User manual

FAQ for CBECC-Res 2013
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Enter the values as they appear in the directory. Energy Factor is 0.60, Recovery Efficiency, Thermal
Efficiency, and Standby Loss are entered as %s, meaning 80.0 Recovery Efficiency, 1.31% standby
loss.
6. Can we expect to see a summary of HERS measures on the CF1R?
In an attempt to keep the CF1R as brief as possible, since the HERS provider will summarize the
measures when a project is uploaded, a summary on the CF1R will not be added. Within appropriate
sections you can find the specific HERS measures and any criteria needed to be met.
[Updated] Initially, the Energy Commission’s position was that when the project was registered, it
would be obvious which features require HERS verification. However, people often use a draft CF1R
during early stages of planning and asked for a list in one location. Staff has agreed to include such a
list. Expect to see that in the future.
7. Can you explain how the solar credit can be used and how much of a credit we can expect?
The solar credit is limited to a % of the amount of cooling TDV energy savings due to the jump from
federal AC SEER/EER requirements in 2014 and the SEER/EER federal requirements starting in 2015.
The credit percentages change by climate zone, but do not change with an increase in the size of the
PV system. This PV credit was meant to provide an energy credit for builders who would suffer the
extra expense of needing to increase the efficiency of AC equipment in 2015, which is why the PV
credit is only available with “2015 Compliance”, and only in climate zones where there is a
significant cooling load. We pre-calculated the % of cooling TDV that would be due to this change in
AC efficiency for each of the climate zones where the PV Credit is available, which is listed below.
Pg. 4 of the 2013 Residential ACM Reference Manual (http://www.energy.ca.gov/2013publications/CEC-
400-2013-003/CEC-400-2013-003-CMF.pdf) has a table for the PV Credit Calculation Factors:
Table 2-1: PV Credit Calculation
Factors
Max PV Cooling
Credit
Climate PV Generation Rate (% of Standard Design
Zone (kTDV/kWdc) Cooling kTDV/ft2)
09
30269
13%
10
30342
15%
11
29791
18%
12
29556
17%
13
29676
17%
14
31969
16%
15
29536
19%
The PVCredit is calculated as the MINIMUM of the PV Generation rate (in TDV) and the PV Cooling
Credit (in TDV, calculated as explained above, as a fixed percent of the cooling energy budget). So
what you are experiencing is that the PV cooling credit is the limiting factor, and that larger PV
Systems are not necessarily producing larger PV Credits.