The future of the islands is Green
Applications presented (Î‘) Efficiency enhancement of solar thermal Flue gasses heat recovery Air conditioning heat recovery Air cooling with fresh air Geothermal heat pumps
Applications presented (Β) Heating – cooling storage Solar cooling Tri – Quadra production Cooling & dehumidification with desiccant wheels (adsorption) Grid connected PVs Hybrid systems– energy storage Thermal power from Municipal Solid Waste (MSW) Water economizers
Efficiency enhancement of solar thermal Can be achieved by using close loop control of water flow (pump speed), to maintain optimal temperature of heating medium (water). Close loop control can maintain constant water temperature if needed (solar cooling applications). Efficiency can be increased by combining conventional and selective solar collectors.
Control panel inverter with PID control
Programmable controller of thermal solar plant with pump speed control option. It can also control auxiliary burner and return circuit water pumps for optimal performance and comfort. East â€“ west solar fields are supported.
Flue gasses heat recovery Using simple heat exchangers for temperatures higher than condensing temperature. Using condensing heat exchangers to maximize energy recovery of flue gases (for LPG or natural gas burners)
Flue gasses heat recovery condensing boiler
2 Îœcal/h heat recovery unit (maximum power output) connected to a 1,5 Mcal/h steam generator.
Air conditioning heat recovery Using metal fin cross flow heat air to air heat exchangers. Using rotary heat exchangers (rotary wheel) Using desiccant wheels (adsorption rotary wheel with silica gel)
Roof mounted heating â€“ cooling â€“ ventilation & heat recovery unit
Air cooling with fresh air Achieved by supplying large quantities of fresh, with a rate greater that 15 times the volume of the building, per hour. A desiccant wheel (adsorption rotary wheel) can be used to reduce temperature of a pre-humidified (cooled) air stream.
Fan â€“ section & ducts
High flow air stream removes heat loads
Inverter control of motor speed â€“ air flow control
Geothermal heat pumps
Heat pump external heat exchanger is realized with underground horizontal pipe networks at a 1.5 m depth (or more), or with the aim of an open or close loop borehole pair of pipes. In both cases, soil maintain constant heat exchange outside temperature, around 15 oC.
Geothermal heat pumps â€“ pipe network
Pipe network collectors
Heating â€“ cooling storage Based on storage of heating or cooling medium (e.g. water), by using insulated tanks. Normalize peak demand, and requires smaller power installed, also improves COP of heat pumps.
House with air to water heat-pump installation for heating & cooling
Heat pump with heat recovery
1500 litre thermaly insulated water tank for heating â€“ cooling storage
Based on absorption or adsorption chillers that consume thermal instead of mechanical energy. They can be combined with auxiliary thermal energy source (diesel, LPG, natural gas, biomass, waste heat, recovered heat, CHP heat).
Absorption chiller schematic diagram
House with solar cooling & heating installation
Roof â€“ solar thermal collector field
Absorption chiller & cooling tower
Thermal storage tank Stores heated water generated by the solar thermal field at 83 oC
Auxiliary diesel heater
An office building with solar cooling & Quadra production installations
Solar collector field
Hot and cold water insulated tanks
Power & automation control panels
Absorption chiller & cooling tower
Auxiliary natural gas heater & inox chimney
1Îˇ installation of SANYO Quadra production in Europe, office building, Athens
Tri-production units in Rodos Palladium hotel
Pictures from the visit of the Vice president SANYO Japan & CEO of SANYO Europe for the tri-production inauguration in Rhodos, first installation in Greece.
Rhodes Palladium Hotel, Rhodos
30 â€“ 40 RT absorption chiller
Load distribution unit
Solar thermal field (left) Heat medium collection unit 90 ÎżC (right)
Heat medium pumps (left) Hotel roof with horizontally fitted high temperature collectors (right)
Cooling & dehumidification with desiccant wheels (adsorption) Their design is based on a rotating wheel covered by a sorption medium like silica gel. This material initially removes and stores in its mass air humidity (water), and then is regenerated with the aim of a secondary hot air stream, that dries silica gel.
