Experimental assessment of solar absorption-subcooled compression hybrid cooling system

Yu, Jianting; Li, Zeyu; Chen, Erjian; Xu, Yongrui; Chen, Hongkai; Wang, Le

doi:10.1016/j.solener.2019.04.055

Cited by 34 publications

(7 citation statements)

References 34 publications

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“…The comparison is exhibited in Table 1 and the maximal deviation is 6.3%. Secondly, the modeling of SASCHCS is verified by the experiment data of the prototype [10] in the same condition. It is noted that the CPC is modeled in terms of the reference [29].…”

Section: Validation Of Modelmentioning

confidence: 93%

“…The model is simulated in a MATLAB environment (R2018b, MathWorks, Natick, United States). Because the compound parabolic collector (CPC) is employed to feed absorption subsystems of SASCHCS prototype [10], the validation is divided into two sections. Firstly, the ETC model is verified by the experimental data from the reference [15].…”

Section: Validation Of Modelmentioning

confidence: 99%

“…Consequently, the performance of absorption chillers is enhanced, and more solar cooling power is produced. It is measured by an experiment in which 22.2% of compressor work is saved as compared to vapour compression chiller without subcooling on summer sunny days [10]. It was indicated that the payback period of SASCHCS is close to that of solar photovoltaic cooling (the most economical solution of solar cooling recently) [11].…”

Section: Introductionmentioning

confidence: 99%

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Performance of Solar Absorption-Subcooled Compression Hybrid Cooling System for Different Flow Rates of Hot Water

Zhang

Jing

et al. 2020

Applied Sciences

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The solar absorption-subcooled compression hybrid cooling system (SASCHCS) is tech-economically feasible for high-rise buildings. Since such a system operates with no auxiliary heat source, the performance coupling of its absorption subsystem and solar collectors is sensitive to the variation of hot water flow rate. In this regard, the relationship of system performance and hot water flow rate is required to be clarified exactly. Therefore, this paper aims to illustrate the effect mechanism of hot water flow rate and to propose the corresponding decision criterion. The case study is based on a typical high-rise office building in subtropical Guangzhou. The daily working process of this system with different hot water flow rates is simulated and analyzed. Subsequently, the useful heat of collectors and cooling capacity of the absorption subsystem with the hot water flow rate is discussed in detail. The results show that the SASCHCS operates with hot water temperatures ranging from 60 °C to 90 °C. The energy saving increases with the rise of hot water flow rate, but such variation tends to be flat for the excessively high flow rate. As the collector flow rate increases from 1 m3/h to 10 m3/h, the daily energy saving improves by 21% in August. Similarly, the daily energy saving increases by 37.5% as generator hot water flow rate increases from 1 m3/h to 10 m3/h. In addition, the collector flow rate of 3.6 m3/h (13.33 (kg/m2 h)) and the generator flow rate of 5.2 m3/h (19.26 (kg/m2 h)) are optimal for the annual operation, with considering power consumption of water pumps. This paper is helpful for the improvement of SASCHCS operating performance.

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Section: Validation Of Modelmentioning

confidence: 93%

Section: Validation Of Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of Solar Absorption-Subcooled Compression Hybrid Cooling System for Different Flow Rates of Hot Water

Zhang

Jing

et al. 2020

Applied Sciences

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“…The activation temperature is set to be 5 • C above the set point temperature of the generator hot water. Furthermore, the generator pump is turned off if the outlet temperature of the generator hot water falls to 55 • C because the temperature of hot water is too low to drive absorption subsystems from the experiment [8]. In another hand, the flow rate of the generator hot water is also controlled in terms of the setting temperature of the generator inlet.…”

Section: System Description: Operation Modes and Control Strategiesmentioning

confidence: 99%

“…It is noted that the ETC was placed in the roof, and its installation area was designed to reasonably prevent the interference of each collector. Similar to the reference [33], parameters of absorption and compression subsystems were proportional to its nominal cooling capacity based on the size of our prototypes [8]. The typical monthly solar irradiance, the surrounding temperature, and the average data of annual measurement in our previous study [34] are exhibited in Figures 6 and 7, respectively.…”

Section: Model Validation and Case Studymentioning

confidence: 99%

Effect of Hot Water Setting Temperature on Performance of Solar Absorption-Subcooled Compression Hybrid Cooling Systems

Zhang

Chen

et al. 2019

Applied Sciences

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The solar absorption-subcooled compression hybrid cooling system (SASCHCS) displays outstanding advantages in high-rise buildings. Since the performance coupling of collectors and absorption subsystems is stronger due to the absence of backup heat and the effect of generator setting temperature has not been realized adequately, it is highly important to study the relationship of SASCHCS operation and the set point temperature of hot water to prevent performance deterioration by inappropriate settings. Therefore, the paper mainly deals with the effect of collector and generator setting temperature. The investigation was based on the entire cooling period of a typical high-rise office building in subtropical Guangzhou. The off-design model of hybrid systems was built at first. Subsequently, the impact mechanism of setting temperature in two hot water cycles on facility operation was analyzed. It was found that the excessive rise of collector setting temperature deteriorated the energy saving, while the appropriate improvement of generator set point temperature was beneficial for the solar cooling. Besides, global optimization by the genetic algorithm displayed that 71.6 °C for the collector setting temperature with 64.5 °C for the generator was optimal for annual operation. The paper is helpful in enhancing the operation performance of SASCHCS.

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Differences of energy saving quantities for absorption‐compression hybrid cooling systems with cascade condenser and cascade subcooler

Peng

Zeng

et al. 2021

Int J Energy Res

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Summary Absorption‐compression hybrid cooling systems with cascade condenser and cascade subcooler are able to effectively reduce compressor power by low‐grade heat. However, differences of both energy saving quantities still cannot be explained exactly through various types of coefficient of performance (COP) indicators, which is adverse for the decision‐making of appropriate layouts. In this regard, we attempt to illustrate the above‐mentioned issue from the new standpoint, that is, by decoupling processes and considering the limitation of thermodynamic cycles and refrigerant characteristics. It is found that there is the critical heat quantity corresponding to the order transition of energy saving for both layouts at first. Subsequently, critical heat quantities for different working conditions are obtained and analyzed. Moreover, expressions regarding critical heat quantities for five refrigerants are fitted by the neural network. It is displayed that the average difference between the critical heat quantity for R1234yf, R1234ze(E), R290 and R32 and that for ammonia is 7.89%, 4.08%, 4.78%, and 4%, respectively. The paper is helpful for decision‐making of absorption‐compression hybrid cooling systems with cascade condenser and cascade subcooler to enhance the amount of energy saving for certain quantities of low‐grade heat.

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Experimental assessment of solar absorption-subcooled compression hybrid cooling system

Cited by 34 publications

References 34 publications

Performance of Solar Absorption-Subcooled Compression Hybrid Cooling System for Different Flow Rates of Hot Water

Performance of Solar Absorption-Subcooled Compression Hybrid Cooling System for Different Flow Rates of Hot Water

Effect of Hot Water Setting Temperature on Performance of Solar Absorption-Subcooled Compression Hybrid Cooling Systems

Differences of energy saving quantities for absorption‐compression hybrid cooling systems with cascade condenser and cascade subcooler

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