Energy, exergy and advanced exergy analysis of a milk processing factory

Bühler, Fabian; Nguyen, Tuong-Van; Jensen, Jonas Kjær; Holm, Fridolin Müller; Elmegaard, Brian

doi:10.1016/j.energy.2018.08.029

Cited by 78 publications

(37 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[36][37][38] The pinch method uses data for heating and cooling demands of the process streams and an assumed minimum temperature difference ΔT min for heat exchange to determine the maximum internal heat recovery and minimum utility demands of the process. Bühler et al 39 used a case study to compare pinch analysis with different forms of exergy analysis and concluded that although more process improvement possibilities could be identified with the exergy-based methods, only some of these were possible to implement in practice. Furthermore, pinch analysis was regarded as relatively easy, and more importantly, as the easiest analysis method to communicate to nonscientific staff.…”

Section: Pinch-based Methods For Targeting Of Industrial Excess Heatmentioning

confidence: 99%

Characterization and visualization of industrial excess heat for different levels of on‐site process heat recovery

2019

View full text Add to dashboard Cite

Summary Increased utilization of industrial excess heat (or waste heat) can reduce primary energy use and thereby contribute to reaching energy and climate targets. To estimate the potential availability of industrial excess heat, it is necessary to capture the significant heterogeneity of the industrial sector. This requires the development of methodologies based on case study assessments of individual plants, adopting a systematic approach and consistent assumptions. Since the recovery of excess heat for power generation or off‐site delivery competes with internal recovery for on‐site fuel savings, a well‐founded approach should enable a comparison of the excess heat availability at different levels of internal process heat recovery. To determine the best solution for excess heat utilization for a given process, there is a need for easy screening of various options, while considering that some techniques require heat at a constant temperature while others can exploit a nonisothermal heat supply. This paper presents a new tool, the excess heat temperature (XHT) signature, for exploring the potential heat availability and trade‐offs for excess heat utilization by weighting the heat according to predefined temperature levels and ranges. A set of reference conditions are defined, and an energy targeting approach is proposed that can be used for characterizing the Theoretical XHT signature, which represents the unavoidable excess heat that can be recovered after maximized internal process heat recovery and ideal integration of a power generation steam cycle. The Theoretical XHT signature is contrasted with the Process Cooling XHT signature, which represents the excess heat that can be recovered given the current design and operation of the process and its utility system. The XHT signature curves provide a consistent representation of the excess heat, enabling comparison between sites and aggregation of results from different case studies.

show abstract

Section: Pinch-based Methods For Targeting Of Industrial Excess Heatmentioning

confidence: 99%

Characterization and visualization of industrial excess heat for different levels of on‐site process heat recovery

2019

View full text Add to dashboard Cite

show abstract

“…Energy and exergy analyses are widely used methods for the investigation of processes [36,37], power plants [38][39][40], industrial plants [41,42] or their components. [43,44].…”

Section: Energy and Exergy Analysesmentioning

confidence: 99%

Energy and Exergy Analyses of Forced Draft Fan for Marine Steam Propulsion System during Load Change

Mrzljak

Blecich

Anđelić

et al. 2019

JMSE

View full text Add to dashboard Cite

A forced draft fan, used for the supply of combustion air into the steam generator of the conventional liquefied natural gas (LNG) carrier was analyzed from the aspect of energy and exergy. The power delivered from the induction motor to the fan was calculated using the manufacturer’s data. The most significant impact on the fan energy power losses is from the air temperature difference between the fan outlet and inlet. The fan energy power losses are inversely proportional to the fan energy efficiency, and the values are between 19.9% and 63.4%, for the entire range of observed steam system loads. The fan exergy destruction depends primarily on the driving power and on the air mass flow rate. At higher loads, an important influence on the fan exergy destruction is from the air pressure at the fan outlet. The exergy efficiency change of the analyzed fan, for the range of observed steam system loads, is directly proportional to the rate of change in the air mass flow, whereas the obtained values of exergy efficiency are between 5.10% and 53.93%. The impact of ambient temperature on the fan exergy destruction and exergy efficiency exhibits is different than in most other steam system components. A change in ambient temperature of 10 °C causes a change in the exergy efficiency of the forced draft fan less than 0.5% in the entire range of observed steam loads.

show abstract

“…From the second law of thermodynamics, the definition of exergy analysis can be derived [33]. The main exergy balance equation according to [24] and [34] can be defined as:…”

Section: Energy and Exergy Analysis Of Any Control Volumementioning

confidence: 99%

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

2018

View full text Add to dashboard Cite

A B S T R A C TAn energy and exergy analysis of the condensate pump from the marine steam propulsion system during the condensate leakage between pump stages is presented in this paper. Measurements from the steam propulsion system during exploitation were necessary for collecting all the data for the condensate pump analysis. Due to condensate leakage inside the pump casing, the producer specified condensate pressures at the pump outlet could not be obtained during the exploitation. Low condensate pressure at the pump inlet and condensate temperature slightly above the atmospheric significantly influences the pump exergy analysis. Increase in pump load resulted in an increase of pump energy and exergy losses and efficiencies. In the observed load range during the leakage, pump energy losses are between 19.88 kW and 24.78 kW, while pump energy efficiencies are between 11.12 % and 41.54 %. Pump exergy losses are slightly higher, while exergy efficiencies are slightly lower when compared to energy losses and efficiencies. During normal operation, without leakage, the pump energy efficiencies are from 5 % to 20 % higher in comparison with pump operation when the leakage occurs.

show abstract

Energy, exergy and advanced exergy analysis of a milk processing factory

Cited by 78 publications

References 37 publications

Characterization and visualization of industrial excess heat for different levels of on‐site process heat recovery

Characterization and visualization of industrial excess heat for different levels of on‐site process heat recovery

Energy and Exergy Analyses of Forced Draft Fan for Marine Steam Propulsion System during Load Change

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

Contact Info

Product

Resources

About