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Energies 2016, 9(8), 573;

Optimal Cooling Load Sharing Strategies for Different Types of Absorption Chillers in Trigeneration Plants

Department of Mechanical Engineering, University Rovira i Virgili, CREVER-Research Group on Applied Thermal Engineering, Avda. Països Catalans 26, Tarragona 43007, Spain
Author to whom correspondence should be addressed.
Academic Editor: Francesco Calise
Received: 16 March 2016 / Revised: 8 July 2016 / Accepted: 11 July 2016 / Published: 25 July 2016
(This article belongs to the Special Issue Simulation of Polygeneration Systems)
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Trigeneration plants can use different types of chillers in the same plant, typically single effect and double effect absorption chillers, vapour compression chillers and also cooling storage systems. The highly variable cooling demand of the buildings connected to a district heating and cooling (DHC) network has to be distributed among these chillers to achieve lower operating costs and higher energy efficiencies. This problem is difficult to solve due to the different partial load behaviour of each chiller and the different chiller combinations that can cover a certain cooling demand using an appropriate sizing of the cooling storage. The objective of this paper is to optimize the daily plant operation of an existing trigeneration plant based on cogeneration engines and to study the optimal cooling load sharing between different types of absorption chillers using a mixed integer linear programming (MILP) model. Real data from a trigeneration plant connected to a DHC close to Barcelona (Spain) is used for the development of this model. The cooling load distribution among the different units is heavily influenced by the price of the electricity sold to the grid which rules the duration of the operation time of the engines. The main parameter to compare load distribution configurations is the primary energy saving indicator. Cooling load distribution among the different chillers changes also with the load of the whole plant because the chiller performance changes with load. View Full-Text
Keywords: trigeneration; absorption chillers; optimal operation; partial load trigeneration; absorption chillers; optimal operation; partial load

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Conte, B.; Bruno, J.C.; Coronas, A. Optimal Cooling Load Sharing Strategies for Different Types of Absorption Chillers in Trigeneration Plants. Energies 2016, 9, 573.

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