Optimizing condenser fan control for air-cooled centrifugal chillers

Yu, F.W.; Chan, K.T.

doi:10.1016/j.ijthermalsci.2007.07.018

Cited by 32 publications

(12 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The condenser fans under CTC are staged as many as possible in most operating conditions to enhance the heat rejection airflow required to decrease the condensing temperature. Simulation analyses on air-cooled screw or centrifugal chillers [7,8] confirmed that the coefficient of performance (COP) of the chillers could increase by up to 237.2% when variable speed condenser fans are used to complement CTC. A COP is defined as the chiller load in kW divided by the power input in kW.…”

Section: Introductionmentioning

confidence: 95%

“…According to many studies [1][2][3][4][5][6][7][8], the deficient performance of air-cooled chillers is mainly due to head pressure control (HPC) under which the condensing temperature floats around a high set point of 50 • C based on a design outdoor temperature of 35 • C, irrespective of different chiller loads and weather conditions. The condenser fan power under HPC can be kept low but with considerable compressor power at such high condensing temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The condenser fan power under HPC can be kept low but with considerable compressor power at such high condensing temperature. To overcome this, proper control of condensing temperature should be developed to optimize the trade-off between the compressor power and condenser fan power, given that the condensing temperature can vary widely in response to outdoor temperatures ranging between 10 to 35 • C. Floating condensing temperature control (CTC) is proposed as an alternative to HPC to lower the condensing temperature in response to changes of ambient and load conditions [6][7][8]. The condenser fans under CTC are staged as many as possible in most operating conditions to enhance the heat rejection airflow required to decrease the condensing temperature.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling of improved energy performance of air-cooled chillers with mist pre-cooling

Chan

2009

International Journal of Thermal Sciences

Self Cite

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modelling of improved energy performance of air-cooled chillers with mist pre-cooling

Chan

2009

International Journal of Thermal Sciences

Self Cite

View full text Add to dashboard Cite

“…It becomes imperative to seek optimum design, installation, maintenance and operation (WARREN;TAYLOR, 2008;CHAN, 2008;CARVALHO et al, 2012;SCHIBUOLA;SCARPA, 2014;OCHOA et al, 2015), so that the system consumes less energy, thereby air conditioning within the technical standards.…”

Section: Introductionmentioning

confidence: 99%

<b>Comparative study of air conditioning systems with vapor compression chillers using the concept of green buildings

2015

View full text Add to dashboard Cite

ABSTRACT. This paper sets out to compare two different cooling systems that use vapor compression chillers for air conditioning environments. It was proposed to compare different operations in isolated and combined action operations. These operations are evaluated in the concepts of green buildings. A mathematical model was developed based on the principles of mass and energy conservation and complemented by various functions so as to determine the thermophysical properties and efficiencies of the compressors. The equations of the model were solved by the EES (Engineering Equation Solver) program. The model evaluates the influence of the main HVAC operating parameters of the chilled water system when operating under three different configurations. The results showed that the system with a differentiated compression presents a COP equal to that of the system with screw chillers in the range 0-300 RTs, and a COP hat is on average 9% higher in the range 400-800 RTs.Keywords: centrifugal chiller, screw chiller, energy, simulation, COP.Estudo comparativo de sistemas de ar condicionado com chillers de compressão de vapor com o conceito de edifícios verdes RESUMO. O presente trabalho se propõe a comparar dois sistemas de refrigeração diferentes usando chiller de compressão de vapor, para a climatização de ambientes. Foi proposto operações diferentes para a comparação em operações isoladas e ações combinadas. Essas operações são avaliadas nos conceitos de edifícios verdes. Foi desenvolvido um modelo matemático baseado nos princípios de conservação de massa e energia e complementado por várias funções, de modo a determinar as propriedades termofísicas e eficiências dos compressores. As equações do modelo foram resolvidos pelo programa EES (Engineering Equation Solver). O modelo avalia a influência dos parâmetros operacionais principais do sistema de refrigeração de água gelada operando em três configurações diferentes. Os resultados mostraram que o sistema com compressão diferenciada apresenta COP igual ao do sistema com chillers parafuso na faixa de 0 a 300 TRs, e um COP superior em média de 9% na faixa de 400 a 800 TRs.Palavras-chave: chiller centrifugo, chiller de parafuso, energia, simulação, COP.

show abstract

“…However, there is very limited research on parameter simulation of air-cooled chillers. A few studies have focused on researching the control strategies and operating conditions of air-cooled chillers under partial load [5][6][7][8][9][10]. Many researchers have used thermodynamic irreversibility analysis and exergy analysis to investigate how different configurations influence the energy efficiency of system components in chillers, heat pumps, refrigerators, and other equipment [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis for Improving the Energy Performance of Air-Cooled Liquid Chillers by Different Condensing-Coil Configurations

Lee

Chang

2012

Entropy

View full text Add to dashboard Cite

This study constructed a parameter analysis for improving the energy performance of air-cooled water chillers by altering the angle configuration of the condenser coils. The mathematical models for energy and exergy analyses of the individual components and overall system of air-cooled water chillers are presented. This study investigated the potential enhancement of performance efficiency in air-cooled chillers and the energy conversion efficiency of each component, in order to determine how the angle configuration of condenser coils influences chiller performance. This study found that the overall performance of an air-cooled chiller could be improved by approximately 3.4%, and the total irreversibility could be reduced by approximately 2.7%. With each 1% increase in average wind speed over the condenser coils, the overall performance of an air-cooled chiller was found to be enhanced by approximately 0.43%, and its total irreversibility was reduced by approximately 0.35%. The results of this study can be effectively applied to air-cooled condenser units, and can provide an important basis of reference for developing and enhancing the energy efficiency of air-cooled chillers. Keywords

show abstract

Optimizing condenser fan control for air-cooled centrifugal chillers

Cited by 32 publications

References 20 publications

Modelling of improved energy performance of air-cooled chillers with mist pre-cooling

Modelling of improved energy performance of air-cooled chillers with mist pre-cooling

<b>Comparative study of air conditioning systems with vapor compression chillers using the concept of green buildings

Energy and Exergy Analysis for Improving the Energy Performance of Air-Cooled Liquid Chillers by Different Condensing-Coil Configurations

Contact Info

Product

Resources

About