Approaches for the optimized control of solar thermally driven cooling systems

作者：Nienborg Bjorn^*; Dalibard Antoine; Schnabel Lena; Eicker Ursula

来源：Applied Energy, 2017, 185: 732-744.

DOI：10.1016/j.apenergy.2016.10.106

• Solar cooling
• Control strategies
• Absorption chiller
• Adsorption chiller
• Heat rejection

Small scale (solar-) thermally driven cooling systems suffer from two important drawbacks: firstly, the systems usually offer no means of adapting the chilling capacity to the actual load; secondly constantly running pumps and fans lead to high auxiliary electricity consumption even when the available driving and cooling water temperatures only allow a reduced chilling capacity. To solve these problems a generic approach for controlling the main parasitic electrical devices - the cooling water pump and the heat rejection fan - as a function of the actual boundary conditions was developed. Different variants of control strategies are analyzed in different system configurations under a variety of climates and load conditions by means of dynamic system simulations in TRNSYS. The most typical combinations of ab- and adsorption chillers with dry cooler and wet cooling tower are covered. The results show that capacity modulation can be realized well by this approach. Additionally electricity savings of up to 25% can be achieved for reasonably sized systems compared to a reference control strategy with fixed pump speed and fixed cooling water set temperature. Yet it becomes obvious that the concrete savings depend strongly on the system configuration and boundary conditions.

• 出版日期2017-1-1