Development of an Energy-Saving Occupied-Zone HVAC System (OZ HVAC)

Kwon, Chunkyu; Lee, Chang Won; Foster, Lee; Kwon, Ji Hyun; Shin, Younggy

doi:10.4271/2012-01-0320

Cited by 13 publications

(8 citation statements)

References 1 publication

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“…26 Schematic of secondary loop refrigeration system (Wang et al 2010a) Fig. 27 Occupied-zone HVAC hardware configuration (Kwon et al 2012b) Energy Efficiency et al 2005Hosoz and Direk 2006;Cuevas et al 2012); thus, extra input energy signifies considerable losses and reduces the system performance. This problem can be avoided if the compressor operates at few speeds continuously, depending on the cooling load at a time.…”

Section: Variable Refrigerant Flow Air-conditioning Systemmentioning

confidence: 98%

“…27) with three zones: driver, front passenger, and rear passenger. Fuel economy evaluation during cooling and heating for the driver-zone mode showed 17-20 % reduction in HVAC power consumption compared with the conventional whole-cabin system (Kwon et al 2012b).…”

Section: Secondary Loop Systemmentioning

confidence: 99%

“…Kaushik et al (2011) demonstrated that all of the three micro-cooling/heating strategies, namely, ventilated seat + seatbelt nozzle active, ventilated seat + neck nozzle active, and ventilated seat + front nozzle active, are capable of delivering sufficient overall thermal comfort at a potentially lower A/C energy consumption and yielding reasonably good estimates of overall thermal sensation and comfort perception levels. Kwon et al (2012b) developed an occupied-zone HVAC system based on airflow management technique (as presented in Fig. 27) with three zones: driver, front passenger, and rear passenger.…”

Section: Secondary Loop Systemmentioning

confidence: 99%

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Achieving a better energy-efficient automotive air-conditioning system: a review of potential technologies and strategies for vapor compression refrigeration cycle

et al. 2015

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This article presents a review of potential technologies and strategies to develop an energyefficient automotive air-conditioner based on the vapor-compression refrigeration cycle system. This paper is broadly divided into two sections. The first is a review of component optimization (primary and secondary components) that enhances the energy efficiency of the automotive air-conditioning (AAC) system. The second presents a review of operational management and control that efficiently consumes energy in operating the AAC system while maintaining vehicular thermal comfort satisfaction. Some of the technologies and strategies described in this article are still conceptual and are the subject of ongoing research. However, the growing demand to reduce energy consumption by developing a new AAC system has led to an increasing number of related studies aimed at generating alternative conventional systems in the near future. Keywords Automotive air-conditioning system . Efficient component . Energy efficiency improvement . Operational management Nomenclature A/C Air-conditioning AAC Automotive air-conditioning CRC Conventional refrigerant cycle DEAC Dual-evaporator air-conditioning DX Direct expansion EEV Electronic expansion valve EV Electric vehicle EVDC Externally controlled variable capacity compressor FCC Fixed capacity compressor FDC Fixed displacement compressor FSTPID Fuzzy self-tuning proportional integral derivative HVAC Heating, ventilation, and air conditioning MEC Modified ejector cycle RV Revolving vane SC Standard cycle SEC Standard ejector cycle TEV Thermostatic expansion valve TPERC Two-phase ejector refrigerant cycle VAV Variable air volume VCC Variable capacity compressor VCR Vapor compression refrigeration Energy Efficiency

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Section: Variable Refrigerant Flow Air-conditioning Systemmentioning

confidence: 98%

Section: Secondary Loop Systemmentioning

confidence: 99%

Section: Secondary Loop Systemmentioning

confidence: 99%

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Achieving a better energy-efficient automotive air-conditioning system: a review of potential technologies and strategies for vapor compression refrigeration cycle

et al. 2015

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“…In order to increase the distance that the vehicle can travel during the heating/cooling operation and to improve passenger comfort, heat from outside the vehicle must be blocked effectively. Therefore, there is a need for using suitable thermal insulation management components that can minimize cooling and heating energy loss within the vehicle interiors [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Verification of Use of Vacuum Insulating Material in Electric Vehicle Headliner to Reduce Thermal Load

2019

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In electric vehicles (EVs), the use of high-temperature heat transfer components that effectively block external heat and minimize cooling losses can increase vehicle mileage during heating/cooling operations and improve passenger comfort. In particular, in ensuring high thermal insulation, the car headliner forms an important component for effectively managing environmental heat energy and heating and cooling processes inside the EV. In this study, we have proposed and experimentally verified the use and efficacy of vacuum insulation material in the headliner of EVs to reduce the heat load. The thermal conductivity and air permeability of various conventional insulating and vacuum insulation materials used for the headliner were compared to accurately predict the vacuum insulation material performance. We found that the vacuum insulation material affords reduced surface roughness and thermal conductivity and high formability relative to conventional insulation. We also confirmed consequent improvements in the insulation performance by comparing the characteristics of the proposed vacuum-insulation-material headliner (relative to conventional materials) via prototyping and reliability testing. With the “improved” headliner, in summer, the temperature of the automobile cabin was lowered by 2.8 °C, and the cabin temperature was lowered by 3.9 °C during the cooling period relative to conventional insulators, which proves that the cabin temperature can be maintained at a low value during summer parking or cooling. In winter, the cabin temperature was found to be 7.7 °C higher than that obtained with the conventional insulator, which indicates that the cabin temperature can be maintained higher via reduction in the heat loss (because of using vacuum insulation) under the same heating energy conditions during winter.

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“…Most recently, researchers from Hyundai has looked into modifying the existing air conditioning air distribution to provide zonal cooling (Kwon, Lee, & Foster, 2012). The basic changes were to the HVAC box or the distribution system to allow air to be channelled to the right zones.…”

Section: Vehicle Personalized Ventilation Methodsmentioning

confidence: 99%

A novel cabin air distribution strategy for automotive applications

Lim¹

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I would like to thank my supervisor A/P Ooi Kim Tiow for his dedicated guidance and advice during this period for the project. Most importantly, I greatly appreciate the effort and time he spent sharing non-academic lessons, such as life experiences. The project period has been not only enriching in terms of the honing of technical and academic skills, I have learnt a lot more from him outside this context. Secondly, I would like to thank my wife who has been very supportive during this period. Her patience, understanding and assistance gave me ample time to work on the project despite my busy work schedule. Her encouragement also helped me to push on and complete this project.

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Development of an Energy-Saving Occupied-Zone HVAC System (OZ HVAC)

Cited by 13 publications

References 1 publication

Achieving a better energy-efficient automotive air-conditioning system: a review of potential technologies and strategies for vapor compression refrigeration cycle

Achieving a better energy-efficient automotive air-conditioning system: a review of potential technologies and strategies for vapor compression refrigeration cycle

Experimental Verification of Use of Vacuum Insulating Material in Electric Vehicle Headliner to Reduce Thermal Load

A novel cabin air distribution strategy for automotive applications

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