Experimental evaluation on thermal performance of an air-cooled absorption refrigeration cycle with NH 3 –LiNO 3 and NH 3 –NaSCN refrigerant solutions

Cai, Dehua; Jiang, Jinhui; He, Guogeng; Li, Keqiao; Niu, Lijuan; Xiao, Ruxi

doi:10.1016/j.enconman.2016.04.089

Cited by 59 publications

(12 citation statements)

References 26 publications

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“…An interesting experimental analysis to determine the COP of a single-effect absorption machine was performed by Cai et al [9]. They concluded that, as the temperature of the generator increases with time, the pressure in the evaporator increases as time progresses.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of the Performance of a Single-Effect Absorption Refrigeration System Using the Ammonia/Sodium Thiocyanate Couple

Ngock¹,

Tamba²,

Ndjakomo³

et al. 2020

OJEE

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This paper aims at presenting analysis of the thermodynamic of the performance of an absorption refrigeration system of the single-effect ammonia/sodium thiocyanate couple. Since the generator is the starting point for the operation of system, one of the most important point to be addressed in this work is to determine the generator's temperatures at which the system can accept the best quantities and qualities of energy. A mathematical model has been developed to study the performance of the system. Equations obtained from the thermodynamic properties of the ammonia/sodium thiocyanate couple were implemented in Matlab. The analysis consists of determining the effects of the generator's temperature on the energy performance of the system. The computerized performance parameters are the coefficient of performance and the energy efficiency. Results indicate that the coefficient of performance increases with the temperature of the generator. Moreover, these remarks are not observed on the exergetic efficiency, because the latter increases until its maximum value 0.43, in order to decrease until its final value 0.35. In addition, the maximum value of the coefficient of performance tends towards 0.7 with increasing generator temperature. The system admits better operation when the generator temperatures are between 80˚C and 90˚C. The determination of this temperature interval by simulation can be use as a variable setting point in controlling the real system.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of the Performance of a Single-Effect Absorption Refrigeration System Using the Ammonia/Sodium Thiocyanate Couple

Ngock¹,

Tamba²,

Ndjakomo³

et al. 2020

OJEE

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“…Several studies on absorption systems that use NH 3 /LiNO 3 have been conducted, some of which seek to take experimental approaches (Moreno-Quintanar et al, 2011 and2012;Jimenez and Rivera, 2014;Cai et al, 2016;Jiang et al, 2017) while others take theoretical approaches (Acuña et al, 2013;Farshi et al, 2014;Alvarez et al, 2016;Azhar and Siddiqui, 2017;Maryami and Dehghan, 2017;Sabbagh and Gómez, 2018), especially in the direction of creating prototypes. This is seen in the literature (Hernández-Magallanes et al, 2014;Zamora et al, 2014 and.…”

Section: Introductionmentioning

confidence: 99%

“…In the same context, although using a two-stage configuration of a thermodynamic double-effect absorption cycle with ammonia/lithium nitrate, Ventas et al (2016) found that the maximum COP could reach 1.25 when the driven temperature was around 100°C. Cai et al (2016) conducted an experimental study of an air-cooled type single-effect absorption refrigeration cycle that uses two different solutions (NH 3 /LiNO 3 and ammoniasodium thiocyanate) as working pairs, with a view to determining how these influenced the evaporation temperature and capacity of the chiller. conducted a study with a view to proposing a NH 3 /LiNO 3 two-stage double-effect absorption chiller for cogeneration systems that produce electricity and cooling using solar thermal or residual heat as energy sources.…”

Section: Introductionmentioning

confidence: 99%

“…On using this alternative mixture (NH 3 /LiNO 3 ) in absorption systems, some advantages were demonstrated, mainly with respect to the simplicity of the configuration of the cycle, due to excluding the rectifier in absorption systems that use ammonia/water as the working fluid. From this context, numerous experimental proposals were put forward for different applications of these systems, such as thermal comfort and also refrigeration (Domínguez-Inzunza et al, 2014;Hernández-Magallanes et al, 2014;Jiménez and Rivera, 2014;Zamora et al, 2014 andCai et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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ENERGETIC ANALYSIS OF AN ABSORPTION CHILLER USING NH3/LiNO3 AS AN ALTERNATIVE WORKING FLUID

Lima

Ochoa

Costa

et al. 2019

Braz. J. Chem. Eng.

