|Title:||溫室微氣候環控裝置與系統之應用||Other Titles:||Applications of The Equipment and System for Greenhouse Microclimates Control||Authors:||周立強
|Keywords:||溫室微氣候;溫濕度控制模式;溫室設施樣本控制系統;greenhouse microclimates;the temperature-humidity control model||Issue Date:||Dec-1992||Publisher:||農業試驗所||Start page/Pages:||89-113||Source:||農業試驗所特刊第40號||Conference:||溫室環控自動感測技術研討會專集||Abstract:||
The purpose of this study is to install a simple sensing system for microclimates control in a fan-pad type greenhouse. The simple sensing system has been installed in a greenhouses located at Horticlture Department, National I-lan Institute of Agriculture & Technology. The system also has been operated to solve the problems such as stability and malfuction related to the system¡¦s operation.
The system is mainly classified as the temperature- humidity control mode 1 and has been modified to satisfy the control requirements. A computer program written by C- Language has been created to model the temperature-humidity control process. The equipment consists of 1 Personal Computer (PC), 1 PC multifunction lab card (involve 12 analog / digital converters, 2 digital/analog converters, 1 digital signal input/output-and-counter card), 1 multiplexer & amplifier card, SSR & relay driver board, 21 temperature sensors (AD590) and some other microclimate sensors. T type thermalcouple is being substituted by AD590 type temperature sensor to measure the temperature of soil layers, cover material, dry-wct bulb (both indoor and outdoor) and the leaf surfaces ; and a significant result has been found in this study. For the purpose of measuring microclimates, the sensors which include 1 electric-directed type ventilation temperature-humidity sensor, 1 solar- cell type radiation sensor, 1 goblet- generator type wind-speed sensor and 1 rain inductor are installed in a Agricultural Meteorological Data Acqusition station. This study shows that the set-up system well controls the temperature and humidity in the greenhouses.
Two other two contibutions are found from this study
(1) the cost of the set-up system is as low as $10,000, and
(2) the experience gained from the installation provides us much knowledge for future application.
As a result, the system set-up in this study can be applied to the greenhouses which require a strictly environmental control.
|Appears in Collections:||農業工程組|
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