Zur Startseite

Cooperation with Hartmann food technology

The quality standards in Russia are gradually reaching European levels. Hartmann food technology from Nienburg has years of experience in the Russian market. As a general contractor in Russia Hartmann has always focused on quality and selected its products accordingly...

Under Floor Exhaust Extraction - Myths and Facts

Under Floor Exhaust Extraction - Myths and Facts

Again and again we experience that, in technical discussions with colleagues and other industry insiders, utterly false or misleading statements regarding the function and effect of a under floor exhaust extraction are made...

Leaky stable doors

Leaky stable doors

Unfortunately we always come across leaky section doors when we do our checks in the stables.

So we would like to point out once more...

Energy Costs in Pig Farming

Energy Costs in Pig Farming

The ever rising energy prices are causing several managers to "screen" their businesses:

where is my operation? are my energy costs too high? or is everything OK?

New perforated Panels

New perforated Panels

The further development of the well-known hard foam supply air perforated panel led to the innovation of a new perforated panel which is made ​​of EPS foam with NANO technology


Heat Recovery Systems for Agricultural Companies


Constant rising energy costs are forcing us now more than ever to be cost conscious. The heat loss in a stable with proper insulation is approximately 15%. 85% is lost through the ventilation system. This is exactly where the potential for saving lies. The total energy costs (heat and electricity) for systems with heat recovery are an average of 50% under those of conventional systems.  In most cases alternative energy sources such as burning wood chips or pellets etc. is not economical. Here the investment costs are much higher than a heat recovery system.

In new facilities the investment is recouped after about two years; with retrofitting about four years. Another reason for installing a heat recovery system is better  air quality which is attained. Due to substantially higher supply air temperatures during the winter months, higher minimum airflow rates can be reached. Furthermore, temperature fluctuation during transitional periods are reduced and the animals health is improved.

hdt Luft Luft Wärmetauscher

Air-air heat exchangers are able to recover this seemingly lost energy and are currently at efficiencies between 20 and 85% depending on the system. Our hdt eddy current air-air heat exchanger has reached top values of 85%.

The basic principles behind the operation of an air-air heat exchanger are quite obvious. Physically separated incoming and outgoing air flows past each other in
counter-current through extremely thin, thermally conductive chambers or

Since the air masses (because of basic physical laws of thermodynamics) want to balance out, the warmer air mass strives to
deliver energy, while the colder air mass wants to absorb this energy

Due to the cooling or heating of the exchanger material and the associated temperature transfer between these two air masses, an energy balance occurs. The exhaust air is cooled while the supply air is

Here you can download a summary about heat recovery.

A heat recovery system must be carefully designed and built. It is not enough to just install a heat exchanger. One essential point for flawless operation of a heat recovery system heat exchanger is regulation. Our climate control computer can be optimally adapted to the stable
specific conditions. All components are coordinated with another and are controlled automatically. It is also important that the entire exhaust air system, the heating strategy, and the type of air supply system are coordinate.
A result can only be reached through concrete planning of reachable goals.

In recent years, our central computers have been continuously developed to provide the necessary control functions to ensure optimal heat recovery.

Performance on the Job

For us, theoretical numbers don't count - only measurements and facts!

Practical example winter operation: These pictures were sent to us in Dec. 2010 by one of our customers. They show his stable and the display of his hdt controller, at 21.3 ° C a temperature increase without heating, but with heat from the exhaust air. The advantages for section heating should be clear to every manager

Practical example change of seasons: Computer analysis of our systems in a final fattening stable over 48 hrs. Here the temperature fluctuations in the supply air was reduced by 13 ° C. The advantages for animal health should be clear to every manager.

Installation Diagram and Charts

The overall system in a facility determines the effectiveness of a heat recovery system. All components have to fit together. The heat needs to go to the animals that need heat an not to the animals that don't need heat.

With a heat recovery system the different air masses must be coordinated. This requires detailed planning of the system. This requires a controller that can regulate these details.

In the following charts you can see the installation in a central exhaust system with three exhaust ventilators.

The design of the air-air heat exchanger is very critical to the efficiency of the overall system

files/inhaltbilder/galerien/Aktuell 2013/Video Waermerueckgewinnung/Videobild Waermerueckgewinnung.jpg

Video vom: 20.02.13

Wärmerückgewinnung beim

» zum Video

Zum Video: Befeuchtungskühlung

Video vom: 03.01.11

Luedecke Plan...

» zum Video


Zum Video: Klimasteuerung

Video vom: 09.02.10

Twinrohrheizung im

» zum Video

Zum Video: Klimasteuerung

Video vom: 30.08.08

Zuluft- und Abluftkanal
mit Wärmetauscher...

»zum Video

Zum Video: Klimasteuerung

Video vom: 28.07.09

Familie Maathuis - Umbau
und Neubau Ferkel- und
Sauenstall mit

»zum Video

Zum Video: Klimasteuerung

Video vom: 02.03.09

Unsere Wärmetauscher
der neuen Generation in
der Produktion...

»zum Video

Zum Video: hdt-Wirbelstromtauscher

Video vom: 28.10.11


»zum Video

Zum Video: hdt-Wärmetauscher

Video vom: 03.11.11

hdt-Wärmetauscher vor

»zum Video

Zum Video: hdt-Wärmestromverfahren

Video vom: 15.11.11


»zum Video

Zum Video: Klimasteuerung

Video vom: 25.06.10


» zum Video

Interessantes zum Thema aus dem hdt -Online Archiv


weitere Werte: Leistungen hdt-Wärmetauscher
Verkehrte Welt: Im Winter ist Frühjahr in Ställen mit unseren Wärmetauschern !