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Solar Thermal Energy Systems

Exploring the efficiency of Seasonal Thermal Energy Storage (STES) systems and solar thermal technologies, this text delves into various applications such as centralized solar district heating, interseasonal and short-term thermal storage, solar cooling, and high-temperature solar collectors. It highlights innovative designs in solar energy collection and the importance of heat exchange in maximizing system performance for residential, commercial, and industrial use.

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1

STES is highly effective in areas with large ______ temperature differences.

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seasonal

2

STES technologies utilize ______, among other methods, to store thermal energy.

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aquifers borehole thermal energy storage insulated water tanks

3

The ______ in Alberta, Canada, is a prime example of STES, meeting 97% of its heating needs with solar energy.

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Drake Landing Solar Community

4

STES is crucial for ______ energy utilization throughout the year, especially for heating.

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solar

5

Key component of centralized solar district heating

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Concentrated solar thermal (CST) plants capture/store solar energy in thermal reservoirs.

6

Economies of scale in centralized solar heating

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Large-scale solar collectors reduce cost per unit, making heating provision more efficient.

7

Thermal inertia's role in stable heat supply

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Thermal storage maintains heat during low solar irradiance, ensuring consistent heating.

8

Heat can be preserved for months using ______, underground ______, and ______ tanks.

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aquifers pits insulated

9

______ thermal storage utilizes materials like ______, ______, and ______ due to their high thermal mass.

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Short-term stone concrete water

10

Incorporating materials with high thermal mass into ______ design aids in ______ solar heating and enhances energy ______.

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building passive efficiency

11

Solar cooling tech sustainability

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Solar cooling technologies offer eco-friendly alternatives to traditional cooling systems by using renewable solar energy.

12

Economic and climatic challenges

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Solar cooling technologies face economic barriers and climate-dependent efficiency, affecting their widespread adoption.

13

IEA Solar Heating and Cooling program role

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The program supports solar cooling tech research, promoting development and deployment of these sustainable systems.

14

______ heating systems fulfill the substantial thermal energy needs of ______ and ______ uses.

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Solar process industrial commercial

15

Technologies such as ______ ______ collectors, - collectors, and ______ ______ are used for industrial tasks like drying crops, warming air for ventilation, and producing steam for processes.

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unglazed transpired flat-plate parabolic troughs

16

Solar thermal energy in wood drying

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Used for sustainable drying of wood, replacing conventional fuel-based dryers.

17

Benefits of solar cookers

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Reduce reliance on traditional fuels, mitigate indoor air pollution.

18

Solar autoclaves purpose

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Provide sterilization solutions in remote, off-grid areas.

19

The ______ and ______ are examples of CSP plants showcasing the technology's scalability and potential.

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Ivanpah Solar Power Facility Solar Energy Generating Systems (SEGS)

20

CSP plants often feature ______ to ensure steady electricity production, even when direct sunlight is unavailable.

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thermal energy storage

21

CSP technology is lauded for its large-scale ______ storage capacity and the provision of a reliable, ______.

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thermal energy low-environmental-impact power supply

22

Advantages of power towers

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Achieve high temperatures and efficiencies; suitable for utility-scale power generation.

23

Characteristics of dish Stirling systems

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Modular and scalable; use mirrors to focus sunlight on receiver attached to Stirling engine.

24

Goals of solar thermal R&D

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Reduce costs; enhance performance; increase accessibility and market competitiveness.

25

Materials like ______ are used in heat exchangers due to their high ______ and ______ resistance.

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copper thermal conductivity corrosion

26

The ______ effect is utilized in solar thermal systems to enhance ______.

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greenhouse heat gain

27

In solar thermal systems, heat transfer occurs through ______, ______, and ______.

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conduction convection radiation

28

To reduce energy losses, it is crucial to properly ______ the ______ and ______ mechanisms in solar thermal systems.

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insulate storage transport

29

Solar thermal technology is versatile, addressing heating and cooling needs in various ______ due to its different system ______.

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sectors configurations

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Seasonal Thermal Energy Storage (STES) Systems

Seasonal Thermal Energy Storage (STES) systems are a collection of technologies that store thermal energy on a seasonal basis, allowing for the capture of heat during warmer months for use during colder periods. These systems are particularly effective in regions with significant seasonal temperature variations and are instrumental in harnessing solar energy for year-round heating. STES technologies include the use of aquifers, borehole thermal energy storage, and insulated water tanks, among others. The Drake Landing Solar Community in Alberta, Canada, exemplifies the success of STES by providing 97% of the community's space heating needs from solar energy, demonstrating the viability and efficiency of these systems in residential applications.
Solar thermal power plant with reflective parabolic mirrors, dark central tubes and processing facilities in an arid landscape under a blue sky.

