Structural Design of the mCCHP-RES System - Design for Micro-Combined Cooling, Heating and Power Systems - page 229

Fig. 47 Performance indicators of the models

compression chiller is more ef cient than that with mechanical compression chiller.

The model 5 and 6 differ in number of heat sources, but these models have almost
identical performance indicators, reason that, in Chap. Functional Design of the
mCCHP-RES System will be analyzed only the

first 5 models.

7.4.2 Evaluation at the Couple Building-System Level

The energy performance of a building [ 22 ] shall be expressed in a transparent
manner and shall include an energy performance indicator and a numeric indicator
of primary energy use based on primary energy factors per energy carrier, which
may be based on national or regional annual weighted averages or a speci c value

for on-site production.
The energy performance indicator is energy class of the building, which by
Energy Performance Certi

cates (EPCs) give information only on building prop-
erties, resulting in energy needs (used).
For the mCCHP system, the energy ef ciency indicator indicate conversion

ef ciency on the system and the PES indicator indicate the percentage of fuel saved

from the energy production of the CCHP system compared to the same energy
produced by the reference system, without

indicating the share of renewable

energy.
The new numeric indicators of primary energy use refer to speci c value for on-

site production and the share of renewable energy.
A new generation of EN standards [ 23 ] for implementing the Energy Perfor-
mance of Building Directive introduced a clear distinction, between renewable and
nonrenewable primary energy. In this sense was de

ned for assessment of energy
performance of building, the two new indicators namely:

integrated energy performance of building, E p,tot ;

￿

￿ share of renewable or Renewable Energy Ratio (RER).