Energy Conversion Modes Depending on the Outdoor Temperature for an Air Handling Unit With a Heat Pump

Abstract

Modern air handling units (AHU) are increasingly finding solutions in which the main energy transformers are an air heat pump (HP) and a heat recovery exchanger (HRE). The energy conversion modes of such devices are constantly changing in accordance with the constant change on the state of the outdoor air (temperature, humidity). Flexibility, being able to respond to ever-changing ambient air parameters, is an important feature of energy transformation component mode control. The overall seasonal efficiency of the air handling unit depends on this. In this work, a thermodynamic analysis of the characteristic energy transformations of the air handling unit is performed, linking the outdoor and ventilated indoor air and HP refrigerant states, flow rates and component loads. Such parametric analysis with respect to the changing outdoor air temperature allowed to clearly reveal, through various indicators, the influence of the individual components on the operating efficiency of the air handling unit. Combinations of parameters have been obtained that enable the selection of the optimal control concept for the energy conversion mode of the components in the air handling unit (component loads, fluids state parameters and flow rates) over a wide range of outdoor air temperatures.

Experimental Study on the Control of the Positions of the Cycle Isotherms of the Heat Pump in the Air Handling Unit

“…Recently, the situation has been changing, with more and more manufacturers of air handling units (e.g. FläktGroup, Mandik, Dantherm A/S, Komfovent, VENTS) offering ventilation units with integrated heat pumps [13].…”

“…A more detailed description of the calculation methodology, the processes of heat transfer in the condenser and evaporator of the HP, depending on changes in the parameters of the outdoor air and refrigerant, have been presented earlier in other studies on this topic [13], [20], [21].…”