Applying condensing-temperature control in air-cooled reciprocating water chillers for energy efficiency

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

doi:10.1016/s0306-2619(02)00053-3

Cited by 54 publications

(28 citation statements)

References 10 publications

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“…This gives the flexibility that the condensing pressure does not have to be kept at an artificially high level at low outdoor-air temperature, thereby enabling the use of varying set-point condensing-pressure control. A varying set-point condensing pressure control, often incorporated as an optional feature, modulates the heat rejection airflow in response to a outdoor ambient temperature to improve an individual chiller's COP at low ambient-temperature conditions [11,24,25].…”

Section: Maximum Part-load Performancementioning

confidence: 99%

Developing a simplified model for evaluating chiller-system configurations

Lee

2007

Applied Energy

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Section: Maximum Part-load Performancementioning

confidence: 99%

Developing a simplified model for evaluating chiller-system configurations

Lee

2007

Applied Energy

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“…As a result, finding new ways to reduce energy consumption in buildings without compromising comfort and indoor air quality is an ongoing research challenge. One proven way of achieving energy efficiency in the vapour compression refrigeration systems is to reduce the compressor discharge pressure [2,3], which decreases its compression ratio, and in turn, causing to less electricity consumption.…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Air-Cooled DX Air-Conditioning Systems with Liquid Pressure Amplification

Vakiloroaya¹,

Ha²

2014

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

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-The objective of this study is to explore an optimal strategy on energy consumption for a direct expansion (DX) air-conditioning system by using a refrigerant pump in the liquid line to allow the system to operate at a lower condensing pressure. An existing DX rooftop package of a commercial building located in a hot and dry climate zone is used for data collection. The theoretical-empirical modelling approach is used to obtain system model, from which the proposed strategy is formulated. A numerical algorithm is developed to analyse the system transient performance, using an iterative loop. As a minimum pressure differential is required across the expansion device, liquid pressure amplification (LPA) devices can be used on DX systems that operate with fixed head pressure control. They can be fitted to new or existing systems. Results show that the LPA approach is more effective when the ambient temperature is falling, with electricity saving around 25.3% in average.

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“…This is the main reason for the rapid increase of power usage during peak hours in summer that leads to higher energy cost [10]. An efficient power demand management and effective power usage control for air-conditioning system will greatly reduce power consumption and the associated energy cost [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of energy and carbon dioxide emission caused by power consumption

Sung

Tsai

Wang

et al. 2010

Int. J. Energy Res.

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SUMMARYThe main objective of this on-site study is to use a full-scale Heating, Ventilating, and Air-Conditioning (HVAC) system installed in an office building in Taiwan for comparing the power consumption, energy-saving, and carbon dioxide (CO 2 ) reduction of two different strategies for controlling the HVAC. These strategies are the Constant Volume (CV) system [Constant Air Volume1Constant-flow], and the Variable Volume (VV) system [Variable Air Volume 1Variable-flow]. The on-site experimental results indicate that average power consumptions are 164 kW for the CV system, and 88 kW for the VV system; the average electric current drops from 469 A for the CV system to 258 A for the VV system. Approximately 46% of the average energy-saving can be achieved if the HVAC system is operated as a VV system. Additionally, the reduced quantity of accumulated CO 2 emission varies from 67 to 3687 kg with 0.637 kg CO 2 kwh À1 emission factor during the office hours of 08:30 (a.m.)-17:00 (p.m.). The results demonstrate that switching the operation of an office building HVAC system from CV to VV will significantly enhance energy-savings and CO 2 reduction. This studywill offer useful information for evaluating an indoor environmental policy with respect to energy-savings and CO 2 emission reduction for office HVACs used in subtropical regions.

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Applying condensing-temperature control in air-cooled reciprocating water chillers for energy efficiency

Cited by 54 publications

References 10 publications

Developing a simplified model for evaluating chiller-system configurations

Developing a simplified model for evaluating chiller-system configurations

Energy-Efficient Air-Cooled DX Air-Conditioning Systems with Liquid Pressure Amplification

Analysis of energy and carbon dioxide emission caused by power consumption

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