Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The upcoming version of BEopt (3.1.0), expected next month, will include a number of new heat pump inputs, including heating capacity retention for both mini-split and central air source heat pumps. It will also have some updated performance curves and assumptions, particularly for variable speed heat pumps.
It will look something like this:
The default heating capacity retention fractions in BEopt 3.0.1 are:
They will change a little bit in BEopt 3.1.0.
That said, note that for a given rated HSPF, the heating capacity retention fraction will generally not have a significant effect on annual energy consumption because a higher fraction will result in a lower heat pump COP in order to achieve the specified rated performance. However, a higher retention fraction can result in a significantly smaller heat pump capacity, and therefore cost, for simulations with autosized equipment.
| | 2 | No.2 Revision |
The upcoming version of BEopt (3.1.0), expected next month, will include a number of new heat pump inputs, including heating capacity retention for both mini-split and central air source heat pumps. It will also have some updated performance curves and assumptions, particularly for variable speed heat pumps.
It will look something like this:
The default heating capacity retention fractions in BEopt 3.0.1 are:
They will change a little bit in BEopt 3.1.0.
That said, note that for a given rated HSPF, the heating capacity retention fraction will generally not have a significant effect on annual energy consumption because a higher fraction will result in a lower heat pump COP in order to achieve the specified rated performance. However, a higher retention fraction can result in a significantly smaller heat pump capacity, and therefore cost, for simulations with autosized equipment.
