Unit AS 2: Renewable Energy Technologies — Desktop Research
Welcome to your study guide for Desktop Research in CCEA GCE Environmental Technology (Unit AS 2). Desktop research is the foundational stage of your AS 2 Internal Assessment portfolio. In this stage, you gather, analyze, and evaluate secondary data to recommend the best renewable energy solution for a specific client scenario. Don't worry if this seems like a lot of information to balance at first—breaking your research down into structured steps makes the task completely manageable!
Unit AS 2 Snapshot:
• Assessment Weighting: 50% of your AS Level (25% of your total A Level).
• Assessment Format: Internal Assessment / Coursework Portfolio (marked by your centre and externally moderated by CCEA).
• Your Goal in Desktop Research: Investigate secondary sources across Wind, Solar (PV & Thermal), and Biomass technologies, evaluating each against technical, environmental, and economic criteria for a designated scenario.
What is Desktop Research?
Desktop research (also known as secondary research) involves collecting and analyzing data that has already been published. Instead of going outside with an anemometer or installing solar test rigs yourself (which would be primary fieldwork), you will review manufacturer datasheets, government statistics, technical reports, and energy databases from your desk.
Think of it like being a renewable energy consultant: Before you recommend spending tens of thousands of pounds on equipment, you must gather solid technical facts, economic data, and environmental evidence to prove your proposal is viable.
Key Takeaway: Desktop research is not just copying descriptions from websites; it is the systematic collection and critical evaluation of secondary evidence tailored directly to your project scenario.
The Three Core Renewable Technologies
Under the CCEA AS 2 specification, your desktop research must thoroughly examine three primary renewable energy technologies:
1. Wind Energy
• Involves harnessing kinetic energy from wind using wind turbines (small-to-medium scale domestic or commercial systems depending on the scenario).
• Requires secondary research on local mean wind speeds, hub heights, cut-in and cut-out speeds, and rotor diameters.
2. Solar Energy
Your research must distinguish between two distinct solar technologies:
• Solar Photovoltaic (PV): Semiconductor panels that convert solar irradiance directly into electricity.
• Solar Thermal: Solar collectors (e.g., evacuated tubes or flat plate collectors) that absorb solar radiation to heat water or fluid for space and water heating.
3. Biomass Energy
• Involves biological material (such as wood pellets, wood chips, or logs) burned in automated or manual biomass boilers to generate thermal energy.
• Requires research into boiler efficiencies, fuel delivery logistics, fuel storage footprints, and continuous operational feedstock requirements.
Key Takeaway: Ensure your research explicitly covers Wind, Solar (both PV and Thermal), and Biomass. Neglecting any of these three technologies leaves an incomplete portfolio.
The Three Pillars of Evaluation: Technical, Environmental, and Economic
For each of the three technologies, your desktop research must provide a balanced, detailed appraisal across three essential pillars. A handy way to remember this is the T-E-E Framework: Technical, Environmental, Economic.
1. Technical Feasibility
Technical feasibility assesses whether the technology can physically and practically meet the energy demands of the given scenario site.
• Hardware & System Specifications: Rated power output (e.g., in \(\text{kW}\) or \(\text{MW}\)), system dimensions, operating temperatures, and inverter/controller requirements.
• Resource Availability: Is there adequate annual solar irradiance, consistent mean wind speed (e.g., in \(\text{m/s}\)), or a local supply chain for biomass fuel?
• Capacity Factor & Intermittency: The ratio of actual energy produced over time compared to the maximum theoretical output at continuous full nameplate capacity.
• Site Constraints: Roof pitch, orientation (aspect), structural load-bearing capacity, shading, physical space for fuel hoppers/storage, and ground access.
2. Environmental Impact
Renewable technologies are adopted to improve sustainability, but every technology has positive and negative environmental implications that you must evaluate.
• Carbon Savings: Lifecycle greenhouse gas emissions reductions, quantified as equivalent carbon dioxide savings (\(\text{CO}_2\text{e}\)).
• Biodiversity & Ecology: Potential impacts on local wildlife (e.g., bird and bat collision risks with wind turbine blades).
• Noise & Vibration: Acoustic emissions from turbine gearboxes/aerodynamic blade swish or biomass boiler delivery/combustion machinery.
• Visual Amenity: Landscape changes, glint and glare from solar PV panels, or the visual profile of turbine towers and exhaust flues.
• Site Disruption: Groundworks, access road requirements, trenching for cables or district heating pipes.
3. Economic Feasibility
A solution must be financially justifiable for the client. Your desktop research must gather authentic financial values and data.
• Capital Expenditure (CAPEX): The upfront purchase, installation, civil works, and grid-connection costs of the equipment.
• Operational Expenditure (OPEX): The recurring annual costs, including maintenance, servicing, insurance, parts replacement (e.g., inverter replacement after 10–12 years), and biomass feedstock purchasing.
• Government Incentives & Tariffs: Applicable support mechanisms, export tariffs, or financial schemes available in the region.
