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Energy approach analysis of desiccant wheel operation

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Abstract

This paper focuses on desiccant wheel (DW) energy analysis. Numerical modeling is developed for the DW which is the key component of desiccant cooling systems. The mathematical model is validated by experimental results. In this paper, energy effectivenesses of DW are studied as well as energy consumption. An energy relation is developed and used to calculate DW power consumption, which is consisted of both DW drive power consumption and regeneration heat. Trends of energy effectivenesses of DW are presented in the various regeneration temperatures and DW speeds. An energy term is defined by dividing total power consumption to the adsorbed water rate and introduced as “specific adsorption energy (SAE)”. In addition to specific adsorption energy trends in the various regeneration temperatures and DW speeds, Genetic algorithm is used to find the minimmal point of SAE in the range of operating variables. The optimization results show that in the regeneration temperature of 61.9 \(^{\circ }\)C and rotation DW speed of 21.2 (Rph), minimmal SAE of DW is achieved.

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Abbreviations

\(a\) :

Channel height (m)

\(b\) :

Channel width (m)

\(C_{p}\) :

Specific heat (J /kg K)

\(d_{e}\) :

Hydraulic diameter (m)

\(h\) :

Enthalpy (kJ /kg)

\(h_{c}\) :

Convective heat transfer coefficient (W /m\(^{2}\) K)

\(h_{fg}\) :

Latent heat of water vaporization (kJ /kg)

\(K_{y}\) :

Mass transfer coefficient (kg /m\(^{2}\) s)

\(L\) :

Channel length (m)

\(\dot{m}\) :

Air mass flow (kg /s)

\(N\) :

Desiccant wheel rotational speed (Rph)

\(p\) :

Pressure (Pa)

\(P_{t}\) :

Total DW power consumption (kW)

\(q_{st}\) :

Heat of adsorption(J /kg adsorbed)

\(\dot{Q}\) :

Energy rate (kW)

\(Rph\) :

Wheel speed (rev. / h)

\(T\) :

Temperature (K)

\(u_{a}\) :

Air velocity (m/s)

\(v\) :

Specific volume (m\(^{3}\)/kg)

\(W\) :

Desiccant water content (kg/kg)

\(Y_{a}\) :

Air humidity ratio (kg/kg)

\(Z\) :

length direction (m)

\(\delta \) :

Desiccant felt thickness (m)

\(\varepsilon \) :

Felt porosity

\(\rho \) :

Density (kg/m\(^{3})\)

\(\emptyset \) :

Relative humidity (%)

\(\Phi \) :

Desiccant wheel diameter (m)

\(0\) :

Ambient state

\(1-5\) :

States point of air in Fig. 2

\(a\) :

Air

\(d\) :

Desiccant

\(L\) :

Liquid water

\(p\) :

Process

\(r\) :

Regeneration

\(v\) :

Water vapor

\(vs\) :

Saturate water vapor

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Authors and Affiliations

  1. Chemical Engineering Department, Mazandaran University of Science and Technology, Behshahr, Iran

    Mohsen Ali Mandegari

  2. Chemical Engineering Faculty, Tarbiat Modares University, P.O. Box 14155-143, Tehran, Iran

    Hassan Pahlavanzadeh

  3. Environmental Engineering Department, Mohit Zist University Alborz, Karaj, Iran

    Somayeh Farzad

Authors
  1. Mohsen Ali Mandegari
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  2. Hassan Pahlavanzadeh
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  3. Somayeh Farzad
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Correspondence to Mohsen Ali Mandegari.

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Ali Mandegari, M., Pahlavanzadeh, H. & Farzad, S. Energy approach analysis of desiccant wheel operation. Energy Syst 5, 551–569 (2014). https://doi.org/10.1007/s12667-013-0115-z

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