Skip to main content

Advertisement

SpringerLink
Log in

Analysis of exergy demand for air heating of an air handling unit

  • Original Article
  • Published:
Energy Efficiency Aims and scope Submit manuscript

Abstract

In modern buildings, an increasing amount of the consumed energy falls on ventilation systems. The amount of energy needed for ventilation depends on weather fluctuations, wind, interaction between natural gravity and air tightness of the building, heat exchangers used in ventilation systems, efficiency of other ventilation equipment, and operating mode of ventilation systems in the building. Ventilation systems are comprised of a variety of elements that facilitate processes using energy of different types. The main elements that use energy in ventilation systems are fans, heat exchangers, and heaters. They have a significant effect on both energy needs of a public building and the exergy efficiency of a system. In order to achieve a more efficient use of exergy in heat exchangers, it is recommended to execute processes under as little temperature difference as possible; however, this increases the area of heat exchangers. Results of the analysis show that it is recommended to design ventilation systems based on the temperature that corresponds with the maximum demand of exergy in order to use the heat recovery unit as much as possible in the system.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Subscribe and save

Springer+ Basic
$34.99 /Month
  • Get 10 units per month
  • Download Article/Chapter or eBook
  • 1 Unit = 1 Article or 1 Chapter
  • Cancel anytime
Subscribe now

Buy Now

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

Similar content being viewed by others

Abbreviations

a = c/S d :

(a = 0.125098)

c :

constant that is characteristic for a specific region, the value of which is usually 1

c p :

specific heat of fluid, kJ/kgK

dZ :

duration, days

\( {\dot{E}}_{X,Z}^{+,-} \) :

exergy supplied (+) or (obtained (−)) to heat recovery unit (X) or (heater (Z), kW

M :

mass flow of the fluid, kg/s

N :

duration of the period considered (365 days in year)

\( \dot{Q} \) :

heat flow, kW

S d :

standard deviation of the daily mean temperature

T :

outdoor air temperature, K

T a :

ambient temperature, K

T f :

temperature of fluid of analysed point, K

T m :

average daily outdoor air temperature for the considered period, (279.2 K), K

T 1 ′ :

initial temperature of fluid, K

T 1 ′′ :

final temperature of fluid, K

η c :

Carnot factor.

References

  • Avgelis, A., & Papadopoulos, A. M. (2009). Application of multicriteria analysis in designing HVAC systems. Energy and Buildings, 41(7), 774–780.

    Article  Google Scholar 

  • Bertoldi, P. and Atanasiu, B. (2009). Electricity Consumption and Efficiency Trends in the Enlarged European Union - Status Report 2009. Retrieved (http://qualenergia.it/sites/default/files/articolo-doc/Electricity Consumption in UE.pdf).

  • Du, Z., Jin, X., & Fan, B. (2015). Evaluation of operation and control in HVAC (heating, ventilation and air conditioning) system using exergy analysis method. Energy, 89, 372–381 Retrieved (http://dx.doi.org/10.1016/j.energy.2015.05.119).

    Article  Google Scholar 

  • EU. (2010). Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the Energy Performance of Buildings (recast).

  • Gonçalves, P., Gaspar, A. R., & Gameiro Da Silva, M. (2013). Comparative energy and exergy performance of heating options in buildings under different climatic conditions. Energy and Buildings, 61, 288–297.

    Article  Google Scholar 

  • Harvey, L., & Danny, D. (2009). Reducing energy use in the buildings sector: measures, costs, and examples. Energy Efficiency, 2(2), 139–163.

    Article  Google Scholar 

  • Incropera, F. P., Dewitt, D. P. (2002). Introduction to heat transfer (4th edn.). John Wiley & Sons, pp. 723–729.

  • Janna, W. S. (2000). Engineering heat transfer (Second ed.). Boca Raton: CRC Press.

    MATH  Google Scholar 

  • Jansen, S. C., Terés-Zubiaga, J., & Luscuere, P. G. (2012). The exergy approach for evaluating and developing an energy system for a social dwelling. Energy and Buildings, 55, 693–703.

    Article  Google Scholar 

  • Jonsson, D. K., et al. (2011). Energy at your service: highlighting energy usage systems in the context of energy efficiency analysis. Energy Efficiency, 4(3), 355–369.

    Article  Google Scholar 

  • Kofoworola, O. F., & Gheewala, S. H. (2009). Life cycle energy assessment of a typical office building in Thailand. Energy and Buildings, 41(10), 1076–1083.

