Speaker
Apply to be<br> considered for a student <br> award (Yes / No)?
yes
Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)
yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
yes
Main supervisor (name and email)<br>and his / her institution
Dr Michael Simon
msimon@ufh.ac.za
Fort Hare Institute of Technology
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
MSc
Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
Sanitary hot water production remains the principal issue to address in a typical residential house where electrical geysers still account for up to 45% of the total electrical energy consumption. Air source heat pump water heater could offer a permanent solution for water heating as it consumes 67% less amount of the energy use by a geyser for an identical heating load and operates at a COP of over 200% year round. But yet, air source heat pump (ASHP) water heater used in South Africa still present some possibilities for further system’s optimization in a bid to achieve a higher operation efficiency from an energy management perspective.
In this work, we present a MATLAB simulation of an ASHP water heater unit that incorporates a PID controller using ambient temperature feedback to adjust the speed of an inverter controlled variable speed compressor. A fan speed calibration curve is also determined that maps wind speed to the speed of the fan so as to reduce its energy consumption during minimal load. The simulation reveals a drop in power consumption of close to 8% during an average summer day and over 15% during a very sunny and windy day.
Keywords: Air source heat pump water heater, PID controller, variable speed compressor, capacity control and fan speed control.
