Air-side performance of a wavy-finned-tube direct expansion cooling and dehumidifying air coil

Huzayyin, A.S.; Nada, S.A.; Elattar, H.F.

doi:10.1016/j.ijrefrig.2006.07.023

Cited by 28 publications

(21 citation statements)

References 25 publications

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“…Dehumidification efficiency can be described by the equation: (1) where represents condensated vapor mass flow rate (kg/s), is the saturated vapor enthalpy (kJ/kg), is the saturated liquid enthalpy (kJ/kg), represents refrigerant mass flow rate (kg/s), represents evaporator outlet enthalpy (kJ/kg), represents condenser outlet enthalpy (kJ/kg). Moisture extraction rate (MER) is described by the equation:…”

Section: Resultsmentioning

confidence: 99%

“…Most of the studies that have informed evaporator design in heat pump systems involve experimental and numerical approaches, such as Huzayyin et al [1]; Wang et al [2]; Pirompugd et al [3]; Ma et al [4].…”

Section: Introductionmentioning

confidence: 99%

“…Experiments were carried out to study the effects of operating conditions such as: air temperature, air relative humidity, air inlet velocity, and evaporator pressure on the airside performance (cooling capacity, dehumidification capacity, pressure drop, and heat transfer coefficient) of the coil [1].…”

Section: Introductionmentioning

confidence: 99%

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An experimental investigation into the effects of fin structure and surface type on the efficiency of heat exchangers used for dehumidification

Sır¹,

Balio²,

Lu³

et al. 2014

WIT Transactions on Engineering Sciences

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Household tumble dryers are classified into three major categories according to their dehumidification process. Air vented dryers are the most simple and least efficient ones, in which humid air is directly vented to the outside environment, while the condenser tumble dryers have closed air loop with an air-to-air heat exchanger for dehumidification process. Heat pump tumble dryers are the most efficient products in domestic household dryers. In the heat pump systems of these dryers, the heat released from the condenser is used directed to the laundry and evaporator is used for the dehumidification of the humid air leaving the tumble. From the design point of the view, evaporator structure and dehumidification performance have a critical role on improving the heat pump dryer efficiency.In this study, effect of fin type and fin coating of an evaporator which is used for dehumidification process in terms of condensation rate and efficiency has been studied. In order to study the effect of these parameters on dehumidification performance, temperature and air velocity at the inlet of evaporator (respectively 38°C and 1.85 m/s) has been kept constant while varying the relative humidity (65%, 70%, 80%) of inlet air, fin type (plain and wavy) and surface type (hydrophobic and hydrophilic) of evaporators.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An experimental investigation into the effects of fin structure and surface type on the efficiency of heat exchangers used for dehumidification

Sır¹,

Balio²,

Lu³

et al. 2014

WIT Transactions on Engineering Sciences

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“…(1) is zero. The classic Schmidt model [20], with the geometry shown in Figure 3 for a straight fin, has been widely used for finned-tube heat exchanger designs and experimental research [1,12,21,23] heat tanh( ) = , mH η mH (11) where H is the fin height, m. It equals (r o r i ). Then, the equivalent straight fin model has been widely used in a Schmidt model [1,14,24] that includes the effect of the fin equivalent height on the fin efficiency:…”

Section: Dry Fin Conditionsmentioning

confidence: 99%

“…Therefore, the airside heat and mass transfer characteristics of finned-tube heat exchangers have been extensively studied [1][2][3][4][5][6][7][8][9][10] to better optimize the structural parameters, including the fin materials, fin pitch, tube diameters and tube arrangements. There have been many experimental studies [8][9][10][11][12][13][14][15][16][17] of these factors for specific heat exchangers [7] to enhance the heat transfer [18,19] and improve the fin efficiency.…”

Section: Introductionmentioning

confidence: 99%

Airside fin efficiencies for finned-tube heat exchangers with forced convection

Cheng

Zhang

2011

Sci. China Technol. Sci.

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The heat transfer and mass transfer fin efficiencies were analyzed numerically to show that popular models for heat transfer fin efficiency for circular fins are not always reasonable. The numerical results show that the effective heat transfer area of a circular fin increases several times faster than that of a straight fin for the same tube radius. Then, a simple but accurate heat transfer fin efficiency model was developed and verified by numerical results for a wide range of fin designs. This model predicts the heat transfer fin efficiency with absolute errors of less than 1%. The heat transfer and mass transfer fin efficiencies were found to be quite different for typical air flow with low relative humidity. Thus, these two fin efficiencies should not be assumed to be equal and a mass transfer fin efficiency model was developed, based on the heat transfer fin efficiency model. These heat transfer and mass transfer fin efficiencies are very useful for more accurate prediction for a wide range of practical applications. circular fin efficiency, heat transfer, mass transfer, humid air condensation Citation:Li C, Li J M, Zhang H R. Airside fin efficiencies for finned-tube heat exchangers with forced convection.

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Energy‐efficient hybrid A/C and freshwater production system proposed for high latent load spaces

2019

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Summary Huge amount of energies is consumed by the air conditioning (A/C) to maintain the required temperature and humidity inside spaces/applications of high humidly. An innovative A/C system that recovers the condenser heat in process air reheating and other useful thermal utilization is presented and investigated in this paper. For high coefficient of performance (COP) of the AC and more energy‐efficient system, the cold exhaust air rejected by the air condition system is also utilized to cool the condenser of the AC system. Huge amount of the water condensate from the system is also utilized as freshwater production. Performance of the proposed system is analytically investigated for different operating conditions and system capacities. Mathematical model of the systems is developed and solved numerically using Engineering Equation Solver (EES) software. Results show that the proposed system enhances the COP and decreases the electric power consumption. The saving in electric power consumption, COP, and the freshwater production rate of the system increases with decreasing room‐sensible heat factor, fresh air ratio, and outdoor air temperature and humidity. Moreover, the COP of the proposed system is 90% higher than COP of the basis system, and the savings in the running cost of the system increase by 4.5 times with decreasing the room‐sensible heat factor (RSHF) from 0.6 to 0.2. In addition, the highest COP attained by the proposed system is 2.72, and the corresponding freshwater production rate is 373.8 kg/h.

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Air-side performance of a wavy-finned-tube direct expansion cooling and dehumidifying air coil

Cited by 28 publications

References 25 publications

An experimental investigation into the effects of fin structure and surface type on the efficiency of heat exchangers used for dehumidification

An experimental investigation into the effects of fin structure and surface type on the efficiency of heat exchangers used for dehumidification

Airside fin efficiencies for finned-tube heat exchangers with forced convection

Energy‐efficient hybrid A/C and freshwater production system proposed for high latent load spaces

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