Residential Building, Milan, Italy

Description of the application

The residential building, where the system is installed, is situated in a border of a municipal park in Milan (North of Italy). This is a two floor building. The building is quite well insulated, in fact it has a ventilated and insulated roof with a U-value of 0.68 W/(mK). The external walls are made with an air space (5 cm), a layer of insulating material (8 cm) and light bricks (25 cm). At the first floor there are two test rooms and a bathroom. They are both facing south with a large window of 1.38 m x 2.05 m.

General description of the system

The solar cooling plant is fed by a 20 m of CPC collectors which deliver thermal energy used for driving a 4.5 kW absorption machine in summer and four fan-coils for the heating in winter.
The system is solar alone, it means that there isnt a back-up system so the chilled water production and the heating function in winter are assigned only to the collector field.

Central air-conditioning unit

Technology

closed cycle

Nominal capacity

4.5 kWcold

Type of closed system

absorption

Brand of chiller unit

Rotartica Solar 045v

Chilled water application

fan coils

Dehumidification

no

Heat rejection system

dry

Solar thermal

Collector type

CPC

Brand of collector

Kloben CPC

Collector area

20 m2 aperture

Tilt angle, orientation

30, 0

Collector fluid

water-glycol

Typical operation temperature

90 C driving temperature for chiller operation

Configuration

Heat storage

2 m3 water, two tanks

Cold storage

none

Auxiliary heating support

none

Use of auxiliary heating system

none

Auxiliary chiller

no

System performance

The system thermal coefficient of performance (COP) for operation in summer 2007 was ranging between 0.6 and 0.7.

System reliability and overall success of the installation

The system has showed a reliable operation. Moreover, a development of the control system is foreseen in summer 2008.

General information

Type of building  residential
Location  Milan, Italy
In operation since  2007
System operated by  Politecnico di Milano
Air-conditioned area  90 m2
Capacity  4.5 kW

Figures

Chiller
Caption 1
Installation building
Chiller
Collectors area
Installation building
Storage
Collectors area
Scheme of the system
Storage

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Specific information

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

IT02_Milano.pdf


Contact

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

Marcello Aprile
marcello.aprile(at)polimi.it