Solar Energy Systems and Carbon Pricing

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Questions and Answers

What function does an expansion vessel serve in a water heating system?

  • It filters impurities from the water.
  • It helps to cool the water before it reaches the heater.
  • It accommodates the increased volume of water due to thermal expansion. (correct)
  • It enhances the heating efficiency of the water tank.

Which component is essential to prevent excessive pressure in a closed water heating system?

  • Expansion tank (correct)
  • Solar tracking system
  • Thermal energy storage
  • Electrical generator

What happens to the volume of water in a solar storage tank as it is heated?

  • It expands, causing potential pressure increase. (correct)
  • It converts into steam and loses volume.
  • It decreases due to evaporation.
  • It remains constant regardless of temperature.

Which of the following components is not typically associated with a hybrid solar trough power plant?

<p>Ammonia-water pump (A)</p> Signup and view all the answers

What is the role of a solar superheater in a solar power system?

<p>To increase the temperature of the heat transfer fluid. (A)</p> Signup and view all the answers

Which solar thermal collector type operates at the highest temperature range?

<p>Parabolic dish (C)</p> Signup and view all the answers

What is the maximum efficiency of flat plate solar collectors?

<p>40-50% (C)</p> Signup and view all the answers

Which component is NOT part of the heat engine system for solar power generation?

<p>Heat inverter (D)</p> Signup and view all the answers

In which temperature range do compound parabolic collectors typically operate?

<p>100-250^oC (D)</p> Signup and view all the answers

What is the purpose of the desorber in a solar heat engine?

<p>To release heat for power generation (D)</p> Signup and view all the answers

Which type of collector has the lowest maximum efficiency?

<p>Flat plate collectors (B)</p> Signup and view all the answers

Which solar thermal collector type is characterized by a concentration ratio (C) of $100-500$?

<p>Parabolic solar tower (B)</p> Signup and view all the answers

Which type of collector is best suited for applications requiring temperatures up to $800^oC$?

<p>Parabolic solar tower (A)</p> Signup and view all the answers

Which statement describes the function of the expander in a solar heat engine?

<p>It expands working fluid to generate power (B)</p> Signup and view all the answers

What is the efficiency range typically achieved by parabolic dish collectors?

<p>70-90% (C)</p> Signup and view all the answers

Flashcards

Expansion vessel (tank)

A tank that accommodates the expansion of heated water in a closed system, preventing excessive pressure buildup.

Thermal expansion

Increase in volume of water as it gets heated.

Pressure in plumbing system

The force exerted by water within the pipes.

Closed water heating system

A system where water is contained and pressure controlled to prevent leaks or damage.

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80-gallon tank expansion

A 80-gallon tank's heated water can expand by 2.5 gallons, causing a significant pressure increase.

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Solar Thermal Collectors

Devices that capture solar energy and convert it into heat for various applications, like heating water or buildings.

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Concentrating Collectors

Solar thermal collectors that use mirrors or lenses to focus sunlight onto a smaller area, increasing the heat intensity.

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Non-Concentrating Collectors

Solar thermal collectors that don't concentrate sunlight, instead absorbing it over a larger surface area.

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Flat Plate Collectors

A type of non-concentrating collector with a flat panel that absorbs solar energy and heats water or air flowing through it.

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Evacuated Tube Collectors

Non-concentrating collectors with glass tubes that create a vacuum, improving heat retention and efficiency.

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Compound Parabolic Concentrators (CPC)

A type of concentrating collector with a parabolic shape that efficiently captures and focuses sunlight.

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Parabolic Dish Collectors

Concentrating collectors with a parabolic dish shape that focuses sunlight onto a receiver at the focal point, achieving very high temperatures.

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Solar Tower Collectors

Large-scale concentrating collectors using mirrors to reflect sunlight onto a central receiver high on a tower.

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Solar Heat Engine

A system that uses the heat generated by solar collectors to produce power.

