Abstract
Flat plate solar collector has been presented as an example of a heat-exchanger with two input signals, solar radiation intensity and temperature of working medium on the input, and one output signal, the temperature of a working medium on the output. The dynamics of heat exchange were analyzed for two models of a solar collector—an analog one using a thermoelectric analogy, and a digital one—determined experimentally in on-line mode using the parametric identification method. The characteristics of both models were compared in terms of their step and frequency response for selected construction and operational parameters. Tests of step responses determined for the analog model indicate that the dynamics of heat exchange in the solar collector depending on two input signals is varied. For step-forcing of input signals of the analog model, in both cases, a stable steady state is achieved, but while the first of the signals is inertial, the second one is oscillatory. The phenomenon of temperature oscillation at the collector outlet suggests the need to introduce a new physical quantity in the thermoelectric analogy-thermal inductance. Such an assessment of the dynamics of the solar collector can be useful for proper designing (construction parameters simulation) and diagnostics (operational parameters simulation) of the device.
Highlights
The main tasks of solar systems are effectively collection, processing, and accumulation of solar energy
Having the analog model of the solar collector, it is possible to determine the influence of changes in the construction and operational parameters on the dynamics of the appliance operation, to determine design guidelines for solar heating systems
It becomes possible to diagnose the solar collector as part of a solar heating system
Summary
The main tasks of solar systems are effectively collection, processing, and accumulation of solar energy. It is connected with the need to recognize the thermal processes occurring in the solar collector, as well as to define the impact of the device construction and/or operational parameters on these processes. This task is connected with proper design of the components of such a system and with automation of its functioning, especially if it is one of the segments of hybrid energy system (HES) [1,2]. Summarizing, proper recognition of heat transfer phenomena occurring in the solar collector in relation to construction and operational device parameters is directly related to the identification of the impact of these parameters on the dynamics of device operation. This publication presents the dynamics of heating up of solar collector’s working medium
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