Bregenzerwald (Austria) - New passive house buildings, residential complex with 43 parties
Passive houses efficiently supplied: eXergiemaschine and smart system controller for optimum heat output
- Commissioning: 2022
- Design per building:
- HT storage/ NT storage
- eXergiemaschine Industry
- varmeco fresh water heater
- varmeco solar station
- VarCon380 system controller
The residential complex built by Morscher Bau- und Projektmanagement GmbH consists of four new passive houses with a total living space of around 3,200 m². A 10 kW eXergiemaschine and a VarCon380 system controller optimize the heating technology of the buildings, which are each supplied by a geothermal probe heat pump and solar system. Each house also has a high-temperature and a low-temperature heat storage tank, a module for connecting the solar thermal system and a domestic hot water heater.
The eXergiemaschine raises part of the energy supplied by the heat pump from 35 degrees to over 60 degrees. This not only makes the provision of hot water more effective, but also enables the heating heat pump and the solar thermal system to work more efficiently, as both benefit from a cooler return flow. Thanks to the VarCon380 system controller, the heating system can be monitored and programmed remotely.
Frequently asked, simply explained
From a physical point of view, energy is always conserved. However, it consists of usable parts, the exergy, and not directly usable parts, the so-called anergy.
Energy = exergy + anergy
In technical thermodynamics, exergy refers to the part of the energy that can perform work. In heating technology, exergy is the part that leads to heat flows due to the higher temperature level and thus makes space heating and domestic hot water heating possible in the first place.
Exergy, the proportion of energy that determines whether heat is usable, must be given greater focus. After all, exergy optimization is the key to system efficiency.
If the different temperature ranges of a well-stratified water storage tank are completely mixed, the water ends up with a uniform average temperature.
The energy content of the storage tank remains unchanged. During this process, the hot water transfers its heat to the colder water. This means that the exergy that existed at the higher temperature level compared to the average temperature and was required, for example, for
which would be necessary to heat drinking water, has disappeared, irretrievably, irreversibly. Exergy has become anergy. Anergy is energy that can no longer be used (without a new supply of energy). Only by using auxiliary means (e.g. electricity) can it be used again.
exergy arise.
In contrast to energy, exergy can therefore be reduced or even completely destroyed.
The varmeco fresh water technology uses instantaneous water heaters to heat domestic hot water only when required, eliminating the need to store it in a domestic hot water tank and inhibiting the growth of germs (e.g. legionella). The integrated VarCon211 controller only activates the charging pump when drinking water is required, which saves energy and ensures hygiene at the same time.
Thanks to the separation of heating and domestic hot water and adaptive control, the system adapts optimally to daily requirements. The circulation pump control keeps the domestic hot water at the right temperature and prevents the proliferation of legionella bacteria, ensuring a high level of hot water comfort and safety.
The eXergiemaschine recycles waste heat that escapes unused in many businesses and turns it into usable heat. It raises the temperature of the waste heat to a usable level and simultaneously cools the lower part of the heat storage tank, which improves the efficiency of the heat sources. This efficient use saves energy and is easy on both the wallet and the environment.
The eXergiemaschine is a special heat pump that enables high source temperatures and a wide temperature spread. This makes it an ideal partner for renewable energy systems, such as solar thermal and hybrid modules, which work more efficiently and supply more energy.
Questions? With pleasure!
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