Analysis of the temperature, humidity, and total efficiency of the air handling unit with a periodic counterflow heat exchanger

Abstract

Original scientific paper https://doi.org/10.2298/TSCI19S4175JIn this work, thermal, humidity and enthalpy recover efficiency of innovative energy recovery exchanger is presented. The system under analysis allows adjustment of the humidity recovery especially useful in the winter period and forefend energy use for an anti-froze system of energy exchanger. It is shown that the presented method can achieve the real value for humidity and thermal efficiency above 80% and 90%, respectively. Such high efficiency was possible to obtain because the proposed system does not require energy consuming anti-freeze systems. The presented system is able to work even in extremely adverse outdoor air conditions (-20 °C and humidity 100%).

Numerical and experimental analysis of the air stream generated by square ceiling diffusers

“…The turbulent character of fluid flow was simulated using recommended for this type of configurations realizable k-ε turbulence model eq. (1)- (3) and the two-layer approach [4].…”

“…They allow to optimise the indoor climate. This translates into energy-saving and environmental protection [1][2][3]. People in the rooms spend nearly 80% of their time.…”

Comparison of aerodynamic characteristics for various slot diffusers

“…The main task of mechanical ventilation and air conditioning systems is to provide the proper amount of good quality air to the ventilated space. This is done in order to guarantee thermal comfort to users of these rooms [1][2][3]. To accomplish this task, the installation designer should prepare a thermal energy balance and determine the number of harmful substances and pollutants emitted in the space.…”

An experimental investigation of the thermal efficiency and pressure drop for counterflow heat exchangers intended for recuperator

“…At present, plate heat exchangers are very popular due to their compactness and high heat transfer coefficient [9]. They form the basis for very efficient heat recovery because their high efficiency in combination with counter-flow allows obtaining temperatures close to the final values which is the temperature of the air in ventilated space [10][11][12][13].…”