A comparative exergo-economic analysis of four configurations of carbon dioxide direct-expansion geothermal heat pump

Ghazizade–Ahsaee, Hossein; Ameri, Mehran; Askari, Ighball Baniasad

doi:10.1016/j.applthermaleng.2019.114347

Cited by 12 publications

(2 citation statements)

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“…The system achieved a maximum of 12 h continuous operation with COP in the range of 2.60 to 3.40 and an average ground heat rejection rate of about 290 W m −1 . Horizontal ground heat exchangers with CO 2 DX-GSHP were numerically investigated by Ghazizade-Ahsaee et al [39]. The studied configurations included an expansion valve, expander, and intermediate heat exchanger with a peak heating capacity of 8 kW.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In some cases, the descending leg with more content of liquid has a smaller diameter compared to the ascending leg with more content of vapor [88]. Higher exergy efficiency was achieved for space heating domestic hot water by using an expander compared to an expansion valve in a horizontal configuration of DX-GSHP [39]. Slinky horizontal and vertical configurations with DX-GSHP achieved 8% and 12% better EER compared to conventional air conditioning, respectively [40].…”

Section: Pipe Arrangement and Materialsmentioning

confidence: 99%

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Application and Design Aspects of Ground Heat Exchangers

et al. 2021

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With the constant increase in energy demand, using renewable energy has become a priority. Geothermal energy is a widely available, constant source of renewable energy that has shown great potential as an alternative source of energy in achieving global energy sustainability and environment protection. When exploiting geothermal energy, whether is for heating or cooling buildings or generating electricity, a ground heat exchanger (GHE) is the most important component, whose performance can be easily improved by following the latest design aspects. This article focuses on the application of different types of GHEs with attention directed to deep vertical borehole heat exchangers and direct expansion systems, which were not dealt with in detail in recent reviews. The article gives a review of the most recent advances in design aspects of GHE, namely pipe arrangement, materials, and working fluids. The influence of the main design parameters on the performance of horizontal, vertical, and shallow GHEs is discussed together with commonly used performance indicators for the evaluation of GHE. A survey of the available literature shows that thermal performance is mostly a point of interest, while hydraulic and/or economic performance is often not addressed, potentially resulting in non-optimal GHE design.

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Section: Literature Reviewmentioning

confidence: 99%