A Review of Heat Recovery in Ventilation

Abstract

The purpose of the article was to present information on heat recovery in ventilation systems and to highlight what has not been sufficiently researched in this regard. A lot of information can be found on methods and exchangers for heat recovery in centralized systems. Decentralized, façade systems for cyclical supply and exhaust air have not been sufficiently researched. It is known that these devices are sensitive to the influence of wind and temperature, hence heat recovery may be ineffective in their case. The literature describes the aspect of heat recovery depending on the location in climatic zones, depending on the number of degree days (HDD). Attention was also paid to the risk of freezing of heat recovery exchangers. The literature review also showed the lack of a universal method for assessing heat recovery exchangers and the method of their selection depending on the climate.

The Way of Usage and Location in a Big City Agglomeration as Impact Factors of the Nurseries Indoor Air Quality

“…The use of mechanical ventilation, especially for outdoor air pollution, is essential [30]. Other previously mentioned advantages include the possibility of air filtering and the use of heat recovery [47]. The use of small, dedicated, one-room ventilation units does not have to be expensive [48].…”

An Innovative Window Heat Recovery (WHR) System with Heat Pipe Technology: Analytical, CFD, Experimental Analysis and Building Retrofit Performance

“…This is accomplished by centrifugal fan with 6-level adjustable air speeds varied from 10 m 3 /h to 60 m 3 /h. One being installed at the supply air side and another at the exhaust air outlet (Zender-świercz, 2021;Mardiana-Idayu and Riffat, 2012;Cuce and Riffat, 2015). An example of integrating the window heat recovery system in the building is presented in Fig.…”

“…Energy consumption in buildings is responsible for around 40% of the total energy demand in the EU (Ekins and Lees, 2008). Building heating, cooling and ventilation represents between 40%-60% of the total consumption (Zender-świercz, 2021), where ventilation itself is between 20%-30% (National Institute for Health and Welfare, 2013). Several studies indicated that building ventilation will significantly affect occupants' health (Cao and Ren, 2018;Yuan et al, 2018), indoor air quality (Lim et al, 2021;González Couret et al, 2013), heating/cooling demand (Tien et al, 2021;Zuazua-Ros et al, 2019) and energy consumption (Young et al, 2020;Bang et al, 2019).…”

Comparison of Single- and Multipipe Earth-to-Air Heat Exchangers in Terms of Energy Gains and Electricity Consumption: A Case Study for the Temperate Climate of Central Europe

“…This has been supported by several studies, for example, by the results of experimental studies of hot water consumption Energies 2021, 14, 8217 2 of 28 in single-family houses [2], by the analysis of hybrid hot water preparation systems for an industrial hall [3] and by the analysis of the possibility of using renewable energy sources for heating hot water [4]. In the case of ventilation systems, reduction in energy demand can be achieved by using heat recovery systems from the exhaust air [5]. Especially favorable are decentralized systems, in which the low flow resistance of the installation combined with better adaptation to the current needs of users result in significant energy and primary energy savings for residential buildings [6][7][8] but also for swimming pools [9] or for kindergartens [10].…”