Geothermal Air-Conditioner

A local initiative by an Estonian inventor, Heiki Jüris, invented the Geothermal Air-Conditioner. This device is in use and working. Dr. V. Viljasoo of Estonian University of Life Sciences is collaborating with Mr. Jüris on the testing of the device.

The principle is simple. Two "boxes" are built under, or in extension of the foundation of the house and connected with several sloped tubes. The device is then covered with earth, or built upon. In principle the circulation of the air through a heat pump (much like normal ground heating using a liquid to absorb the heat) the air in this device obtain the ground temperature (around 7 degrees), and returning to normal atmospheric electrostatic air and humidity before pumping it back into the house.

The Geothermal Air-Conditioner seems to be a cheap way to create a healthy air conditioning and heat for the house. It potentially takes up a less space than normal ground heating (if placed under the house), and the space can still be used for storage to some extent. The backside is that is best to include in the initial building phase (though it can be added later as well) and that it is still in (final) experimental phase. The device requires a little manual cleaning every year.

Now, this is not all advertising. The reason for entering this into my blog is that Mr. Jüris seems to be fitting my archetype of a local "alchemist". From what I am told he is a pleasant and modest person who does not do much advertise himself and his invention. He is not a scientist per se I understand (but collaborate with local ones). The principle of the device is simple, clever and cheap (mainly if put into building of a house foundation). Mr. Jüris is one of many brilliant inventors with better solutions to status quo, but chance is that his invention will suffer the same fate as most other of our solutions: little or no impact. The reason? Well, if you read about the conference in the last blog entry you might find one answer. If the focus of government, and thus the scientists (funding is needed by the governments), is on heating with biofules or wood/plant materials ("renewable energy source") then that is what people will use in the future. If the perspective is small in the leadership, and the small man (Mr. Jüris) is not raising massive public awareness on his own, I would sadly predict his invention to become a another future note in the patent office.

Interview with inventor (Estonian)

Power Point presentation of the Geothermal Air-Conditioner

Renewable Energy Sources Conference

The 15th November Estonian University of Life Sciences held their 9th coference on "Investigation and Usage of Renewable Energy Sources" in Tartu. I attended as part of the university, but mostly out of curiosity.

The conference had leading researchers in renewable energy from serveral countries and officials of the Estonian ministries. There seemed to be a strong focus on the countrys vast unused biomass and its applications. Estonia have a lot of unused agricultural land after U.S.S.R. occupation (3 hectar per inhabitant of which 200.000 hectar is abandoned), and a though they are not raping their huge resources of trees, firewood is a common heating source, and has been for hundreds of years. I could not help noticing that firewood is part of the term "renewable energy", but I did not notice references to the enviromental implications, only the economical rentability.


The goverment did, not supprisingly, bring out that they wished to focus their funding, and welcomed researchers who volunteered to state outdated or fields with too low cost-benefit. They also asked for more structured or exact research, since the last 30 years in some fields had given little clarity of the situation regarding renewable energy. On the other hand researchers gave an official plea to the goverment for guidelines to what they should do. Little news there I guess.

The Ministry of Economic Affairs and Communications gave some interesting data on the status of different renewable energies, but focused on the use of forest resources (biomass conversion, direct energy production and waste uses). I could not help raising a few questions on heat pumps. I asked if they had considered using deep sea water for heating Tallin like the plan in Stockholm? It had not been considered, but they had noticed that the last 5-10 years the sales and use of heat pumps were doubling every year in Estonia. They could not answer why most of the deep ground energy heat pumps were rejected in most cases in Estonia, but speculated it could be due to protection of ground water ressources.

I know that Tartu already has a great initiative that makes heat and ventilation to a house - basically ground heat that does not use electricity. But it is one of these initiatives that has an modest inventor with humble ambitions. So I think very few will see this technology - like others. I will write about the Geothermal Air-conditioner later.

Several fine initiatives were presented at the conference. The best in my opinion was a German initiative by Michael Wachendorf and his team, who focus on using the increasingly abandoned German farm lands. The abandonment is against EU regulations (which is worth a thought), but the farming is no longer financially sound in some areas. So in their initiative they harvest the wild plants growing and converted them into biofuel. I liked this project because it not only tries to produce sounder energy, but also invoveld a growing problem caused by a changing culture.

Estonia is third in Europe (following Lithuania and Finland) in use of renewable energy resources (including firewood) with a set goal of 5.1 % for 2010; a goal that has already been surpassed. Unfortunately this kind of statistics, I think, probably would not change the fact that Estonia is also one of the most polluting countries in EU. So I left with the feeling that the focus was on "renewable" rather that "greener" or perhaps just "sounder" energy. No leaping for Estonia, but small safe steps with the crowd.

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