Combined Micro-Systems - Design for Micro-Combined Cooling, Heating and Power Systems - page 78

All these must ensure the necessary heat for the residence. It results that, to
achieve a conceptual scheme of a mCCHP system, the energy demand of the
residential consumer must be known in advance. Depending on this demand (load
curves), the optimal architecture of the mCCHP system may be determined. In
establishing the architecture of the mCCHP system, the satisfaction of the residence
energy demand and of the system ' s being connected or not to the electricity grid,

must be had in view.
The general architecture of a micro-CCHP system based on renewable energy
(Fig. 13 ) might include the following sources:

a mCHP cogeneration unit

￿

auxiliary heating unit/units of the solar collector type and back-up heater

￿

photovoltaic panels

￿

thermal and/or electric energy storage unit

￿

an air-conditioning system thermally/mechanically activated.

￿

In the architecture structure diagram, two subsystems may be identi ed:

￿ Electrical energy supplying subsystem. The mathematical model of the electrical

subsystem is the one that describes the dynamic storage in the battery. It can be
written as follows:

dW B
dt ¼

P CHP t ðÞþ P PV t ðÞ P al t ðÞ P air t ðÞ ð 13 Þ

Fig. 13 General architecture of the mCCHP systems