The architectural implications of adopting low exergy cooling strategy: separation of sensible and latent cooling

The Separation of Sensible and Latent Cooling Load (SSLC) is an appropriate low exergy cooling strategy for the tropical climate. The cooling process consists of two main components; the latent and sensible cooling. Latent cooling is exergy intensive where 8ͦC is used for the removal of moisture from the air by condensation. For sensible cooling only around 18ͦC for the removal of heat from the space are required. However, in conventional practice these two processes are often combined as part of an air-based cooling system. As a result 8ͦC is used for both processes resulting in a higher exergy consumption. This paper proposes the implementation of SSLC as an alternative cooling method. Alongside this, promotes the change from an air-based to a hydronic, high temperature cooling system for the delivery of sensible cooling. Furthermore, to reduce exergy losses due to the transport of dehumidified air within the building, decentralized ventilation is advocated. This work addresses potential architectural implications of employing such a strategy and the related technologies to achieve exergy efficient buildings. A series of design scenarios using a sample building shows that it is essential for the architect to consider the related system parameters in the early design stage where adjustments to the design can still be easily made.