Energy consumption modelling - ADU-RES

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6 CREST Seawater PV-RO Photovoltaic array Inverter Controller Inverter Induction motor Induction motor “Seawater” intake Plunger pump Moineau pump Clark pump Figure 11 – General Arrangement – CREST Seawater PV -RO RO membranes Concentrate discharge Tank Fresh water product ADU–RES WP6 Deliverable 6.1 Page 42 of 69
6.1 System details The CREST seawater PV-RO system 15 has no batteries. Its operation was demonstrated in Loughborough, UK, for two days in 2003. Loughborough is far from the sea, has no shortage of fresh water and has only a modest solar resource. The modelling presented here assumes that the system is operating in a more appropriate location, in particular Eritrea. Also, it is equipped with a 2.4 kWpeak PV array and two 6-pole motors; these details were different in the Loughborough demonstration. RO operational parameters Product flow 33 L/h to 460 L/h Recovery Ratio 10 % to 38 % Feed flow 330 L/h to 1280 L/h Feed water Composition Straight NaCl solution Concentration 35 000 mg/L, which is isosmotic with seawater at around 38,000 mg/L. …Osmotic pressure ~ 28 bar Feed temperature 17 °C to 33 °C Solar radiation Hourly data Meteonorm for Massawa, Eritrea http://www.meteotest.ch/ Inclination 17° with single-axis solar-trajectory tracking Annual average 7.8 kWh/m 2 /d Ambient temperature (for PV) Hourly data Meteonorm for Massawa, Eritrea http://www.meteotest.ch/ 15 Thomson, Murray (2004). Reverse-Osmosis Desalination of Seawater Powered by Photovoltaics Without Batteries, PhD, University of Loughborough, UK. http://www-staff.lboro.ac.uk/~elmt/Thesis.htm ADU–RES WP6 Deliverable 6.1 Page 43 of 69
Page 1 and 2: INCO-CT-2004-509093 ADU-RES Co-ordi
Page 3 and 4: Contents 1 Introduction............
Page 5 and 6: 2 Energy in RO systems This section
Page 7 and 8: 2.5 Membrane losses Energy losses i
Page 9 and 10: Electricity Seawater Motor Pump Pel
Page 11 and 12: 3 Modelling methodology The softwar
Page 13 and 14: 3.5 Charge controllers Charge contr
Page 15 and 16: 3.15 Filter and pipe losses Pressur
Page 17 and 18: 4.1 Assumed details The details giv
Page 19 and 20: Motor (for plunger pump) Type 4-pol
Page 21 and 22: 4.2 The completed model Irradiance
Page 23 and 24: The contents of the individual comp
Page 25 and 26: Discussion The Sankey diagram of Fi
Page 27 and 28: overall energy consumption. Notice
Page 29 and 30: Sankey diagram 9.19 PV 2.41 0.87 5.
Page 31 and 32: 5 CRES Seawater PV-Wind-RO, Lavrio,
Page 33 and 34: Wind speed Annual average 6.7 m/s S
Page 35 and 36: Assume efficiency curve from: Manuf
Page 37 and 38: Assume mechanical efficiency simila
Page 39 and 40: Sankey diagram Wind Turbine PV 8.24
Page 41: that the losses from inverter 3 are
Page 45 and 46: Plunger pump Manufacturer CAT www.c
Page 47 and 48: • Series connection of the PV arr
Page 49 and 50: Discussion The Sankey diagram of Fi
Page 51 and 52: 7.1 System details The CREST seawat
Page 53 and 54: Sankey diagram Wind Turbine 4.13 3.
Page 55 and 56: 8.1 Assumed details The details giv
Page 57 and 58: RO membranes Type Spiral-wound, for
Page 59 and 60: Sankey diagram PV Linear current bo
Page 61 and 62: 9 INETI Brackish PV-RO, Portugal Ph
Page 63 and 64: Photovoltaic array Nominal array po
Page 65 and 66: 9.2 Modelled performance General re
Page 67 and 68: motor’s I-V characteristic. This,
Page 69: • Use high-efficiency induction m

Energy consumption modelling - ADU-RES

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