What is constant temperature control system?
Abstract: Constant temperature control system is studied in this paper, which is based on AT89S51 produced by ATMEL company as the control core. The characteristic of this system is small volume, low cost, strong function, simple and widely used.
What temperature should a solar collector system be set to?
To achieve the best operation of the SWH systems and protect their components from overheating, the desired outlet water temperature, Tod, is set to be 75 °C, and the temperatures of other components of the solar collector systems are set to be below the boiling water temperature at 1 atm pressure (i.e., 95 °C).
How well do SWH controllers regulate water temperature?
From Fig. 11 a-b, it can be found that the proposed controllers managed to regulate To at the desired value of 75 °C for 5 and 2 hrs. under clear and cloudy sky conditions, respectively. As shown in Table 3, the performance of SWH system 4 illustrates equal periods of steady-state outlet water temperature as the one in SWH system 3.
Is TC maintained within the accepted limit in both solar radiation conditions?
Moreover, Tc was maintained within the accepted limit in both solar radiation conditions. The performance of SWH system 3 illustrated a shorter period of steady-state time for the outlet water temperature in comparison with SWH systems 1 and 2.
What temperature does a closed-loop controller maintain for a cloudy sky condition?
For the cloudy sky condition, the closed-loop controller maintained To at 75 °C for 3 h for SWH systems 1, 2, and 4, and 2 h for SWH systems 3. Regarding maintaining the temperature of the other components of the four SWH systems within the permissible limits, both closed- and open-loop systems managed to satisfy this condition.
How to control water temperature under clear skies solar radiation?
Hence, two controllers, namely robust and Proportional-Integral-Derivative (PID), are utilized to work in harmony in order to control the water temperatures of four SWH systems under clear and cloudy skies solar radiation conditions.
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