Numerical Simulation of Shallow Geothermal Field in Operating of a Ground Source Heat Pump System—A Case Study in Nan Cha Village, Ping Gu District, Beijing

Zhang, Yaobin; Zheng, Jia; Liu, Aihua; Zhang, Qiulan; Shao, Jingli; Cui, Yali

doi:10.3390/w12102938

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…Soil temperature at 0.05 m depth closely matched the air temperature during spring-summer and was found to be half of the latter during fall-winter. This is because heat flow from soil to air makes the ground surface warmer than air under sub-zero temperature (Cinar et al, 2020;Zhang et al, 2020). Furthermore, the curves shift towards the right side with each depth increment.…”

Section: Resultsmentioning

confidence: 99%

Coupled Hydraulic-Thermal Model for Soils under Extreme Weather in Cold Regions

Paranthaman¹,

Azam²

2022

J ENVIRON INFORM LET

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Extreme weather conditions govern the hydraulic and thermal properties of glacial clay deposits under the cold climate of the Canadian Prairies. The prediction of time-dependent soil behavior over the entire year and under extreme weather conditions is required for the design and construction of buried infrastructure. The main contributions of this research are the development and validation of a coupled soil-atmosphere interaction model to predict transient water and heat movement under mean, extreme dry, and extreme wet weather scenarios. Results indicated that the hydraulic properties are governed by the net water flux that resulted in the shifting of the seasons as follows: mean that comprises winter (3½ months), spring (1 month), summer (5½ months), and fall (2 months); dry that includes spring (4 months), summer (4 months), and fall (4 months); and wet that has winter (4 months), inseparable springsummer (5 months), and fall (3 months). The thermal properties are governed by air temperature for the investigated soil. Identical values of thermal gradient during spring-summer (April to October) in all scenarios indicate that the soil gains more heat compared with the heat loss during fall-winter (November to March), especially for mean and dry conditions. Furthermore, the inflection points in heat flux show that the soil gains heat from May to August and loses heat from September to April. Finally, the active depth of soil was found to be 4 ± 1 m for hydraulic properties and 3 m for heat flux.

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Section: Resultsmentioning

confidence: 99%

Coupled Hydraulic-Thermal Model for Soils under Extreme Weather in Cold Regions

Paranthaman¹,

Azam²

2022

J ENVIRON INFORM LET

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“…In this paper, energy balance equations and mass balance equations are established for each component in the proposed high-temperature heat pump unit model. The EES software [13] (an engineering equation solver used to solve a series of algebraic equations, V10.570) is used to solve these equations. REFPROP software [14] (a database of fluid thermodynamics and transport properties, V9.1) inputs the relevant refrigerant thermodynamic parameters into the equations.…”

Section: Modeling Analysis Of the Thermodynamic Cyclementioning

confidence: 99%

Cycle Characteristics of a New High-Temperature Heat Pump Based on Absorption–Compression Revolution

Sun

Liu

et al. 2023

Energies

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A large amount of the waste heat generated during industrial production is not used, which leads to a low energy utilization rate. The recovery of industrial waste heat using heat pumps has the advantages of low energy consumption, high efficiency, safety, and environmental protection. Industrial waste heat has a wide temperature distribution range. Traditional absorption and compression heat pumps can only work in a narrow temperature range due to the thermodynamic cycle, the thermal properties of the working medium, the temperature and pressure resistance of the compressor, and other factors; they cannot simultaneously meet the requirements of a “high heating temperature” and “wide temperature-range heat transfer”. To solve the above problems, this paper proposes a high-temperature heat pump unit based on a coupled cycle of absorption and compression, which can recover low-temperature steam and 50 °C waste heat and produce hot water at 110–130 °C. EES software is used for the mathematical modeling and simulation analysis of the heat pump unit. The results show that, when the driving steam temperature is 140 °C and the waste heat temperature is 50 °C, the heating temperature can reach 110~130 °C and the COP of the system can reach 4.22. Increasing the waste heat outlet temperature and the condensation temperature of the absorption cycle strengthens the COP of the coupled cycle; meanwhile, increasing the evaporation temperature and heating temperature of the absorption cycle reduces the COP of the coupled cycle. The results of this study significantly broaden the operating temperature range and heating temperature of electric heat pumps; our findings therefore have essential research significance for improving energy efficiency in industrial fields.

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“…Mathematical description of heat and mass exchange processes is often led by numerical solutions that help to consider complex geometry and time-dependent boundary conditions (Dendys et al, 2015 ). Several authors present their concepts from different countries (Franco & Vaccaro, 2014 ; Pola et al, 2015 ; Ganguly et al, 2017 ; Winterleitner et al, 2018 ; Raguenel et al, 2019 ; Ma et al, 2020 , Zhang et al, 2020 ). A static model, which can correctly represent the geological nature of the reservoir, is necessary in order to achieve a reliable evaluation and assessment through numerical simulations (Wang & Bauer, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Simulation study of the Lower Cretaceous geothermal reservoir for aquifer thermal energy storage

Hałaj

Pająk

Papiernik

2021

Environ Geochem Health

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The aquifer thermal energy storage (ATES) has gained attention in several countries as an installation for increasing the energy efficiency of geothermal systems and the use of waste heat. The Lower Cretaceous reservoir is known as one of the most prospective for geothermal purposes in Poland. However, in the southern part of the Mogilno–Łódź Trough (Central Poland) is considered to have a lower geothermal potential. The aim of this paper is to study whether the Lower Cretaceous reservoir in this area is suitable for aquifer thermal energy storage. Prior to dynamic simulations in Feflow© software, a regional Petrel© static parametric model which includes a multidisciplinary approach was prepared. A methodology of fitting Petrel’s structural and parametrical model to Feflow requirements is provided within this paper. The performance simulation of 4 systems has been conducted for 30 years. Increasing precipitation potential is expected for aragonite and calcite along with a temperature increase, while silica precipitation carries a much smaller risk. The paper presents potential for ATES systems in the Lower Cretaceous reservoir of the study area with the best doublet location having thermal recovery ratio of 0.47 and 0.34 for 30 and 40 K temperature differential scenario. An imbalance in heat injection/production in the storage system can cause the reservoir to cool faster than in conventional geothermal heating installation. ATES can provide a successful geothermal reservoir boosting in the case of applying a balanced injection of waste heat.

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Numerical Simulation of Shallow Geothermal Field in Operating of a Ground Source Heat Pump System—A Case Study in Nan Cha Village, Ping Gu District, Beijing

Cited by 4 publications

References 52 publications

Coupled Hydraulic-Thermal Model for Soils under Extreme Weather in Cold Regions

Coupled Hydraulic-Thermal Model for Soils under Extreme Weather in Cold Regions

Cycle Characteristics of a New High-Temperature Heat Pump Based on Absorption–Compression Revolution

Simulation study of the Lower Cretaceous geothermal reservoir for aquifer thermal energy storage

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