Violeta Misevičiūtė, Lukas Rudzinskas

Simulation of ventilation system with unglazed solar collector and air heat pump

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Abstract

The European Directive on Energy Performance of Buildings (EPBD) obliges to accept measures for improving the energy efficiency in buildings. As buildings become more airtight ventilation takes an important role in building. Ventilation efficiency as a rule is achieved using heat recovery. The efficiency of the air heat recovery is varies depending on the applied type of heat exchanger and changes during the year. A dozen of heat recovery units, renewable energy sources and technologies can be applied to ventilation system to increase an efficiency of it. It should be an opportunity to add ventilation system with renewable energy sources. Such energy recovery and renewable energy technologies as air heat recovery unit, air-to-water heat pump, and unglazed solar collector (UTSC) for ventilation system of the building are analyzed. TRNSYS simulation tool is applied. Simulation results of three technologies (heat recovery unit, air heat pump and unglazed solar collector) using ventilation system performance during the year is presented. Main indicators of UTSC are presented. Simulation results and obtained experimental data of individual cases of such system are compared.

Keywords: air-to-water heat pump; heat recovery; TRNSYS; unglazed solar collector; ventilation.