Hey guys -
Recent mechanical engineering graduate working in building science for the past year or so.
I understand REM Rate isn't really meant to model central systems such as water loop heat pumps, yet here I am.
RESNET's MultiFamily Guidelines
(page 20) aren't the most detailed either.
I am modelling 5 units in a high rise which have one or more air-source heat pumps serving each unit's conditioned space.
Attached is a riser diagram, as well as mechanical schedules.
Here's what I have:
First step is to find the SEEReq (from MF guidelines) which is what my spreadsheet does - also attached.
I am not 100% sure about this step -
Capacity is chiller system output (EVAPCO 217, so 217 *2 because there are two chillers = 434) in BTU/hour so times 3412.142 (kW to BTU/hr)
Input is chiller system power in Watts (is this 2 * 8 * 1000 Watts = 16,000)
AUX is the total of the pumping and fan power in Watts - this is the basically all the pumps that are responsible for "normal service operation" - I guessed 60 hp, CPWP-1&2, but I am really unsure, plus 2*20 (motor from fan in chiller) so 100 HP converted to Watts - I assumed motor efficiency of 0.8
Assuming my SEEReq is correct - 13.30 how should I proceed inputting this into REM, meaning what should I input into library type in the mechanical equipment screen?
Should I select Space Heating/Cooling, or select Air Source Heat Pump (new for version 15)?
I am modelling heating as per page 19 in same RESNET document.