Functional Design of the mCCHP-RES System - Design for Micro-Combined Cooling, Heating and Power Systems - page 313

Thermal agent temperature

81

80

79

78

77

76

75

74

73

72

0 0.5 1 1.5 2 2.5

x 10 5 Time [s]

Fig. 73 Thermal agent temperature evolution in the accumulation tank in summer regime, model 3

Thermal power

x 10 4

3

2.5

2

1.5

1

0.5

0

0.5 1 1.5 2 2.5

x 10 5

0

Time [s]

Fig. 74 Pellet boiler power evolution in summer regime, model 3

4.7 Simulation and Analysis of MCCHP System Model 4

—

In this functional model, the electrical energy is produced by the Stirling engine and
a PV source. The thermal energy is provided only by two sources: Stirling engine
and the pellet boiler.
The numerical simulation of the system in winter regime leads to identical
results with the ones obtained in model 1, since the structure of the system is the
same.
Figure 72 presents the numerical simulation scheme of the system in summer
regime, in which the

block has the form given by Fig. 42 . The
operating regime of the electrical subsystem is illustrated by Figs. 75 and 76 , where
the evolutions of the battery voltage and the electrical power delivered by the
Stirling engine are shown. These variations are similar to the ones obtained in
functional model 2 (see Figs. 57 and 54 , respectively), since there is only a small
difference between the two models: the consumption of the pump in the thermal
agent circuit of the solar thermal collector.

“ Electrical battery ”