Promitheus Building, Sol Energy Offices in Palaio Faliro, Greece

Description of the application

The closed cycle absorption cooling system is used to heat and cool the offices of the Sol Energy company.

General description of the system

The system technology is closed cycle absorption cooling system. Heat is provided by a solar thermal system and is backed-up by a ground source heat pump.

Central air-conditioning unit


closed cycle

Nominal capacity

35 kWcold

Type of closed system


Brand of chiller unit


Chilled water application

fan coils, chilled ceilings, supply air cooling, chilled floor



Heat rejection system

wet open

Solar thermal

Collector type


Brand of collector


Collector area

78.6 m2  gross

Tilt angle, orientation

35, 0 west/east

Collector fluid


Typical operation temperature

83 C (driving heat for cooling application)


Heat storage

2x180 m3 water

Cold storage

1x180 m water

Auxiliary heating support

ground souce heat pump

Use of auxiliary heating system

a geothermal heat exchanger is utilised for direct cooling of the building or as a heat rejection system for the cooling equipment

Auxiliary chiller


- type


- capacity

61.5 kWcold

System performance

This is a newly installed system, system performance has not been analyzed yet.

System reliability and overall success of the installation

The first weeks of operation have revealed a reliable system operation. No long-term monitoring data are available so far.

General information

Type of building  Offices, residential
Location  Palaio Faliro, Attiki, Greece
In operation since  2007
System operated by  Sol Energy Hellas
Air-conditioned area  360 m2
Capacity  63 kW cooling, 14 kW heating

Specific information

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


653 K


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

Vassiliki Drosou