International Journal of Energy Engineering          
International Journal of Energy Engineering(IJEE)
ISSN:2225-6563(Print)
ISSN:2225-6571(Online)
Frequency: Quarterly
Editor-in-Chief: Prof. Sri Bandyopadhyay(Australia)
A Variable Insulation System With Potential Application in Cold Climate Greenhouses
Full Paper(PDF, 8967KB)
Abstract:
Greenhouse structures are widely used to enable sheltered plant growth. However, traditional transparent greenhouse structures are generally only used in moderate climates because the cost of the energy required for heating in cold climates is prohibitively high. This paper describes a new approach to the design trade-off between light transmission and thermal insulation in greenhouse structures. Here, a low power variable insulation system combining sunlight-concentrating structures and low cost thermal insulation is shown to be a potentially practical solution. Experimental devices have achieved thermal insulation values exceeding 3.33 m2K/W (compared to 0.42 m2K/W for triple layer polycarbonate greenhouses) while also maintaining light transmittance values greater than 70%.
Keywords:Variable Thermal Insulation; Compound Parabolic Concentrator; Light Valve; Cold Climate Greenhouses
Author: Angel Valerio1, Michele Mossman1, Deborah Henderson2, Lorne Whitehead1
1.Department of Physics and Astronomy, The University of British Columbia, 6224 Agricultural Road, Vancouver, Canada
2.Institute for Sustainable Horticulture, Kwantlen Polytechnic University, 12666 72nd Avenue - Surrey, Canada
References:
  1. J. Opdam, G. Schoonderbeek, E. Heller, and A. De Gelder, Closed greenhouse: a starting point for sustainable entrepreneurship in horticulture, pp. 517-524, 2004.
  2. A. Monteiro, Greenhouses for mild-winter climates: goals and restraints, pp. 21-32, 1988.
  3. G. Ntinas, P. Kougias, and C. Nikita-Martzopoulou, Experimental performance of a hybrid solar energy saving system in greenhouses, International Agrophysics, 25, 2011.
  4. D. G. Hessayon, The greenhouse expert, Sterling Publishing Company, Inc., 1994.
  5. B. Norton, Harnessing Solar Heat, Springer, 2014.
  6. E. M. Abdel-Bary, M. N. Ismail, A. A. Yehia, and A. A. Abdel-Hakim, Recycling of polyethylene films used in greenhouses—Development of multilayer plastic films, Polym. Degrad. Stab. 62, pp. 111-115, 1998.
  7. S. Cohen, and M. Fuchs, Measuring and predicting Radiometric Properties of Reflective Shade Nets and Thermal Screens, J. Agric. Eng. Res. 73, pp. 245-255, 1999.
  8. K. Aberkani, A. Gosselin, M. Dorais, and S. Vineberg, Effects of insulating foams between double polythylene films on light transmission, growth and productivity of greenhouse tomato plants grown under supplemental lighting, pp. 449-454, 2005.
  9. J. Villeneuve, D. De Halleux, A. Gosselin, and D. Amar, Concept of dynamic liquid foam insulation for greenhouse insulation and the assessment of its energy consumption and agronomic performances, pp. 605-610, 2004.
  10. H. J. Han, Y. I. Jeon, S. H. Lim, W. W. Kim, and K. Chen, New developments in illumination, heating and cooling technologies for energy-efficient buildings, Energy, 35, pp. 2647-2653, 2010.
  11. Urban Barns, Urban Barn designs and manufactures modular indoor greenhouses, 2014.
  12. L. Whitehead, Adjustable transmissive insulative array of vanes, system and building structure, PCT/CA2012/050848, 2013.
  13. R. Winston, Principles of solar concentrators of a novel design, Solar Energy, 16, pp. 89-95, 1974.
  14. A. Valerio, Light transmissive variable thermal insulator based on nonimaging optics with potential application in cold climate greenhouses, 2014.
  15. Colorado Energy, R-Value Table, 2014.
  16. F. P. Incropera, Fundamentals of heat and mass transfer, John Wiley & Sons, 2011.
  17. R. G. Driggers, Encyclopedia of optical engineering, CRC press, 2003.
  18. M. Kaviany, Principles of heat transfer, John Wiley & Sons, 2002.
  19. T. Boulard, J. Meneses, M. Mermier, and G. Papadakis, Characterisation of the mechanisms involved in the natural ventilation of greenhouses, pp. 383-398, 1994.
