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.
Highlights
There is a policy in most countries to improve the energy performance of buildings, the average energy consumption per person in the construction sector has not changed much since 1990 (International Energy Agency, 2017)
Given the multiparametric nature of the analytical description of the processes under study, the search for optimal combinations is carried out using parametric analysis
A parametric analysis of the air handling units (AHU) with heat pump (HP) and heat recovery exchanger (HRE) characteristic energy transformations showed the potential for efficiency improvement in process control choices
Summary
There is a policy in most countries to improve the energy performance of buildings, the average energy consumption per person in the construction sector has not changed much since 1990 (International Energy Agency, 2017). The progress was not so fast as to offset the increase in area (3% per year) and the growing demand for energy in buildings where the main users are HVAC systems. They consume half of the energy consumed in the EU (European Commission, 2016). About a quarter of energy consumption in the building sector can be attributed to office buildings, which account for more than 70% of the final energy consumption for HVAC systems (Schlomann & Kleeberger, 2015). HVAC systems require new intelligent technological solutions that can provide the required indoor air quality and efficiently consume energy for this
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