Pre-industrial development and experimental characterization of new air-cooled and water-cooled ammonia/lithium nitrate absorption chillers

Zamora, Miguel Ángel Baltazar; Bourouis, Mahmoud; Coronas, Alberto; Vallès, Manel

doi:10.1016/j.ijrefrig.2014.06.005

Cited by 41 publications

(42 citation statements)

References 12 publications

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“…The first floor of the building is air-conditioned with a solar system. Fundamentally, the HVAC system consists of two air-cooled single-effect ammonia/lithium nitrate absorption chillers [3] and 50 m 2 of solar thermal collectors. The solar collectors heat up water of a hydraulic circuit.…”

Section: Experimental Solar Air-conditioning Systemmentioning

confidence: 99%

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Real-time estimation of thermal comfort indices in an office building with a solar powered HVAC system

Ruz

Fragoso

Rodriguez

et al. 2015

2015 23rd Mediterranean Conference on Control and Automation (MED)

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This paper presents an interactive software tool to monitor in real-time thermal comfort in buildings. Specifically, the tool is used to estimate predicted mean vote (PMV) and predicted percentage dissatisfied (PPD) indices, which are widely accepted in the framework of thermal comfort and recognized by international standards. In this work, the tool was tested in an office building with an HVAC system based on solar energy. To perform this task, a network architecture that enables communication between different protocols is proposed, with a TCP/IP-Modbus gateway and a web server as the main elements, providing in this way external connectivity and data collection from different sensors. The tool communicates remotely with the renewable system and proposes corrective control indications to maintain the indoorair conditions inside the optimal comfort range. Keywordsthermal comfort; distributed systems; interactive tool; renewable energy and sustainability.978-1-4799-9936-1/15/$31.00 ©2015 IEEE

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Section: Experimental Solar Air-conditioning Systemmentioning

confidence: 99%

“…This technology has the advantage of using environment-friendly fluids as refrigerants (ammonia, water, etc.) [3]. In addition, the use of solar power for cooling and heating machines might play an important role towards decreasing the energy consumption in the building sector [4].…”

Section: Introductionmentioning

confidence: 99%

Real-time estimation of thermal comfort indices in an office building with a solar powered HVAC system

Ruz

Fragoso

Rodriguez

et al. 2015

2015 23rd Mediterranean Conference on Control and Automation (MED)

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“…The authors reported that the proposed system could possibly produce as much as 8 kg of ice per day. Zamora et al 17 also reported the results of a partial-load operation for the systems presented by Zamora et al 16 Hernández-Magallanes et al 18 reported the experimental assessment of an absorption cooling system operating with an ammonia/ lithium nitrate mixture. With the ternary mixture, the solar coefficients of performance were as much as 24% greater than those obtained using the binary mixture.…”

Section: Introductionmentioning

confidence: 99%

“…The system operated at generation temperatures between 75°C and 110°C and achieved evaporator temperatures as low as −11°C. Zamora et al 16 reported the results of two preindustrial absorption cooling systems operating with an ammonia/lithium nitrate mixture. Moreno-Quintanar et al 13 compared the results of the system developed by Rivera et al 12 operating with NH 3 -LiNO 3 and NH 3 -LiNO 3 -H 2 O mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…Only one prototype (Zamora et al 16 ) had PHE involved in the main components, but the thermal COP was only reported to be a function of the mass flow rates of water in the evaporator, generator, and condenser for a single generation and condensation temperature. Only one prototype (Zamora et al 16 ) had PHE involved in the main components, but the thermal COP was only reported to be a function of the mass flow rates of water in the evaporator, generator, and condenser for a single generation and condensation temperature.…”

Section: Introductionmentioning

confidence: 99%

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Parametric analysis on the performance of an experimental ammonia/lithium nitrate absorption cooling system

Jiménez‐García

Rivera

2018

Int J Energy Res

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Summary The present study reports the experimental results of a new absorption cooling system utilizing stainless steel plate heat exchangers in all the main components. The system operated with the ammonia‐lithium nitrate working pair. Several parametric analyses were performed in order to investigate the effect of the generation and condensation temperatures, solution mass flow rate, solution volume and expansion valve aperture on the cooling power, evaporation temperatures, and coefficient of performance (COP). Generation temperatures varied from 80°C to 95°C, while condensation temperatures varied between 20°C and 32°C. The system achieved a cooling power of 3.1 kW, cooling temperatures as low as 6°C, and internal coefficients of performance of approximately 0.62. The cooling power increased 20.3% with an increment of the solution mass flow rate from 1 kg/min to 4 kg/min. From the expansion valve analysis, it was found the cooling power varied from 0.28 to 2.29 kW while the COP varied from 0.032 to 0.23 for the corresponding test conditions.

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Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

2018

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Summary In order to develop compact absorption refrigeration cycles driven by low heat sources, the simulated performance of a microchannel absorber of 5‐cm length and 9.5 cm3 in volume provided with a porous membrane is presented for 3 different solution‐refrigerant pairs: LiBr‐H2O, LiCl‐H2O, and LiNO3‐NH3. The high absorption rates calculated for the 3 solutions lead to large cooling effect to absorber volume ratios: 625 kW/m3 for the LiNO3‐NH3, 552 kW/m3 for the LiBr‐H2O, and 318 kW/m3 for the LiCl‐H2O solutions given the studied geometry. The performance of a complete absorption system is also analyzed varying the solution concentration, condensation temperature, and desorption temperature. The LiNO3‐NH3 and the LiBr‐H2O solutions provide the largest cooling effects. The LiNO3‐NH3 can work at a lower temperature of the heating source, in comparison with the one needed in a LiBr‐H2O system. The lowest cooling effect and coefficient of performance are found for the LiCl‐H2O solution, but this mixture allows the use of lower temperature heating sources (below 70°C). These results can be used for the selection of the most suitable solution for a given cooling duty, depending on the available heat source and condensation temperature.

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Pre-industrial development and experimental characterization of new air-cooled and water-cooled ammonia/lithium nitrate absorption chillers

Cited by 41 publications

References 12 publications

Real-time estimation of thermal comfort indices in an office building with a solar powered HVAC system

Real-time estimation of thermal comfort indices in an office building with a solar powered HVAC system

Parametric analysis on the performance of an experimental ammonia/lithium nitrate absorption cooling system

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

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Pre-industrial development and experimental characterization of new air-cooled and water-cooled ammonia/lithium nitrate absorption chillers

Cited by 41 publications

References 12 publications

Real-time estimation of thermal comfort indices in an office building with a solar powered HVAC system

Real-time estimation of thermal comfort indices in an office building with a solar powered HVAC system

Parametric analysis on the performance of an experimental ammonia/lithium nitrate absorption cooling system

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H2 O, LiCl-H2 O, and LiNO3 -NH3

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Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