Chapter 21, Problem 21.5E

Explanation of Solution

Environmental Control Pattern:

The workflow for Environmental Control pattern that could be used as the basis of the design of a system to control the temperature in a greenhouse where the temperature should be between 10 and 30 degrees Celsius and if it falls below 10 degrees, the heating system should be switched on; if it goes above 30, the windows should be automatically opened is represented below:

Here the thermometers are used to record the temperature process and the control process controls the heater process and ventilator processes whose status are recorded and displayed in the system status...