Experimental Case Study - Design for Micro-Combined Cooling, Heating and Power Systems - page 348

Fig. 9 Southwest fa ç ade-3D of the experimental residence

The most important heat losses are those transferred through the walls, the roof,
the windows, and the ventilation system. Thermal insulation of the building is
ensured by the envelope. Thus, the exterior walls are extruded polystyrene over
masonry brick structure and the floor above the basement, and most of the top oor

and attic are insulated.
For the method application should identify for all sides, the walls and windows
of the building and conductive heat transfer through all elements of the building
envelope from one side to the other: walls, floor, roof, windows, doors, etc.

Table 7 presents the materials thickness and thermal proprieties for all elements
of the building envelope. Based on these data, using the relationship 12 in Chap.
“

Structural Design of the mCCHP-RES System ” , the overall heat loss coef cient or

U value was calculated.

Taking into account the architectural details of the building and the materials
used (for which the U

—

— values are given in the Table 7 ), the building heat loss

coef cient (UA) is calculated, by identifying every route of heat loss from the

building (Table 8 ).
The annual energy need for heating was determined using Eq. 23 in Chap.

“ Structural Design of the mCCHP-RES System ” . and UA value from the Table 8 .

It results:

Q heating ; year ¼ 0 : 024 UA HDD ¼ 24 ; 855 kWh = year ð 1 Þ

Similarly, the annual energy need for cooling was determined using Eq. 24 in
Chap. “ Structural Design of the mCCHP-RES System ” , and it results: