Heat Losses Estimation And Heating Required To Cucumber Planted In Greenhouses Under AL-Gabal AL-Akhdar Region Conditions

• Abdel-Wahab Ramadan Obaia

  Department of Agricultural Engineering - Faculty of Agriculture - Omar Al-Mukhtar University - Al-Bayda - Libya.

  Author

The present study was carried out in AL-Beida, AL-Gabal AL-Akhdar region, , Libya during the period from Oktober 2009 to May, 2010, in multi-span gable greenhouses (24 units). The objective of the study was to estimate total heat losses from the greenhouses and determenation number of heaters required for heating at difreent temperatures for cucumber crop (Beta Alfa hybrid). The ambient air temperature inside and ouside greenhouses was measuried by using the thermometer during the study. Ground surface area, perimeter and volume of greenhouse were calculated. Also, total heat losses due to conduction, convection and radiation and heat losses due to infiltration of cold air were calculated. The computer program was developed to estimate the total heat losses and heating required from the greenhouses .The following points were concluded based on the results of this study:

1. The average total heat losses was found to be 3378.81, 4434.69  kW, at inside air temperature 25, 30 oC, respectively.
2. The average total heat losses was found to be 1267.05, 1900.58, 2322.93, 4434.69 kW, at inside air temperature 15, 18, 20, 30 oC, respectively.
3. The average total heat losses was found to be 1478.23, 1900.58, 2956.46, 4434.69 kW, at inside air temperature 16, 18, 23, 30 oC, respectively.

The average number of heaters was found to be 6, 5, 4, 3, 3, 2  at inside air temperature 30, 25, 23, 20, 18, 16 oC, respectively. Also the average number of heaters was found to be 7, 6, 5, 5, 4, 4, 3, 2, 2, 1  at inside air temperature 0, 2, 4, 6, 8, 10, 12, 14, 16, 18 oC, respectively.

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