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The influence of weather conditions on energy performance of HVAC system and absorption cooling system coupling

Labus, Jerko; Korolija, Ivan; Marjanovic-Halburd, Ljiljana; Coronas, Alberto; (2010) The influence of weather conditions on energy performance of HVAC system and absorption cooling system coupling. In: IAQVEC Association Indoor Air Quality, Ventilation and Energy Conservation in Buildings. Indoor Air Quality Ventilation and Energy Conservation (IAQVEC): Syracuse, NY, USA. Green open access

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Abstract

In this study, the attention is focused on the influence of climate conditions and absorption chiller configurations on the energy performance of heating, ventilating and air conditioning (HVAC) systems. We will analyze the correlation between HVAC system dynamic load profile and the performance of various absorption cooling system configurations for two typical European climates: Mediterranean (more specific Spain) and Mild Atlantic Climate (UK). Dynamic simulation software EnergyPlus is used to calculate HVAC system cooling demand of typical narrow plan office building, equipped with variable air volume (VAV) system and placed in chosen climate regions. This cooling demand has been coupled with different absorption cooling system configurations developed in MatLab in order to analyze absorption chiller heat energy consumption. Preliminary results of this study shows that energy savings in terms of heat supply can be achieved when multiple absorption chillers are used. Spanish case study shows that up to 4.9% can be saved while in the UK savings go up to 6.17% when compared with basic scenario which is a single absorption chiller plant. The results also indicate that for the same building type, the combined influence of climate and national standards can produce up to four times higher cooling demand for building in Spain when compared with buildings in the UK. This directly affects the size of the absorption chiller plant which is 50% bigger and the number of hours when chillers are operating which is twice higher. INTRODUCTION Buildings in general are responsible for around 30% CO2 emission. A significant amount of energy in buildings is consumed by HVAC equipment. Over the last couple of decades, a significant increase of cooling energy demand, even in mild European climates, has been reported. That building cooling load is in direct correlation with chiller energy consumption. Improving the energy performance of the chiller plants is of particular interest because it usually presents the energy saving opportunity for airconditioning systems in buildings. Therefore, design parameters such as number of chillers, chiller size, operating conditions and control strategy can be a key factor for improving overall building energy performance.

Type: Proceedings paper
Title: The influence of weather conditions on energy performance of HVAC system and absorption cooling system coupling
Event: 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, IAQVEC 2010
Location: Syracuse, NY
Open access status: An open access version is available from UCL Discovery
Publisher version: https://www.iaqvecassociation.org/Conference.html
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Absorption chiller, Cooling demand, VAV system, Office building simulation
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10149634
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