Experimental evaluation of a radiant heated floor coupled to an air-to-water heat pump for the cooling of greenhouses

Valiño López, Vanesa and Perdigones Borderias, Alicia and García Fernández, José Luis and Luna Sánchez, Luis (2010). Experimental evaluation of a radiant heated floor coupled to an air-to-water heat pump for the cooling of greenhouses. "Spanish Journal of Agricultural Research", v. 8 (n. 3); pp. 580-591. ISSN 1695-971X. https://doi.org/10.5424/sjar/2010083-1253.

Description

Title: Experimental evaluation of a radiant heated floor coupled to an air-to-water heat pump for the cooling of greenhouses
Author/s:
  • Valiño López, Vanesa
  • Perdigones Borderias, Alicia
  • García Fernández, José Luis
  • Luna Sánchez, Luis
Item Type: Article
Título de Revista/Publicación: Spanish Journal of Agricultural Research
Date: 2010
ISSN: 1695-971X
Volume: 8
Subjects:
Freetext Keywords: air temperature difference; cooling strategies; heat pump performance modelling; power consumption
Faculty: E.U.I.T. Agrícolas (UPM)
Department: Ingeniería Rural [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This paper describes the experimental cooling of a greenhouse in Madrid (Spain) using a radiant heated floor (RHF) coupled to an air-water heat pump (HP). Two cooling scenarios were studied over the summers of 2005 and 2006: natural ventilation + a shading screen (control system), and natural ventilation + a shading screen + an RHF (concrete) coupled to an air-water heat pump (i.e., in cooling mode; nominal power, 34.1 W m–2). Using the difference between the outside and inside air temperatures, it was concluded that at 0.5 m above the floor the RHF system reduced the temperature by 1.1°C in 2005 and 0.8°C in 2006. Both cooling scenarios were compared with other cooling technologies: the use of the natural ventilation + shading + RHF gave a smaller air temperature difference than fogging at a height equal to or lower than 0.5 m. A model based on the heat pump performance curves was constructed to predict its power consumption and good predictions of the variation over the day were obtained. The power consumption of the heat pump was 104.8 Wh m–2 d–1 (from 13:00 to 18:00 h) under our test conditions in Madrid. The RHF-HP system may only be appropriate for cooling greenhouses under certain circumstances, e.g., when growing high value crops or when cost is not a limiting factor, as its initial investment cost is about € 38 m–2.

More information

Item ID: 8728
DC Identifier: http://oa.upm.es/8728/
OAI Identifier: oai:oa.upm.es:8728
DOI: 10.5424/sjar/2010083-1253
Official URL: http://revistas.inia.es/index.php/sjar/article/view/1253
Deposited by: Memoria Investigacion
Deposited on: 29 Sep 2011 09:57
Last Modified: 30 Nov 2015 08:30
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