CODES

ADOPTS WITH AMENDMENTS:

International Energy Conservation Code 2012 (IECC 2012)

B-1 Calculation of end use energy loads for code compliance determination.

The energy loads for heating, cooling and hot water in the Proposed Design home shall be normalized to account for the differences in improvement potential that exist across equipment types using the following formula in accordance with the paper “The HERS Rating Method and the Derivation of the Normalized Modified Loads Method,” Research Report No. FSEC-RR-54-00, Florida Solar Energy Center.

nMEUL = REUL * (nEC × /EC r)

where:

nMEUL=normalized modified end use loads (for heating, cooling or hot water) as computed using Florida Building Commission approved compliance software.
REUL=Standard Reference Design home end use Loads (for heating, cooling or hot water) as computed using Florida Building Commission approved compliance software.
EC_r=estimated energy consumption for the Standard Reference Design Home’s end uses (for heating, including auxiliary electric consumption, cooling or hot water) as computed using Florida Building Commission approved compliance software.

and where:

nEC_x= (a* EEC_x – b)*(EC_x * EC_r * DSE_r) / (EEC_x * REUL)

where:

nEC_x=normalized energy consumption for Proposed Design’s end uses (for heating, including auxiliary electric consumption, cooling or hot water) as computed using Florida Building Commission approved compliance software.
EC_r=estimated energy consumption for Standard Reference Designhome’s end uses (for heating, including auxiliary electric consumption, cooling or hot water) as computed using Florida Building Commission approved compliance software.
EC_x=estimated energy consumption for the Proposed Design home’s end uses (for heating, including auxiliary electric consumption, cooling or hot water) as computed using Florida Building Commission approved compliance software.
EEC_x=equipment efficiency coefficient for the Standard Reference Design home’s equipment, such that EEC_x = the energy consumption per unit load in like units as the load, and as derived from the manufacturer’s equipment performance rating (MEPR) such that EEC_x = 1.0/MEPR for AFUE, COP or EF ratings, or such that EEC_x equals 3.413/MEPR for HSPF, EER or SEER ratings.
DSE_r=REUL/EC_r * EEC_r

For simplified system performance methods, DSE_r equals 0.80 for heating and cooling systems. However, for detailed modeling of heating and cooling systems, DSE_r may be less than 0.80 as a result of part load performance degradation, coil air flow degradation, improper system charge and auxiliary resistance heating for heat pumps. Except as otherwise provided by these Standards, where detailed systems modeling is employed, it must be applied equally to both the Standard Reference Design and the Proposed Design homes.

EEC_r=Equipment efficiency coefficient for the Standard Reference Design home’s equipment, such that EEC_r equals the energy consumption per unit load in like units as the load, and as derived from the manufacturer’s equipment performance rating (MEPR) such that EEC_r equals 1.0/MEPR for AFUE, COP or EF ratings, or such that EEC_r equals 3.413/MEPR for HSPF, EER or SEER ratings.
REUL=Standard Reference Design home end use loads (for heating or cooling) as computed using Florida Building Commission approved compliance software.

and where the coefficients 'a’ and 'b’ are as defined by Table B-1(1).

TABLE B-1(1)
COEFFICIENTS 'a’ AND 'b’

Fuel type and End Useab
Electric space heating2.25610
Fossil fuel* space heating1.09430.4043
Biomass space heating0.88500.4047
Electric air conditioning3.80900
Electric water heating0.92000
Fossil fuel* water heating1.18771.0130
* Such as natural gas, LP, fuel oil

B-2

Following normalization of the heating, cooling and hot water energy consumptions for the Proposed Design as specified in Section B-1 above, the Standard Reference Design home’s total reference end use loads for heating, cooling and hot water (REULtot) shall be compared with the Proposed Design home’s total normalized modified end use loads for heating, cooling and hot water (nMEULtot). If the total normalized modified loads of the Proposed Design home (nMEULtot) are equal to or less than the total reference loads of the Standard Reference Design home (REULtot), the Proposed Design complies with this code.

Resources