Performance evaluation of a novel hybrid cooling system combining indirect evaporative cooler and earth-air heat exchanger

Nemati, Nasibeh; Omidvar, Amir; Rosti, Behnam

doi:10.1016/j.energy.2020.119216

Cited by 38 publications

(3 citation statements)

References 40 publications

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“…The use of PCMs shifts the peak load and enables a higher temperature of the chiller water [23]. Nemati et al proposed to precool the air by the ground source heat exchanger and further cool the supply air through the IEC, which resulted in a 45% reduction in water consumption [24]. Shi et al performed a techno-economic evaluation of a dedicated outdoor air system using an IEC and an auxiliary cooling coil in an office building.…”

Section: Literature Reviewmentioning

confidence: 99%

Feasibility Analysis of Indirect Evaporative Cooling System Assisted by Liquid Desiccant for Data Centers in Hot-Humid Regions

Shi,

Ma,

Min

et al. 2024

Sustainability

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The rapid development of data centers (DCs) has led to a marked increase in energy consumption in recent years, which poses a direct challenge to global efforts aimed at reducing carbon emissions. In regions with hot and humid climates, the energy demand is largely driven by air conditioning systems necessarily to maintain appropriate operational temperatures. This study proposes a novel multi-stage indirect evaporative cooling (IEC) system, incorporating a liquid desiccant in the primary air channel to address the cooling demands of such DCs. Our approach involves a two-stage process where the first stage uses a liquid desiccant-based IEC (LD-IEC) for air dehumidification and the second stage utilizes the treated air from the first stage as the secondary air to enhance the cooling effect. A simulation model of the proposed system is established with validation, and the performance of the multi-stage system was also discussed based on different operation modes. Furthermore, a case study was conducted to investigate the feasibility of using this system in the DC under a typical hot and humid zone. The findings reveal that the first-stage LD-IEC is capable of diminishing the wet-bulb temperature of the ambient air. Furthermore, the case study demonstrates that the proposed system can greatly improve the temperature drop by 72.7% compared to the single IEC, which noticeably reduces the operation time of energy-intensive supplementary cooling equipment from 5092 h to 31 h given the supply air temperature threshold of 25 °C. In summary, the proposed system could substantially decrease reliance on traditional cooling systems, which demonstrates a promising avenue to fully use this passive cooling technology for cooling DCs.

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Section: Literature Reviewmentioning

confidence: 99%

Feasibility Analysis of Indirect Evaporative Cooling System Assisted by Liquid Desiccant for Data Centers in Hot-Humid Regions

Shi,

Ma,

Min

et al. 2024

Sustainability

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“…These could be installed in the form of spiral [19] or slinky [20] shape. EAHE is simpler than that of GSHP since it only utilizes an underground duct to circulate air and supply it to the conditioned space via a blower [21,22].…”

Section: Introductionmentioning

confidence: 99%

An investigation on organic Rankine cycle incorporating a ground-cooled condenser: Working fluid selection and regeneration

Mahmoud

Alkhedher

Ramadan

et al. 2022

Energy

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“…Excavation work charges were USD 732.9 for one day, each pipe with a diameter of 0.25 m and a length of 36 m had an estimated cost of USD 3225, the blower had a cost of USD 109.9, the heat recovery unit cost USD 879.5, and accessories, such as vents and indoor pipes, were estimated to cost USD 703.6. Nemati et al (2021) evaluated the combination of EAHE with indirect evaporative cooling to reduce the water consumption of evaporative cooling systems, in arid and semi-arid regions [24]. Their analysis estimated a total investment of USD 2500, achieving electricity (in summer) and natural gas (in winter) savings of USD 112 and USD 104, respectively.…”

Section: Introductionmentioning

confidence: 99%

Economic Analysis of a Zero-Water Solar Power Plant for Energy Security

Camba

Petrakopoulou

2021

Applied Sciences

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Water dependency of power plants undermines energy security by making power generation susceptible to water scarcity. This study evaluates the economic performance of a novel dry-cooling system for a water-independent solar power plant. The proposed cooling system is based on the concept of earth–air heat exchangers, approaching zero environmental impact. The viability of the proposed design is discussed based on both costs and benefits, and it is compared to both conventional dry- and wet-cooling systems. The installation costs of the plant are found to be EUR 13,728/kW, resulting in the substantial levelized cost of electricity of EUR 505.97/MWh. The net present value of the studied design assuming a water-cost saving of EUR 1/m3 is found to be MEUR –139.59. Significantly higher water prices in the future might eventually make the proposed system economically attractive when compared to water-cooling systems. However, the new system would require drastic modifications to become more attractive when compared to existing dry-cooling systems. Specific possibilities to improve it for zero-water use in thermoelectric power plants are further discussed.

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Performance evaluation of a novel hybrid cooling system combining indirect evaporative cooler and earth-air heat exchanger

Cited by 38 publications

References 40 publications

Feasibility Analysis of Indirect Evaporative Cooling System Assisted by Liquid Desiccant for Data Centers in Hot-Humid Regions

Feasibility Analysis of Indirect Evaporative Cooling System Assisted by Liquid Desiccant for Data Centers in Hot-Humid Regions

An investigation on organic Rankine cycle incorporating a ground-cooled condenser: Working fluid selection and regeneration

Economic Analysis of a Zero-Water Solar Power Plant for Energy Security

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