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In tropical countries Heating, Ventilation and Air Conditioning (HVAC) systems are commonly used in tourism facilities to maintain comfort, but with considerable electricity consumption. Much attention had been paid to improving efficiency and saving energy in the thermal systems of hotels, e.g. air conditioning and sanitary hot water (SHW). This work is about energy modeling of a conventional vapor compression system with condensation heat recovery for sanitary hot water production in Cuba. The model estimates the total amount of heat rejected in the condenser from measurable external variables, such as: electric power, ambient temperature and chilled water temperature. The system is evaluated under partial load conditions during winter, when temperatures are low and therefore the demand for cooling is less, while hot water is used for rooms or kitchen services. The results show that the model is valid for actual operating conditions working below its nominal capacity. [ABSTRACT FROM AUTHOR]

In this work are approached the main deficiencies that impact in the operation of the systems of sanitary hot water in hotels with chilled water centralized air conditioning systems, starting from experiences obtained during energy diagnostic. Taking like case of study a hotel, they are carried out specific mensurations of flows of hot water for all the situations possible of demand of a room, and the evaluation of the heat exchangers of badges, being demonstrated the inadequacies in their operation. By means of mathematical models that reflect the occupation percentage schedule of hotels, their relationship was determined with the behavior of the recovery of the heat in the cooling ones. [ABSTRACT FROM AUTHOR]