Centralized Solar District Heating

Centralized solar district heating systems utilize large-scale solar collectors and thermal storage to provide heating to multiple buildings within a district. These systems benefit from economies of scale and can efficiently manage the distribution of heat through a centralized network. Concentrated solar thermal (CST) plants are a key component of such systems, capturing and storing solar energy in thermal reservoirs for later use. This approach ensures a stable and sustainable heating supply, even during times when solar irradiance is low, by leveraging the thermal inertia of the storage medium.

Interseasonal and Short-term Thermal Energy Storage

Interseasonal thermal energy storage is essential for mitigating the mismatch between the peak availability of solar energy and peak heating demand. This storage can be achieved through various methods, including the use of aquifers, underground pits, and insulated tanks, which can retain heat for several months. Short-term thermal storage, on the other hand, involves materials with high thermal mass, such as stone, concrete, and water, which absorb heat during the day and release it during cooler periods. The integration of these materials into building design is a strategic approach to passive solar heating, contributing to energy efficiency and thermal comfort.

Solar Cooling and Ventilation Technologies

Solar cooling technologies, including solar absorption and adsorption chillers, as well as solar-driven heat pumps, offer sustainable alternatives to conventional cooling systems. Despite economic and climatic limitations, these technologies are gaining traction, supported by research initiatives like the International Energy Agency's Solar Heating and Cooling program. Solar ventilation systems, such as solar chimneys, utilize passive solar design principles to enhance natural ventilation, reducing the need for mechanical cooling and improving indoor air quality.

Solar Process Heating and Medium-temperature Solar Collectors

Solar process heating systems are designed to meet the high thermal energy demands of industrial and commercial applications. Technologies such as unglazed transpired collectors, flat-plate collectors, and parabolic troughs are employed for tasks like drying agricultural products, preheating ventilation air, and generating process steam. Medium-temperature solar collectors, suitable for residential and commercial hot water production, are often incentivized through tax credits, which can improve their economic feasibility and accelerate their adoption.

Solar Thermal Applications in Drying, Cooking, and Distillation

Solar thermal energy is effectively used in drying processes for wood and food products, providing a sustainable and cost-efficient alternative to conventional fuel-based systems. Solar cookers, which harness sunlight for cooking and water pasteurization, are available in various designs, including box and parabolic cookers, and contribute to reducing reliance on traditional fuels and mitigating indoor air pollution. Solar distillation and solar autoclaves are other practical applications, providing clean drinking water and sterilization solutions in remote and off-grid areas, respectively.

High-temperature Solar Collectors and Concentrated Solar Power (CSP)

High-temperature solar collectors, integral to Concentrated Solar Power (CSP) systems, focus sunlight to achieve temperatures suitable for electricity generation. CSP plants, such as the Ivanpah Solar Power Facility and the Solar Energy Generating Systems (SEGS), demonstrate the scalability and potential of this technology. These plants often include thermal energy storage, enabling consistent electricity production regardless of solar availability. CSP technology is recognized for its ability to store large amounts of thermal energy and provide a reliable, low-environmental-impact power supply.

Innovative Designs in Solar Thermal Energy Collection

The field of solar thermal energy features a variety of innovative designs aimed at maximizing the collection and concentration of solar radiation. Parabolic troughs, central receiver systems (power towers), and dish Stirling engines are among the most prominent technologies. Each design has specific advantages, such as the high temperatures and efficiencies achieved by power towers, and the modularity and scalability of dish Stirling systems. Continuous research and development efforts focus on reducing costs and enhancing the performance of these technologies to make solar thermal energy more accessible and competitive.

Heat Collection and Exchange in Solar Thermal Systems

The efficiency of solar thermal systems is underpinned by the principles of heat collection, exchange, and storage. Heat exchangers, often made of materials like copper for its excellent thermal conductivity and corrosion resistance, are critical for transferring thermal energy within these systems. The greenhouse effect is exploited for heat gain, while heat transfer is facilitated through conduction, convection, and radiation. Proper insulation of storage and transport mechanisms is essential to minimize energy losses. These principles are applied in various system configurations to address the diverse heating and cooling needs across different sectors, showcasing the adaptability and potential of solar thermal technology.