• Simple Payback Period: The estimated time in years required for the cumulative operational energy savings and revenue to equal the initial CAPEX:
\(\text{Simple Payback Period (years)} = \frac{\text{Total Initial Capital Cost (CAPEX)}}{\text{Annual Net Financial Savings / Earnings}}\)
Key Takeaway: High-scoring portfolios do not rely on vague descriptions like "Solar is cheap and green". Instead, they present real figures: equipment ratings (\(\text{kW}\)), carbon offset data (\(\text{kg CO}_2\text{e}\)), upfront capital costs (\(\text{£}\)), and calculated payback periods (\(\text{years}\)).
Structuring Your Desktop Research Report
To meet professional engineering standards, CCEA requires your portfolio to follow a clear, structured technical report format. Your desktop research section should contain the following core components:
1. Formal Headings & Sub-sections: Clear, numbered headings that separate the introduction, individual technology reviews, comparative analysis, and final recommendations.
2. Executive Summary / Introduction: A brief synopsis outlining the scenario, client requirements (power/heat load), and the scope of technologies investigated.
3. Structured Technology Appraisals: Dedicated sections for Wind, Solar (PV & Thermal), and Biomass, each methodically broken down by Technical, Environmental, and Economic factors.
4. Comparative Evaluation Matrix (Decision Matrix): A structured comparison table placing all three technologies side-by-side against uniform scoring criteria (e.g., CAPEX, space requirements, \(\text{CO}_2\text{e}\) savings, resource reliability). This serves as the objective justification for your final recommendation.
5. Academic Referencing & Bibliography: Full documentation of all sources using the Harvard Referencing System.
6. Appendices: Supplementary material, such as manufacturer specification cut-sheets, wind resource maps, or detailed calculation breakdowns.
The Comparative Decision Matrix
The comparative matrix is the bridge between your desktop research and your final recommendation. It proves to the examiner that your final system choice is backed by evidence rather than guesswork.
Example Matrix Structure:
• Evaluation Criteria: Initial CAPEX (\(\text{£}\)), Fuel/Running Costs (\(\text{OPEX}\)), Space Requirement, Planning/Environmental Constraints, \(\text{CO}_2\text{e}\) Reduction Potential, Suitability for Scenario.
• Columns: Wind Energy | Solar PV | Solar Thermal | Biomass Energy.
• Score/Assessment: Quantitative values alongside qualitative rankings (e.g., Low / Medium / High suitability) with brief justification statements.
Referencing Standards: Using the Harvard System
Every piece of data, cost estimate, efficiency curve, and technical figure in your desktop research must be attributed to a credible secondary source. Plagiarism or unreferenced claims will cost you significant marks in the research and communication assessment criteria.
In-text Citation Example:
"Modern multi-crystalline solar PV modules typically achieve commercial efficiencies between 15% and 20% under Standard Test Conditions (STC) (Energy Saving Trust, 2022)."
Full Bibliography Entry Example:
Energy Saving Trust (2022) Solar panels guide: costs, savings and energy generation. Available at: https://energysavingtrust.org.uk/advice/solar-panels/ (Accessed: 14 October 2023).
Memory Tip: If you quote a number (a cost, an efficiency percentage, an emissions factor, or a wind speed), ask yourself: "Have I cited where this number came from?"
Common Pitfalls to Avoid (Examiner-Reported Concerns)
Pitfall 1: Generic 'Copy-Paste' Research
The Mistake: Providing generic descriptions explaining how a solar cell or wind turbine works without ever connecting the data to the client's scenario.
The Fix: Constantly relate your findings back to the site. For example: "While a \(6\text{ kW}\) wind turbine produces substantial power, the site's close proximity to neighboring boundaries and local trees creates turbulence and potential acoustic disruption, reducing its feasibility."
Pitfall 2: Omitting Concrete Financial Calculations
The Mistake: Stating that biomass or solar PV is "cost-effective" without providing actual estimates for CAPEX, recurring fuel/maintenance OPEX, or payback periods.
The Fix: Include realistic equipment quotes and calculate simple payback periods using the formula provided above.
Pitfall 3: Ignoring Negative Impacts and Limitations
The Mistake: Writing an entirely one-sided promotion of a technology while ignoring intermittency, visual impact, noise, planning constraints, or maintenance demands.
The Fix: Present a balanced engineering evaluation. Acknowledging that solar PV produces minimal energy during winter peak demand demonstrates critical thinking.
Pitfall 4: Incomplete or Missing Referencing
The Mistake: Relying on raw URLs pasted at the end of the document without formal Harvard formatting.
The Fix: Maintain an organized record of all secondary sources throughout your research and format them strictly according to Harvard conventions in your bibliography.
Quick Review Checklist
Before submitting your Desktop Research component of Unit AS 2, verify that you have:
• Evaluated Wind, Solar (PV and Thermal), and Biomass technologies.
• Assessed every technology through the Technical, Environmental, and Economic pillars.
• Included authentic data: equipment ratings (\(\text{kW}\)), emissions data (\(\text{CO}_2\text{e}\)), and financial costs (\(\text{CAPEX}\), \(\text{OPEX}\), payback period).
• Applied all research directly to the constraints and energy demands of the assigned scenario.
• Constructed a clear Comparative Decision Matrix summarizing your findings.
• Formatted all in-text citations and the final bibliography using standard Harvard referencing.