CNRS PROMES Research Center Office, Perpignan, France

Description of the application

The targeted building welcoming the solar cooling application is the CNRS PROMES research center office. It is dedicated to research works and offices in the technical area TECNOSUD of Perpignan located in Languedoc Roussillon area (South of France). The building is a large building of more than 5,000 m made of 3 levels and the solar cooling system is located on the ground floor and producing energy only for a small proportion of the building. The general orientation of the building is North/South (45 tilt) and the collector field is oriented in the same direction on the roof. The building was created in 2000 and is of good quality level for the energy efficiency.

General description of the system

The system is based on an adsorption chiller of 7.5 kW coupled with 24 m double glazed flate plate collectors. The system is producing independently energy in parallel of a general multi split compression chiller system.
The distribution system for the solar cooling system is an independent chilled/hot water network using fan coils working at 14/18 C temperature level.
The heat rejection system is done by a drycooler assisted by a spring water spraying device, only used in case of very hot days.

Central air-conditioning unit


closed cycle

Nominal capacity

7.5 kWcold

Type of closed system


Brand of chiller unit


Chilled water application

fan coils



Heat rejection system

dry cooling tower with adiabatic spaying

Solar thermal

Collector type

double glazed flat plat collectors

Brand of collector


Collector area

25 m2 absorber area

Tilt angle, orientation

30 , 45 east

Collector fluid


Typical operation temperature

75 C driving temperature for chiller operation


Heat storage

0.3 m3 water

Cold storage

0.3 m water

Auxiliary heating support


Use of auxiliary heating system


Auxiliary chiller


- type

el. compression chiller

System performance

Energy production monitored (2008-2009):

  • Cooling: 2,500 kWh/year (5 months on 12)
  • Heating: 4,000 kWh/year (6 months on 12)

Energy savings:

  • Cooling & heating : 10 /kWh (ESEER = 2; average quality multisplit split)
  • Electricity consumption: 580 kWh = 58 /year

TOTAL= 540 /year (on the basis of an average increase of energy price of 5%/year)

System reliability and overall success of the installation

The system has been working properly for more than 1.5 years on cooling and heating mode. The overall electrical COP (electrical efficiency of the solar system) has reached an average of 10 on a yearly monitoring duration. The building owner is satisfied by the solar cooling and heating system. However, nearly 10% of the annual solar resource cannot be valorized because the targeted building has no need of heating nor cooling in April (example in 2009) even if the drainback system on the collectors field is protecting the system from overheating risks.

General information

Type of building  Office building
Location  Perpignan
In operation since  July 2008
System operated by  Neotec
Air-conditioned area  180 m2
Capacity  7.5 kW


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Specific information

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


1.5 M


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

Daniel Mugnier