Quantitative Assessment of the Impact of Retrofitting an Electric Boiler with an Air Source Heat Pump Unit on a University Campus

Stephen L Tangwe (Central University of Technology, Free State, Bloemfontein & Fort Hare Institute of Technology, South Africa); Kanzumba Kusakana (Central University of Technology, South Africa)

The study focused on comparing the electrical energy and the volume of hot water consumed using the inefficient 18 kW, 1600 L electric boiler and an efficient and renewable air source heat pump (ASHP) unit with an input power of 6.0 kW, as retrofit to the electric boiler, for sanitary hot water production. A data acquisition system was built and deployed to monitor the baseline when the electric boiler was in used and the performance assessment when the ASHP water heater was in operation. The results depicted that the annual energy saving and the load factor reduction, due to the retrofitting of the electric boiler with the ASHP unit, was 52117.630 kWh and 0.092. One-way ANOVA test depicted that the p-value of the average month-day electrical energies consumed by the electric boiler and the ASHP water heater during the entire monitoring period was 1.09 x 10-22. The very small p-value confirmed a significant difference existed in at least one of the among four groups of the average month-day electrical energies consumed and the heating season. The implementation of ASHP water heater for sanitary water heating at the residence on University's campus served as sustainable energy technology.

Conference: UKSim-AMSS 22nd International Conference on Computer Modelling and Simulation, UKSim2020

Published: Mar 25, 2020

DOI: 10.5013/IJSSST.a.21.02.28