Study on model uncertainty of water source heat pump and impact on decision making

Zhang, Ying; Akkurt, Nevzat; Yuan, Jiaqi; Xiao, Zhihua; Wang, Qianjiang; Gang, Wenjie

doi:10.1016/j.enbuild.2020.109950

Cited by 32 publications

(9 citation statements)

References 53 publications

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“…where COP is performance coefficient of water-source heat pump; T con,w is condenser outlet water temperature; T eva,w is evaporator outlet water temperature; Q eva is evaporator heat load; Q P is plate heat exchanger heat load; W is condenser power. Studies show that the COP of water-source heat pumps with full load is expressed as a polynomial with only water temperature as the independent variable [37]; that is, its uncertainty is related to T con,w and T eva,w , and the sensitivity coefficient is equal to 1. This suggests that changes in the temperature of condenser and evaporator outlet water temperature have the same effect on COP, with a 5% change in temperature causing a 5% change in COP, an effect that is temporarily ignored in this study.…”

Section: Economic Analysismentioning

confidence: 99%

Feasibility Investigation of Geothermal Energy Heating System in Mining Area: Application of Mine Cooling and Aquifer Thermal Energy Exploitation Technique

Ding,

Zhang,

et al. 2024

Energies

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Mine heat hazards have resulted in large amounts of high-quality coal resources in deep that cannot be mined. The mining industry is paying more and more attention to the extraction and utilization of geothermal energy in mines, while at the same time reducing the underground temperature to realize co-extraction of coal and heat. In addition, coal mines tend to burn large amounts of coal to heat mine buildings and provide hot water for workers’ daily baths, creating operating costs and increasing greenhouse gas emissions. Therefore, it is of great significance to investigate the feasibility of extracting geothermal energy to provide the daily heat load for mines. Currently, there is little research on the feasibility of geothermal energy extraction and utilization in productive mines instead of abandoned mines. In this study, according to the actual situation of Xinhu mine in eastern China, a combined geothermal water system and heat-pump heating system is proposed, aiming to effectively realize mine cooling and geothermal exploitation and utilization. The geothermal storage capacity in the area is analyzed, and an economic analysis is developed. The economic analysis indicates that the main factors affecting the feasibility of the system are the number of mine users, the distance from the geothermal production well to the mine buildings, and the coal price. The research shows that the economic efficiency of the system is better when the heating scale is larger and the distance is smaller. As coal prices rise, the combined geothermal water and heat-pump heating system will be more economical than traditional coal heating. If a mine has 2000 workers, the application of this system can prevent 334.584 t of CO2 emissions per year.

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Section: Economic Analysismentioning

confidence: 99%

Feasibility Investigation of Geothermal Energy Heating System in Mining Area: Application of Mine Cooling and Aquifer Thermal Energy Exploitation Technique

Ding,

Zhang,

et al. 2024

Energies

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“…The electric chiller supplements the absorption chillers in the hot summer and warm winter areas in summer. Equation (4) shows the models of electric chillers and heat pumps [45]. P consume,hpc is the electricity consumption of heat pumps or chillers (kW), while P rated,hpc is the rated power consumption of heat pumps or chillers (kW) at full capacity.…”

Section: Biomass Generatormentioning

confidence: 99%

Design Optimization and Comparative Analysis of 100% Renewable Energy Systems for Residential Communities in Typical Areas of China When Considering Environmental and Economic Performance

Ling¹,

Cui²,

Zheng³

et al. 2021

Sustainability

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A 100% renewable energy system (RES) satisfies a user’s energy demand using only renewable energy, which is an important energy supply in China given that the government aims to realize carbon neutrality by 2060. The design and operation of 100% RESs in different areas would vary significantly due to the impacts of climates and geographical features. This study aimed to investigate the economic and environmental performance of 100% RESs for residential communities in different areas of China. In total, 30 typical cities were chosen based on the climate characteristics and the availability of renewable energy resources. The genetic algorithm was selected to obtain the optimal design of the 100% RES in each area by taking the minimum total annual cost and the minimum CO2 emissions as optimization objectives. The results showed that 100% RESs were dominated by solar energy and biomass. The investment could be recovered in 8 years if the economic performance was optimized in most areas, but the payback period became longer when the 100% RES was optimized when considering environmental performance. The emissions could be reduced by 86–99% for CO2 and 64–97% for NOx. The results of this study would provide data support for the investment of 100% RESs in rural or suburban areas of China.

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“…The relationship between the COP and PLR is characterized by a COP/PLR curve (Sun et al 2009;Huang et al 2016;Zhang et al 2020). Different chillers may have a different COP/PLR curve, determined by the compressor types, such as screw roll, centrifugal, reciprocating or scroll, and operating settings, such as evaporating and condensing temperature (ASHRAE 2011).…”

Section: Introductionmentioning

confidence: 99%

Generic load regulation strategy for enhancing energy efficiency of chiller plants

Wan,

Gong,

Wang

et al. 2024

Build. Simul.

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In many chiller plants, high coefficient of performance (COP) is only achieved at a few favorable part load ratios (PLRs), while the COP is low at many other non-favorable PLRs. To address this issue, this study proposes a generic load regulation strategy that aims to maintain chiller plants operating at high COP, particularly under non-favorable PLRs. This is achieved by incorporating thermal energy storage (TES) units and timely optimizing the charging and discharging power of the integrated TES units. The optimal charging and discharging power is determined by solving a dynamic optimization problem, taking into account the performance constraints of the TES units and the chiller plants. To provide an overview of the energy-saving potential of the proposed strategy, a comprehensive analysis was conducted, considering factors such as building load profiles, COP/PLR curves of chillers, and attributes of the TES units. The analysis revealed that the proposed load regulation strategy has the potential to achieve energy savings ranging from 5.7% to 10.8% for chiller plants with poor COPs under unfavorable PLRs, particularly in buildings with significant load variations.

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Study on model uncertainty of water source heat pump and impact on decision making

Cited by 32 publications

References 53 publications

Feasibility Investigation of Geothermal Energy Heating System in Mining Area: Application of Mine Cooling and Aquifer Thermal Energy Exploitation Technique

Feasibility Investigation of Geothermal Energy Heating System in Mining Area: Application of Mine Cooling and Aquifer Thermal Energy Exploitation Technique

Design Optimization and Comparative Analysis of 100% Renewable Energy Systems for Residential Communities in Typical Areas of China When Considering Environmental and Economic Performance

Generic load regulation strategy for enhancing energy efficiency of chiller plants

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