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The future of the islands is Green


Applications presented (Α) 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 – 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 – cooling – 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 – section & ducts


High flow air stream removes heat loads


Inverter control of motor speed – 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 – pipe network


Expansion vessels


Pipe network collectors


Heating – 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 – cooling storage


Solar cooling

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 – 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


1Ρ 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 – 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.


Operation diagram


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 ΚWp, waste water treatment plant, Kremasti, Rhodos


PV 20 ΚWp 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 – 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

► ► ► ► ►

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


System elements


Hellenic Navy Strogyli island electrification PV installed power: 2,64 ΚWp (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 – 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


VRB batteries


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 stations’ installed – 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


Flow chart


A waste to heat layout


Plant view from a small size waste to heat plant


MSW plant in Mallorca


Control panel


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 – 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.


Thank you!

Stavros Volas BEng, MSc, Env Auditor

Island energy  

Energy saving practices proposed for the Aegean islands.

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