Thermal Analysis of a Solar Powered Absorption Cooling System with Fully Mixed Thermal Storage at Startup

Stanciu, Camelia; Stanciu, Dorin; Gheorghian, Adina-Teodora

doi:10.3390/en10010072

Cited by 16 publications

(20 citation statements)

References 16 publications

(15 reference statements)

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“…were considered for an interior desired temperature of 22 °C. All details are available in paper [10]. The maximum values of the cooling load were met on 15 July and are presented in Figure 2.…”

Section: System Description and Constraintsmentioning

confidence: 99%

“…A certain mass flow rate of main ST fluid leaves the tank and heats the H 2 O-LiBr solution inside the desorber of the ACS, from state 2 to state 3, as shown in Figure 1. As heat is transferred from the main ST fluid to the H 2 O-LiBr solution, the fluid temperature decreases to T G,o and returns the ST. On the other hand, pure H 2 O vapors are leaving the desorber towards the cooling With respect to the previous studied systems [10,13], the water heated inside the PTC might feed either entirely the main ST to increase the water temperature at the desired level, or entirely the secondary ST if the main ST temperature is satisfactory, or both of them at the same time. A temperature sensor installed on the main ST will control the electromagnetic valves EMV to open certain paths for the heat transfer fluid exiting the PTC.…”

Section: System Description and Constraintsmentioning

confidence: 99%

“…The entire system is intended for driving the ACS under this cooling load between 9 am and 6 pm. With respect to the previous studied systems [10,13], the water heated inside the PTC might feed either entirely the main ST to increase the water temperature at the desired level, or entirely the secondary ST if the main ST temperature is satisfactory, or both of them at the same time. A temperature sensor installed on the main ST will control the electromagnetic valves EMV to open certain paths for the heat transfer fluid exiting the PTC.…”

Section: System Description and Constraintsmentioning

confidence: 99%

“…A narrow range of correlated dimensions was found and reported. For the given cooling load, of 4.7 kWp around 2 pm, the longest continuous operation was found to be from 9 am to 5:10 pm for the NH 3 -H 2 O cooling system using 10 m × 2.9 m PTC aperture with a 0.16 m 3 capacity water ST [10], and from 10:30 am to 6 pm for the H 2 O-LiBr cooling system using 6 m × 2.9 m PTC aperture with a 0.22 m 3 water ST [11]. Because of the fact that the water is pressurized, it is important to emphasize that the quantity of water considered in computations was 160 kg and respectively, 220 kg.…”

Section: Introductionmentioning

confidence: 99%

“…The exergetic efficiency of the ACS module in this case varied throughout the simulation day between 0.1 and 0.22 for the NH 3 -H 2 O cooling system [10], and between 0.24 and 0.44 for the H 2 O-LiBr cooling system [11], respectively.…”

Section: Introductionmentioning

confidence: 99%

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Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

Stanciu

Gheorghian

et al. 2017

Entropy

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Abstract:A solar driven cooling system consisting of a single effect H 2 O-LiBr absorbtion cooling module (ACS), a parabolic trough collector (PTC), and a storage tank (ST) module is analyzed during one full day operation. The pressurized water is used to transfer heat from PTC to ST and to feed the ACS desorber. The system is constrained to operate at the maximum ACS exergetic efficiency, under a time dependent cooling load computed on 15 July for a one storey house located near Bucharest, Romania. To set up the solar assembly, two commercial PTCs were selected, namely PT1-IST and PTC 1800 Solitem, and a single unit ST was initially considered. The mathematical model, relying on the energy balance equations, was coded under Engineering Equation Solver (EES) environment. The solar data were obtained from the Meteonorm database. The numerical simulations proved that the system cannot cover the imposed cooling load all day long, due to the large variation of water temperature inside the ST. By splitting the ST into two units, the results revealed that the PT1-IST collector only drives the ACS between 9 am and 4:30 pm, while the PTC 1800 one covers the entire cooling period (9 am-6 pm) for optimum ST capacities of 90 kg/90 kg and 90 kg/140 kg, respectively.

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Section: System Description and Constraintsmentioning

confidence: 99%

Section: System Description and Constraintsmentioning

confidence: 99%

Section: System Description and Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

Stanciu

Gheorghian

et al. 2017

Entropy

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Preparation of binary nanofluid with heat transfer additives by particle surface functionalisation

Muhammad

Bhattacharyya

Endrino³

et al. 2021

emergent mater.

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Current binary nanofluid synthesis methods with heat transfer additives lack an understanding of the chemistry of the nanoparticle-additive-base fluid interaction, which plays a significant role in the adsorption of the surfactant on the nanoparticle surface. Consequently, this leads to the formation of aggregates within the nanofluid after a couple of days, affecting the stability of the colloidal suspension. Here, a lithium bromide-alumina salt-based nanofluid is proposed following a newly developed synthesis method including particle surface functionalisation. The new procedure developed allows the initial preparation of the nanoparticles with the surfactant as the first step (surface functionalisation) and then the preparation of the base fluid with a dispersion stabilising agent (Gum Arabic) separately. This is then followed by the dispersion of the prepared alumina nanoparticles into the base fluid, by stirring and ultrasonication to produce the final nanofluid, lithium bromide-water (LiBr-H2O)-alumina nanofluid. Until now, proper procedures have not been reported for the nanofluid synthesis combining surfactant and dispersant and the chemistry of nanoparticles-surfactant-base fluid interaction, which was thoroughly investigated in the new approach. The fluid prepared by both the conventional and new procedures was characterised and analysed simultaneously. A thermal conductivity enhancement of 3% was achieved by using the surface functionalisation method, with greater particle concentration distribution (number of particles in suspension) of 22.7% over the conventional procedure. It also achieved a 5% decrease in dynamic viscosity. On the other hand, a Mouromtseff number value between 0.7 and 1.8 was obtained for the fluid at 293 K and 373 K temperature range, indicating a strong heat transfer capability. It was apparent from the particle size and concentration distribution analysis conducted that this procedure produced a more stable nanofluid with a high distribution of nanoparticles within the fluid. This allows high improvement of thermal properties of the fluid. Graphical abstract Graphical abstract of a new procedure for nanofluid synthesis with heat transfer additives using the two-step method

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A combined thermal system of ejector refrigeration and Organic Rankine cycles for power generation using a solar parabolic trough

Elakhdar

Landoulsi

Tashtoush

et al. 2019

Energy Conversion and Management

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Thermal Analysis of a Solar Powered Absorption Cooling System with Fully Mixed Thermal Storage at Startup

Cited by 16 publications

References 16 publications

Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

Preparation of binary nanofluid with heat transfer additives by particle surface functionalisation

A combined thermal system of ejector refrigeration and Organic Rankine cycles for power generation using a solar parabolic trough

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