Ventilation systems with heat and moisture recovery

Extremely economical and quiet, yet large power reserves to have the best indoor air quality even at a large party. Is of course part of the basic equipment.

Ventilation systems with heat and moisture recovery
Extremely economical and quiet, yet large power reserves to have the best indoor air quality even at a large party. Is of course part of the basic equipment.

  Download Ventilation systems PDF


For 3 decades I have observed that ventilation systems with heat recovery almost do not spread because of absurdly high prices. Here I explain why a ventilation system, which every ventilation engineer would call “The mother of oversizing”, is the most economical solution and belongs to the basic equipment of a “GEMINI next Generation” house.

00:14 AustoBau Salzburg and Wels energy saving fair first seen in 1992
00:59 Absurd surcharge for comfort ventilation at prefab house manufacturer
02:06 Residential 30-year loan calculator
02:49 Would such an upcharge list be conceivable when buying a car?
03:43 Effect of pipe diameter on electricity consumption
05:14 Air exchange and efficiency diagram
06:29 Assumed efficiencies at 100 m³/h
07:12 Sunny dry cold -5° 20% outside - 18° 40% inside with 70 m³/h
09:00 Cloudy humid 2° 80% outside - 18° 40% inside with 70 m³/h
10:14 Sunny dry cold -5° 20% outside - 22° 50% inside with 100 m³/h
11:28 Cloudy humid 2° 80% outside - 22° 50% inside with 100 m³/h
11:41 Sunny dry cold -5° 20% outside - 25° 50% inside with 100 m³/h
13:29 Cloudy humid 2° 80% outside - 25° 50% inside with 100 m³/h
13:46 CO2 chart for 2 people, 165 m³, 0, 20, 50, 100, 200, 500 m³/h
15:21 CO2 diagram for 6 people
15:36 CO2 diagram for 16 people
16:37 Remove cover, behind it connections power and RS485 Modbus
16:57 USB to RS485 adapter for connection to smart home computer
17:48 Blower door test common for passive houses
18:24 Ventilation system in normal operation
18:40 Ventilation system as Blower door Test: much pressure difference, the house is tight
18:56 Very little pressure difference only: the house is leaking
19:13 Unwanted air exchange through leaks
19:52 Air risk defense mode: in case of nuclear accident and radioactive cloud
21:28 Behind the service door
22:55 End

Music: Andy Mangele

GEMINI next Generation - energy + food + living comfort GEMINI next Generation - energy + food + living comfort
What can housing cost? Where can you build? How much Energy should a house produce? How much building material is needed? GEMINI n.G. is looking for completely new answers to these questions.


Prehistory of the GEMINI next Generation project
It started in autumn 1991 with the GEMINI habitable solar power plant, 2011 with the initiative Solar Building Land and 2018 with GEMINI 66 - we build our house ourselves.


Where can and should GEMINI next Generation be built? Where can and should GEMINI next Generation be built?
Using existing land better and building where conventional houses cannot or are not allowed is an important objective of the GEMINI next Generation project.


How much energy should a house generate? How much energy should a house generate?
As much as possible! Because we need to get out of oil, coal, biofuel, natural gas and uranium. Our houses should contribute as much as possible.


Project GEMINI next Generation 2019 Project GEMINI next Generation 2019
Security, Production hall near Bleiburg, Study Jordan, Flyer for lectures 2020, Cyclist vs commuter, Press release December,



Project GEMINI next Generation 2020 Project GEMINI next Generation 2020
ORF Salzburg, Lecture, , No. thanks!, Food, Electricity Distribution 2.0, RE unleashed, From the factory,



Project GEMINI next Generation 2021
*, Rethinking cities, *, Rethinking energy transition, Summer/Winter, Energy Social Food transition, *, Material test, 100% solar?, Heat pump, Disruption, Optic,



Project GEMINI next Generation 2022
Housing counseling, Cheaper than rental apartment,





  Project GEMINI next Generation 2021


*, Rethinking cities, *, Rethinking energy transition, Summer/Winter, Energy Social Food transition, *, Material test, 100% solar?, Heat pump, Disruption, Optic,

The heat pumps have arrived The heat pumps have arrived
On December 16, 2020 paid, on January 27 the ship arrived in the Slovenian port of Koper. On February 19, the 3 heat pumps could be picked up at a forwarding agency near Salzburg.


Rethinking cities Rethinking cities
The Green parliamentary group in the German Bundestag is hosting the online conference “Rethinking Cities” on March 19, 2021. We are participating in the virtual exhibition.


The LiFePo4 batteries have arrived The LiFePo4 batteries have arrived
Ordered in mid-December, arrived on March 19. Low costs for electricity storage are a decisive factor for a real energy transition.


Rethinking the energy transition: The price lie Rethinking the energy transition: The price lie
The demand for “more money for climate protection” is based on the price lie. But we need more motivation, credit and opportunity for a real effective energy transition.


Summer / winter balancing of solar power - seasonal storage Summer / winter balancing of solar power - seasonal storage
Different approaches to summer/winter balancing compared. Seven different locations, from Oslo to Cairo, are examined for seasonal balancing.


Energy change - Food change - Social change Energy change - Food change - Social change
Everyone is only talking about the energy transition for climate protection, but we also need a change in food production and in the social sphere. A solution for all 3 changes.


Ventilation system with heat and moisture recovery Ventilation system with heat and moisture recovery
On May 13, the last of the ordered units is ready for pickup at a forwarding company. The trip was nearly for nothing, because the device only barely fit through the tailgate.


DIY test of thermal insulation of an alternative building material DIY test of thermal insulation of an alternative building material
Construction wood prices are rising dramatically spring 2021 and there are supply problems. But wood prices for other applications, such as this material, are falling slightly.


Would Germany be possible with 100% solar electricity? Would Germany be possible with 100% solar electricity?
The expansion of wind energy is faltering. Is wind energy really indispensable for the energy transition or would it even work with exclusively 100% solar power?


More efficiency in heating, cooling and hot water by 3 new patents More efficiency in heating, cooling and hot water by 3 new patents
How can you achieve a higher COP with an air-source heat pump than with a ground-source heat pump, and how can you drastically reduce the amount of electricity needed to heat water?


Disruption at houses Disruption at houses
The market for homes is in as horrifying a state as the electric car market was in 2003: in the year Tesla was founded, the Peugeot 106 was a top electric car.


A visual misunderstanding, A visual misunderstanding,
or how a house shrank to 2/3 of its size. Because of this visual misunderstanding, the video “Disruption in Houses” was published again with improved graphics.