Civil Engineering Reference
In-Depth Information
Fig. 2.6
HVAC system based on solar cooling: absorption machine and hot water storage system
2.2.4 Solar Cooling Installation
The building has an active HVAC system based on solar energy and it is composed of
a solar collector field, a hot water storage system, a boiler and an absorption machine
with its refrigeration tower, with a total cooling power of 70kW, see Fig.
2.6
.
Moreover, Fig.
2.7
shows a scheme of the solar cooling installation, where three
main circuits can be observed: the primary, on the left, is responsible for providing
the necessary energy for the HVAC system. The secondary, on the right, is in charge
of flowing cold water (in summer) or hot water (in winter) to the different fancoil
units distributed all around the building. Finally, there is a third auxiliary circuit
which is responsible for connecting the absorption machine with the refrigeration
tower.
Under ideal conditions, the HVAC system has the following behaviour
(Pasamontes et al.
2007a
): the water flows through the solar collector field rising
its temperature. This hot water goes into the absorption machine, which refriger-
ates the water adequately, and thus, it is injected into the fancoil system with the
main objective of covering the temperature necessities of the environment where
this service is demanded.
On the other hand, and mainly as a function of environmental conditions, it could
be impossible using only the solar collector field, to heat enough the water so that