    Article  Google Scholar 

  • Laustsen, J. (2008). Energy efficiency requirements in building codes, energy efficiency policies for new buildings. Paris.

  • Laverge, J., & Janssens, A. (2012). Heat recovery ventilation operation traded off against natural and simple exhaust ventilation in Europe by primary energy factor, carbon dioxide emission, household consumer price and exergy. Energy & Buildings, 50, 315–323.

    Article  Google Scholar 

  • Martinaitis, V. and Streckiene, G. (2016). Concerning exergy efficiency evaluation of heat recovery exchangers for air handling units. International Journal of Exergy x(x).

  • Martinaitis, V., Bieksa, D., & Miseviciute, V. (2010). Degree-days for the exergy analysis of buildings. Energy and Buildings, 42(7), 1063–1069.

    Article  Google Scholar 

  • Martinaitis, V., Streckienė, G., Biekša, D., & Bielskus, J. (2016). The exergy efficiency assessment of heat recovery exchanger for air handling units, using a state property – Coenthalpy. Applied Thermal Engineering, 108, 388–397 Retrieved (http://linkinghub.elsevier.com/retrieve/pii/S1359431116312522).

    Article  Google Scholar 

  • Misevičiūtė, V. and Martinaitis, V. (2008). Dependence of exergy efficiency of recuperative heat exchanger on dimensionless temperature. Pp. 57–63 in Proceedings of The 5th conference of young scientists on energy issues (CYSENI 2008), held in Kaunas(Lithuania) on May 29, 2008. Kaunas: LEI.

  • Mróz, T. M., & Dutka, A. (2015). Exergy–economic evaluation of heat recovery device in mechanical ventilation system. Energy and Buildings, 86, 296–304.

    Article  Google Scholar 

  • Nikulshin, V., Wu, C., & Nikulshina, V. (2002). Exergy Efficiency Calculation of Energy Intensive Systems, 2, 78–86.

    Google Scholar 

  • Nyman, M., & Simonson, C. J. (2005). Life cycle assessment of residential ventilation units in a cold climate. Building and Environment, 40(1), 15–27.

    Article  Google Scholar 

  • Parfentyeva, N., Samarin, O., Lushin, K., Paulauskaite, S. and Valancius, K. (2011). Temperature efficiency of rotary heat recovery units in ventilation and air conditioning. Pp. 799–801 in The 8th International Conference “Environmental Engineering”, May 19–20, 2011. Vilnius: Vilnius Gediminas Technical University.

  • Pavlovskaja, O. and Juodis, E. (2006). Extracted ventilation air heat recovery efficiency analysis (Šalinamo Vėdinimo Oro šilumos Atgavimo įrangos Efektyvumo Analizė). Pp. 81–87 in National scientific conference “Building Services” (“Pastatų inžinerinės sistemos”), held in Vilnius on 27–28 th May 2006., edited by Technika. Vilnius: Technika.

  • Pérez-Lombard, L., Ortiz, J., & Pout, C. (2008). A review on buildings energy consumption information. Energy and Buildings, 40(3), 394–398.

    Article  Google Scholar 

  • Schmidt, D. (2009). Low exergy systems for high-performance buildings and communities. Energy and Buildings, 41(3), 331–336.

    Article  Google Scholar 

  • Torío, H., Angelotti, A., & Schmidt, D. (2009). Exergy analysis of renewable energy-based climatisation systems for buildings: a critical view. Energy and Buildings, 41(3), 248–271.

    Article  Google Scholar 

  • Wall, G. (1986). – a useful concept. (available on Internet http://exergy.se/goran/thesis/).

Download references

Author information

Authors and Affiliations

  1. Vilnius Gediminas Technical University, Sauletekio ave. 11, LT-10223, Vilnius, Lithuania

    Violeta Misevičiūtė, Kęstutis Valančius, Violeta Motuzienė & Genrika Rynkun

Authors
  1. Violeta Misevičiūtė
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Kęstutis Valančius
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Violeta Motuzienė
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Genrika Rynkun
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Kęstutis Valančius.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Misevičiūtė, V., Valančius, K., Motuzienė, V. et al. Analysis of exergy demand for air heating of an air handling unit. Energy Efficiency 10, 989–998 (2017). https://doi.org/10.1007/s12053-016-9499-7

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s12053-016-9499-7

Keywords

Search

Navigation