Date post: | 13-Jan-2016 |
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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
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Acknowledgement
EECA Rotorua Energy Charitable
Trust
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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.
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Energy Grade Optimisation
Waste minimisation
Reuse
Recycling
Energy Recovery
Energy savings
Energy grade optimisation
Combined heat and power
Fuel switching
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Energy demand at schools
Electricity Space heating Water haeting
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Space heating profiles
Annual profile weekly Daily
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Energy use survey on Schools in Rotorua
27 schools Primary as well as secondary
schools Interview with each school Basic energy sue information
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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
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Fuels sources at the schools
ElectricityCoalGasGeotherm
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Heating costs related to type of fuel use
0.000
0.020
0.040
0.060
0.080
0.100
0.120
0.140
0.160
A B C D E F G H I J K L M N O P Q R S T U V W X U Z AA
School
HeatingEnergy
Cost($/kWh)
Elect / CoalElectricityGasCoalGeothermal
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Heating costs per student
$0
$5
$10
$15
$20
$25
$30
$35
$40
$45
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z AA
School
AnnualHeatingEnergy
Costper
Student
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regression
y = 4050.9x + 24873
025,000
50,000
75,000100,000
125,000150,000
0 5 10 15 20 25
Number of Class Rooms
kWh/year
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Energy PRO evaluation
Gas engine Boilers Heat consumption Heat blow off
Sun 02/06Sat 01/06Fri 31/05Thu 30/05Wed 29/05Tue 28/05Mon 27/05Sun 26/05
Heat [MW]
0.2
0.1
0
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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.
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Acknowledgement
EECA Rotorua Energy Charitable
Trust