Convegni ATI - Accesso riservato soci CTI

Data: 10/09/2010

Autore: Luca A. Tagliafico, Federico Valsuani, Emanuele Carrea, Federico Scarpa

Collana: CA - 63 - Palermo 2008

Note:
In the present study a steady-state (monthly based averaged) simulation of an Integrated Solar Assisted Heat Pump (ISAHP) is carried out. The technical model has been coupled to an economical tool for cost analysis and design optimization purposes.
The model takes into account the climatic condition of the considered installation area and the thermal consumption of the users, estimated by means of energy balances and mean building energy loads.
The ISAHP thermodynamic simulation model provides the estimated values of the energy consumption to the economical analysis tool.
The cost analysis is based on well known economic criteria and parameters such as the Pay Back Period (PBP) and the Net Present Values (NPV). The cash flow of the ISAHP investment is compared to the cash flow of a common water condensing boiler and traditional solar panel installation, for given user energy load.
The model was applied to three different plant configuration: an ISAHP installation to satisfy the domestic water demand and building heating, an ISAHP + water heater integrated system, an ISAHP integrating a traditional solar panel plant (plus a gas burner). In this last case also the possible use of traditional solar panel alternative was examined.
A region of optimal design values in the space of system variables (panel surface, refrigerator size, operating and economic constraints) was identified.
Due to several technological and control strategy limitations, the ISAHP technology has so far detained a secondary role in the renewable energy market, this work shows how ISAHP assessment could be competitive in comparison to other thermal solar applications in terms of primary energy and money saving, provided proper design and control criteria are followed.