Typical installation (hotel)
Various types of adsorption (or desiccant) wheels
Grid connected PVs
A 5 KWp PV grid connected installation on a house complex roof
A 3 x 1500 Watt grid connected inverter with data logging (2006)
A 20 KWp grid connected PV on a houshold roof, Kremasti, Rhodos
A 20 KWp grid connected PV on a warehouse roof, horizontally fitted, Kremasti, Rhodos
PV 4 KWp, hotel building, Ixia, Rhodos
PV 8 KWp, hotel building, Rhodos
PV 20 KWp, Town Hall, Kremasti, Rhodos
PV 20 KWp, supermarket Pappou, Ixia, Rhodos
PV 20 ÎšWp, waste water treatment plant, Kremasti, Rhodos
PV 20 ÎšWp thin film, Maribel hotel, Kremasti, Rhodos
PV, Sun Beach Hotel, Ialyssos, Rhodos
Thin film PV installation, Rhodos Palladium hotel
PV 15 KWp K Butique hotel, Ixia, Rhodos
Pilot â€“ educational 0.5 KWp PV, Enviromental Educational Center, Theologos, Rhodos
Equipment - installation, Enviromental Educational Center, Theologos, Rhodos
Grid connected inverters 3 x 7 KW
Grid connected PV on a car park (Photovoltaic, Athens) Consists of: ► ► ►
81 PV panels, 3 inverters (3kW each) 1 Data Logger for power, energy generation, panel and ambient temperature, and solar irradiation
Hybrid systems– energy storage
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Multi source energy generation systems Water desalination powered by hybrid systems Energy storage Energy storage in hybrid cars (plug in cars) RES – electrolysis and energy storage in hydrogen
Eco house, stand alone PV assisted by LPG gen-set, Rhodos
Hellenic Navy Strogyli island electrification PV installed power: 2,64 ÎšWp (Photovoltaic)
A reverse osmosis water desalination plant supplied by PV & Wind turbine hybrid stand alone system (Photovoltaic)
Hydraulic energy storage (two lake system)
Compressed air electricity storage application
Compressed air storage chamber
290 MW compressed air energy storage plant
Energy storage in Na â€“ Sulfur (NAS) batteries
Wind power pilot installation with energy storage
Wind power installation with energy storage
Wind power installation with energy storage (BOS)
PV park of 5 MWp with energy storage
2 tank electrolyte system, a characteristic of VRB battery
King Island case
System upgrade: addition of an energy storage unit
VRB Energy storage unit images
Wind park with energy storage in VRB (vanadium redox batteries)
Energy storage in Hokkaido
Kythnos hybrid system case
Phases of system evolution
Kythnos hybrid system in 1983
System upgrade in 2001
Comparison of power stationsâ€™ installed â€“ vehicle installed power in Europe
Plug-in vehicles & grid integration
Plug-in hybrid car
Commercial vehicle with plug-in option
Hydrogen energy storage
Energy storage with electrolytic hydrogen generation
Hydrogen application images, showing clearly the future
A nice energy storage illustration
Scientific interest for energy storage is escalating
IRES II, World Conference Center, Bonn, 2007
Thermal power from Municipal Solid Waste (MSW) MSW is a invaluable thermal energy source, as incineration or pyrolysis recovers energy stored in the organic mass in a form of chemical energy after natural processes like photosynthesis or industrial and chemical processes (e.g plastics).
Waste to heat MSW incineration plant
A waste to heat layout
Plant view from a small size waste to heat plant
MSW plant in Mallorca
Inspection window of furnace
Flue gasses measuring & monitoring unit
Chemical analysis laboratory
Waste separation unit
Anaerobic digestion of organic content of waste
Anaerobic digestion unit
Fermentation â€“ biogas storage vessel
Schematic of gasification unit
Water economizers Low Purchase and installation cost , based on very simple design.
Operation principle is based on mixing water with air. Though technology involved is quite simple, environmental and financial benefits are very significant.
They reduce actual water flow by 50% to 70% Total water consumption is reduced by 30% to 60%
They reduce the installed power and energy consumption of boiler They increase the energy contribution of existing solar thermal plants They reduce energy consumption of fossil fuels.
They reduce waste water treatment plant loads. They eliminate emptying of waste water buffer and sink. They reduce energy consumption of water pressure pumps.
They reduce water pumping from boreholes. They reduce consumption of precious clean water. They enable escalating and decent water consumption invoicing of water utilities, as cost per capita is reduced.
Stavros Volas BEng, MSc, Env Auditor