Figure 50 Heat gains breakdown aerogel wall

Figure 49 Heat gains breakdown aerogel wall

From the figures above it can be seen that heat gains from sun (as direct and indirect

solar) and through fabric were almost eliminated. In the base model it added up to 20%

while after improvements it is only 3% while total heat gains were reduced. That means

our building fabric and installed shading device are working great together. Windows

reduce heat gains from the sun as well as through conduction in the fabric. However,

there is no significant difference in the tested wall materials either cavity wall with uvalue of 1.7 W/m2K or it is wall with aerogel and u-value of 0.9 W/m2K, hence there is no

point in investing in the aerogel wall and that money could be used to reduce internal

heat gains. Moreover, alternative material for roof could also be considered to reduce

capital cost.

3.1.1 Internal heat gains

Internal heat gains are the main contributor in both base and final cases of our model,

they contributed to around 60% of total heat gains at the beginning, while in the

improved model heat it increased to 70% after other gains were reduced. Knowing that

they consist of gains from lighting, equipment and people, smart use of efficient

equipment should be one of priorities to reduce heat gains. Smart use of equipment

includes turning it off when it is not used, set short automatic stand by time for

computers. Investment in efficient equipment would help to reduce both heating gains

1st January - 31st December %