Model-based optimal control of a dedicated outdoor air-chilled ceiling system using liquid desiccant and membrane-based total heat recovery

Ge, Gaoming; Xiao, Fu; Xu, Xin

doi:10.1016/j.apenergy.2011.04.045

Cited by 70 publications

(27 citation statements)

References 28 publications

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“…In search of membranes with the greater selectivity necessary to make this process viable, Zhang et al 18 developed a novel membrane using a polyethersulfone (PES) support layer coupled with a polyvinylalcohol (PVA) active layer, while Bui et al 19,20 later reported the fabrication of a robust hydrophilic PVA/LiCl composite membrane. Other studies explored boosting air-conditioning performance through incorporating membrane-based total heat recovery, 21,22 enabling heat and mass exchange across air streams.…”

Section: Introductionmentioning

confidence: 99%

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

et al. 2017

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Recently, next-generation HVAC technologies have gained attention as potential alternatives to the conventional vapor-compression system (VCS) for dehumidification and cooling. Previous studies have primarily focused on analyzing a specific technology or its application to a particular climate. A comparison of these technologies is necessary to elucidate the reasons and conditions under which one technology might outperform the rest. In this study, we apply a uniform framework based on fundamental thermodynamic principles to assess and compare different HVAC technologies fromGeneration HVAC: Prospects for and Limitations of Desiccant and Membrane-Based Dehumidification and Cooling," Applied Energy, 200:330-346, 15 August 2017.an energy conversion standpoint. The thermodynamic least work of dehumidification and cooling is formally defined as a thermodynamic benchmark, while VCS performance is chosen as the industry benchmark against which other technologies, namely desiccant-based cooling system (DCS) and membrane-based cooling system (MCS), are compared. The effect of outdoor temperature and humidity on device performance is investigated, and key insights underlying the dehumidification and cooling process are elucidated. In spite of the great potential of DCS and MCS technologies, our results underscore the need for improved system-level design and integration if DCS or MCS are to compete with VCS. Our findings have significant implications for the design and operation of next-generation HVAC technologies and shed light on potential avenues to achieve higher efficiencies in dehumidification and cooling applications.

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Section: Introductionmentioning

confidence: 99%

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

et al. 2017

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“…A model based control strategy for a dedicated outdoor air-chilled ceiling (DOAS-CC) system was presented with the aim of optimization of the system performance [17]. The strategy was based on simplified models such as a dehumidifier, regenerator, cooling coil, building, and genetic algorithm in order to optimize the supply air temperature and humidity of zones and the supply water temperature.…”

Section: Solar Assisted Conditioning For Comfortmentioning

confidence: 99%

Solar assisted conditioning of residences with floor heating and ceiling cooling: review and simulation results

Eḡri̇can¹,

Korkmaz²

2015

Int. J. Thermo

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Solar or solar assisted heating and cooling systems are becoming widespread to reduce CO2 emissions. Efficient radiant space heating and cooling systems can be used to decrease the energy bills and improve occupant thermal comfort in buildings. This study uses the TRNSYS program, for the modeling and simulation of solar assisted radiant heating and cooling of a building with the domestic hot water supply, to examine the effects of various parameters on energy consumption. Calculations are performed for a typical meteorological year (TMY) and ten attached houses in Istanbul, Turkey with hot water and chilled water storages on a six minute time step basis. Graphs showing variations of the room temperature and room relative humidity indicate satisfactory thermal comfort. Daily average COP of the absorption cooling system is improved by suitable choice of the type and size of the collectors. Sizes of the hot water and chilled water tanks are also important parameters; their roles are shown by their effect on the discarded portion of the heat from the collectors and the energy amount supplied by the auxiliary heater. It is concluded that the presented model for a solar assisted radiant heating and cooling of ten attached houses, with the domestic hot water supply, natural gas fueled auxiliary heater, hot water and chilled water storage tanks have considerable advantages; these should be maximized by optimizing the sizes of the solar collectors and storage tanks using a simulation program.

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“…Ge et al [8,11] investigated a liquid desiccant-assisted DOAS. They indicated that their system saved 19.4% of the total energy consumption by employing an optimum control strategy.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, in order to enhance the humidity control and energy saving performance of the DOAS, a liquid desiccant-assisted DOAS has been proposed [8][9][10][11]. Liquid desiccant systems are attracting particular interest as an alternative dehumidification technology to conventional vapor compression systems [12,13].…”

Section: Introductionmentioning

confidence: 99%

Energy Saving Potential of a Thermoelectric Heat Pump-Assisted Liquid Desiccant System in a Dedicated Outdoor Air System

2017

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Abstract:The main objective of this study was to develop a thermoelectric heat pump and liquid desiccant system based on a dedicated outdoor air system (THPLD-DOAS). An internally-cooled and -heated liquid desiccant system was used and a thermoelectric heat pump (THP) served as the desiccant cooling and heating energy source for dehumidification and regeneration of the desiccant solution, respectively. In order to investigate the energy-saving potential of the proposed system, its thermal performance and operating energy consumption during the cooling season were compared to those of a conventional dedicated outdoor air system with a ceiling radiant cooling panel system (DOAS-CRCP). Detailed simulations for each system were conducted under hot and humid climatic conditions. Their thermal performance under various room sensible heat factor (RSHF) conditions was evaluated to observe the energy performance, depending on the dehumidification performance, of the liquid desiccant system integrated with the THP. The results showed that the coefficient of performance (COP) of the THP ranged from 0.8 to 1.2 to maintain a sufficient dehumidification rate. The operating energy of the THPLD of the proposed system was 6.6% to 16.0% less than that of the chiller operating energy of a conventional DOAS. Consequently, the proposed system consumed 0.6-23.5% less operating energy compared to the conventional DOAS.

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Model-based optimal control of a dedicated outdoor air-chilled ceiling system using liquid desiccant and membrane-based total heat recovery

Cited by 70 publications

References 28 publications

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

Solar assisted conditioning of residences with floor heating and ceiling cooling: review and simulation results

Energy Saving Potential of a Thermoelectric Heat Pump-Assisted Liquid Desiccant System in a Dedicated Outdoor Air System

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