Energy Requirements for the Treatment of Fresh Air in
HVAC Systems: A Case Study for Athens and Thessaloniki, Greece
K.T.
Papakostas 1 and A.M. Papadopoulos 2
1
Process Equipment Design Laboratory, Department of Mechanical Engineering,
Aristotle University Thessaloniki, 54124 Thessaloniki, Greece,
2
Laboratory of Heat Transfer and Environmental Engineering,
Department of Mechanical Engineering
Aristotle University Thessaloniki, 54124 Thessaloniki, Greece.
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Abstract
The aim of this paper is
to discuss the impact of the relation between varying indoor and outdoor
conditions on the ventilation loads of buildings and to provide HVAC
designers with the respective information needed for the optimum
dimensioning of the system.
The total load generated
by one litre per second of fresh air brought from the outside environment
to the indoor space conditions, called “ventilation load index”, is
calculated for the cities of Athens and Thessaloniki, Greece. The same
principles can be applied to other locations. Results are given in tabular
form and ventilation loads for both heating and cooling periods are
presented. The results separate the sensible and latent components of the
load in order to provide the latent to sensible ratio. Operation periods
of 8, 16 and 24 hours are considered for the air-conditioning system, in
order to distinguish between different types of buildings. Various
combinations of indoor conditions are also examined, in order to ascertain
the influence of the temperature and relative humidity on ventilation
loads. The resulting energy requirements due to the ventilation of the
building are synoptically presented in tables.
Key words: HVAC
systems, ventilation load index, energy consumption, heating, cooling,
latent energy, sensible energy.
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