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

Asati, Arun Kumar; Kumar, Rakesh

doi:10.1007/s10765-020-02774-w

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…The current experimental study was done on a bank-type EAHE that consists of a series of underground pipes or tunnels that are typically installed horizontally in the ground and connected to the building's ductwork. Substantial research has been done in this field by researchers across the globe with physical experimentation [1][2][3][4][5] and simulation techniques [6][7][8][9][10] at different parametric values using different configurations. Long straight pipes in series [5] have been used largely in EAHE, but the large space required is a major constraint in placing it.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

Goyal¹,

Asati²,

Arora³

2023

Chem Eng & Technol

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The airflow in earth‐air heat exchangers with different types of flow was examined at various inlet velocities. The results show that there is a significant variation in the mass flow rate of air through the holes for both induced and forced flow. The mass flow rate ranges from 0.013 to 0.119 kg s−1 for forced flow and from 0.018 to 0.128 kg s−1 for induced flow at a velocity of 4.1 m s−1. In contrast, the variation in the mass flow rate through the pipes is significant only for forced flow and almost negligible for induced flow. The mass flow rate ranges from 0.029 to 0.054 kg s−1 for forced flow and from 0.043 to 0.045 kg s−1 for induced flow at the same velocity, indicating that induced flow may be a valuable method for optimizing the earth‐air heat exchanger performance.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

Goyal¹,

Asati²,

Arora³

2023

Chem Eng & Technol

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“…Despite the large number of papers dealing with EAHXs available in the scientific literature [9], the vast majority concern EAHXs with pipe diameters not exceeding 0.30 m. Smaller pipe diameters are easier to handle, are less expensive and allow for increased heat transfer coefficients [5,7]. However, pipe diameter is only one among many parameters influencing heat transfer in EAHXs.…”

Section: Introductionmentioning

confidence: 99%

A Large-Diameter Earth–Air Heat Exchanger (EAHX) Built for Standalone Office Room Cooling: Monitoring Results for Hot and Dry Summer Conditions

Duarte,

Gomes,

Moret Rodrigues

et al. 2023

Applied Sciences

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Earth–air heat exchangers (EAHX) use the soil thermal capacity to dampen the amplitude of outdoor air temperature oscillations. This effect can be used in hot and dry climates for room cooling, and depending on the EAHX design, this cooling can be achieved with very few resources other than those used during EAHX construction. This is an obvious advantage compared to the significant energy consumption and operational costs of refrigeration machines traditionally used in room cooling. Despite the large number of papers on EAHXs available in the scientific literature, very few deal with large-diameter EAHXs (with pipe diameters larger than 0.30 m), and even fewer present monitoring data gathered from a built and functional large-diameter EAHX. The present paper uses monitoring data and provides a detailed quantitative analysis of the performance of a large-diameter EAHX built for standalone cooling of an existing office building. The field monitoring was carried out during a characteristic hot and dry summer period of the south of Portugal. Results show that outdoor air to EAHX exit air temperature gradients reach 9 K and cooling capacities exceed 27 kW. Moreover, the studied EAHX is capable of standalone cooling for outdoor air temperatures up to 33 °C and meets more than 50% of the room design cooling demand for outdoor air temperatures as high as 37 °C. This evidences that large-diameter EAHXs have the potential to achieve significant reductions in CO2 emissions and in energy consumption associated with building cooling in hot and dry climates.

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“…It was determined that a pipe with a length of more than 20 m should be constructed in order to achieve indoor thermal comfort. Singh et al [42] evaluated the cooling potential of the EAHE system using concrete pipes. They simply compared the cooling potential of EAHE and its parametric effect between hot-dry climate and hot-humid climate.…”

Section: Introductionmentioning

confidence: 99%

Archives of Thermodynamics

Ahmad,

Prakash

2022

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This paper presents the experimental investigation of an earthto-air heat exchanger for heating purposes in the Patna region of India, using an experimental test rig. In the view of the author, real field experiments have several limitations such as lack of repeatability and uncontrolled conditions. It also takes more time for the response of parameters that depends on nature and climate. Moreover, earth-to-air heat exchangers may be expensive to fabricate and require more land area. Thus, in this work authors executed their experimental work in indoor controllable environments to investigate the thermal performance of an earth-to-air heat exchanger. The actual soil conditions were created and maintained the temperature at 26 • C throughout the soil in the vicinity of pipes. Three horizontal PVC pipes of equal lengths and diameters of 0.0285 m, 0.038 m and 0.0485 m were installed in the test rig. The experiments were performed for different inlet air velocities at ambient air temperature. This study acknowledges that the maximum rise in outlet temperature occurs at a lower speed for smaller pipes. Also, the maximum effectiveness of 0.83 was observed at 2 m/s for the smallest diameter pipe.

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

Cited by 8 publications

References 19 publications

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

A Large-Diameter Earth–Air Heat Exchanger (EAHX) Built for Standalone Office Room Cooling: Monitoring Results for Hot and Dry Summer Conditions

Archives of Thermodynamics

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