Experimental and numerical analysis of a helical coil heat exchanger for domestic refrigerator and water heating

Missaoui, Sami; Driss, Zied; Slama, Romdhane Ben; Chaouachi, Béchir

doi:10.1016/j.ijrefrig.2021.10.015

Cited by 21 publications

(9 citation statements)

References 18 publications

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“…In addition, the accuracy of experimental measurement usually depends on many technical aspects. Therefore, the uncertainty pertaining to the measuring tools can be estimated using the resultant uncertainty presented by the following formula [3]:…”

Section: Error and Uncertainty Analysismentioning

confidence: 99%

“…Today, in residential and commercial buildings, the total energy consumed for heating and air conditioning are about 42 % and 40 % respectively [1,2]. According to Missaoui et al [3], energy conservation coupled with waste heat recovery from condenser coil of refrigeration machines become a promising and simple economic method compared with conventional methods in the field of water heating and seawater desalination. Due to the important heat transfer in the immersed heat exchanger of the refrigeration machines, many investigations on waste heat recovery from refrigeration machines are available in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…3 shows the shape of the modified condenser of the air-conditiong for seawater distillation. The condenser is made up of a smooth copper spiral coiled tubes.…”

mentioning

confidence: 99%

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Experimental study of a coupled unit for space cooling and water desalination

Missaoui

Driss²,

Romdhane

et al. 2023

Preprint

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The waste heat recovery from condenser of air conditioning for seawater desalination is attractive because of its great energy and environmental value. This paper experimentally investigated a modified air conditioner with a desalination unit that operates in the space-cooling and seawater distillation. The experimental investigation was used to study the performance of the system for water distillation, the flow rate of the potable water and the amount of energy saving during the desalination process. The results confirmed that the temperature in the tank is equal to 72°C. With continuously used air conditioning, this value may become better. In these conditions, the maximum coefficient of performance (COP) of the air conditioning was around 6.11. In the integrated system, the potable water production rate was 730 ml/h. The proposed system provides the possibility to save energy which would lead to low cost of fresh water. Indeed, the GHG emissions were reduced.

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Section: Error and Uncertainty Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study of a coupled unit for space cooling and water desalination

Missaoui

Driss²,

Romdhane

et al. 2023

Preprint

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“…In this new paper, we focus on the geometrical parameter effect and we have to change the pipe turns and keep constants all the other parameters. Based on our anterior study [30], we have chosen the time step size with a value equal to Δt =1 s.…”

Section: Meshmentioning

confidence: 99%

Effects of pipe turns on vertical helically coiled tube heat exchangers for water heating in a household refrigerator

Missaoui

Driss

Slama

et al. 2022

Int. J. Air-Cond. Ref.

Self Cite

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A new coupled numerical model of the overall vapor-compression cycle and water heater was developed in order to analyze the influence of condenser coil designs on the heat transfer process of a helical coil heat exchanger immersed in a storage tank. The model was developed using the CFD code ANSYS Fluent. In the numerical simulation, the helical condenser coil was treated as an internal heat source and the initial heat flux was obtained from experimental results and delivered to each coil element in the CFD model as boundary condition.The coupled model was validated with experimental results and showed that the numerical results of the proposed model are in good agreement with the experimental data with the deviation of ± 1.6%. Then, the impact of the main representative geometrical parameter on the overall heat transfer coefficient and water temperature distribution was investigated. The results indicated that the temperature distribution and overall heat transfer coefficient increase with the increase of the pipe turns of a helically coiled tube heat exchanger.

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“…( 11)) on the basis of constant temperature boundary conditions were used. Missaoui et al, [48] numerically and experimentally compared normal coil with coil having variation in pitch and found out that average heat transfer coefficients of coil having variation in pitch was 16.7 % higher than normal coil. Omri et al, [49] carried out experimentation to study enhancement of thermal performance of single straight helical coil using flow of nanofluids in laminar regime.…”

Section: Introductionmentioning

confidence: 99%

Suggestion of Correlations to Obtain Shell and Tube Side Nusselt Numbers in Coiled Heat Exchangers

Magar Susheel Madhavrao,

Gugliani Gaurav Kumar,

Navthar Ravindra Rambhau

2024

ARFMTS

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In coiled tube heat exchangers increase in curvature ratio and effective contact of shell fluid with coil surface led to better thermal characteristics. This work addresses study of thermal performance, shell and tube heat transfer coefficients (ho and hi). Also, mathematical correlations are predicted to obtain shell and tube Nusselt numbers (Nuo and Nui). In the designing of compact coiled heat exchangers consisting of straight helical coil (SHC), conical coil (CC) and spiral coil knowledge of Nuo and Nui is necessary whereas mathematical correlation to calculate Nuo considering variations in shell geometry is not found. Five heat exchangers consisting of three cone coils (angle, ϴ = 30°, 50° and 70°), spiral coil (ϴ = 0°) and SHC (ϴ = 90°) are tested. Using Wilson plot method ho and hi are obtained for wide range of tube side Reynolds numbers (Rei = 3700 - 21000). It is observed that, highest ho is obtained for ϴ = 30°CC with better thermal performance. Lowest ho is obtained for ϴ = 90°SHC. Ratio of height of shell, Hs and diameter of shell, Dso is considered in prediction of single correlation as: Nuo = 16.55.Reo0.55.Pro0.4 *(Hs/Dso)0.096. Comparison with experimental findings shows variation of 0-14%. Similarly two correlations are proposed as: Nui = 0.0512.Rei0.80.Pri0.4.CRave0.18 and Nui = 0.0365.Dei0.815.Pri0.4.CRave-0.3. A fair agreement is found with existing researchers.

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Experimental and numerical analysis of a helical coil heat exchanger for domestic refrigerator and water heating

Cited by 21 publications

References 18 publications

Experimental study of a coupled unit for space cooling and water desalination

Experimental study of a coupled unit for space cooling and water desalination

Effects of pipe turns on vertical helically coiled tube heat exchangers for water heating in a household refrigerator

Suggestion of Correlations to Obtain Shell and Tube Side Nusselt Numbers in Coiled Heat Exchangers

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