IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration
Subtask A Report, Date:…
As it can be seen, the system was designed to limit as much as possible the electricity
consumption of the overall installation. Indeed only 4 pumps are used to run the entire
system (without distribution). Moreover, a simple system always works better than a
complicated one.
Another point which must be enlightened it the choice of a dry cooler for the system’s heat
rejection. The “Résidence de Lac” is a building for retired peoples. As a consequence
legislation is very drastic concerning the legionella bacteria, and a drycooler was the only
affordable way to reject efficiently energy without any restrictive regulation.
Building:
- Type of building: Retired people residence
- Location: Maclas, France
- In operation since 2007
- System operated by: SIEL
- Air-conditioned area: 210 m²
- System is used for space cooling and heating (No DHW preparation)
System general properties:
- Technology: closed cycle
- Nominal capacity: 10 kWcold
- Type of closed system: Absorption
- Brand of chiller unit: Sonnenklima
- Chilled water application: Fan coils
- Dehumidification: no
- Heat rejection system: dry
Solar thermal:
- Collector type: Evacuated tube
- Brand of collector: Thermomax Mazdon 20
- Collector area: 24 m² absorber
- Tilt angle, orientation: 30°, 15° west
- Collector fluid: water-glycol
- Typical operation temperature: 75°C driving tempe rature for chiller operation
Configuration:
- Heat storage: 0.5 m3 water
- Cold storage: Buffer water (80 liters)
- The hot and cold backups are not included into the solar project, so they are not
monitored. Indeed, the building is an existing building, so a conventional heater and
air conditioning system were already used.