ZEMCH 2015 - International Conference Proceedings | Page 468
The DB2 simulation results and the achievement of the Passive house requirements are clarified
in the following table (Table 8).
Table 8: DB2 energy consumption parameters and Passive house requirements.
DB2
Heating*
Cooling*
Energy
Annual heating
demand
(kWh/m2a)
Heating load
(W/m2)
Overall space
cooling demand
(kWh/m2a)
Cooling load
(W/m2)
Consumption
parameters
0
14
15
11
Fulfil Passive
house
requirements
X
Primary Energy Energy reduction
(kWh/m2a)
through
renewables
(kWh/m2a)
223
-
X
*It is enough when only one of the parameters is fulfilled.
The DB2 simulation results showed a remarkable reduction on the cooling demand and load;
however, the primary energy consumption is kept high due to the inefficient mechanical systems
of domestic hot water and air conditioning. Therefore, during the next step these systems should
be upgraded.
DB3 simulation
The next step consists on improving the mechanical and electrical systems to obtain a higher
energy performance. During this step the model will be called DB3 (Table 9) (Fig. 23).
Table 9: DB3 building parameters.
Building
parameters
Site
DB3
Londrina, Brazil
Treated floor External wall
area TFA
U-value
(m2)
(W/m2K)
66.67
0.369
Windows
(including
frames)
U-value
(W/m2K)
Roof surface
U-value
(W/m2K)
Floor slab
U-value
(W/m2K)
Average
thermal
envelope
2.343
0.400
1.200
0.863
Figure 23: DB3 plan, section and domestic hot water heating system.
In addition to the solar domestic hot water production, other systems were improved such as the
insulation of the water pipes, the gas boiler efficiency and the lighting system is contemplated
with 100% of compact fluorescent lamps (Table 10).
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