Abstract
Heating, ventilation and air conditioning systems are responsible for a nearly 50% of total energy consumption in operated buildings. One of the most important parts of the ventilation system is an air handling unit with a heat exchanger for energy recovery which is responsible for effective and efficient energy recovery from exhaust air. Typically heat exchangers are characterised by the producers by heat and humidity recovery efficiency up to 90% and 75% respectively. But these very high values are usually evaluated under laboratory conditions without taking into account a dynamic change of outdoor and indoor air conditions significantly affecting the recovery efficiency. In this paper, results of thermal, humidity and enthalpy recover efficiency of innovative energy recovery exchanger have been presented. The analysed system allows adjustment of the humidity recovery especially useful in the winter period and forefends energy use for an anti-froze system of energy exchanger. Presented result show that analysed innovative system can achieve the value of thermal efficiency recovery higher than 90% and efficiency of humidity recovery about 80%. This is possible because the analysed system is able to work without the use of any primary source energy or other anti-freeze systems. Presented in this research unique solution is able to work without external anti-freeze systems even in extremely adverse outdoor air conditions such as minus 20°C and humidity 100% RH.
Highlights
The construction sector is the largest source of energy consumption in the European Union economy, accounting for almost 40% of total energy demand in the EU-28 countries
This work the results of experimental measurements conducted in order to determine the temperature, humidity and total efficiency of an air handling unit equipped with an innovative periodic counter-flow heat exchanger are shown
The analysis indicates that due to the appropriate design of the heat exchanger equipped with a system of air dampers, it is possible to achieve high system performance
Summary
The construction sector is the largest source of energy consumption in the European Union economy, accounting for almost 40% of total energy demand in the EU-28 countries. This is more than transport (32%) or even whole industry sector (26%) [1]. This sector has been classified as one of the key sectors that should meet the 20-20-20 requirement: to reduce greenhouse gas emissions by 20% compared to 1990, to increase energy savings by 20% and increase the share of renewable energy sources by 20% by 2020. In Poland, the EPBD directive was implemented in 2014, specifying in the national conditions the definition and requirements for this type of building [4]
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