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This paper presents a thermodynamic model developed for a prototype absorption chiller using NH 3 / LiNO 3 with 10 kW of nominal capacity. The study was undertaken using thermodynamic modeling based on the mass and energy balance, takes the overall heat transfer coefficients into consideration and uses the characteristic equation method. First, the results obtained from the thermodynamic modeling developed were compared with those obtained from the characteristic equations of thermal power activation and the cooling capacity. These showed good agreement with the experimental data, there being maximum relative errors of around 5% for most of the operational conditions of the system. Secondly, a parametric analysis was made by altering the variables, such as temperature, mass flow rate, and configuring the heat dissipation that influences the overall performance of the prototype chiller.

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“…A number of researchers have investigated the use of sorption technologies to exploit low grade heat sources for cooling applications. Cai et al [2] studied experimentally a single effect absorption system and results show that NH3-LiNO3 presents COP of 0.15 and minimum evaporation temperature of -13. transfer enhancing technologies have been used [4]. Huizhong et al [5] tested experimentally a solar powered adsorption cooling tube using active carbon/methanol and utilizing heat source temperature of around 110 o C and results show that COP is about 0.11 and the evaporator temperature reached -4 o C. Jribi et al [6] have set up a mathematical model of a 4-bed adsorption chiller using Maxsorb III -CO2 utilizing heat source temperature of 95 o C and results show that COP of 0.1 can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Low grade heat driven adsorption system for cooling and power generation using advanced adsorbent materials

Al-Mousawi

Al-Dadah

Mahmoud

2016

Energy Conversion and Management

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Globally there is abundance of low grade heat sources (around 150 o C) from renewables like solar energy or from industrial waste heat. The exploitation of such low grade heat sources will reduce fossil fuel consumption and CO2 emissions. Adsorption technology offers the potential of using such low grade heat to generate cooling and power. In this work, the effect of using advanced adsorbent materials like AQSOA-Z02 (SAPO-34) zeolite and MIL101Cr Metal Organic Framework (MOF) at various operating conditions on power and cooling performance compared to that of commonly used silica-gel was investigated using water as refrigerant. A mathematical model for a two bed adsorption cooling cycle has been developed with the cycle modified to produce power by incorporating an expander between the desorber and the condenser. Results show that it is possible to produce power and cooling at the same time without affecting the cooling output. Results also show that for all adsorbents used as the heat source temperature increases, the cooling effect and power generated increase. As for increasing the cold bed temperature, this will decrease the cooling effect and power output except for SAPO-34 which shows slightly increasing trend of cooling and power output. As the condenser cooling temperature increases, the cooling effect and power output will decrease while for the chilled water temperature, the cooling load and power generated increased as the temperature increased. The maximum values of average specific power generation (SP), specific cooling power (SCP) and cycle efficiency are 73 W/kgads, 681 W/kgads (using SAPO-34) and 67% (using Silica-gel) respectively. However, MIL101Cr can generate SP and SCP of 95 W/kgads and 1367 W/kgads respectively ,but this case cannot consider to be practical operating conditions, because of using relatively low cooling source temperature, but this material still offers potential of generating power.

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Experimental evaluation on thermal performance of an air-cooled absorption refrigeration cycle with NH 3 –LiNO 3 and NH 3 –NaSCN refrigerant solutions

Cited by 59 publications

References 26 publications

Thermodynamic Analysis of the Performance of a Single-Effect Absorption Refrigeration System Using the Ammonia/Sodium Thiocyanate Couple

Thermodynamic Analysis of the Performance of a Single-Effect Absorption Refrigeration System Using the Ammonia/Sodium Thiocyanate Couple

ENERGETIC ANALYSIS OF AN ABSORPTION CHILLER USING NH3/LiNO3 AS AN ALTERNATIVE WORKING FLUID

Low grade heat driven adsorption system for cooling and power generation using advanced adsorbent materials

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