Nutrient solution cooling and its effect on temperature of leaf lettuce in hydroponic system

被引：0

作者：

Nam, SW ^{[1
]}

Kim, MK ^{[1
]}

Son, JE ^{[1
]}

机构：

[1] Ansung Natl Univ, Dept Rural Dev Engn, Ansung 456749, South Korea

来源：

INTERNATIONAL SYMPOSIUM ON PLANT PRODUCTION IN CLOSED ECOSYSTEMS - AUTOMATION, CULTURE, AND ENVIRONMENT | 1997年 / 440期

关键词：

nutrient solution cooling; hydroponic system; cooling load; numerical model; cooling system utilizing ground water;

D O I：

暂无

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

The heat transfer characteristics of a hydroponic system were experimentally verified after theoretical establishment and the effect of nutrient solution cooling on the plant temperature was investigated. About 96 percent of the total heat flow transferred from culture bed to nutrient solution was the conductive heat through planting board and partitioning materials. The average and maximum temperatures of the leaf lettuce decreased 0.6 and 1.5 degrees C, respectively, with cooling of nutrient solution by 6 degrees C. A numerical model for prediction of cooling load of nutrient solution in a hydroponic greenhouse was developed, and the results from the simulation model showed a good agreement with those from experiments. A mechanical cooling system using the counter flow type with double pipes was developed for cooling the nutrient solution. Also the heat transfer characteristics of the system were analyzed experimentally and theoretically, and compared with the other existing cooling systems of nutrient solution. The cooling capacities of three different systems, which used polyethylene tube in solution tank, stainless tube in solution tank, and the counter now type with double pipes, were comparatively evaluated.

引用

页码：227 / 232

页数：6