Design and experimental study of a novel air conditioning system using evaporative condenser at a subway station in Beijing, China

Pan, Song; Pei, Fei; Wei, Yixuan; Wang, Hongwei; Liu, Jiaping; Zhang, Xingxing; Li, Guoqing; Gu, Yaxiu

doi:10.1016/j.scs.2018.09.013

Cited by 28 publications

(9 citation statements)

References 34 publications

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“…- [56] Integrated Part Load Value IPLV A single-number expressing integrated part-load efficiency of air-conditioning or heat pump equipment weighted on different part-load operation conditions. (100%-, 75%-, 50%-, and 25%-part load) - [24,55] Water Transport Factor WTF…”

Section: Coefficient Of Performance Copmentioning

confidence: 99%

Exploring the Applicability of Building Energy Performance Certification Systems in Underground Stations in China

You

Wei

et al. 2022

Sustainability

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To improve the energy efficiency of underground metro stations, and in view of the absence of a comprehensive energy performance evaluation system for underground stations, this study introduced building Energy Performance Certification (EPC) tools into underground stations and conducted a comparative analysis of their applicability. The findings indicated that due to the unique characteristics of underground stations, China’s current EPC system was inapplicable to them. Specifically, (1) for basic items, although evaluation methods were available, due to the limited energy use data for the statistical method, the self-reference method was preferred, but its calculation encountered issues with missing reference values; (2) for prescribed items, the emphasis should be placed on the energy efficiency requirements of energy use systems rather than those of the thermal performance of envelopes; (3) for alternative items, the energy recovery measures related to the heat dissipation of trains and the piston wind should be addressed. Furthermore, a case study was conducted for verification of the proposed energy evaluation method, and the EPC system was updated based on the results of the comparison. The authors hope that this study will help improve China’s energy evaluation methods for underground stations and serve as a reference for expanding the EPC system to include public transportation buildings.

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Section: Coefficient Of Performance Copmentioning

confidence: 99%

Exploring the Applicability of Building Energy Performance Certification Systems in Underground Stations in China

You

Wei

et al. 2022

Sustainability

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“…Figure 9: Ventilation system with inverter equipped in metro stations (adapted from [66]). A recent study has used DX A/C and evaporative condensers together in UMSs [67],…”

Section: Variable Frequency Devices (Vfds)mentioning

confidence: 99%

“…Additionally, the condensing temperature can be decreased due to direct expansion, hence increasing the system's CoP. An economic model has been applied to analyze the effect of using this solution in Beijing, and the results showed that it saved energy by up to 81,022 kWh annually, equaling to 11% of the energy consumption by conventional systems [67]. However, the operation performance of this system is affected by the changing external conditions, such as the air relative humidity and velocity on the condenser side, which limits its operational stability.…”

Section: Direct Expansion Air-conditioning (Dx A/c)mentioning

confidence: 99%

A review on available energy saving strategies for heating, ventilation and air conditioning in underground metro stations

You

Zhang

et al. 2021

Renewable and Sustainable Energy Reviews

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“…The comparison showed that with a 72% relative humidity, nearly 9% energy, could be saved by the application of the evaporative cooler [7]. Overall, evaporative cooling has been the most widely applied and well-studied approach in condenser cooling technology, and various numerical models and experiments have validated its ability to improve the COP of RAC systems [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Performance Simulation Model of a Radiation-Enhanced Thermal Diode Tank-Assisted Refrigeration and Air-Conditioning (RTDT-RAC) System: A Novel Cooling System

Wang,

Hu,

Chen

2023

Energies

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This paper presents a novel technology to improve the energy efficiency of refrigeration and air-conditioning (RAC) systems by applying a condenser cooling approach. The approach is based on the integration of an innovative radiation-enhanced thermal diode tank (RTDT) with a RAC system. The thermal diode tank (TDT), consisting of heat pipes and an insulated water tank, is a passive device to generate cooling water at a minimum night ambient temperature. When the radiation-enhanced heat pipe (RHP) is equipped with the TDT, it becomes an RTDT, which could theoretically lower the water temperature below the ambient temperature. In this study, a radiation-enhanced thermal diode tank (RTDT) is proposed to supply cooling water to the RAC system. Simulation models for the proposed RTDT-assisted RAC (RTDT-RAC) system are developed in order to investigate the impacts of the tank size to cooling capacity (TS/Qc) ratio, day/night ambient temperature fluctuations on the system’s coefficient of performance (COP) and the energy saving percentage (ESP). The results show that a greater day/night ambient temperature difference and a larger TS/Qc value can both enhance the COP and ESP of the RTDT-RAC system. The optimal and threshold TS/Qc values were 1 m3/kW and 0.18 m3/kW, respectively. These findings demonstrate the potential of the RTDT-RAC system to achieve significant energy savings and provide valuable insights for the design and optimization of an RTDT-RAC system.

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Design and experimental study of a novel air conditioning system using evaporative condenser at a subway station in Beijing, China

Cited by 28 publications

References 34 publications

Exploring the Applicability of Building Energy Performance Certification Systems in Underground Stations in China

Exploring the Applicability of Building Energy Performance Certification Systems in Underground Stations in China

A review on available energy saving strategies for heating, ventilation and air conditioning in underground metro stations

Performance Simulation Model of a Radiation-Enhanced Thermal Diode Tank-Assisted Refrigeration and Air-Conditioning (RTDT-RAC) System: A Novel Cooling System

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