Study of energy savings by heat recuperation in air conditioning systems. Final report

Measurements of temperature, relative humidity, pressure drop and flow rate were made in two buildings with different types of heat recovery in the air conditioning system, i.e., the regenerator type and the liquid-coupled heat exchanger type. The measurements on the liquid-coupled heat exchanger system were made during the winter, while the measurements on the regenerator system were made in spring. Heat transfer rates and thermal efficiencies were calculated. The thermodynamic performance of each type of heat recovery system is illustrated by means of psychrometric charts (Mollier diagrams). A clear picture of the efficiencies of both heat recovery systems under varying conditions outdoor has been obtained. Average efficiencies and savings of fuel consumption between 30% and 50% may be expected. A cost-benefit analysis for both installations will be presented in a further report.