  20. T. Boulard, and A. Baille, Modelling of air exchange rate in a greenhouse equipped with continuous roof vents, J. Agric. Eng. Res. 61, pp. 37-48, 1995.
  21. D. Thorpe, Energy Management in Buildings: The Earthscan Expert Guide, Routledge, 2013.
  22. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Fundamentals Handbook, Atlanta, 1997.
  23. A. A. Valerio, M. A. Mossman, and L. A. Whitehead, Light valve based on nonimaging optics with potential application in cold climate greenhouses, 2014 Proceedings of SPIE Vol. 9191, pp. 91910K-1 to 91910K-15, 2014.
  24. P. Ineichen, A broadband simplified version of the Solis clear sky model, Solar Energy, 82, pp. 758-762, 2008.
  25. J. A. Duffie, and W. A. Beckman, Solar engineering of thermal processes, John Wiley & Sons, 2013.
  26. K. D. Dodson, and T. G. Squires, Polyethylene terephthalate film, 1975.
  27. Nielsen Enterprises, Vapor aluminization deposition specifications sheet, 2014.
  28. TAP Plastics, Mirrored Acrylic Sheets, 2014.
  29. Texas Instruments, LM61 2.7V, SOT-23 or TO-92 Temperature Sensor, 2014.
  30. J. M. Tarara, and G. A. Hoheisel, Low-cost shielding to minimize radiation errors of temperature sensors in the field, Horticultural Science, 42, 2007.
  31. Austria MicroSystems, TSL254 Light-to-Voltage, High sensitivity sidelooker package, 2014.
  32. J. F. Escobedo, E. N. Gomes, A. P. Oliveira, and J. Soares, Ratios of UV, PAR and NIR components to global solar radiation measured at Botucatu site in Brazil, Renewable Energy, 36, pp. 169-178, 2011.
  33. AFM, EPS Foam Type II technical data, 2014.
  34. B. J. Taylor, and M. S. Imbabi, The effect of air film thermal resistance on the behaviour of dynamic insulation, Build. Environ. 32, pp. 397-404, 1997.
  35. J. Yu, L. Tian, C. Yang, X. Xu, and J. Wang, Optimum insulation thickness of residential roof with respect to solar-air degree-hours in hot summer and cold winter zone of china, Energy Build. 43, pp. 2304-2313, 2011.
  36. R. Dylewski, and J. Adamczyk, Economic and environmental benefits of thermal insulation of building external walls, Build. Environ. 46, pp. 2615-2623, 2011.
  37. S. A. Al-Sanea, Thermal performance of building roof elements, Build. Environ. 37, pp. 665-675, 2002.
  38. H. Suehrcke, E. L. Peterson, and N. Selby, Effect of roof solar reflectance on the building heat gain in a hot climate, Energy Build. 40, pp. 2224-2235, 2008.
  39. Foam Control, EPS Foam Type II technical data, 2014.
  40. P. Fielder, and P. Comeau, Construction and testing of an inexpensive PAR sensor.BC Ministry of Forests, Research Branch, Victoria, 2000.
  41. Edmund Optics, Hot Mirrors, 2014.
  42. Konica Minolta, TL-1 Illuminance Meter, 2014.
  43. Arduino, Arduino Mega ATmega1280, 2015.
  44. WuXi, 12V Linear actuator model HB-DJ806, 2014.
  45. J. W. Wilson, D. Hand, and M. Hannah, Light interception and photosynthetic efficiency in some glasshouse crops, J. Exp. Bot. 43, pp. 363-373, 1992.
  46. A. V. Lotov, V. A. Bushenkov, and G. K. Kamenev, Interactive decision maps: Approximation and visualization of Pareto frontier, Springer, 2004.
  47. CO-EX, Multi-wall (Twin, Triple, Five, X-Strong and M-wall) Polycarbonate Panels from CO-EX Corporation, 2014.
  48. D. Ryan, T. Hinman, Sustainable Season Extension: Considerations for Design, National Center for Appropriate Technology, 2011.
  49. National Glass, Float Glass Manufacture, 2014.