IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… 5 Monitoring Results 5.1 Annual / Monthly Data Table 2 shows the average experimental results of the chiller analysis in the year 2007 and 2008, operating in the steady state period. Year W ch (kW) W c (kW) W g (kW) COP T dbo (ºC) 2007 5.78 9.7 15.4 0.57 27.7 2008 4.4 8,0 12.5 0.51 31.2 Table 2.- Experimental mean values of the installation in the years 2007 and 2008 5.2 Analysis of Typical Days In Fig. 3 it is shown the chiller operation temperatures for one day (11/07/2008). The operation in this day can be considered as representative for the chiller performance. The daily operation process is described as follows. At 11:30 due to the solar field temperature, the pump of the secondary circuit starts to pump water heated in the solar heat exchanger to the generator of the chiller. As soon as the temperature of this water flow overcomes 80 ºC at the generator inlet, the chiller begins to produce chilled water. The temperature difference in the heat driven of the absorption cycle is up to 7 ºC between the inlet and the outlet of the generator. The average generator power for this day is 7.9 kW. This generator power makes the evaporator outlet temperature (T ev,o ) decrease, reaching 12 ºC on this day. When the climatic conditions are the optimal ones, these values can decrease to 9 ºC. The temperature difference in the evaporator is around 2 - 3ºC, achieving a chilling capacity of 5.8 kW in the last part of the 2007 and 4.4 kW in 2008. According to the heat rejection system, the inlet temperature (T he,i ) increases when the absorption chiller operates, being its maximum value 42 ºC, coinciding with the maximum values of T g,i . Fig. 3. - Operation temperatures of the chiller and solar radiation in 11/07/2008. Because of the fact that a dry cooling tower is used to reject the waste heat of the absorption chiller, in figure 3 it can be seen that the heat rejection temperatures depend on the outdoor
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report, Date:… temperature. The influence of the ambient temperature can be seen in the Table 3 too. The average values of the most important parameters of the chiller are presented for three representative days in this table. It can be seen that the average generator power is similar during the three days, but the deviations between the chilling capacities differ up to 19%. This happens because at high values of the outdoor temperature, the capacity of the dry cooler to reject the heat of the absorption cycle to the ambient decreases. Therefore, the higher the outdoor temperature is, the lower the chilling capacity and the COP produced by the absorption chiller are. Date T dbo (ºC) T g,i (ºC) T ev,o (ºC) W ch (kW) W c (kW) W g (kW) COP 11/07/2008 35 94 12.4 4.02 12 7.9 0.48 29/07/2008 30.4 92.2 11.6 4.5 12.8 8.2 0.53 08/08/2008 29.4 91.9 9.5 4.8 13.3 8.7 0.53 Table 3.- Average values of three typical days. 5.3 Detailed Analysis The steady state performance of the chiller was analyzed. In this way figure 4 shows the influence of the outdoor temperature on the COP during 2007 and 2008 when the chiller operated in the steady state period. The COP decreases when the sink temperature increases. Both trends have the same slope, although the mean values of the year 2008 are lower because the mean ambient temperature during 2008 was higher. Fig. 4. – Influence of the outdoor temperature on the COP and in the chilling capacity 6 Experiences / Lessons Learned As it was mentioned, during this first two years, the installation worked with a dry cooler tower. The studies showed the great influence of the temperature of the heat rejection sink on the machine performance. Therefore, the substitution of the initial heat rejection system was proposed in order to improve the performance of the absorption chiller. Finally, it was decided to use a geothermal system using a water well placed in the surroundings of the solar cooling installation. With this modification the chiller operated with a constant temperature in the heat rejection sink. This temperature, according to others water wells placed near by was around 17 ºC. This water well supply water to a 25 m 3 water tank, in
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IEA Solar Heating and Cooling Progr
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IEA Solar Heating and Cooling Progr
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Endbericht Solare Kühlung und Klim
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Task 38 Solar Air-Conditioning and
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IEA SHC Task 38 Solar Air Condition
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3.1 Adsorption Systems Table 1: Ads
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4 Heat Rejection There is a number
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M M IEA SHC Task 38 Solar Air Condi
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M M M IEA SHC Task 38 Solar Air Con
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IEA SHC Task 38 Monitoring Procedur
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Table of tables Table 1 List of ele
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Page 246 and 247: IEA SHC Task 38 Solar Air Condition
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Page 262 and 263: - - - - - - - - - - -
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Page 266 and 267: Pompe évaporateur + compteur C3 Dr
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Page 270 and 271: Power (kW) 20 19 18 17 16 15 14 13
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Country Name/ Company City Applicat
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79 Spain Private House Olivares-Sev
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Questionnaire for Owners of Small-S
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Fragebogen an Besitzer solare Kühl
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Cuestionario para propietarios de i
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Questions to Package Solution Provi
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9. Maintenance o What type of maint
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Grundprinzip Solare Wärme thermisc
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Hintergrund Operating Agent: Hans-M
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- Leistungsvergleich von verfügbar
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Subtask A: Pre-engineered systems f
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Abb. 3: Das Bürogebäude in St. Sc
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Beispiele realisierter großer Syst
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a) b) c) Abb. 9: Installation eines
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Subtask C: Modelling and fundamenta
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Liste der Systeme im Monitoring von
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Liste der Systeme im Monitoring von
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Marletta, L., Evola, G. and Sicurel
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Ellehauge & Kildemoes Vestergade 48
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Tekniker Centro Tecnológico Teknik
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IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

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