LATENT HEAT OF WATER FOR COOLING AND DEHUMIDIFYING VENTILATION IN GREENHOUSES

Design standards for both the fog and fan cooling system and a newly developed dehumidifying ventilation system are discussed.

In order to determine ventilation rates and supplementary evaporation rates for the fog and fan system in greenhouses, VETH-curves method will be proposed.
The VETH-curves are derived from enthalpy calculation under three conditions; outdoor climatic conditions, inside net radiation and ventilation rates.

An example of design and its criteria are also presented for a dehumidifying ventilation system, which has been developed for preventing condensation in greenhouses without any excessive heating but using latent and sensible heats contained in the interior air.

Symposium on Potential Productivity in Protected Cultivation

Y. Mihara, M. Hayashi

https://doi.org/10.17660/ActaHortic.1978.87.35