Portable personal conditioning systems: Transient modeling and system analysis

Dhumane, Rohit; Ling, Jiazhen; Aute, Vikrant; Radermacher, Reinhard

doi:10.1016/j.apenergy.2017.10.023

Cited by 16 publications

(5 citation statements)

References 58 publications

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“…No change in energy costs was accounted to the same ventilation rates with and without personalized ventilation and thereby clearly looking solely at the running energy costs [71], [93]. Few papers conducted payback or break-even-costs analysis concluding that for a given autonomously heated and cooled office seat, the break-even-costs range between 50US$ and 200US$ [40] and that the payback period for portable PCS are between 1 year and 6 years [158], [169]. Both break-even-costs and payback periods were analyzed for an US-American context related to energy costs and shown to be highly dependent on the outdoor climatic conditions.…”

Section: Economics Of Pcsmentioning

confidence: 99%

Personal comfort systems: A review on comfort, energy, and economics

Rawal

Schweiker

Kazanci

et al. 2020

Energy and Buildings

135

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Section: Economics Of Pcsmentioning

confidence: 99%

Personal comfort systems: A review on comfort, energy, and economics

Rawal

Schweiker

Kazanci

et al. 2020

Energy and Buildings

135

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“…From the results of several tests, the authors certified that the capacities of the condenser were very similar amongst the different analyzed types, with variances lower than 5%. Similar applications have been analyzed in the works of Dhumane et al [25,26] and Quiao et al [27].…”

Section: Introductionmentioning

confidence: 58%

Experimental Characterization and Numerical Simulation of a Low-Scale Personal Cooling System with Integrated PCM

Miccoli,

Cavargna,

Mongibello

et al. 2024

Energies

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Phase Change Materials (PCMs), among the existing thermal storage technologies, are characterized by higher storage densities than conventional storage systems, and absorb and release thermal energy at nearly constant temperatures. In recent years, the potential advantages that can be obtained by the integration of these materials into refrigeration machines have attracted the attention of specialized literature. Indeed, PCMs can allow a more efficient operation through an appropriate increase in thermal inertia, for applications relative to air conditioning in both internal residential environments and inside vehicles for the transport of people, and also in the case of machines used in the field of food refrigeration. Furthermore, in recent years, innovative solutions with integrated PCM have also been analyzed, aiming at enhancing the usability and transportability of refrigeration systems, as well as increasing the energy efficiency and reducing environmental impact. In this context, the present work focuses on the experimental characterization and numerical simulation of a cooling system with integrated PCM. In particular, the cooling system, designed for a personal cooling application, is experimentally analyzed by varying the configuration of the PCM-based condenser, while the numerical simulations have been realized to validate a simulation tool that could be used for the design and optimization of the PCM condenser configuration. The results allow us to identify the main characteristics of the analyzed personal cooling system, namely, the cooling capacity and operating autonomy, and to point out the utility and the limits of the developed simulation tool. Among the various configurations analyzed, the best one in terms of refrigeration power and autonomy is the one characterized by the highest heat transfer surface of the heat exchanger, with the refrigerant compressor at 50% power.

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“…The COP for complete cooling and recharge operation decreases by 30-35% on switching from thermosiphon to heat pump operation. RoCo enables elevation of set-point temperatures of buildings without compromising occupant thermal comfort and can provide savings in the range of 10-30% on the building air conditioner (Dhumane et al, 2017a). The building air conditioners typically consume power in the range of kWh.…”

Section: Heat Pump Rechargementioning

confidence: 99%

“…Personal conditioning systems (PCS) have potential to save building energy in the range of 10-30% by elevating building thermostat. Dhumane et al (2017a) modeled four different PCS with potential to save building HVAC in the range of 10-30% by elevating building thermostat set-points by 4°F (2.2°C). Roving Comforter (RoCo) is one such PCS, which uses vapor compression cycle (VCC) to generate cooling.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Recharge Options for Phase-Change Material Storage of a Personal Conditioning System

Dhumane

Qiao

Muehlbauer

et al. 2019

Science and Technology for the Built Environment

Self Cite

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Buildings consume about two-fifths of the primary energy in the United States with space heating and cooling taking up one-third of that fraction. Global warming and the associated climate changes have necessitated a rethinking of our energy consumption patterns. Roving Comforter (RoCo) is one such technology being developed with this objective. It enables buildings to save 10-30% of HVAC (Heating, Ventilating, and Air Conditioning) loads by enabling elevation of temperature set-points without compromising occupant comfort. The cooling operation involves an R134a vapor compression cycle operation, which stores the condenser heat into a phase change material (PCM) based thermal storage. Previous studies focused on enhancing the PCM to reduce the recharge time by thermosiphon operation from 8 hours for non-enhanced version by 40% without a significant increase in the weight of the thermal storage. This enhanced PCM storage needs to be recharged before the next cooling operation, which may be conducted in two different ways. A gravity-assisted two-phase thermosiphon operation consumes very less power takes a longer recharge time (6.5 hours) in comparison to a reverse heat pump operation which consumes more power in a much shorter operation time (2.5 hours). The current article uses a validated dynamic model of thermosiphon and heat pump in Modelica to evaluate the overall coefficient of performance for combined cooling and recharge operations. Reduced recharge time from the heat pump recharge leads to increased frequency of the cooling operation enabling savings on building HVAC energy. All these factors are considered in making design recommendations for future prototypes of RoCo, which will save additional energy and provide longer cooling operation to the current prototypes. The modeling framework discussed in the article being generic may be used by researchers investigating vapor compression cycle integration strategies with PCM thermal storages. The article provides interesting insights and quantification of benefits obtained from various strategies adopted for improvement over the first prototype.

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Portable personal conditioning systems: Transient modeling and system analysis

Cited by 16 publications

References 58 publications

Personal comfort systems: A review on comfort, energy, and economics

Personal comfort systems: A review on comfort, energy, and economics

Experimental Characterization and Numerical Simulation of a Low-Scale Personal Cooling System with Integrated PCM

Evaluating Recharge Options for Phase-Change Material Storage of a Personal Conditioning System

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