1. Feasibility study of renewable energy & energy efficiency measures
for the new science block at St. Chrispin’s school, Wokingham
Nikos Anastasiadis
School of Construction Management and Engineering
• Scenario A: Similar technology with the existing system used for all
scenario A simulation. SMA inverter along with Sun tech solar panel
compared for different system size and directions. In this scenario the
existing system detail also included (zone A, figure 1)
• Scenario B & C: Inverter type remained the same (SMA) .The PV panels
changed from Sun Tech technology to Yingli (Sc B) and SunPower
(Sc C)
• Scenario D & E: Yingli panels were used in all the simulation combined
with different inverter types. KACO ( Sc D) and Power One (Sc E)
inverters were used in the simulations
Except the energy performance and emission reduction analysis
an economic evaluation for the technology combinations
occurred in the study coupled with the socioeconomic benefits
that are pouring for a PV system installed in the new science
block roof
Proposed system analysis
The best system from the previous analysis investigated in
detail including among other electrical layout analysis, energy
yield and economic evaluation of the system. Figure 3 illustrates
the payback time and the investment profit. The system’s total
profit at the end of its lifetime (20 years)comes to £26,505.21
with the total investment cost measured to be £40,658.480
Introduction
The new science block constructed in 2012 as part of St.
Chrispin's School ,consist of two storeys with 9
laboratories used in daily basis. In 2012 a photovoltaic
(PV) system of 9.6 kW capacity installed in the building’s
roof without put into use. Now, the Wokingham council
wants to expand the existing system gaining the FITs
profit and at the same time benefit the new science block
in various ways
Objectives
• Investigate the potential for existing system extension
• To investigate the effectiveness of comparing technology
combinations ( panel, inverter) for a number of scenarios
• To perform detailed analysis of the proposed system
• Indentify potential educational benefits
• Measure the energy performance of the new science
block
• Implement a green roof as energy efficient measure in the
site
Technology comparison
The roof was sectioned into possible installation zones.
Five (5) scenarios were developed to explore different
technology combinations for the available installation
zones with the assistance of PVsyst software
( pvsystem.com, 2015)
Energy efficiency analysis
The materials cost (SPON’s, 2013) and their thermal
performance presented in the study. The building’s layout
modelled and simulated in IES software (Iesve.com, 2015)
with the aim to calculate itsenergy performance. A green
roof implementation discussed and investigated. The
improved energy results from the green roof analysis
summarized in order to clarify the benefits gained from a
potential green roof implementation on the site ( figure 4)
Figure 4: The IES model of the new science block along with green roof implementation presented in figure 4. The green roof
proven beneficial as the energy consumption of the building reduced from 181.3MWh per year to 173.6MWh along with
emission cuts.
References
1. Iesve.com, (2015). Integrated Environmental Solutions. [online] Available at:
http://www.iesve.com [Accessed 5 Jul. 2015].
2. Sketchup.com, (2015). 3D for Everyone | Sketch Up. [online] Available at:
http://www.sketchup.com/ [Accessed 12 Jul. 2015].
3. D. Langdon 2013, SPON’s Architect’s and builder’s price book 138th ed., p. 280, 499,
305, 456, 393, 443,392, 368, 443, 368, 499, 384, 410 ,545, 559 Abingdon: Spon Press
4. Pvsyst.com, (2015). Home. [online] Available at: http://www.pvsyst.com/en/
[Accessed 10 Jul. 2015].
Acknowledgements
• Dr Emmanuel Essah, for the help and guidance provided.
• My family , making this master a reality.
Results
• Determination of the best technology choice to be SMA
inverter combined with Yingli panels, presented in scenario B
• The proposed system energy performance identification,
generating 15,522 kWh/year and reduce greenhouse gas
emissions 164.6 tCO2 throughout its life time (20 years)
• Clarify and take advantage of the potential educational
opportunities by developing an education PV system
• Analyse the new science block’s material and calculate the
energy performance of the building as presented in figure 4
• Investigate a green roof implementation as an efficient
improvement measure. Analyse the impact that the green
roof have on the building energy performance as presented
in figure 4
Contact information
• School of Construction Management and Engineering, University of Reading, Whiteknights,
RG6 6AH
• Email: md849347@reading.ac.uk
• www.reading.ac.uk/cme
Figure 2: Energy generation of the potential systems. The results are in line with the emission reduction cut
( figure 1). Zone 3 in scenario B in the best system to be installed in terms of energy yield.
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kWh/year
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Scenario B
Scenario C
Scenario A
Scenario D
Scenario E
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Investment payback
Figure 3: Investment profit and payback time. The investment start profit at 12 years as shown in the figure.
Educational tool
The potential educational benefits from the PV system
was investigated in this study. An educational PV
system has been proposed after it was modelled using
Google Sketch-up software (Sketch up,2015). The
educational opportunities obtained from the system is
discussed and analyzed with details and presented in
the dissertation
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tCO2
Zones
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Scenario C
Scenario A
Scenario D
Scenario E
Figure 1: The tones of carbon dioxide presented in this figure for available installation
zones and scenarios. Best zone to install a PV system in terms of emission reduction is
zone 3 with scenario’s B system to be the optimum choice.