Ricerc@Sapienza

Residential and non-residential buildings are responsible for approximately 40% of energy consumption and CO2 emissions in the EU. Considering that almost 75% of the building stock in EU is energy inefficient, the European energy policy promotes the improvement of the energy performance of existing buildings by introducing the innovative model of nearly zero energy building (nZEB). In the nZEB model, local energy sources (generation, storage and load management), building automation (BACS) and electronic monitoring of technical building systems (TBS) play a fundamental role.

Le pompe di calore ad assorbimento sono macchine energeticamente interessanti che permettono di ottenere calore indipendentemente dal consumo di fonti di energia di prima specie e di evitare l’emissione di gas serra. Nel campo di temperature e pressioni utili in ambito industriale (dove si utilizzano principalmente soluzioni NH3-H2O), investigare la reazione di dissociazione dell’ammoniaca (da un punto di vista termodinamico e termocinetico) consente di assicurare un loro corretto funzionamento.

When water-ammonia absorption machines are used as heat pumps, the main problems can be found in the components operating at a high pressure (generator-condenser); the increase in temperature with respect to the exertion as refrigerator generates particular conditions that might unbalance the decomposition of ammonia into nitrogen. A decrease in the rate of the refrigerating fluid NH3 in the condenser and evaporator occurs, hence of the performance coefficient of the heat pump with an increased risk of the potential generation of explosive mixtures due to the presence of the hydrogen.

Cogeneration (CHP) and Heat Pump (HP) are playing a key role in energy systems due to their high efficiency, especially, in energy refurbishment of buildings and industrial processes. This paper explored the opportunity to couple those two well-established technologies for heating purposes. Basically, the coupling entails limitations and constraints consisting of the mismatch between the power sizes of merchandised machines as well as the deriving technical issues. The main aim of this paper is to analyse the coupling procedure to help HVAC specialists in their job.