Energy saving potential of a simple control strategy for heat exchanger network operation under fouling conditions

The use of cascade heat pumps for hot water generation has gained much attention in recent times. The big question that has attracted much research interest is how to enhance the performance and energy saving potential of these cascade heat pumps. This study therefore proposed a new cycle to enhance performance of the cascade heat pump by adopting an auxiliary heat exchanger (AHX) in desuperheater, heater and parallel positions at the low stage (LS) side. The new cascade cycle with AHX in desuperheater position was found to have better performance than that with AHX at heater and parallel positions. Compared to the conventional cycle, heating capacity and coefficient of performance (COP) of the new cascade cycle with AHX in desuperheater position increased up to 7.4% and 14.9% respectively.

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A methodology for improving heat exchanger network operation

Applied Thermal Engineering ◽

10.1016/s1359-4311(03)00140-6 ◽

2003 ◽

Vol 23 (14) ◽

pp. 1729-1741 ◽

Cited By ~ 10

Author(s):

H. Rodera ◽

D.L. Westphalen ◽

H.K. Shethna

Keyword(s):

Heat Exchanger ◽

Heat Exchanger Network ◽

Network Operation

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Impact Analysis to Building Energy Consumption of Daylighting Combined Lighting Control

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.260-261.202 ◽

2012 ◽

Vol 260-261 ◽

pp. 202-208

Author(s):

Xiao Lei Li ◽

Huan Li ◽

Jian Ping Gao

Keyword(s):

Energy Consumption ◽

Energy Saving ◽

Control Strategy ◽

Impact Analysis ◽

Building Energy ◽

Geographical Information ◽

Building Energy Consumption ◽

Local Climate ◽

Lighting Control ◽

Energy Saving Potential

A study on the building energy consumption analysis of daylighting-based lighting control strategy was carried out. A circle type of building was mainly simulated by using the eQUEST energy simulating software. By setting various window-wall ratios, we try to find the relationship between the energy saved by daylighting-based lighting control and the other main energy consumptions, such as the cooling and heating energies. The data shows that the energy saving potential of daylighting-based lighting control strategy can be 40% under the proper window-wall ratio, and in the meanwhile, the total energy saving of the whole building can be 8%. A formula is given to get the best window-wall ratio of various cities according to its geographical information and local climate factors.

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Improving Heat Exchanger Network Design of a Revamped Chemical Plant

Indonesian Journal of Science and Technology ◽

10.17509/ijost.v2i1.5992 ◽

2017 ◽

Vol 2 (1) ◽

pp. 87

Author(s):

Zulfan Adi Putra

Keyword(s):

Heat Exchanger ◽

Network Design ◽

Energy Saving ◽

Energy Management ◽

Payback Period ◽

Chemical Plant ◽

Pinch Analysis ◽

Annual Saving ◽

Heat Exchanger Network ◽

Smart Energy Management

Pinch analysis has been known as one of the tools for smart energy management. This technique has successfully been applied in more than three decades in various industries. Here, the purpose of this study was to describe how to use pinch analysis for improving heat exchanger network design of a revamped chemical plant. In a revamping project of a chemical plant, the pinch analysis is applied to find a better design. The analysis reveals that the revamped case can be further improved to achieve more energy saving. This is done by applying one of the golden rules in pinch analysis, which is not to transfer heat across the pinch. The proposed solution is rather simple and straightforward, leading to only few months of payback period and 165 k€ per annual saving.

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Investigation of energy-saving azeotropic dividing wall column to achieve cleaner production via heat exchanger network and heat pump technique

Journal of Cleaner Production ◽

10.1016/j.jclepro.2019.06.224 ◽

2019 ◽

Vol 234 ◽

pp. 410-422 ◽

Cited By ~ 35

Author(s):

Ao Yang ◽

Saimeng Jin ◽

Weifeng Shen ◽

Peizhe Cui ◽

I-Lung Chien ◽

...

Keyword(s):

Heat Exchanger ◽

Energy Saving ◽

Heat Pump ◽

Cleaner Production ◽

Heat Exchanger Network ◽

Dividing Wall Column

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Utilization of an Air-PCM Heat Exchanger in Passive Cooling of Buildings: A Simulation Study on the Energy Saving Potential in Different European Climates

Energies ◽

10.3390/en12061133 ◽

2019 ◽

Vol 12 (6) ◽

pp. 1133 ◽

Cited By ~ 2

Author(s):

Pavel Charvát ◽

Lubomír Klimeš ◽

Martin Zálešák

Keyword(s):

Heat Exchanger ◽

Phase Change ◽

Energy Saving ◽

Operating Conditions ◽

Heat Of Fusion ◽

Passive Cooling ◽

Phase Change Temperature ◽

Set Point ◽

Energy Saving Potential ◽

Change Temperature

The energy saving potential (ESP) of passive cooling of buildings with the use of an air-PCMheat exchanger (cold storage unit) was investigated through numerical simulations. One of the goals of the study was to identify the phase change temperature of a PCM that would provide the highest energy saving potential under the specific climate and operating conditions. The considered air-PCM heat exchanger contained 100 aluminum panels filled with a PCM. The PCM had a thermal storage capacity of 200 kJ/kg in the phase change temperature range of 4 ∘ C. The air-PCM heat exchanger was used to cool down the outdoor air supplied to a building during the day, and the heat accumulated in the PCM was rejected to the outdoors at night. The simulations were conducted for 16 locations in Europe with the investigated time period from 1 May–30 September. The outdoor temperature set point of 20 ∘ C was used for the utilization of stored cold. In the case of the location with the highest ESP, the scenarios with the temperature set point and without the set point (which provides maximum theoretical ESP) were compared under various air flow rates. The average utilization rate of the heat of fusion did not exceed 50% in any of the investigated scenarios.

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