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 specific value for on-site production. […]

7.4.1 Evaluation at the System Level In the fourth step of the design process have been identified the potential structural models by customizing the general structural model. Table 7 shows the set of identified potential structural models. Now the performance of these models should be evaluated in order to retain the best. The structural models […]

The governing strategy of the CHP unit is changed ensuring at any moment the thermal energy needed. In this case the prosumers can export electricity to the grid. The solar panels are dimensioned in this case to produce maximum energy in the month with the greatest consumption and radiation available, similar off-grid (resulting к;т = […]

The off-grid system ensures the energy only for own residential consumption in the two main forms, electrical and thermal. The CHP unit is governed by the powerdrive strategy ensuring the balance between PV production and electricity con­sumption of the residence. The thermal energy balance is kept in equilibrium by the additional boiler that balances the […]

Procedure for determining the performance indicators is similar to that described in Sect. 7.2. Admitting the same values for the overall efficiency of CHP unit and of additional boiler as in Sect. 7.2, and using data from Table 32 for monthly energy specific consumption of the mCCHP system in the case of cooling with thermal […]

Unlike the case of the off-grid model, when the imposed condition is the balance between required and produced power and heat, in case of the on-grid system the e_load l=l e_sys ———— Poly. (e_load) ——— Poly. (e_sys) Fig. 33 Electricity balances   Month   Fig. 34 Heat balances   imposed condition is the balance between […]

The off-grid system supplies the thermal and electrical energy for own residential consumption only. During operation, the whole CCHP system control is based on balancing the electrical energy production and consumption. Control of this balance consists in appropriate modulation of the electrical energy obtained from CHP unit, so that, together with the current PV panel […]

To calculate the two indicators PES and EFF, we need to determine the specific fuel consumption of CCHP system. Specific fuel consumption is the sum of fuel input for cogeneration unit and additional boiler. Its determination involves knowledge of cogeneration unit and boiler energy production, and cogeneration unit and boiler efficiency. To exemplify, let us […]