A comprehensive matrix of Energy Performance Improvements was highlighted for this site.
The adopted measures to achieve our target were:
- Temperature set points were modified in line with ASHRAE recommended standards to improve the Calibration and actual temperature set points were modified to the existing Outside Air Temperature sensors to improve the performance of the fresh air DX AHUs.
- Replacing non-compliant refrigerants and optimising a performance enhancing upgrade the refrigerant type and the optimising the refrigerant volume in 2 of the existing units. The benefits were not only that these units became more economical on energy, but this refrigerant is more readily available, more efficient, sustainable, lower cost, and most importantly, a lower Global Warming Potential (GWP), thus directly improving the customers Carbon Footprint.
- Room optimisation including rack and floor air blanking, minimising short cycling leakage and offering better air flow distribution around the room to the servers.
- Introduce intelligent DX ‘hold off’ controls to 5 of the 8 fresh air DX AHUs. This reduced power consumption for the mechanical cooling function on the AHUs and maximised the direct free air cooling potential.
- Installing EC fan upgrades to 3 of the primary existing AHUs benefited to a very high degree of improved efficiency. The smaller sized motor gave the same level of performance for less power consumption.
The existing site Power Usage Effectiveness (PUE) before the implementation of the programme was measured and calculated as 1.77
The seasonal PUE post project was completed became 1.65
Predicted savings for this project were £2,173/month.
Actual first month savings were £2,827/month. (30% higher than seasonal prediction)
The overall predicted savings for the first year is tracking at £24,037. (seasonal adjustment for Free Cooling potential taken into account)
This gives an ROI for the project of 3.3 years.