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Resorber

A component in a solar heat engine responsible for absorbing heat from a working fluid, transferring it for use.

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Study Notes

Solar Energy Systems

  • Solar energy systems are a key component of energy systems.
  • Solar technologies cover various solar energy systems, including solar PV and PV/T systems, along with energy and exergy aspects, case studies, and closing remarks.
  • The outline also includes topics on solar radiation and solar energy applications.

Carbon Tax

  • A carbon tax is implemented in two regions.
  • The tax rate is $65 starting from 2023.

Cap and Trade

  • Cap and trade is implemented in two regions.
  • The average price of the credit on auction is $36.

Global Carbon Prices

  • A map displays global carbon prices (as of January 30, 2024).
    • Examples of specific regions and their prices include: European Union (€63.01), South Korea ($6.70), United Kingdom (£33.05), China ($9.80), California ($28.66), and New Zealand ($71.45).

100% Canada

  • The initiative aims to transition to 100% wind, water, and solar (WWS) energy.
  • Avoided mortality and illness cost is $107B per year, representing 4% of GDP.
  • The benefits of the transition include reduced air pollution deaths (9,598 annually) and a return on investment in as little as 1.9 years through savings from air and climate costs.

Solar Data Measurements

  • Pyrheliometers measure direct solar irradiance across a 300-4000nm range at normal incidence, possessing high accuracy and stability.
  • Pyranometers measure both direct and diffuse solar radiation, generating a proportional response to sunlight intensity, correlating linearly to the angle between the sun's rays and vertical.

Photovoltaic Systems

  • Photovoltaic (PV) systems encompass PV and PV/T (photovoltaic thermal) systems.
  • Potential applications include space applications, stand-alone systems, grid-connected systems, hydrogen production, and others.

Solar Heat Engine

  • Solar heat engine systems utilize components like solar collectors, concentrators, receivers, expanders, resorbers, ammonia-water pumps, electrical generators, solar tracking systems, inverters, and warm water storage.

Solar Thermal Collectors

  • Classifies solar thermal collectors as non-concentrating (flat-plate collectors) and concentrating (compound parabolic, parabolic trough, solar tower, and parabolic dish) based on their design characteristics.
  • Reports specific temperatures (T values) and efficiencies (η) for each type of collector.

PV-Electrolyzer Hydrogen Production Systems

  • This system involves photovoltaic panels generating electricity which in turn is used by an electrolyzer to split water into hydrogen and oxygen.

Roof-top mounted transparent PV panels

  • Transparent PV panels are mounted on rooftops for electricity generation.

Greenhouse with transparent PV panel mounted on roof

  • A typical greenhouse setup now includes transparent solar panels on the roof to generate electricity while also supporting crop growth.

Hybrid PV Solar Water Heater and Active Solar Still

  • Hybrid PV solar systems combine photovoltaic panels and flat plate collectors to heat water efficiently, with the setup being described as a hybrid PV-solar collector active solar still.

Photovoltaic Thermal (PV/T) System Applications

  • PV/T systems are applied in air collectors, water collectors, and others.

Energy and Exergy Aspects

  • Key formulas for calculating power (Ee = Pm = Vm Im = FF Voc Isc) and efficiency are included, referencing variables like FF, Voc, and Isc.
  • The relationships between cell current, A and cell voltage, V, and different illumination levels are presented graphically.

Energy and Exergy Efficiencies of PV and PV/T Systems

  • Formulas for calculating energy and exergy efficiencies for PV and PV/T (photovoltaic/thermal) systems are detailed, including variables like Ee, Qs, Pm, and Qout.

Best Research-Cell Efficiencies

  • A timeline graph depicts the increasing trend in solar cell efficiencies from 1975 to present.
  • Various solar cell types, such as III-V multijunction cells, single-junction GaAs cells, and thin-film technologies, are included in the chart.

Case Studies

  • Different case studies cover diverse applications of solar technology. Diagrams illustrating the technologies are presented.

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