Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
권호 표지
DOI QR코드

DOI QR Code

Effects of Fan-Aspirated Radiation Shield for Temperature Measurement in Greenhouse Environment

  • Yang, Seung-Hwan (Center for Safety Measurement, Korea Research Institute of Standards and Science) ;
  • Lee, Chun-Gu (Major of Biosystems Engineering, Seoul National University) ;
  • Kim, Joon-Yong (Major of Biosystems Engineering, Seoul National University) ;
  • Lee, Won-Kyu (Interdisciplinary Program for Bioengineering, Seoul National University) ;
  • Ashtinai-Araghi, A. (Major of Biosystems Engineering, Seoul National University) ;
  • Rhee, Joong-Yong (Major of Biosystems Engineering, Seoul National University)
  • Received : 2012.07.16
  • Accepted : 2012.08.30
  • Published : 2012.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

Purpose: Provision of accurate temperature measurement is an essential element to ensure a precise control in greenhouse environment. This study was organized to compare the effects of six solar radiation shields with different shapes for temperature measurement and find the most appropriate shield for greenhouse environment. Methods: A fan-aspirated radiation shield was designed and manufactured. Using the fan-aspirated radiation shield and five other shapes i.e., the cup shape, horizontal pipe, vertical pipe, parallel boards and commercial shields, temperature measurement was conducted over the lawn surface as well as greenhouse indoor environment. The measurement height varied at 0.5, 1.0 and 1.5 m from the floor. Results: The measured temperatures by the fan-aspirated radiation shield were 1.30-$1.49^{\circ}C$ lower than the values recorded by other different-shaped shields at 1.5 m of measurement height. As the measurement height decreases, observed differences between measured temperatures of the fan-aspirated radiation shield and other shields demonstrate a declining trend. However, at low measurement heights, the radiation emitted from the bottom surface would be the source of error in temperature measurement. Conclusions: The fan-aspirated radiation shield is a required tool for exact measurement of air temperature in greenhouse temperature control.

Keywords

References

  1. Bhattacharya, S. and S. M. Kresta. 2002. CFD Simulations of Three-Dimensional Wall Jets in a Stirred Tank. The Canadian Journal of Chemical Engineering, 80(4): 1-15. https://doi.org/10.1139/v01-199
  2. Erell, E., V. Leal and E. Maldonado. 2005. Measurement of Air Temperature in the Presence of a Large Radiant Flux: An Assessment of Passively Ventilated Thermometer Screens. Boundary-Layer Meteorology 114: 205-231. https://doi.org/10.1007/s10546-004-8946-8
  3. Holman, J. P. 2010. Heat Transfer. New York, McGraw-Hill. pp.459-460.
  4. Lee, I. B. and T. H. Short. 2001. Verification of Computational Fluid Dynamic Temperature Simulation in a Full-Scale Naturally Ventilated Greenhouse. Transactions of the ASAE 44(1): 119-127. https://doi.org/10.13031/2013.2303
  5. Ma, J., W. J. Bock and W. Urbanczyk. 2004. Error Analysis of Temperature-Compensated White-Light Interferometric Fiber-Optic Strain Sensor. Sensors and Actuators A: Physical 112(1): 25-31. https://doi.org/10.1016/j.sna.2003.12.008
  6. Ministry of Environment. 2008. Law on Meteorological Observation Standardization 2-1-1.
  7. Nakamura, R. and L. Mahrt. 2005. Air Temperature Measurement Errors in Naturally Ventilated Radiation Shields. Journal of Atmospheric and Oceanic Technology 22(7): 1046-1058. https://doi.org/10.1175/JTECH1762.1
  8. Peon, G., A. Camón, E. Martínez, C. Rillo, J. Sese and R. Iturbe. 1998. Experimental Analysis of Thermalisation and Emissivity of Radiation Screens for Cryostat Design. Cryogenics 38(10): 953-958. https://doi.org/10.1016/S0011-2275(98)00067-8
  9. Richardson, S. J., F. V. Brock, S. R. Semmer and C. Jirak. 1999. Minimizing Errors Associated with Multiplate Radiation Shields. Journal of Atmospheric and Oceanic Technology 16(11): 1862-1872. https://doi.org/10.1175/1520-0426(1999)016<1862:MEAWMR>2.0.CO;2
  10. Yang, G. M., H. K. Koh and J. H. Hong. 2003. Development of Dome-Type Cold Storage Facility Using 3-D CFD Simulation. Journal of the Korean Society of Agricultural Machinery 28(1): 35-44. https://doi.org/10.5307/JBE.2003.28.1.035
  11. Zakrzewska, B. and Z. Jaworski. 2004. CFD Modeling of Turbulent Jacket Heat Transfer in a Rushton Turbine Stirred Vessel. Chemical Engineering & Technology 27(3): 237-242. https://doi.org/10.1002/ceat.200401988

Cited by

  1. Surplus thermal energy model of greenhouses and coefficient analysis for effective utilization vol.14, pp.1, 2016, https://doi.org/10.5424/sjar/2016141-7517
  2. Utilization and performance evaluation of a surplus air heat pump system for greenhouse cooling and heating vol.105, 2013, https://doi.org/10.1016/j.apenergy.2012.12.038