SUMMER COOLING LOADS CALCULATION

SUMMARY OF THE APPROACH FOR OUR ALL AIR SYSTEM

QTOTAL = QSensible +QLatent (Table 16)

Where the sensible load is:

Where:

�� - External opaque structures (Table 8)

�� ���� - Opaque structures not conditioned spaces  Not considered in this simplified approach

�� �� - Opaque structures conditioned spaces  Not considered in this simplified approach

�� �� - External transparent structures (convection) (Table 7 and Table 8)

�� - External transparent structures (rad.) (Table 8) ���� �� – Ventilation  Not considered for All air systems

�������� �� - Internal loads ( Table 9 and Table 10) (thermal bridges were neglected)

And where the Latent load is: ���� = ���� �� + �������� �� (Table 11)

Where: ���� �� – Ventilation  Not considered for All air systems

�������� �� - Internal loads ( Table 10)

Starting with the calculations, we need to input the weather, the comfort, and basic parameters, as the air flow change rate (Table 4).

To reach the air flow change rate, we must use the norm UNI10339 parameters (Table 5 ) and use our area inputs (Figure 79 ).

Sports Hall Areas Description and Entrances walls dimensions. Source:

To proceed with the calculations, we must set our simplification approach for the lump sum (Figure 80) , approximating our elliptical shape to a shoebox and making an average of the materials properties (Table 6) presented.

Lump sum approach

We will do a weighted envelope materials average, according to materials areas and projecting the ellipse in a shoe box

Roof Slab

A = 7346 sqm

U = 0.25 W/sqm.K

Wall

At = 4646 sqm

U = 1.22 W/sqm.K

Roof Lights (ETFE+Glass cover)

A = 12298 sqm

U = 1.70 W/sqm.K

Going further, we set the conditions for our envelope (notice that we are using only curtain walls in the limits) (Table 7).

The next step now is to calculate the Latent loads for our case. We start calculating internal loads (based on the norm EN 12831) (Table 9 and Table 10) and continue on calculating these internal loads on a hour-byhour approach to reach the maximum latent load (Table 11).