On Differential Temperature Controller Setpoint Selection for Active Photovoltaic-Thermal (PV-T) Systems

Pedro Magalhães 1 * , João Martins 2 3, António Joyce 4

European Journal of Sustainable Development Research, Volume 3, Issue 1, Article No: em0066.

https://doi.org/10.20897/ejosdr/3926

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Abstract

Active photovoltaic-thermal (PV-T) systems for solar heating and electricity generation are likely to employ the same differential temperature pump controllers as equivalent non-hybrid solar thermal (ST) systems. However, the typical controller setpoint selection methods for cost-effective and stable pump operation fail to consider the effect on photovoltaic (PV) electricity generation taking place in PV-T systems. Analytical relations for the same goals were derived to anticipate this influence using the steady-state Florschuetz PV-T collector model and compared with equivalent numerical methods relying on an extension of the Perers model designed to encompass PV-T collectors, namely by modelling electricity generation and the associated thermal performance reduction. Both methods indicate the minimum turn-on and turn-off setpoints for cost-effective and stable operation increase and decrease, respectively, relative to those for non-hybrid operation of PV-T systems or equivalent non-hybrid systems, and more so at higher irradiance levels, though the variations are shown not to be significant for a range of PV-T systems represented and can be reasoned to be inflated or of limited practical relevance. In conclusion, the effect of pump operation on electricity generation is not predicted to be a determining factor for differential temperature controller setpoint selection in PV-T systems.

Keywords

photovoltaic, thermal, differential, control, setpoint, selection

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Magalhães, P., Martins, J., and Joyce, A. (2019). On Differential Temperature Controller Setpoint Selection for Active Photovoltaic-Thermal (PV-T) Systems. European Journal of Sustainable Development Research, 3(1), em0066. https://doi.org/10.20897/ejosdr/3926

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