<abstract xmlns="http://www.w3.org/1999/xhtml">This paper presents models/strategies for optimum performance of solar collector in closed loop systems. These models aim to maximize the obtained energy by thermal conversion of solar energy. The mass flow rate of the fluid from the primary circuit of the system is the control parameter. The semi empirical models and optimal control methods are in brief presented. The volume of the storage tank is important and the ratio Vs/Ac between this volume and area of the collectors is a key factor in appropriate sizing of the DHW system. Therefore, the paper establishes a relationship between this ratio and the mass flow rate of the fluid in the collector This paper also analyses the variation of the energetic performance (useful heat flux transferred to the storage tank, heat flux transferred to the water, water temperature in the storage tank) with the volume of the storage tank. Analysis was performed on an extensive set of meteorological data from Timisoara, Romania, with instantaneous data (measured at 15 seconds) for summer days, from July 2009, with different relative sunshine values, σ. Important differences have been observed between days with different stability levels - days more or less stable.</abstract>

This paper presents models/strategies for optimum performance of solar collector in closed loop systems. These models aim to maximize the obtained energy by thermal conversion of solar energy. The mass flow rate of the fluid from the primary circuit of the system is the control parameter. The semi empirical models and optimal control methods are in brief presented. The volume of the storage tank is important and the ratio Vs/Ac between this volume and area of the collectors is a key factor in appropriate sizing of the DHW system. Therefore, the paper establishes a relationship between this ratio and the mass flow rate of the fluid in the collector This paper also analyses the variation of the energetic performance (useful heat flux transferred to the storage tank, heat flux transferred to the water, water temperature in the storage tank) with the volume of the storage tank. Analysis was performed on an extensive set of meteorological data from Timisoara, Romania, with instantaneous data (measured at 15 seconds) for summer days, from July 2009, with different relative sunshine values, σ. Important differences have been observed between days with different stability levels - days more or less stable.

Fluid Flow Control in Domestic Hot Water Systems During Days with Different Radiative Stability Levels

Faculty of Power Engineering, Hydraulics, Hydraulic Machines and Environmental Engineering Department

Annals of West University of Timisoara - Physics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

This paper presents models/strategies for optimum performance of solar collector in closed loop systems. These models aim to maximize the obtained energy by...

Fluid Flow Control in Domestic Hot Water Systems During Days with Different Radiative Stability Levels

Published Online: Aug 29, 2018

Page range: 88 - 96

Received: Feb 21, 2018

Accepted: Jun 14, 2018

DOI: https://doi.org/10.2478/awutp-2018-0009

Keywords
Solar collector, Storage tank, Mass flow rate control

© 2018 Sanda Budea et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Fluid Flow Control in Domestic Hot Water Systems During Days with Different Radiative Stability Levels

Published Online: Aug 29, 2018

Page range: 88 - 96

Received: Feb 21, 2018

Accepted: Jun 14, 2018

DOI: https://doi.org/10.2478/awutp-2018-0009

KeywordsSolar collector, Storage tank, Mass flow rate control

© 2018 Sanda Budea et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Solar collector, Storage tank, Mass flow rate control