Experimental study of water vaporization occurring inside a channel of a smooth plate-type heat exchanger at subatmospheric pressure

Giraud, Florine; Toublanc, Cyril; Rullière, Romuald; Bonjour, Jocelyn; Clausse, Marc

doi:10.1016/j.applthermaleng.2016.05.151

Cited by 20 publications

(11 citation statements)

References 10 publications

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“…Most authors reported a very strong influence of the operating conditions on the performance of the machines [17,18,19,20,21]. Experimental studies also reported the appearance of complex phase-change mechanisms when condensing [17] water vapor or during boiling [22,23] of the falling films in soprtion systems. Despite a very strong interest in understanding the inner workings of heat and mass transfer in falling liquid films by the community, either theoretically [24,25,26,27] or experimentally [28,29,30,31], the literature concerning the component scale of the sorption systems remains scarce and further knowledge on the behaviour of the flows inside of falling films exchanger is required.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and modeling of the heat and mass transfer in a grooved flat falling film evaporator

Collignon¹,

Stutz²

2023

International Journal of Refrigeration

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Section: Introductionmentioning

confidence: 99%

Numerical simulation and modeling of the heat and mass transfer in a grooved flat falling film evaporator

Collignon¹,

Stutz²

2023

International Journal of Refrigeration

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“…However, the few available studies have been devoted to investigating the subatmospheric evaporation process in simplified heat exchanger configurations such as smooth tubes [12] and flat plates [13]. These studies focused on falling film [14] and capillary-assisted [14] evaporation processes and, in general, demonstrated the sensitivity of the evaporation rate to different influencing parameters, such as filling level, operating conditions and heat exchange surface type [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Testing of a Falling-Film Evaporator for Adsorption Chillers

et al. 2022

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In this work, the performance of an innovative evaporator based on water falling film was investigated. The studied evaporator has been equipped with a recirculation system to maximise the wetted surface. Tests have been carried out in a lab-scale adsorption unit connected to a test bench recently realised at Politecnico di Milano labs for evaluating heat transfer performances under realistic operating conditions. Several ad/desorption cooling cycles were performed, setting different liquid refrigerant initial contents (0.9–1.5 kg), different chilled water inlet temperatures (7–20 °C) and flow rates (200–1000 L/h) and different adsorbent bed temperatures (25–30 °C). Evaporation performance has been determined in delivered cooling capacity. Moreover, the experimental data were used to calculate the overall evaporator heat transfer conductance (UA). Experiments showed how the heat duty peaks are mainly due to the thermal level of the chilled water that enters the evaporator, not the water content inside it because this value only affects the duration of the process. Instead, the UA value does not depend on the evaporator inlet chilled water temperature and initial mass content inside the evaporator. UA is 540–570 W/K for temperatures of chilled water entering the evaporator, equal to 10–20 °C, and mass of refrigerant of 0.9–1.5 kg.

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“…The copper tube in the evaporator was immersed in a pool of refrigerant as shown in Figure 1. For a given liquid height, there must be a hydrostatic pressure influence that increases the saturation temperature or boiling point [30]. Water is evaporated in a temperature range between 4 °C and 20 ºC, which corresponds to pressures between 0.81 to 2.34 kPa [31].…”

Section: Introductionmentioning

confidence: 99%

Evaporator Performance for Water Refrigerant Adsorption Cooling System

Khanafiah¹,

Sahafudin²,

Jerai³

2022

JMechE

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Adsorption Cooling System gives an alternative to the commercial vapor compression refrigeration cycles due to their benefits of having a very environmentally friendly and promising energy-saving system. An adsorption cooling system consists of four main components which are thecondenser, evaporator, expansion valve, and adsorption bed for the system to effectively function. One of the factors that affect the efficiency of the system is the performance of the evaporator itself as the system operates at sub-atmospheric pressure and the performance is mediocre when using conventional evaporators. Due to the low-pressure condition, hydrostatic pressure may affect the saturated temperature of the water refrigerant in a flooded type evaporator. Therefore, in this study, the performance of the evaporator was investigated based on the water height variation. The highest heat transfer coefficient and evaporation heat transfer rate are achieved when the water is set at the heat exchanger tube diameter level. Furthermore, 0.1 kg of silica gel adsorbent is used to obtain the maximum of 250 W/kg of Specific Cooling Power when the heat transfer fluid is set to 20 ºC.

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Experimental study of water vaporization occurring inside a channel of a smooth plate-type heat exchanger at subatmospheric pressure

Cited by 20 publications

References 10 publications

Numerical simulation and modeling of the heat and mass transfer in a grooved flat falling film evaporator

Numerical simulation and modeling of the heat and mass transfer in a grooved flat falling film evaporator

Testing of a Falling-Film Evaporator for Adsorption Chillers

Evaporator Performance for Water Refrigerant Adsorption Cooling System

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