eprintid: 8728 rev_number: 14 eprint_status: archive userid: 1903 dir: disk0/00/00/87/28 datestamp: 2011-09-29 09:57:29 lastmod: 2015-11-30 08:30:54 status_changed: 2011-09-29 09:57:29 type: article metadata_visibility: show item_issues_count: 0 creators_name: Valiño López, Vanesa creators_name: Perdigones Borderias, Alicia creators_name: García Fernández, José Luis creators_name: Luna Sánchez, Luis title: Experimental evaluation of a radiant heated floor coupled to an air-to-water heat pump for the cooling of greenhouses publisher: INIA rights: by-nc-nd ispublished: pub subjects: agricultura full_text_status: public keywords: air temperature difference; cooling strategies; heat pump performance modelling; power consumption 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. date_type: published date: 2010 publication: Spanish Journal of Agricultural Research volume: 8 number: 3 pagerange: 580-591 id_number: 10.5424/sjar/2010083-1253 institution: Agricola department: Ingenieria_Rural refereed: TRUE issn: 1695-971X official_url: http://revistas.inia.es/index.php/sjar/article/view/1253 citation: 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 . document_url: http://oa.upm.es/8728/1/INVE_MEM_2010_86098.pdf