Bachler in Gröbming, Austria

Description of the application

The system is used for office cooling and heating and hot water preparation. The solar thermal system also heats up a swimming pool during summer time.

General description of the system

Closed cycle absorption with ammonia/water as working pair. The system has biomass as auxiliary heating for heating and for the absorption machine.
The building is an office building for a HVAC company with 700 m² cooled office area. The peak cooling load of the building is 9 kW and the building is cooled via concrete core activation.
The building has mechanical building ventilation with heat recovery.
The heat rejection is wet, open EWK Axima refrigeratoin with 25 kW.

Central air-conditioning unit


closed cycle

Nominal capacity

9 kWcold

Type of closed system


Brand of chiller unit

PINK chillii PSC 9

Chilled water application

chilled ceilings



Heat rejection system

wet open

Solar thermal

Collector type


Brand of collector

From the company “Neuma-Solar” in Kremsmünster, Austria

Collector area

46 m2 aperture

Tilt angle, orientation

45°, south

Collector fluid


Typical operation temperature

80 °C (driving heat for cooling application)


The solar collectors are partly mounted on the ground, partly installed on the façade of the building. The system is operated with a variable flow control.


Heat storage

3x4.5 m3 water

Cold storage


Auxiliary heating support

biomass 150 kW

Use of auxiliary heating system

space heating in winter, heating & cooling

Auxiliary chiller


System performance

The absorption chiller has a COP of 0.64.

General information

Type of building  Office building
Location  Gröbming, Austria
In operation since  2007
System operated by  Bachler HVAC company (own office building)
Air-conditioned area  700 m2
Capacity  9 kWcold


Collector area
Caption 1
Schema of the system
Collector area
Chiller unit
Schema of the system

Clicking an image opens the gallery view.

Specific information

Further specific information about the system are included in the filled in technical questionnaire.


391 K


For more information on the project please feel free to contact:

Charlotta Winkler