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Data-driven modelling techniques for earth-air heat exchangers to reduce energy consumption in buildings: a review

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Abstract

Increasing population and urbanization call for smarter cities where the cycles of matter and energy are optimized, notably in buildings which are actually a source of pollution consuming a lot of energy. The efficiency of building energy has been improved by modelling earth-air heat exchangers, yet selecting the suitable models is challenging. Here we review data-driven earth-air heat exchanger models used for buildings. We discuss issues brought about by assumptions, unmeasured disruptions, and uncertainties in numerical and experimental works. We found that high accuracy can be reached if sufficient data is available. Models are appropriate for real-time activity due to their structure simplicity, yet they display a poor generalization capacity. Model development is limited by the constrained parameters and the complex boundary conditions of the heat exchangers.

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Abbreviations

HVAC:

Heating, ventilation, and air conditioning

CART:

Classification and regression trees

ANFIS:

Adaptive-network-based fuzzy interface system

ARIMA:

Autoregressive integrated moving average

ARMAX:

Autoregressive moving average exogenous

ARMA:

Autoregressive moving average

SPSS:

Statistical package for the social sciences

\(c_{p}\) :

Specific heat of the material

\(C_{p,air}\) :

Specific heat of the air (kJ/kg K)

\(C_{p,wa}\) :

Specific heat of water (kJ/kg K)

\(I_{C}\) :

Compressor current (A)

\(I_{ef}\) :

Evaporative fan current (A)

\(I_{P}\) :

Pump current (A)

\(k\) :

Materials’ thermal conductivity

\(\dot{m}_{wa}\) :

Rate of mass flow of water (kg/s)

\(\dot{Q}_{cl}\) :

Cooling load of the space (kW)

\(\dot{Q}_{hl}\) :

Heating load of the space (kW)

r :

Radius

\(T\) :

Transient temperature (oC)

\(T_{air,i}\) :

Average inlet air temperature (oC)

\(T_{air,o}\) :

Average outlet air temperature (oC)

\(T_{wa,i}\) :

Average inlet water temperature (oC)

\(T_{wa,o}\) :

Average outlet water temperature (oC)

\(t\) :

Time (s)

\(U_{C}\) :

Compressor voltage (V)

\(U_{P}\) :

Pump voltage (V)

\(\dot{V}_{air}\) :

Volumetric airflow rate (m3 /s)

\(\dot{W}_{c}\) :

Power input into the compressor (kW)

\(\dot{W}_{p}\) :

Water-antifreeze flowing heat pump (kW)

\(\dot{W}_{ef}\) :

Evaporator fan power (kW)

\(\alpha ,\beta ,\gamma ,\theta ,\delta\) :

Polynomials

\(g(x,y,t)\) :

Random function of flux density

y(t), u(t), w(t) :

Output, input, and noise for the polynomials

\(\dot{Q}_{con}\) :

Rejected heat from the ground in cooling mode (kW)

\(\dot{Q}_{eva}\) :

Heat extracted by the ground in heating mode (kW)

\(q^{ - 1}\) :

Backshift operator

\(\cos \phi\) :

Power factor

x :

Axes of symmetry

\(\rho_{air}\) :

Air density (kg/m3)

\(\rho\) :

Specific density of the material

\(T_{0}\) :

Random initial temperature

kW :

Kilowatt

kWh :

Kilowatt-hour

m :

Meter

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Acknowledgements

The authors highly express their gratitude to Asian University for Women, Chattogram, Bangladesh, for their supports in carrying out this study.

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Correspondence to Shams Forruque Ahmed or Dai-Viet N. Vo.

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The authors declare that they have no known competing financial or personal interests that could appear to have influenced the work reported in this study.

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Ahmed, S.F., Saha, S.C., Debnath, J.C. et al. Data-driven modelling techniques for earth-air heat exchangers to reduce energy consumption in buildings: a review. Environ Chem Lett 19, 4191–4210 (2021). https://doi.org/10.1007/s10311-021-01288-7

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  • DOI: https://doi.org/10.1007/s10311-021-01288-7

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