Comparison of performance characteristics of desiccant coated air-water heat exchanger with conventional air-water heat exchanger – Experimental and analytical investigation

Sun, Xiangyu; Dai, Yanjun; Ge, T.S.; Zhao, Yao; Wang, Ruzhu

doi:10.1016/j.energy.2017.03.078

Cited by 50 publications

(6 citation statements)

References 18 publications

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“…When the airflow increases, the latent load increases significantly, and the sensible load also increases, and thus the cooling capacity increases where the increase was 65%, see Figure (13 a). Because the amount of air to be cooled increases with the same amount of water in the exchanger, the rate of heat transfer between air and water increases, and thus the (COPth) increases, see Figure (13 b), until it reaches the highest value (3.5) at the flow of (0.48 m³/s) [24]. Figure 14 shows the effect of hot water flow rates inside the heat exchanger on the coefficient of thermal performance.…”

Section: Cooling Capacity and Cop Thermalmentioning

confidence: 99%

“…Five hot water temperatures were tested (45, 50, 55, 60, and 65 °C), with constant water flow (0.05 l/s) and airflow (0.48 m³/s). Increasing the water temperature requires more energy consumption due to the increase in the temperature difference between the water entering and leaving the heat exchanger, which leads to an increase in the regeneration energy and a decrease in the COPth because the relationship between them is inverse [24][25][26].…”

Section: Cooling Capacity and Cop Thermalmentioning

confidence: 99%

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Study the Performance of a Novel Desiccant Heat Exchanger

Taresh¹,

Abdul-Zahra²,

Saleh³

2022

ETJ

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 A silica gel-coated heat exchanger was used for air drying purposes.  The most important effects studied are the air flow rate in the process of dehumidifying and regeneration of silica gel, hot and cold water flow, and the regeneration temperature.  The results proved that the heat exchanger could remove moisture from the air and work efficiently in hot and humid areas.Conserving energy and reducing emissions has become a global consensus. However, most air conditioning systems are highly energy-consuming, affecting global warming and the ozone layer because they use chlorine and fluorine refrigerating fluids. Evaporative cooling systems are one of the most important environmentally friendly air conditioning systems with low energy consumption. However, their performance is negatively affected by the high humidity of the inlet air. One of the solutions to control the relative humidity of the inlet air is using desiccant material. In this paper, a silica gel-coated heat exchanger was designed and constructed as a dehumidifying unit. The effect of airflow rate, hot water flow rate, cold water flow rate, and regeneration temperature on the system's performance has been studied. It was found that increasing the hot water flow rate improves the removing moisture from the desiccant. However, increasing the hot water flow rate has a negative effect on the thermal performance of the heat exchanger. The effectiveness of the heat exchanger was 53% in the regeneration phase and 52% in the cooling phase for the outside air temperature of 40 ºC, W=20 g/kg, and an airflow rate of 0.48 m³/s. From the results shown above, it was noticed that the system could work efficiently in hot and high humidity climates and be used in Iraqi weather.

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Section: Cooling Capacity and Cop Thermalmentioning

confidence: 99%

Section: Cooling Capacity and Cop Thermalmentioning

confidence: 99%

Study the Performance of a Novel Desiccant Heat Exchanger

Taresh¹,

Abdul-Zahra²,

Saleh³

2022

ETJ

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“…In order to avoid the fresh air dehumidification and to improve air conditioning efficiency, several studies have been done about coating desiccant on the surface of evaporators and condensers [18,19]. Chai et al combined a desiccant coated heat exchanger (DCHE) with a heat pump for energy saving [20].…”

Section: Introductionmentioning

confidence: 99%

A novel metal-organic frameworks based humidity pump for indoor moisture control

Hou

Qin

et al. 2021

Building and Environment

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“…They showed that, with the decreasing of minichannels height and with increasing the number of minichannels, the overall heat transfer performance improves. The influence of twisting and segment of fin on the efficiency of the serrated finned tube were numerically investigated by Lemouedda et al 7 Sun et al 8 investigated the contrastive analyses of the heat transfer coefficients of a conventional fin-and-tube heat exchanger and desiccant-coated heat exchanger. They reported that, because of the thermal resistance of the desiccant coating, the rate of heat transfer of desiccant-coated heat exchangers was lowered by 30% in comparison to the conventional one.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement of finned‐tube heat exchanger using nozzle‐ and diffuser‐shaped fins instead of straight fins

Jalil

Goudarzi

2021

Heat Trans

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In this paper, a new method has been used to improve the heat transfer rate in the finned-tube heat exchanger with nozzle-and diffuser-shaped arrangement. For this study, the effect of several parameters was studied numerically. For the computational fluid dynamics simulation, the continuity, momentum, and energy equations were solved by the finite volume method using the standard k-ԑ model. The rate of heat transfer increases with the decreasing of fin bend radius (15 < R fb < 20) for both nozzleshaped fin and diffuser-shaped fin. By increasing of side temperature (600 < T side < 900) and side Reynolds number (2000 < Re side < 5000) the heat transfer rate increased for both nozzle-and diffuser-shaped fins. Results showed that a nozzle-shaped fin with a fin bend radius of 15 mm under the condition of Re in = 20,000, T side = 900 K, and Re side = 3400 has a higher effect on heat transfer in comparison with the other types of fins. The maximum heat transfer rate was almost 39% and 35% for the nozzle-shaped fin with a bend radius of 15 mm and diffuser-shaped fin with a bend radius of 15 mm compared with the simple tube, respectively. Finally, correlational equations have been suggested to forecast the average Nu number as functions of various parameters of the tube equipped with different types of outer fins involving nozzle-and diffuser-shaped.

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Comparison of performance characteristics of desiccant coated air-water heat exchanger with conventional air-water heat exchanger – Experimental and analytical investigation

Cited by 50 publications

References 18 publications

Study the Performance of a Novel Desiccant Heat Exchanger

Study the Performance of a Novel Desiccant Heat Exchanger

A novel metal-organic frameworks based humidity pump for indoor moisture control

Heat transfer enhancement of finned‐tube heat exchanger using nozzle‐ and diffuser‐shaped fins instead of straight fins

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