Applying a novel extra-low temperature dedicated outdoor air system in office buildings for energy efficiency and thermal comfort

Han, Li; Lee, Wai Ling; Jia, Jie

doi:10.1016/j.enconman.2016.05.036

Cited by 29 publications

(14 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…confirmed that it was more energy efficient than conventional system [21]. However, in the previous 100 study, the multi-stage DX system was regarded as an integral component.…”

mentioning

confidence: 95%

“…The design parameters were determined according to local codes [34]. As the same case study building has been referenced for many previous studies [14,20,21,35,36], to avoid duplications, only the typical floor layout and building characteristics are given. They are shown in Figure 3 and Table 2, respectively.…”

Section: Case Study Buildingmentioning

confidence: 99%

“…Therefore, exergy analysis is essential for the optimum design of multi-stage DX system. Considering that both energy use and exergy loss are essential energy system characteristics, the authors had conducted an exergy analysis on XT-DOAS and confirmed that it was more energy efficient than conventional system [21]. However, in the previous study, the multi-stage DX system was regarded as an integral component.…”

Section: Introductionmentioning

confidence: 99%

“…has been referenced for many previous studies [14,20,21,35,36], to avoid duplications, only the typical 153 floor layout and building characteristics are given. They are shown in Figure 3 and Table 2, In deciding the range of values for the two studied parameters, reference was made to cold 159 system design [15] and previous studies [14,20,21].…”

mentioning

confidence: 99%

“…163 164 In deciding the range of values for the two studied parameters, reference was made to cold system design [15] and previous studies [14,20,21]. t X, was set as 4 • C to 10 • C (1 • C interval) and the number of cooling stage (N) was set as 2 to 4.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Exergy Analyses and Modelling of a Novel Extra-Low Temperature Dedicated Outdoor Air System

2018

Self Cite

View full text Add to dashboard Cite

Abstract:A novel dedicated outdoor air system (DOAS) comprising a multi-stage direct expansion coil to produce extra-low temperature (XT) outdoor air to handle the entire space cooling demand has been confirmed more efficient than conventional systems. To further enhance the performance of XT-DOAS, the optimum number of cooling stages and treated outdoor air temperature need to be determined. This process requires the development of a coil performance model that takes into account the extra-high and extra-low entering air temperatures at the first and the last cooling stages. In this study, factory test data and field measurement data were used to develop such a performance model. Different statistical analyses were employed to validate the developed model. Based on the developed model, energy and exergy analyses were conducted to evaluate use of XT-DOAS for space cooling of a typical office building in Hong Kong. EnergyPlus was employed for the energy analysis. The laws of thermodynamics were used for the exergy analysis. Their combined results indicate that for better energy efficiency and performance for air-conditioning of office buildings in subtropical region, the optimum configuration for XT-DOAS is two cooling stages with a treated outdoor air temperature of 7 • C. The model developed and the energy and exergy analyses described will contribute significantly to future research in this area.

show abstract

“…confirmed that it was more energy efficient than conventional system [21]. However, in the previous 100 study, the multi-stage DX system was regarded as an integral component.…”

mentioning

confidence: 95%

Section: Case Study Buildingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Exergy Analyses and Modelling of a Novel Extra-Low Temperature Dedicated Outdoor Air System

2018

Self Cite

View full text Add to dashboard Cite

show abstract

Remote control‐based energy management for energy savings in a central heating system

Şahin

Ipek

Başoğul

et al. 2016

Env Prog and Sustain Energy

View full text Add to dashboard Cite

In this study, to enhance the performance of a central heating system, the following tasks were performed on the system via Radio Frequency modems: collection of data, evaluation of the system, real time monitoring, remote control, and management processes. A central heating system testing apparatus and related software and hardware were developed. Both short‐time and long‐time experiments were conducted. In the experiments, Case 1, in which the system operated under ambient conditions for an hour without remote control, was compared with Case 2, in which the space temperature was kept constant at 21°C. The experimental results indicated that Case 2, in which remote control‐based energy management was conducted, resulted in 20 L of fuel savings compared to Case 1, and a 57–60% thermal efficiency was measured. As a result, a central heating system using remote control‐based energy management is more efficient, economical, and less harmful to the environment. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 600–609, 2017

show abstract

Energy‐efficient hybrid A/C and freshwater production system proposed for high latent load spaces

2019

View full text Add to dashboard Cite

Summary Huge amount of energies is consumed by the air conditioning (A/C) to maintain the required temperature and humidity inside spaces/applications of high humidly. An innovative A/C system that recovers the condenser heat in process air reheating and other useful thermal utilization is presented and investigated in this paper. For high coefficient of performance (COP) of the AC and more energy‐efficient system, the cold exhaust air rejected by the air condition system is also utilized to cool the condenser of the AC system. Huge amount of the water condensate from the system is also utilized as freshwater production. Performance of the proposed system is analytically investigated for different operating conditions and system capacities. Mathematical model of the systems is developed and solved numerically using Engineering Equation Solver (EES) software. Results show that the proposed system enhances the COP and decreases the electric power consumption. The saving in electric power consumption, COP, and the freshwater production rate of the system increases with decreasing room‐sensible heat factor, fresh air ratio, and outdoor air temperature and humidity. Moreover, the COP of the proposed system is 90% higher than COP of the basis system, and the savings in the running cost of the system increase by 4.5 times with decreasing the room‐sensible heat factor (RSHF) from 0.6 to 0.2. In addition, the highest COP attained by the proposed system is 2.72, and the corresponding freshwater production rate is 373.8 kg/h.

show abstract

Applying a novel extra-low temperature dedicated outdoor air system in office buildings for energy efficiency and thermal comfort

Cited by 29 publications

References 32 publications

Exergy Analyses and Modelling of a Novel Extra-Low Temperature Dedicated Outdoor Air System

Exergy Analyses and Modelling of a Novel Extra-Low Temperature Dedicated Outdoor Air System

Remote control‐based energy management for energy savings in a central heating system

Energy‐efficient hybrid A/C and freshwater production system proposed for high latent load spaces

Contact Info

Product

Resources

About