here Energy use survey on Schools in Rotorua  27 schools  Primary as well as secondary schools  Interview with each school  Basic energy sue information

Image goes here Results  40-45% of energy use is relate4d to space haeting  45% of the schools use coal as the main fuel source for sapce heating in old buildings  In prefabs electricity is used for heating

Image goes here Fuels sources at the schools

Image goes here Heating costs related to type of fuel use

Image goes here Heating costs per student

Image goes here regression kWh/year

Image goes here Energy PRO evaluation

Image goes here Conclusions  45% of the schools have a coal boiler, which heats the part of the school (more than 20 years old).  In new buildings electricity heaters are the preferred solution.  On fuel costs alone, a wood pellet cost of 6c/kWh will be competitive with the school on electricity and electricity/coal and comparable to natural gas, but not competitive to the schools using coal.

Image goes here Acknowledgement  EECA  Rotorua Energy Charitable Trust