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cedkessler
Posts: 17
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 Posted: Fri Jun 27, 2008 2:17 pm Post subject: HVAC and DHW |
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Hi, i've got few questions about the different parameters and settings for Hvac and DHW.
1) When using a split/multi-split system as HVAC system, onto the heating tab, Design builder ask for the SEER (SEER for a heat pump). Following all the researches i did, i've only found definition of SEER/EER for cooling. Even in the "Non domestic HVAC Guide" nothing is mentioned about SEER for heat pump. The only efficiency about heating is referred as COP, coefficient of performance which does not include calculation on seasonal efficiency. My question is, should i enter the simple COP or could you give me any details on how to calculate the SEER for a heat pump?
2) About DHW parameters. When defining a DHW system, onto the tab "general" when asked for storage and second circulation details, the value by default is "auto". My question is, if using "auto" how are these values calculated by Design builder (or SBEM maybe)? Does it calculate it in function of the volume of the room or/and occupancy/activities, etc...
Thank you for your help,
Regards,
Cedric |
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Laurent_Support
Posts: 292
Location: Vincennes |
| Posted: Fri Jul 04, 2008 2:23 pm Post subject: |
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Hello Cedric,
1) | Quote: | | My question is, should i enter the simple COP or could you give me any details on how to calculate the SEER for a heat pump? |
In DesignBuilder the COP (heating or cooling) is only used to convert demand in energy consumption. So you should enter the mean global efficiency for all your system.
If you're using a heat pump you can use its SEER (given by supplier or independent organism) as COP.
2) Options you're speaking seem more related to SBEM (I don't see them in EnergyPlus mode). In E+, you set a ratio in the Activity tab and a hot water production in the HVAC. Demand is calculated with the Activity DHW ratio.
Regards,
_________________
Laurent |
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