ghost
commented
6 years ago Hi Trystan,
Those are the default values from SAP – and in many cases won’t be far off the mark when you look at SPF, rather than the straight COP.
I have a job to do updating and separating the libraries properly – there will be a ‘Carbon Coop’ library, that contains the more detailed info, that we’re happy for our assessors to use and will be private to URBED/Carbon Coop/ CAfS (trained MHEP users); and a default library that will be a lot simpler, probably based on only publicly available data (e.g. from SAP) and will be fully editable by users.
I just haven’t had time to do this yet, but know it needs done, so it’s creeping up the priorities list.
Until it is, is there a way of using a blank/ old default library in the accessible OpenBEM library?
Thanks,
Marianne
From: Trystan Lea notifications@github.com Reply-To: emoncms/MyHomeEnergyPlanner reply@reply.github.com Date: Tuesday, 6 March 2018 at 12:24 To: emoncms/MyHomeEnergyPlanner MyHomeEnergyPlanner@noreply.github.com Cc: Subscribed subscribed@noreply.github.com Subject: [emoncms/MyHomeEnergyPlanner] Heat pump performance (#360)
I notice that the default library that the three heat pumps included have particularly low efficiencies.
HPMP1:
winter_efficiency: 230, summer_efficiency: 170,
HPMP2:
winter_efficiency: 170,
summer_efficiency: 170,
HPMP3:
winter_efficiency: 170,
summer_efficiency: 170,
In the second energy savings trust study, the average performance for ground source was 2.8 and air-source 2.45. With a range of 1.6 to 3.8 for ground and 2.0 to 3.6 for air source.
http://www.energysavingtrust.org.uk/sites/default/files/reports/TheHeatisOnweb%281%29.pdf
I notice that a lot of the building fabric measures are caveated with installation quality notes eg:
160-200mmmm thick vapour permeable external wall insulation system EWI with render finish. To include insulation to all window and door reveals and thresholds, treatment of roof eaves and verges junctions, taking insulation to at least 300mm below the level of the internal floor so thermal bridge is reduced. It will also require adjustments of external drainage pipework, and removal/refixing of sundry items satellite dishes, telephone connections, alarm boxes, boiler flues, bird boxes, gates and fences etc.
I wonder if the same should apply to heat pump options. Where an option to select a well designed and installed heat pump could be an option?
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TrystanLea
I notice that the default library that the three heat pumps included have particularly low efficiencies.
HPMP1:
winter_efficiency: 230, summer_efficiency: 170,
HPMP2:
HPMP3:
In the second energy savings trust study, the average performance for ground source was 2.8 and air-source 2.45. With a range of 1.6 to 3.8 for ground and 2.0 to 3.6 for air source.
http://www.energysavingtrust.org.uk/sites/default/files/reports/TheHeatisOnweb%281%29.pdf
I notice that a lot of the building fabric measures are caveated with installation quality notes eg:
160-200mmmm thick vapour permeable external wall insulation system EWI with render finish. To include insulation to all window and door reveals and thresholds, treatment of roof eaves and verges junctions, taking insulation to at least 300mm below the level of the internal floor so thermal bridge is reduced. It will also require adjustments of external drainage pipework, and removal/refixing of sundry items satellite dishes, telephone connections, alarm boxes, boiler flues, bird boxes, gates and fences etc.
I wonder if the same should apply to heat pump options. Where an option to select a well designed and installed heat pump could be an option?