IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask A Report A-D3b, Date: December 2010
Solar thermal
Collector type
Evacuated tube
Brand of collector Thermomax Mazdon 20
Collector area
24 m 2 absorber
Tilt angle, orientation
30°, 15° west
Collector fluid
water-glycol
Typical operation temperature 75 °C driving temperature for chiller operation
Configuration
Heat storage
0.5 m 3 water
Cold storage
Buffer water (80 liters)
Auxiliary heater
none
Use of auxiliary heating system -
Auxiliary chiller
yes
- type el. Compression chiller
- capacity 3 kW cold
System scheme
System performance
For one cooling season monitored in summer, an average thermal coefficient of performance
of COPth = 0.54 was observed while the collector yield is about 40%. And the electrical
coefficient of performance for the same period is about COPel = 2.5. Focusing on a day with
especially good climatic conditions, the COPth can reach 0.63, and the COPel reached 3.08.
System reliability and overall success of the installation
The main issue for the Maclas installation was actually an “administrative” one. Indeed, the
data transfers were a bit chaotic since they were transferred first by the chiller manufacturer,
and then sent to the institution in charge of the monitoring. And because of the solvability
situation of the chiller manufacturer, it was not possible to access the data to calculate
performances or to check if the installation is working properly. However, this partial
monitoring led to several conclusions. The strengths of the installation were: the ability to
cool down the building from 12pm to 18pm (when it was needed), the compatibility with a dry
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