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Evaluation of the Cooling Potential of Earth Air Heat Exchanger Using Concrete Pipes

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Abstract

An earth air heat exchanger (EAHE) has advantages of its simplicity, easy implementation and low operating cost. The EAHE system is found less expensive for cooling and heating of buildings in severe climates. In this research paper, efforts have been made to analyze the accomplishment of a low-cost cooling system of outdoor air for the hot-dry & hot-humid climate. The effect of velocity, length and depth on the cooling potential of the system is studied at the inlet and outlet of the pipe. The novelty of this research is that enormous enhancement of the cooling potential has been observed in hot-humid climate than hot-dry climate, which is not available in previous studies. The results show that the maximum cooling potential in hot-dry climate is found 5643 kWh, 7375 kWh, 8939 kWh for the EAHE length of 15 m, 30 m and 45 m, respectively, corresponding to the velocity 2.5 m s−1 and depth 1.5 m. Whereas in a hot-humid climate, maximum cooling potential is achieved 13,373 kWh, 20,134 kWh and 24,080 kWh with a length of 15 m, 30 m and 45 m, respectively, for the given velocity and depth.

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Abbreviations

CFCs:

Chlorofluorocarbons

DBT:

Dry-bulb temperature

DPT:

Dew point temperature

EAHE:

Earth air heat exchanger

GI:

Galvanized iron

HCFCs:

Hydrochlorofluorocarbons

MS:

Mild steel

PVC:

Polyvinyl chloride

RTDs:

Resistance temperature detectors

WBT:

Wet-bulb temperature

C p :

Specific heat at constant pressure (kJ kg−1·K)

D :

Depth of pipe (m)

dw:

Specific humidity (kg kg−1 of dry air)

h fg :

Latent heat of vaporization (J kg−1)

L :

Length of pipe (m)

\(\dot{m}\) :

Mass flow rate (kg s−1)

Q :

Heat transfer (kW)

Q c :

Cooling potential (kWh)

T d :

The temperature difference between inlet and outlet (°C)

T in :

Inlet temperature of air (°C)

T out :

Outlet temperature of air (°C)

v :

Velocity of air (m s−1)

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Acknowledgement

The investigations of earth air heat exchanger may not be fulfilled with the kind help of Professor Rakesh Kumar, Head of Mechanical Engineering Department, Mahatma Gandhi Government Engineering College Kotla (Jeori), Rampur, Himachal Pradesh, India. I also thank Dr. Arun Kumar Asati, Professor at Shaheed Bhagat Singh State Technical Campus, Ferozepur who helped me a lot at every step of my research.

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Authors and Affiliations

  1. SBSSTC, Ferozepur, Punjab, India

    Baljit Singh & A. K. Asati

  2. MGGEC Kotla, Jeori, Himachal Pradesh, India

    Rakesh Kumar

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  1. Baljit Singh
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  2. A. K. Asati
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  3. Rakesh Kumar
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Correspondence to Baljit Singh.

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Singh, B., Asati, A.K. & Kumar, R. Evaluation of the Cooling Potential of Earth Air Heat Exchanger Using Concrete Pipes. Int J Thermophys 42, 19 (2021). https://doi.org/10.1007/s10765-020-02774-w

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  • DOI: https://doi.org/10.1007/s10765-020-02774-w

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