Seasonal evaluation of heat pump system for building heating and ventilation – a case study

Wroclaw University of Science and Technology, Faculty of Environmental Engineering, ul. Norwida 4/6, 50-373 Wroclaw, Poland

^* Corresponding author: andrzej.bugaj@pwr.edu.pl

Abstract

This paper presents results obtained from seasonal evaluation of ground source heat pump (GSHP) and exhaust air heat pump (EAHP) systems used for heating and ventilation of a school building. A Matlab simulation program was developed with models of the following elements: the building thermal performance, central heating and ventilation installations, the ground source heat pump with the ground source heat exchanger and exhaust air heat pumps in air handling units. The system based exclusively on the GSHP attaining all heating needs of the central heating and ventilation installations was compared with the combined system of the GSHP and the EAHP. The analysis was based on hourly calculations of all energy capacities and COPs as well as seasonal performance factors. In addition, the energy ratings in terms of seasonal usage of delivered, renewable, auxiliary and primary energy were performed. Those energy ratings enabled the estimation of seasonal CO₂ emissions in all analysed systems. The combined application of the GSHP and the EAHP in the building gave the lowest values of primary energy consumption and CO₂ emissions among all considered systems.