Search Results - "Eckhard, A"

Study of ejector efficiencies in refrigeration cycles by Liu, Fang, Groll, Eckhard A.

“…This paper presents a method of determining internal ejector component efficiencies using a two-phase flow ejector model. The measured performance data…”
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Review of stationary and transport CO2 refrigeration and air conditioning technologies by Barta, Riley B., Groll, Eckhard A., Ziviani, Davide

“…•A review of stationary and mobile CO2 refrigeration and AC is provided.•Thermodynamic justification for architectures and modifications is…”
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Two-stage air-source heat pump for residential heating and cooling applications in northern U.S. climates by Bertsch, Stefan S., Groll, Eckhard A.

“…Air-source heat pumps for residential heating are more widely used than geothermal heat pumps mainly due to their lower installation costs. Major disadvantages…”
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Comparative analysis of battery electric vehicle thermal management systems under long-range drive cycles by Shelly, Tyler J., Weibel, Justin A., Ziviani, Davide, Groll, Eckhard A.

“…•Developed and validated detailed models for battery electric vehicle integrated thermal management systems (BEV ITMS).•Surveyed and evaluated existing…”
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Theoretical analysis of dynamic characteristics in linear compressors by Zhang, Xinye, Ziviani, Davide, Braun, James E., Groll, Eckhard A.

“…Linear compressor technology is characterized by the absence of a crank mechanism, which has gained increasing attention in vapor compression systems due to…”
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A composite heat transfer correlation for saturated flow boiling in small channels by Bertsch, Stefan S., Groll, Eckhard A., Garimella, Suresh V.

“…Recent reviews of flow boiling heat transfer in small tubes and channels have highlighted the need for predictive correlations that are applicable over a wide…”
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Investigation on performance of variable geometry ejectors for CO₂ refrigeration cycles by Liu, Fang, Groll, Eckhard A, Li, Daqing

“…This paper presents a comprehensive study on a controllable two-phase flow ejector component efficiencies and ejector performances in transcritical CO₂…”
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Structure and control co-optimization for an ejector expansion heat pump coupled with thermal storages by Liu, Fang, Deng, Jiaxin, Mo, Qiu, Xu, Yanping, Liu, Dan, Groll, Eckhard A.

“…[Display omitted] Optimal design and control are often coupled tasks for improving energy system performances. There is a lack of study on the structure and…”
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Summary of 2018 Purdue Conferences by Groll, Eckhard A

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A generalized moving-boundary algorithm to predict the heat transfer rate of transcritical CO2 gas coolers by Bahman, Ammar M., Ziviani, Davide, Groll, Eckhard A.

“…•Generalized method presented to predict heat transfer rate and refrigerant temperature of transcritical gas coolers.•Based on the moving-boundary approach to…”
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Considerations on alternative organic Rankine Cycle congurations for low-grade waste heat recovery by Woodland, Brandon J., Ziviani, Davide, Braun, James E., Groll, Eckhard A.

“…When organic Rankine cycles (ORC) are employed to convert waste heat into work, the thermal efficiency is not recommended as a key performance metric because…”
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Design and commissioning of a modular multi-stage two-evaporator transcritical CO2 test stand by Barta, Riley B., Ziviani, Davide, Groll, Eckhard A.

“…•Design and commissioning for a novel transcritical CO2 test stand is presented.•The system is based on multi-stage compression and two-evaporators with open…”
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Performance enhancement of CO2 air conditioner with a controllable ejector by Liu, Fang, Li, Yong, Groll, Eckhard A.

“…This study presents performance enhancement of a transcritical CO2 air conditioner with a controllable ejector at variable operating conditions and variable…”
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Experimental validation and sensitivity analysis of a dynamic simulation model for linear compressors by Zhang, Xinye, Ziviani, Davide, Braun, James E., Groll, Eckhard A.

“…In comparison with other types of conventional positive displacement compressors for domestic refrigerators, oil-free linear compressors have a number of…”
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A pressure and temperature cycling test stand with hot-gas bypass control for evaluation of adhesive joints in HVAC&R applications by Liu, Haotian, Weibel, Justin A., Geoghegan, Patrick, Groll, Eckhard A.

“…The formation of joints is critical to the long-term reliability with leak-free operation of heating, ventilation, air conditioning, and refrigeration (HVAC&R)…”
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Vapor injected compression with economizing in packaged air conditioning systems for high temperature climate by Bahman, Ammar M., Ziviani, Davide, Groll, Eckhard A.

“…•Economized vapor injection (EVI) investigated for application in extreme hot climates.•A packaged air-conditioner retrofitted and tested with an EVI…”
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Multi-objective non-simultaneous dynamic optimal control for an ejector expansion heat pump with thermal storages by Liu, Fang, Qiu, Wenyu, Deng, Jiaxin, Mo, Qiu, Groll, Eckhard A., Zhao, Jun, Liang, Juncui

“…•Dynamic modeling of an ejector expansion heat pump coupled with thermal storages.•Multi-objective non-simultaneous dynamic optimal control for an ejector…”
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Experimental analyses of different control strategies of an R-410A split-system heat pump by employing a turbomachinery expansion recovery device by Barta, Riley B., Ziviani, Davide, Groll, Eckhard A.

“…•An expander in a heat pump model showed greater COP benefit in cooling than heating.•An expander with a variable nozzle was experimentally tested.•The…”
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Fuzzy modeling approach for transient vapor compression and expansion cycle simulation by Kim, Donghun, Ma, Jiacheng, Braun, James E., Groll, Eckhard A.

“…Previous mode switching algorithms for heat exchanger moving boundary models in the literature are composed of a set of IF-THEN rules. These representations…”
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Transcritical CO2 refrigeration cycle with ejector-expansion device by DAQING LI, GRALL, Eckhard A

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