The outdoor swimming pools are subjected to energy losses by evaporation, convection and radiation to the surrounding environment and conduction through the walls and the bottom of the pool. The losses associated with the evaporation phenomena are the most consistent ones and they are strictly related to the velocity of the air that flows over the water table. The thermal behavior of the pool depends on the meteorological conditions of the site and on the use and occupancy of the pool. The pool is often heated in order to ensure suitable comfort conditions for swimmers. During the night hours without swimming pool cover, the evaporation phenomenon will continue to exist and it will depend only on the conditions of the environment. The scope of this work is to simulate the dynamic energy behavior of an existing outdoor swimming pool located in Naples and its surrounding environment to properly size a photovoltaic thermal panels plant (PV/T). In PV/T systems, electric energy is produced by a conventional photovoltaic panel (PV), while the absorber, placed under it, conveys the thermal energy developed by the photovoltaic effect in a heat transfer fluid. In this way, the electrical efficiency of the PV panel rises because it is continuously cooled and simultaneously there is a low-temperature heat production. In the specific case, the electricity produced is intended to meet the electrical user loads while the low enthalpy heat is used to heat the pool water. In the simulation model, the energy losses of the pool, the variability of thermohygrometric conditions of the environment and the production of the PV/T plant are simultaneously taken into account. The system was dynamically simulated in TRNSYS environment, implementing appropriate models for the simulation of heat transfer and evaporation in the swimming pool. The model allows one to evaluate all the energy flows on whatever time basis. In particular, the tool calculates thermal and electrical energy produced by the PVT. Similarly, the model calculates the thermal demand of the swimming pool for heating purposes and for domestic hot water. Results showed that the use of PVT systems allows one to dramatically reduce the energy consumption of swimming pools.
Transient simulation of a photovoltaic/thermal collector heating system for outdoor swimming pools
De Luca Giuseppina;
2014
Abstract
The outdoor swimming pools are subjected to energy losses by evaporation, convection and radiation to the surrounding environment and conduction through the walls and the bottom of the pool. The losses associated with the evaporation phenomena are the most consistent ones and they are strictly related to the velocity of the air that flows over the water table. The thermal behavior of the pool depends on the meteorological conditions of the site and on the use and occupancy of the pool. The pool is often heated in order to ensure suitable comfort conditions for swimmers. During the night hours without swimming pool cover, the evaporation phenomenon will continue to exist and it will depend only on the conditions of the environment. The scope of this work is to simulate the dynamic energy behavior of an existing outdoor swimming pool located in Naples and its surrounding environment to properly size a photovoltaic thermal panels plant (PV/T). In PV/T systems, electric energy is produced by a conventional photovoltaic panel (PV), while the absorber, placed under it, conveys the thermal energy developed by the photovoltaic effect in a heat transfer fluid. In this way, the electrical efficiency of the PV panel rises because it is continuously cooled and simultaneously there is a low-temperature heat production. In the specific case, the electricity produced is intended to meet the electrical user loads while the low enthalpy heat is used to heat the pool water. In the simulation model, the energy losses of the pool, the variability of thermohygrometric conditions of the environment and the production of the PV/T plant are simultaneously taken into account. The system was dynamically simulated in TRNSYS environment, implementing appropriate models for the simulation of heat transfer and evaporation in the swimming pool. The model allows one to evaluate all the energy flows on whatever time basis. In particular, the tool calculates thermal and electrical energy produced by the PVT. Similarly, the model calculates the thermal demand of the swimming pool for heating purposes and for domestic hot water. Results showed that the use of PVT systems allows one to dramatically reduce the energy consumption of swimming pools.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
