IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C1 Report, 31 October 2010 Corresponding researchers: Pietro Finocchiaro finocchiaro@dream.unipa.it Bettina Nocke bettina@dream.unipa.it Marco Beccali marco.beccali@dream.unipa.it Relevant publications [170] Beccali M., Finocchiaro P., Sorce M. – “Optimisation of Solar Desiccant Cooling Systems for applications in the Mediterranean Climate: design and control issues” - International Conference Solar Air-Conditioning – OTTI Kloster Banz - 05.10.2005 [171] Beccali M., Finocchiaro P., Nocke B. – “Solar desiccant cooling systems with hybrid Air-PV solar collectors for applications in the Mediterranean climate” - 61 st ATI National Congress – International Session “Solar Heating and Cooling” – pagg. 75-79 - Perugia 14.09.2006 [172] Beccali M., Finocchiaro P., Nocke B., Gioria S., “Solar desiccant cooling AHU coupled with chilled ceiling: description of a new installation at DREAM in Palermo”, Proceedings of the OTTI Conference Solar Air Conditioning, Tarragona (E), October 18th -19th., 2007, pp 389-394, ISBN 978-3-934681-61-3 [173] Beccali M., Finocchiaro P.; Luna M, Nocke B. “Un impianto di Solar Desiccant Cooling a Palermo. Programma di ricerca e primi risultati sperimentali”, Convegno AICARR Padova “Riduzione dei fabbisogni, recupero di efficienza e fonti rinnovabili per il risparmio energetico nel settore residenziale”, 5 Giugno 2008 [174] Beccali M, Finocchiaro P., Luna M, Nocke B. “Monitoraggio di un impianto di solar desiccant cooling a Palermo. Primi risultati e progetto dei test”. 63° Convegno ATI. Palermo, 23-26 Settembre 2008, pp. 07.024 [175] Beccali M., Finocchiaro P., Luna M., Nocke B. “Monitoring of a solar desiccant cooling system in Palermo (Italy). First results and test planning”. Intern. Conference EUROSUN 2008. Lisbona. 7-10 Oct 2008. (pp. 316-317). [176] Beccali M., Finocchiaro P., Nocke B. “Energy and economic assessment of desiccant cooling systems coupled with single glazed air and hybrid PV/thermal solar collectors for applications in hot and humid climate” Solar Energy Elsevier 2009 DEC system with wet heat exchanger (contributed by Pietro Finocchiaro, DREAM, University of Palermo) With the aim to increase the cooling effect due to water evaporation in the return air flow rate, standards DEC configuration can be modified replacing the heat recovery wheel (sensible heat exchanger) with one or more plate heat exchangers in series with continuous humidification of the secondary flow. The wet heat exchanger used is similar to a closed loop wet cooling tower and consists of a cross flow flat plate heat exchanger, spray nozzles, basin and recirculation pump. Spray nozzles used operate with low water pressure and do not require special maintenance. In the following figure a two-stage system is presented. In the configuration shown, return air is humidified in two steps and leaves the AHU after the heat exchange with supply air stream. In addition, desiccant wheel is regenerated by external air, which is heated before by the two heating coils. This means an additional fan, but at the same time, regeneration air flow can be reduced and no bypass is used (see following scheme). The exclusion of the by-pass across the desiccant rotor and the use of outside air for regenerating the desiccant rotor, can improve performances of the system also in terms of thermal COP and reduction on electricity consumption for the regeneration. First experimental investigations confirm good performances of the system equipped with wet heat exchangers. Thanks to the optimization of the indirect evaporative cooling process, the contribution of auxiliary cooling coils can strongly reduced. page 63
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C1 Report, 31 October 2010 Furthermore, the use of the plate heat exchanger eliminate the moisture carryover that can occur in the rotative heat exchanger normally used in DEC systems. The risk of fouling (limescale) in the wet heat exchangers has to be taken in consideration during the design phase. page 64
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<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion Subtask C1 Report, 31 October 2010<br />
Furthermore, the use of the pl<strong>at</strong>e he<strong>at</strong> exchanger elimin<strong>at</strong>e the moisture carryover th<strong>at</strong> can<br />
occur in the rot<strong>at</strong>ive he<strong>at</strong> exchanger normally used in DEC systems.<br />
The risk of fouling (limescale) in the wet he<strong>at</strong> exchangers has to be taken in consider<strong>at</strong>ion<br />
during the design phase.<br />
page 64
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