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| 24.05.2009 |
Publication about "energy efficiency of spas" in the magazine Haus und Wellness (issue July 2008).
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| 12.04.2009 |
Zero emission spa achieved!
Our initial project objective has been achieved! Six grid connected photovoltaic modules generate 1250 kWh/a of electrical energy and produce an income of 700 €/a or 58 €/month (incl. Vat).
Thus, a cash flow of 492 €/a (700 € - 208 €) could be generated by the zero emission spa.
(calculations based on the spa's total electrical energy drawn from the grid of 1225 kWh and 208 €).
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| 10.04.2009 |
Annual electrical energy consumption of test spa was found to be 1225 kWh, producing electrical energy costs of 208 €!
Test period from 09th of April 08 to 8th of April 09 in Ingolstadt.
The test spa has been additionally insulated and operated with swimming pool absorbers. The spa was used twice a week for a bout 40 min each usage. Average spa temperature 38°C.
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| 16.10.2008 |
Interbad Stuttgart. |
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| 16. - 20.09.2008 |
Envy-Spa Team presents project results at Watkins Manufacturer Corporation in California. |
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| 25.06.2008 |
Zero Emission Spa in operation: solar heating combined with enlarged photovoltaic system (total 6 modules, 1050 Wpeak) producing 1200 kWh/a or 564 €/a! |
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| 13.06.2008 |
InterSolar, Europe's biggest solar exhibition in Munich. |
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| 11.06.2008 |
Mr. Bergmann from Delta Energy Systems joins project meeting and subsequent solar discussions. |
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| 26.05.2008 |
Mike McCague from Watkins at DemoDomo and University of Applied Sciences. |
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| 01.05.2008 |
Thermo solar system installed for spa heated (2 m² unglazed pool absorbers) and in test |
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| 14.04.2008 |
Photovoltaic system (2 modules with a total of 350 Wpeak) installed covering the yearly consumption or the highly efficient circulation pump and ozonator |
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| 25.03.2008 |
Commencement of an academic final year student project at the Ingolstadt University of Applied Sciences |
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| 19.03.2008 |
INDESIGN founder and director, Prof. Dr. Beerschwinger, presents the ENVY Award to Steven M Hammock, president of Watkins Manufacturing Corporation, the market leader in SPA manufacturing since 1977 and #1 selling brand HotSpring. More information see press release. |
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| 08.03.2008 |
Insulation Enhancement of spa reduces heat loss by a further 30% or to 5 W/K (cover hinge and seal, floating blanket, compartment door, ...) |
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| 04.03.2008 |
Grid inverters from Steca ideal for photovoltaic system of 300 W up to 3600 W are tested in our project. |
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| 22.02.2008 |
Sharp Electronics Europe agreed to deliver photovoltaic module used for the solar powered SPA prototype. |
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| 28.12.2007 |
Implementation of 8 channel test system and commencement of Test2-series. |
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| 16.01.2008 |
Additional energy monitor installed for a more detailed control and forecast of energy consumption and costs. |
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| 28.12.2007 |
Project website uploaded to new domain: www.envy-spa.de |
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| 27.12.2007 |
Implementation of 4 channel test system and commencement Test1-series. |
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| 24.12.2007 |
Spa electrically connected, filled with water 20°C and switched on at 17:00 at -5°C ambient temperature. Spa ready to use at 12:00 after 19 h of heating-up (approx. 1°C/h). |
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| 10.12.2007 |
Co-operation agreement with public utility company Stadtwerke Pforzheim providing CO2-emission-free electric energy produced from 100% water power for the project duration! |
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| 22.11.2007 |
ENVY - project start: Delivery and set-up of popular SPA-model Sovereign from Hotspring. |
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| 13.11.2007 |
Co-operation agreement with Watkins, the HotSpring manufacturer providing Spa model for energy efficiency tests! |
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