20 September 2011
Field test of the Ground Source Heat Pump (GSHP) system applying variable
water volume (VWV) control and multi-split heat pump has been carried out from 2006 to 2009 in order to demonstrate the effect of reduction of circulation pumps’ electric power
consumption. The short-term test of the GSHP system indicated that the optimum flow rate decreases corresponding to decrease of the cooling output. This suggests that VWV control of the circulation pump contributes to reduction of circulation pumps’ electric power consumption the most. Based on the result, the GSHP system applying VWV control has
been operated and the system performance has been validated during whole cooling period in 2008. As the result, the GSHP system applying VWV control could reduce approximately
80 % of circulation pumps’ electric power consumption compared to constant water volume. Additionally, seasonal performance factor of the GSHP system was 4.51 and this result
achieved the target value of 4.5.