Published August 31, 2020 | Version v1
Journal article Open

DEVELOPMENT OF A SOIL REGENERATOR WITH A GRANULAR NOZZLE FOR GREENHOUSES

Creators

  • 1. V.S. Martynovsky Institute of Refrigeration, Cryotechnologies and Ecoenergetics Odessa National Academy of Food Technologies

Description

The results of the development of a regenerative-type heat exchange unit for greenhouses are presented. The creation of a soil regenerator is conditioned by energy and economic expediency. In spring in the daytime, the air in greenhouses is intensely heated by solar radiation, and at night it can be cooled below the allowable temperature. Heat accumulation during the day and using this heat at night will reduce the need for heaters even to their complete exclusion. The soil regenerator contains a dense layer of granular material that is blown through by the air from the inner space of a greenhouse. This solution makes it possible to intensify significantly the heat exchange. To determine the mean intercomponent heat exchange factor, the empirical dependence, taking into consideration the effect of duration of the heat exchange process, was obtained. We developed the procedure of thermal design calculation of a regenerator, using which the main geometric characteristics of the heat exchange area are determined. The results of the calculation of the soil regenerator for a greenhouse with the surface area of 18 m2 for the conditions of the warm continental climate were presented. The developed soil regenerator contains 5 channels that are 5.75 m long, filled with rubble. It was obtained that for the average solar radiation flow Qc=2,160 W and the duration of operation of the soil regenerator τΣ=6 hours, the accumulated heat at night can be consumed for 2.6 hours at the average ambient temperature t1=7 °C. As the ambient temperature rises, the time of regenerator operation will increase. The proposed soil regenerator is characterized by the design simplicity and its application will lead to an increase in energy costs to maintain the temperature mode in a greenhouse

Files

Development of a soil regenerator with a granular nozzle for greenhouses.pdf

Files (419.8 kB)

Additional details

References

  • Bartzanas, T., Tchamitchian, M., Kittas, C. (2005). Influence of the Heating Method on Greenhouse Microclimate and Energy Consumption. Biosystems Engineering, 91 (4), 487–499. doi: https://doi.org/10.1016/j.biosystemseng.2005.04.012
  • Taki, M., Rohani, A., Rahmati-Joneidabad, M. (2018). Solar thermal simulation and applications in greenhouse. Information Processing in Agriculture, 5 (1), 83–113. doi: https://doi.org/10.1016/j.inpa.2017.10.003
  • Mesmoudi, K., Soudani, A., Zitouni, B., Bournet, P. E., Serir, L. (2010). Experimental study of the energy balance of unheated greenhouse under hot and arid climates: Study for the night period of winter season. Journal of the Association of Arab Universities for Basic and Applied Sciences, 9 (1), 27–37. doi: https://doi.org/10.1016/j.jaubas.2010.12.007
  • Zhou, L., Li, X., Ni, G. W., Zhu, S., Zhu, J. (2019). The revival of thermal utilization from the Sun: interfacial solar vapor generation. National Science Review, 6 (3), 562–578. doi: https://doi.org/10.1093/nsr/nwz030
  • Pavlov, G. K., Olesen, B. W. (2012) Thermal energy storage – A review of concepts and systems for heating and cooling applications in buildings: Part 1 – Seasonal storage in the ground, HVAC&R Research, 18 (3), 515–538. Available at: https://www.tandfonline.com/doi/abs/10.1080/10789669.2012.667039
  • Almendros-Ibáñez, J. A., Fernández-Torrijos, M., Díaz-Heras, M., Belmonte, J. F., Sobrino, C. (2019). A review of solar thermal energy storage in beds of particles: Packed and fluidized beds. Solar Energy, 192, 193–237. doi: https://doi.org/10.1016/j.solener.2018.05.047
  • Liu, Y., Liu, Y., Tao, S., Liu, X., Wen, Z. (2014). Three-dimensional analysis of gas flow and heat transfer in a regenerator with alumina balls. Applied Thermal Engineering, 69 (1-2), 113–122. doi: https://doi.org/10.1016/j.applthermaleng.2014.04.058
  • Adeyanju, A., Manohar, K. (2009). Theoretical and Experimental Investigation of Heat Transfer in Packed Beds. Research Journal of Applied Sciences, 4 (5), 166–177. Available at: https://medwelljournals.com/abstract/?doi=rjasci.2009.166.177
  • Bu, S. S., Yang, J., Zhou, M., Li, S. Y., Wang, Q. W., Guo, Z. X. (2014). On contact point modifications for forced convective heat transfer analysis in a structured packed bed of spheres. Nuclear Engineering and Design, 270, 21–33. doi: https://doi.org/10.1016/j.nucengdes.2014.01.001
  • Teitel, M., Barak, M., Antler, A. (2009). Effect of cyclic heating and a thermal screen on the nocturnal heat loss and microclimate of a greenhouse. Biosystems Engineering, 102 (2), 162–170. doi: 10 https://doi.org/10.1016/j.biosystemseng.2008.11.013
  • Albrecht, K. J., Ho, C. K. (2017). Heat Transfer Models of Moving Packed-Bed Particle-to-SCO2 Heat Exchangers. ASME 2017 11th International Conference on Energy Sustainability. doi: https://doi.org/10.1115/es2017-3377
  • Messai, S., El, G., Sghaier, J., Belghith, A. (2014). Experimental study of the convective heat transfer coefficient in a packed bed at low Reynolds numbers. Thermal Science, 18 (2), 443–450. doi: https://doi.org/10.2298/tsci120715108m
  • Solodka, A., Volgusheva, N., Boshkova, I., Titlov, A., Rozhentsev, A. (2017). Investigation of heat exchange in a blown dense layer of granular materials. Eastern-European Journal of Enterprise Technologies, 5 (8 (89)), 58–64. doi: https://doi.org/10.15587/1729-4061.2017.112217
  • Kim, H.-K., Kang, G.-C., Moon, J.-P., Lee, T.-S., Oh, S.-S. (2018). Estimation of Thermal Performance and Heat Loss in Plastic Greenhouses with and without Thermal Curtains. Energies, 11 (3), 578. doi: https://doi.org/10.3390/en11030578