Theoretical and experimental investigation into anti-idling A/C system for trucks

Bagheri, Farshid; Fayazbakhsh, M.A.; Thimmaiah, Poovanna Cheppudira; Bahrami, Majid

doi:10.1016/j.enconman.2015.03.114

Cited by 14 publications

(5 citation statements)

References 31 publications

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“…(3) and using Eqs. (4) and (5), the time required for the room to reach temperature T a through a process starting from t ¼ t 0 and T a ¼ T a0 is:…”

Section: Model Developmentmentioning

confidence: 99%

See 1 more Smart Citation

Gray-box model for energy-efficient selection of set point hysteresis in heating, ventilation, air conditioning, and refrigeration controllers

Fayazbakhsh

Bagheri

Bahrami

2015

Energy Conversion and Management

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“…(3) and using Eqs. (4) and (5), the time required for the room to reach temperature T a through a process starting from t ¼ t 0 and T a ¼ T a0 is:…”

Section: Model Developmentmentioning

confidence: 99%

“…Moreover, Air Conditioning (AC) is a significant energy consuming unit in vehicles [4]. For a typical vehicle under peak load, the AC energy usage outweighs the energy loss to aerodynamic drag, rolling resistance, and driveline losses, combined [5].…”

Section: Introductionmentioning

confidence: 99%

Gray-box model for energy-efficient selection of set point hysteresis in heating, ventilation, air conditioning, and refrigeration controllers

Fayazbakhsh

Bagheri

Bahrami

2015

Energy Conversion and Management

Self Cite

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“…The geometry of model used in simulation is designed with fins, as displayed in Fig 10. The pre-chilled mass takes 5% of the gas volume. Saturated liquid refrigerant flow with temperature of -1.2°C and pressure of 275.79 kPa [14] is used to chill the mass with 4 different refrigerant mass flow rates tested ranging from 0.0035 kg/s to 0.014 kg/s. For comparison, another case is also simulated with a constant temperature boundary condition (-1.2°C) applied at the wall of the channel, which corresponds to infinite flow rate.…”

Section: Improving Fill Efficiency By Pre-chillingmentioning

confidence: 99%

Thermal Management For Efficient Fast Refill Of Compressed Natural Gas

Lan¹,

Li²,

Joshua³

2018

Progress in Canadian Mechanical Engineering

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As an alternative fuel, compressed natural gas (CNG) plays an important role fueling transportation. Like driving other types of vehicles, drivers of CNG-powered vehicles prefer to refill on-board CNG tanks in a short time, which is referred to as fast refill. Accompanied by a fast pressure increase in the cylinder, temperature will also rise significantly due to re-compression work with limited time for the heat to dissipate. This phenomenon ends with a common problem referred to as under-refill, which means less mass filled than the standards. This article presents a summary of the research works to solve this problem and improve fill efficiency by thermal management. Twodimensional axisymmetric CFD (computational fluid dynamics) simulations of unsteady, compressible, turbulent flow in fast refill process are conducted. Three different types of thermal management concepts are discussed, including active cooling, pre-chilling and real-time chilling. The results show that thermal management is a promising way to mitigate the under-refill problem with a maximum of 7% increase of fill efficiency achieved by active cooling. These provide guidelines for future research on improving fill efficiency through cooling strategies in which real-time chilling should be firstly focused on.

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“…A number of models have been published for different types of refrigeration systems, including domestic refrigerators and refrigerating cassettes [9,10], automotive air conditioning and shipping containers [11][12][13], supermarket refrigeration systems [1,2,14], etc. Although there are numerous studies in the literature focused on refrigeration system in different applications, commercial walk-in freezers have not been well covered.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic investigation of a typical commercial refrigeration system

Bagheri

Fayazbakhsh

Bahrami

2016

2016 32nd Thermal Measurement, Modeling &Amp; Management Symposium (SEMI-THERM)

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In this study, the thermodynamic performance of a typical commercial refrigeration system is investigated and the degradation from design condition is evaluated. A mathematical model is developed to simulate thermal behavior of the refrigeration system and to obtain the coefficient of performance (COP). A number of measuring equipment including thermocouples, pressure transducers, flow meters, and power meters are installed on the refrigeration system to obtain the real-time data for a period of three months. The acquired data is utilized to investigate the thermodynamic behavior of refrigeration system in addition to model validation. A good agreement between the simulation results and the real-time data, with a maximum discrepancy of 9%, is achieved. The results represent a range of 1.1-1.4 for current COP of the refrigeration system under different operating conditions. It is shown that due to degradation, the current COP is lower than design COP by 29%-39% in different duty cycles.

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Theoretical and experimental investigation into anti-idling A/C system for trucks

Cited by 14 publications

References 31 publications

Gray-box model for energy-efficient selection of set point hysteresis in heating, ventilation, air conditioning, and refrigeration controllers

Gray-box model for energy-efficient selection of set point hysteresis in heating, ventilation, air conditioning, and refrigeration controllers

Thermal Management For Efficient Fast Refill Of Compressed Natural Gas

Thermodynamic investigation of a typical commercial refrigeration system

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