Heat Balancing in Cooling Systems using Distributed Pumping. Issue 2 (2020)

• Record Type: Journal Article
• Authors: Kallesøe, Carsten Skovmose; Nielsen, Brian Kongsgaard; Tsouvalas, Agisilaos
• Is Part Of: IFAC-PapersOnLine. Volume 53:Issue 2(2020)
• Page Start: 3292
• Page End: 3297
• Publication Date: 2020
• Subjects: Cooling Systems -- Distributed Optimization; Automatic control -- Periodicals; 629.805
• DOI: 10.1016/j.ifacol.2020.12.1139
• Languages: English
• ISSNs: 2405-8963

Abstract

Abstract: Hydronic cooling systems are often used in large buildings. In these systems, chilled water is transported from the chillers to Air Handling Units (AHUs) via a water distribution system. The temperature of the exhaust air from the AHU is controlled by the flow of the chilled water in AHUs. Installation costs are very important for the building sector, which has lead to a new structure of the hydronic system using distributed pumps. This paper derives a control scheme for this new structure that ensures flow requirements at the chillers and controls the air temperature at the local AHUs. Saturation problems are well known in hydronic systems and can lead to poor control performance in parts of the building. To mitigate this problem the hydronic system needs to be hydraulically balanced. With the proposed control this balancing procedure is handled automatically. The balancing algorithm is verified by a Modelica model of an office building.