Energy Saving in Greenhouse through Integrated Seasonal Energy Storage

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Energy Saving in Greenhouse through Integrated
Seasonal Energy Storage

• Presenter
• Fredrik Setterwall, Ecostorage Sweden AB
• Researcher
• Amir Vadiee, KTH

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Statisics in Sweden

• Approximately 300 ha
• Energy consumption 55 000 m3 of oil
  (corresponding to emission of 150 000 tons of
  CO2)
• Energy amounts to 20 50 of the value of the
  products

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Background What is a Closed Greenhouse
No ventilation windows Cooling and
dehumidification Heat storage in summer Use of
stored heat in winter
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System components of a closed greenhouse

• (Thus Far) Aquifers and heat exchanger
• Could be Phase Change
• Heat Pumps
• Air treatment units
• Water storage/buffer in cold and hot water
• Solar energy management
• Climate control system
• Cogeneration CHP

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Background Advantages of a Closed Greenhouse
(Literature survey)

• 20 increase in production
• Favorable levels of CO2 maintained (1000ppm²)
• Improved water conservation, 40-50
• Reduced pesticide use-80
• Quality control of product
• Opportunity to define deliviry date
• Possibility for having a small cogeneration unit
• Use of renewable energy sources
• Adoptivly to any weather condition
• Improved overall efficiency of greenhouse
  operation
• Improved economic viability

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Background Advantages of TES to Closed
Greenhouse (literature survey)

• Improve the energy efficiency (30-34)
• Improve water conservation
• Improve the control of system
• Improve CO2 concentration level
• Improve sustainable management
• Improve the production rate
• Using renewable energy technology
• Replicable in all climates
• Decrease the pesticides

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Closed Greenhouse Overview
Refhttp//www.innogrow.nl/English/about_innogrow/

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Challenges

• Complicity of climate controlling
• Choose an efficient and proper thermal storage
  system
• Need for new structures and insulation material
• Capital investment and other financial
  considerations
• Using new methods and unfamiliar for the growers

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Greenhouse Climate
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Thermal storage methods
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Project Outline

• Survey of Swedish commercial green house sector
  related to energy consumption and emission of
  green house gases questionare greehouse_form.docx
•  
• Energy and carbon dioxide balances of a number of
  commercial green houses
•  
• Design of underground thermal energy storages
•  
• Design of short term energy storages
•  
• Complete system for closed green house including
  energy and mass balances
•  
• Effect of suggested solution on competitiveness
  of green house industry

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Ulriksdals Castle will make use of its own
Greenhouse Effect

• Store Excess Heat from Greenhouse
• Replace Oil for Heating Purposes
• A greenhouse typically collects 3 times its own
  annual energy consumption.
• There is enough (theoretically) to also heat the
  castle

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Project Participants
MEMBERS Viktoria Martin, Ph.D. (project
manager) Amir Vadiee, PhD candidate Fredrik
Setterwall, Professor emeritus REFERENCE
GROUP EcoStorage IEA (Annex 22) Slottsträdgården
Ulriksdal SLU Statens fastighetsverk Swegro Sweco
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Next Step

• A survey of Swedish greenhouse
• Build the models for each type of TES using
  TRNSYS
• Build the models for open and closed greenhouse
  using TRNSYS
• Connect the models to each other in order to have
  a complete model
• Result validation
• Result evaluation

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Conclusion

• Closed greenhouse can be sustainable solution
  regarding to energy management as the literature
  survey result
• Climate control in the greenhouses specially in
  the closed greenhouse concept is challenging
  point
• Different types of climate control systems need
  to assessed in order to find the best
  configuration
• Different types of TES can be used and it should
  be assessed to find the optimal solution due to
  case study
• In order to verification the model experimental
  data is essential (case study)

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Questions