1 / 15

435 m 2 Collectors on roof of building 2

Solar powered adsorption cooling cum desalination. ME Dept., NUS. A pilot teaching facility at LF027, Building 2. A pilot AD desalination cum cooling plant for teaching and research. 435 m 2 Collectors on roof of building 2. AD working principles (KAUST/NUS patent)

more
Download Presentation

435 m 2 Collectors on roof of building 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Solar powered adsorption cooling cum desalination ME Dept., NUS A pilot teaching facility at LF027, Building 2 A pilot AD desalination cum cooling plant for teaching and research 435 m2 Collectors on roof of building 2

  2. AD working principles (KAUST/NUS patent) – based on physical sorption phenomena, batch-operated Adsorption-triggered-evaporation Desorption-activated-condensation 28-36°C 45-75°C 28-33°C 25-30°C 1 to 3 kPa 4 to 6 kPa Mesoporous adsorbent SiO3.nH2 O , 800m2/g Potable water TDS <10ppm, pH =7.3,±0.1 5 to 12 m3/tonne.day 7-28°C 12-33°C 25-33°C 55-85°C, from Solar or waste heat Cooling power, Tchilled = 7-20°C, 25- 32 Rtons/tonne Advantages: -Produce two useful effects with low-temperature heat input, -low specific energy (electric) consumption (1.38kWh/m3), -no major moving part, inexpensive materials for construction

  3. Solar energy - collectable radiation • The daily average radiation in Thuwal (KAUST) is about 22 MJ/m2.day (latitude λ=22o , sunshine hours from 9 to 13 h/day) • Estimated thermal rating is 1300 kWh/m 2.year, as compared with 925 kWh/m 2.year @ 65o C in Singapore . • Recommend to use tube collectors because (i) it is easy to handle, (ii) it reduces the dust accumulation – dust particles will slide over the tube curvature whilst those accumulated on top could be blown over by strong wind.

  4. Evacuated-tube collectors Plan view of roof Provide shading that reduces heat stress in green houses.

  5. What are the energy needs of a green house ? • Electricity- for equipment, offices, control sensors, lighting, lifts, rest rooms, solar lamps for artificial brightness control, etc. Estimated amount is 300 to 450 kW • Cooling - Green houses to reduce heat stress, cooling of water in aqua-culture tanks, offices, guest rooms, etc. Estimated average rate of heat infiltration is 165 W/m2 for green house design over a day. For a 15000 m2 floor area, the nominal cooling rate is 700 Rtons. Total is about 900 - 1000 Rtons (inclusive offices, guest houses, etc) • De-humidification -to control moisture level in parts of green houses. • Heating - for artificial hot weather control and simulation

  6. Co-generation cum solar Conventional approach DARI’s energy needs Why Co-Generation ? Primary fuel, (Town gas) Primary fuel Gas Turbines x 2 units of 700 kW Electricity from grid ( ) Electricity (- max at 1.3 MW) diesel 375 to 500oC Steam (4800 kg/h) “Kettle” Boiler (8 bar) Waste heat operated boiler (8 bar) Temperature cascaded utilization of exhaust energy with AB_AD chillers • Cooling • (7o C and 15-18 0C) • Water • (5 l/m2 .day) electricity Electrically-operated decicant dehumidifier Steam driven AB/AD chillers 125o C Conventional EUF=0.52 TriGen EUF =0.85 - Thermally-driven design

  7. ME Dept., NUS What are the design choices ?(Design method) Grid of KAUST Electric chillers (400 Rtons) CWS =7 C 500-600 kW for use in DARI 360 kW 1000 to 1200 kW 50-60 kW 20 to 25 kW AB chillers (COP 0.9 to 1.1) giving 800 to 1000 Rtons AD Chillers (COP =0.5 to 0.65) giving 120 to 150 Rtons Gas Turbines (2x 700 kW) Steam (177 C, 8.3 bar) Further waste heat recovery CWS = 9-10 C CWS = 14 to 18 C Water production 75 m /day 40 – 55 kW Solar collectors Seawater Cooling Towers (1200 Rtons) Exhaust leaving at < 125 C

  8. Sea water feeding line Sea Water Tank Pre-treatment sea water tank Prototype Lab-scale AD Plant at NUS

  9. Release Valve Condenser Collection tank Condensate drainage Reactor Bed

  10. Condenser and evaporator Cooling water system valves Sea water Silo-type adsorber-desorber beds E x haust gas 2 0 0 to 25 0 C Post treatme n t tank Hot water Waste heat recovery storage from exhaust Fresh water Pretreatment storage tank An Artist’s impression of a large AD chiller cum desalination plant for district cooling

  11. H d d Can the AD cycle scale to a commercial size ? – to work closely with industry partners of KAUST Silica gel-filled concrete silos as adsorbent beds, automated DP-operated valves, no major moving parts (patent filed) Valve close Silica gel-filled concrete silos as adsorbent beds Valve open Each tower contains up to100 tonnes of silica gel Seawater injection Chilled water produced

  12. Pictorial view of a solar-powered AD Chiller plant at a commercial building in Singapore (45 Rtons)

  13. Photo of an Absorption chiller being commissioned in Poland Thank you.

  14. Thank you

More Related