The Potential of Sky Radiation for Humidity Control

[+] Author and Article Information
Zachary Springer

University of Louisville, Louisville, KY, USA

M. Keith Sharp

University of Louisville, Louisville, KY, USA

1Corresponding author.

ASME doi:10.1115/1.4042452 History: Received September 11, 2017; Revised December 19, 2018


The potential of sky radiation (SR) to serve the latent space cooling loads was evaluated. Using ASHRAE standard 55 comfort limits (room temperature 22oC, relative humidity 60%, dew-point temperature 13.9oC), condensation was the chosen mechanism for humidity reduction. Typical meteorological year (TMY3) weather data was used for eleven ASHRAE climate zones. Three values of load-to-radiator ratio LRR (infiltration/ventilation volume flow rate times the ratio of building floor area to radiator area) were evaluated: 0.35, 3.5 and 35 m/hr. Three thermal storage cases were considered: 1. Annual cooling potential, 2. Diurnal storage, and 3. Minimum storage capacity to serve the entire annual load. Six SR temperatures Trad = 13.9 to -26.1oC were tested. Even in the most challenging climates, annual SR potential exceeded the total sensible and latent cooling load, at least for the lowest LRR and highest Trad. For diurnal storage, SR served less than 20% of the load in the hot and humid southeast, but the entire load in the mountain west. The minimum storage capacity to meet the entire annual load decreased with decreasing LRR and decreasing Trad. For the southeast, large capacity was required, but for Louisville, for instance, sufficient capacity was provided by 0.05 m3 of water per m2 of floor area for LRR = 0.35 m/hr. These results demonstrate that for much of the US, sky radiation has the potential to serve the entire annual sensible and latent cooling load.

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