The thermal analysis of a combined heat and power plant undergoing Clausius–Rankine cycle based on the theory of effective heat-absorbing and heat-emitting temperatures

Holmberg, Henrik; Ahtila, Pekka

doi:10.1016/j.applthermaleng.2014.05.100

Cited by 6 publications

(3 citation statements)

References 17 publications

(20 reference statements)

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“…Cooling tower cools the steam used to rotate the steam turbines, condensing it back into water, and then recirculates it to the boiler. During the process of condensing high-temperature steam into water, a significant amount of water vapor is released, exposing the cooling tower to a continuous steam environment [21]. After measuring Tan δ and conducting dielectric breakdown evaluations of XLPE cables, specimens were processed into ribbon-shaped tape samples from the XLPE insulation layer for the measurement of mechanical, chemical, and electrical evaluations, as illustrated in Figure 2.…”

Section: Cable and Specimen Preparationmentioning

confidence: 99%

Analysis of Deterioration Characteristics of Service Aged XLPE Cables according to Installation Location of Combined Heat and Power Plant

Kim,

Jung,

Lee

2024

Preprint

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The number of XLPE cables being used near or beyond their designed lifespan is increasing. The importance of timely cable replacement is increasing. Therefore, research is actively being conducted using VLF Tan δ diagnostic technology to assess the insulation condition of cables. There is a lack of studies measuring and analyzing VLF Tan δ of service aged XLPE cables. Additionally, there is a lack of research considering the operating environment. Therefore, research is needed to diagnose and analyze the insulation condition of the same serviced aged cable when it is operated in a different environment. This paper evaluates and analyzes the insulation condition of cables installed in the BFP, cooling tower, and deaerator booster pump of a combined heat and power plant. Each cable was analyzed by measuring VLF Tan δ, dielectric breakdown test of the cable, and tensile strength, elongation at break, crystallinity, and dielectric strength of XLPE specimens. Additionally, the correlation between VLF Tan δ and other characteristics was also analyzed. It was found that degradation progressed in the order of BFP, cooling tower, and deaerator booster pump. Therefore, it was confirmed that even for the same cable, deterioration varies depending on the installation location.

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Section: Cable and Specimen Preparationmentioning

confidence: 99%

Analysis of Deterioration Characteristics of Service Aged XLPE Cables according to Installation Location of Combined Heat and Power Plant

Kim,

Jung,

Lee

2024

Preprint

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“…Using notations in Fig. 1, the effective heat emitting temperature (Tout) and the effective heat absorbing temperature (Tin) are defined as follows (Holmberg and Ahtila, 2014):…”

Section: Compressor Driven Heat Pumpmentioning

confidence: 99%

Exergetic performance analysis of heat pumps: two alternative approaches

Laukkanen

Holmberg

2019

IJEX

Self Cite

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This paper evaluates the performance of a compressor driven and an absorption heat pump on the basis of exergy analysis using two different approaches. Approach 1 is based on the calculation of the effective heat absorbing and emitting temperatures and the entropy generation rate. Approach 2 is based on the commonly used exergy analysis where the real ambient temperature is used. The main goal is to analyze how these two approaches differ from each other. Approach 1 gives the exact improvement potential (Wreal-Wmin) of the heat pump while Approach 2 underestimates it. The average flow temperature also approximates the correct improvement potential with sufficient accuracy when temperature change of the flow is relatively small. Both approaches can be used when performances of heat pumps are compared. Both approaches also give a more realistic view of the performance than the commonly used COP, especially regarding the absorption heat pump.

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“…In this respect, many studies have been conducted based on the exergy method. Liao, Zhou, and Zhao [13,14] calculated some key indicators of a coal-fired CHP system to assess its performance, and the results showed that the exergy efficiency was 33%. In 2017, in a review of an exergy analysis of traditional coal-fired power plants, Kumar [15] gave an overview of the research works about Rankine cycle CHP systems.…”

Section: Introductionmentioning

confidence: 99%

An Evaluation Method of Comprehensive Performance of Retrofitted CHP District Heating Systems

Chong

Zhou

et al. 2023

Energies

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There is a big wave in China of retrofitting single-purpose coal-fired systems for district heating into heat-oriented combined heat and power (CHP) systems to save energy. Back-pressure steam turbines (BPSTs) and extraction steam turbines (ESTs) are both common in retrofitted systems, but contrastive analyses of their effects on the systems’ operation performance are lacking. Moreover, comprehensive evaluation methods of the retrofitted systems remain unknown. In this paper, exergy, exergoeconomic, and exergoenvironmental analyses were conducted to evaluate the thermodynamic, economic, and environmental performances of two real CHP systems: system A using a BPST and system B using an EST. Additionally, a new multi-criteria evaluation method based on rank correlation analysis was proposed for the retrofitted system. The results show that system A is better than system B in thermodynamic and environmental aspects but poorer in the economic aspect. Overall, the multi-criteria evaluation result indicates that system A has a better comprehensive performance than system B. Therefore, the BPST has a better effect than the EST on the retrofitted CHP system for district heating in this study. The findings could provide a reference point for retrofitting work in the future.

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The thermal analysis of a combined heat and power plant undergoing Clausius–Rankine cycle based on the theory of effective heat-absorbing and heat-emitting temperatures

Cited by 6 publications

References 17 publications

Analysis of Deterioration Characteristics of Service Aged XLPE Cables according to Installation Location of Combined Heat and Power Plant

Analysis of Deterioration Characteristics of Service Aged XLPE Cables according to Installation Location of Combined Heat and Power Plant

Exergetic performance analysis of heat pumps: two alternative approaches

An Evaluation Method of Comprehensive Performance of Retrofitted CHP District Heating Systems

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