Ventilation and Air-Conditioning

Efficient ventilation, air-conditioning and refrigeration technology makes a decisive contribution to the energetic optimization of buildings and industrial processes. Our work focuses on component development in the refrigeration circuit, the use of natural refrigerants such as propane, the optimization of heat exchangers and energy-efficient ventilation concepts for residential and office buildings.


Refrigeration Technology and Natural Refrigerants


Heat Exchangers


Ventilation of Apartments und Offices



In order to operate buildings, we have to reduce energy requirements and then cover these as far as possible with renewable energies in a cost-, energy- and resource-efficient manner. This is where our work in the field of efficient ventilation, air conditioning and refrigeration technology comes in.

Heat pumps are our main focus for the heat supply of buildings. We offer the entire value-added chain for this technology: from component development in the refrigeration circuit, through equipment and system development, to quality assurance in real operation. The focus is on the optimization of heat exchangers and the use of climate-friendly and natural refrigerants, such as propane.

Our focus in the field of heat exchanger development is the targeted identification of structure/material and coating combinations depending on the system requirements. This enables us to identify new potentials for material savings and COP (Coefficient of Performance) increase for aligned 3D structures (fibers, wires, fabrics). In addition, a suitable combination of hydrophilic/hydrophobic surface coating can be used to prevent condensate blocking and reduce ice formation when used as evaporators.

We place a special focus on the development and evaluation of comfort-oriented and energy-efficient ventilation for residential and office buildings. For this purpose, air quality, air temperature and air humidity as well as their spatial distribution must be combined with efficient heat recovery concepts and suitable flow control. Energetic aspects are considered as well as the evaluation of indoor air quality with regard to comfort and user behavior.

The provision of fresh supply air for residents and users that is adjusted in terms of temperature and humidity as well as highly efficient heat recovery are further focal points of our work.

The energetic evaluation is based on simulations and experimental characterization. This also enables us to develop and evaluate new types of heat exchangers. When it comes to dehumidification, we use our extensive expertise in the development, characterization and processing of sorption materials.

Selected Research Projects



Cost Reduction and Market Acceleration for Viable Nearly Zero-Energy Buildings


LowEx-Stock Analysis

LowEx-Concepts for the Heat Supply of Existing Multi-Family Houses


Thermal Fabric

Technological Design and Thermal Fluid Dynamic Characterization of Wire Fabric-Based Micro Heat Exchangers with High Performance Potential



Heat Exchanger Development – Design and Experimental Performance Test of Heat Exchanger Bundles with Wire Structures

Lena Schnabel

Contact Press / Media

Dr.-Ing. Lena Schnabel

Ventilation and Air-Conditioning

Fraunhofer ISE
Heidenhofstr. 2
79110 Freiburg

Phone +49 761 4588-5412

Stefan Henninger

Contact Press / Media

Dr. Stefan Henninger

Ventilation and Air-Conditioning

Fraunhofer ISE
Heidenhofstr. 2
79110 Freiburg

Phone +49 761 4588-5104

In addition to our research and development in the field of ventilation and air-conditioning technology, we offer our customers our technical expertise in the testing and characterization of devices and components for use in heating and cooling technology:

Center for Heating and Cooling Technologies