Modeling of the Internal Temperature for an Energy Saving Chinese Solar Greenhouse -- 2

A greenhouse is defined as a covered structure that provides
plants with an optimally controlled environment for adjustment
of climate growth conditions, in order toreduce production cost
and increase crop yield. Global food production systems
depend on the proper utilization of greenhouses. Many
greenhouse types are successfully used for plant protection
worldwide. Some may be better than others for particular
applications, but no greenhouse type is considered the best [1].
Control of the micro-climate of the greenhouse is essential in
order to encourage crop production considering the unstable
nature of temperature, relative humidity, CO2 concentration,
and solar radiation [2-8]. The possibilities offered by
greenhouse climate computers have solved the problems
relating to the regulation and respect of climate instructions
required by protected cultivation. The greenhouse climate
computer will have to be integrated as a tool for the dynamic

management of production, able to choose the most appropriate
climate route, meet objectives and production orders while
minimizing inputs. Computers have become quite popular in
greenhouse management, even in countries where
environmental conditions do not inhibit the development of
plants. In developed countries, computers find a lot of
application in irrigation, boilers and climate control, where they
are used to regulate humidity, CO2, and artificial lighting. The
computers are used to determine climate set points and to
monitor alarm functions. The literature on control theory and
application of classical dynamic systems in the entire field of
greenhouse control and modeling is sufficient.