물-에너지-식량 넥서스 분석을 위한 시설재배지의 기준작물증발산량과난방 에너지 부하 관계 분석
Relationship Analysis of Reference Evapotranspiration and Heating Load for Water-Energy-Food Nexus in Greenhouse
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Increasing crop production with the same amount of resources is essential for enhancing the economy in agriculture. The first prerequisite is tounderstand relationships between the resources. The concept of WEF (Water-Energy-Food) nexus analysis was first introduced in 2011, which helpsto interpret inter-linkages among the resources and stakeholders. The objective of this study was to analyze energy-water nexus in greenhouse cultivationby estimating reference evapotranspiration and heating load. For the estimation, this study used the physical model to simulate the inside temperatureof the agricultural greenhouse using heating, solar radiation, ventilated and transferred heat losses as input variables. For estimating referenceevapotranspiration and heating load, Penman-Monteith equation and seasonal heating load equation with HDH (Heating Degree-Hour) was applied. Forcalibration and validation of simulated inside temperature, used were hourly data observed from 2011 to 2012 in multi-span greenhouse. Results of thesimulation were evaluated using R2, MAE and RMSE, which showed 0.75, 2.22, 3.08 for calibration and 0.71, 2.39, 3.35 for validation respectively. When minimum setting temperature was 12℃ from 2013 to 2017, mean values of evapotranspiration and heating load were 687 mm/year and 2,147GJ/year. For 18℃, Mean values of evapotranspiration and heating load were 707 mm/year and 5,616 GJ/year. From the estimation, the relationshipbetween water and heat energy was estimated as 1.0~2.6 GJ/ton. Though additional calibrations with different types of greenhouses are necessary, theresults of this study imply that they are applicable when evaluating resource relationship in the greenhouse cultivation complex.
Abstract
Increasing crop production with the same amount of resources is essential for enhancing the economy in agriculture. The first prerequisite is tounderstand relationships between the resources. The concept of WEF (Water-Energy-Food) nexus analysis was first introduced in 2011, which helpsto interpret inter-linkages among the resources and stakeholders. The objective of this study was to analyze energy-water nexus in greenhouse cultivationby estimating reference evapotranspiration and heating load. For the estimation, this study used the physical model to simulate the inside temperatureof the agricultural greenhouse using heating, solar radiation, ventilated and transferred heat losses as input variables. For estimating referenceevapotranspiration and heating load, Penman-Monteith equation and seasonal heating load equation with HDH (Heating Degree-Hour) was applied. Forcalibration and validation of simulated inside temperature, used were hourly data observed from 2011 to 2012 in multi-span greenhouse. Results of thesimulation were evaluated using R2, MAE and RMSE, which showed 0.75, 2.22, 3.08 for calibration and 0.71, 2.39, 3.35 for validation respectively. When minimum setting temperature was 12℃ from 2013 to 2017, mean values of evapotranspiration and heating load were 687 mm/year and 2,147GJ/year. For 18℃, Mean values of evapotranspiration and heating load were 707 mm/year and 5,616 GJ/year. From the estimation, the relationshipbetween water and heat energy was estimated as 1.0~2.6 GJ/ton. Though additional calibrations with different types of greenhouses are necessary, theresults of this study imply that they are applicable when evaluating resource relationship in the greenhouse cultivation complex.
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