Energy demand analysis for small and medium scale heat users in Rotorua aiming at converting...
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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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Transcript of Energy demand analysis for small and medium scale heat users in Rotorua aiming at converting...
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
