ISHS Acta Horticulturae 719: International Symposium on Greenhouse Cooling
HEATING FLOOR AS A GREENHOUSE COOLING SYSTEM |
| Authors: | V. Valino, A. Perdigones, J.L. Garcia, L. Luna, S. de la Plaza |
| Keywords: | greenhouse, climate, heating floor, cooling |
| Abstract:
Despite the fact that heating the floor is actually used in greenhouse heating, aim of this study was to test this technology as a cooling method. The greenhouse used in this work was equipped with a heated concrete floor. A heat pump was arranged so that it removed the energy necessary to cool water inside the pipes (10-15 ºC). Two thermal control situations were studied through the summer of 2005: natural ventilation + shading screen and natural ventilation + shading screen + floor cooling. Sixteen days in each situation were selected from the available data to calculate an average day with active cooling and an average day without it. Mean values of each climate parameter were calculated in a particular interval (13 to 17 hours). Results showed that the air temperature difference between inside and outside air, with floor cooling was 1.32 ºC lower at a height of 0.5 m above the greenhouse ground (compared to the situation without floor cooling) but this value decreased to 0.62 ºC at 1.5 m above ground. The maximum cooling energy flux from the concrete floor was 57 W/m², calculated with a dynamic model. The main conclusion was that heating floor is not very efficient as a cooling system, specially taking into account its cost. | |
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