#1 By: Ibraheem Kolawole, April 12th, 2014 07:13
I have been doing my dissertation research in Library recently as opposed to doing it at home, because of easy access to books, materials and all, but of recent every floor of the kimberlin building has been extremely cold, it is like 2 degrees in here, colder than being outside which averages 9 degrees these days. Particularly the second floor computer lab, I am not sure of what is wrong with the AHU in here but gas profile seem to be smiling and data shows efficient consumption, the reality however is that people are freezing in here, the electricity consumption the other hand seem to have a high baseload, suggesting air-condition or something might be left on all day long, it feels like Winter in here, please can the person in charge of the facilities in this building do something about this??
#2 By: Graeme Stuart, April 12th, 2014 13:29
According to the data it looks like the heating is only on sporadically at the moment.
Is any energy used to cool the library?
Perhaps @DMU_Energy, @carlholland or @Richard can offer advice?
#3 By: Richard Partridge, April 18th, 2014 10:25
I was assured last week in a meeting with Estates colleagues that Kimberlin's Building Management System is fully online and operational. We had suspicions leading up to and during the Christmas shutdown that this was not the case given the level of energy use, particularly gas, during the 'closed' period at Christmas when everything electrical than could be was powered off and heating systems set to 'frost protection' levels. The electrical baseload over that period was around the 40Kw mark.
There is a server room and several switch rooms (?4) in Kimberlin which are actively cooled with air conditioning, plus several chillers for vending. These will all contribute to this baseload electrical figure. In terms of air conditioning for study areas, we don't have such a system in the library in terms of refrigeration. Our main air handling unit which principally serves the 1997 extension (and the IT lab you mention) was replaced last summer. This has a small level of cooling to it if required (which the previous system didn't), but it mainly serves to circulate air and draw fresh air into the building to maintain fresh oxygen levels. There's an extensive system of temperature and CO2 monitors through the building which were installed in September 2012 in an effort to provide a greater level of monitoring and control to the BMS and this AHU. The AHU provides air to all floors (there are no localised systems, other than those serving the syndicate rooms) so the control systems look to balance the needs of the whole building. The highest generator of ambient heat and CO2 tends to be the first floor IT area, so thresholds in this space are set slightly higher, otherwise the AHU would be constantly pumping air into the whole building, which is what often happened before more sophisticated control systems were installed.
Your comment is about feeling cold however. As I type this response in Kimberlin I'm dressed in layers but still feeling on the cool side because of the gentle breeze falling from the ceiling diffusers, so I identify with the experience you outline. It does feel cold while sitting for long periods of time. My thermometer tells me it's an ambient 23 degrees though, which is well into an appropriate comfort area, so despite appearances the system might well be operating appropriately.
#4 By: Graeme Stuart, April 19th, 2014 13:40
Thermal comfort is more complicated than simple air temperature. Air movement is also an important factor. 23 degrees of moving air may feel uncomfortably cold. Perhaps @Paul_Cropper can help us with this?
Also, overnight electricity consumption has just dropped dramatically (since April 6th), any ideas?