PERIOD OF DATA:
The relevant dates for this installation are:
- 12/09/18 – Initial Installation
- 24/10/18 – Tweaking Visit (Control HQ system optimized by an on-site engineer based on feedback from staff)
- 9/04/18 – Analysis of energy data from site (the winter’s heating usage)
Gas data for Oct 2017 – Aug 2018 has been compared with the data for Sept 2018 – March 2018. The kWh/Degree Day ºC has been used as a way of comparing concurrent weeks in a calendar year while taking into account fluctuations in external temperature. Like ‘miles per gallon’, but where the type of road and driving conditions have been standardised.
BEFORE INSTALLATION:
When the external temperature drops the building is under heated and when it is warmer
outside the building overheats.
The R2 value is a measure of how tightly the data points fit the trendline. This can also be thought of as a measure of the proportionality between two variables. An R2 value of >0.95 is deemed an exceptionally accurate data set. Graph showing the energy consumption prior to installation of the Control HQ system; 01/10/2017 – 12/09/17.
- The ‘Average Weekly Consumption / External Degree Days’ for 01/10/17 – 18/03/18 = 14.19 kWh/ºC.
- The ‘Average Weekly Consumption / External Degree Days’ for 01/10/17 – 09/09/18 = 18.54 kWh/ºC.
AFTER INSTALLATION:
- Period 1 after installation (01/09/2018 – 31/10/2018)
The ‘Average Weekly Consumption / External Degree Days’ = 0.78 kWh/ºC
Building used 6% of the energy than the average for the first 2 months post- installation, i.e. a 94% saving. - Period 2 after installation (31/10/2018 – 06/12/2018)
The ‘Average Weekly Consumption / External Degree Days’ = 6.27 kWh/ºC
Building used 34% of the energy than the average for the following 2 months, i.e. a 66% saving. - Period 3 after installation (06/12/2018 – 28/12/2018)
The ‘Average Weekly Consumption / External Degree Days’ = 21.50 kWh/ºC
Building used 152% of the energy than the average for the following 3 weeks, i.e. an increase of 52%. - Period 4 after installation (28/12/2018 – 13/02/2019)
The ‘Average Weekly Consumption / External Degree Days’ = 3.89 kWh/ºC
Building used 27% of the energy than the average for the following 2 months. i.e. a 73% saving. - Period 5 after installation (13/02/2019 – 18/03/2019)
The ‘Average Weekly Consumption / External Degree Days’ = 13.15 kWh/ºC
Building used 93% of the energy than the average for the following month, i.e. a 7% saving.
From the data provided, this report finds an average saving of 50% for the time period being monitored. It is likely that this figure will not be entirely accurate as the data provided is not of especially high resolution – however lengths have been taken in the calculations above to mitigate any discrepancies and take a worst case approach.
This report was put together by an industry specialist, using the widely accepted monitoring and verification processes and the guidelines set out by the International Performance Measurement and Verification Protocol (IPMVP). It was then independently verified by a 3rd party to confirm it’s accuracy and impartiality.
What were your first impressions of the Control HQ?
Peter Rhodes: “The user-interface seemed quite daunting at first, just because of the level of control we now had. Before we only had a time clock for the boiler and now we had one for every room, and I felt quite apprehensive about this, but as I got used to it I realised that, once set, we could just leave it alone to look after itself. This was excellent, as we didn’t want a system that we had to keep adjusting all the time.”
How was the installation?
Peter Rhodes: “The installation was completely non-intrusive and caused no disruption at all. Much of the equipment was installed in the loft space so there was little reason to go into any of the guests’ rooms.”
What have you liked about the Control HQ system?
Peter Rhodes: “The flexibility and ease of use of the system is important, but a major plus has got to be the cost savings as it all comes out of our budget to run the hostel.”
Have you benefited in any other way?
Peter Rhodes: “Having each of the rooms individually controllable has been very much appreciated by our residents. We can check on the temperatures in the individual rooms and it is excellent that the system manages itself and we only need to tweak it from time to time.”
