New counter flow heat exchanger designed for ventilation systems in cold climates

Dynamic model of counter flow air to air heat exchanger for comfort ventilation with condensation and frost formation

“…One strategy for defrosting of heat exchangers in cold climates implemented by Kragh et al [6] is presented and modelled results are compared to measurements on a prototype heat exchanger utilizing the strategy. The strategy utilizes two parallel heat exchangers that alternately switch between frosting and defrosting conditions.…”

“…The inlet airflow also switches between the two sections, but is always 100% or 0%. Further details on the prototype heat exchanger and the experimental setup is described in Kragh et al [6]. During the inactive period there is no flow of inlet air (cold air) in the heat exchanger and in the model it is assumed that there is no heat transfer between the heat exchanger plate and the inlet air stream during this period.…”

Heat transfer correlations and NTU number for the longitudinal flow spiral recuperators

“…Kragh et al [16] have tested a new counter flow heat exchanger. The heat exchanging surface of the highly efficient exchanger was made of 5 mm double polycarbonate plates with a wall thickness of 0.5 mm.…”

Experimental investigation on the performance of an air-to-air energy recovery for building applications in hot-humid climate

“…However, a gap still exists between research results and practical applications and therefore, future investigation should be established in these areas to better evaluate the feasibility and reliability of the system in building services. Besides, most studies reported that the application of this system was prevalently designed for cold climate area [5,16,17]. This could be mainly because most studies in the field of air-to-air energy recovery system only focus on the countries with both summer and winter season [8,18].…”