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Dew-Point Evaporative Cooling Systems

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Advances in Air Conditioning Technologies

Part of the book series: Green Energy and Technology ((GREEN))

Abstract

Maisotsenko cycle (M-cycle) is a promising air-cooling technique that can reduce the temperature of airflow to approaching dew-point condition, which was not possible either with direct contact techniques or indirect evaporative methods. M-cycle systems have been employed previously on gas turbines, air-conditioning systems, cooling towers, electronic cooling, etc. Due to the wide application of air conditioning systems, this chapter focuses on the application of M-cycle specifically for air conditioning purpose. Researchers have evaluated the M-cycle cooling characteristics via different methods including analytical solutions, numerical simulations, statistical design methods, and experimental techniques. The salient aspects of these methods are systematically discussed and compared in this chapter. In addition, the current status of the applying the dew-point evaporative cooling systems to meet industrial needs is summarized and some of the future research directions are also identified.

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Abbreviations

A :

Area, m2

c :

Specific heat, J/(kg K)

\(c_{{\text{p}}}\) :

Specific heat at constant pressure, J/(kg K)

\(c_{{\text{v}}}\) :

Specific heat at constant volume, J/(kg K)

d :

Diameter, m

D :

Diffusion coefficient, m2/s

\(D_{{\text{h}}}\) :

Hydraulic diameter, m

ex:

Specific flow exergy, J/kg

E :

Relative error, %

\(\dot{E}\) :

Energy transfer rate, W

\(\mathop {{\text{Ex}}}\limits^{.}\) :

Exergy transfer rate, W

F :

Correction factor

\(F_{{\text{o}}}\) :

Fourier number

\({\text{Gz}}\) :

Graetz number

H :

Height, m

\(H_{t}\) :

Channel height, m

h :

Heat transfer coefficient, W/(m2 K)

\(h_{{{\text{fg}}}}\) :

Latent heat evaporation, J/kg

\(h_{{\text{m}}}\) :

Mass transfer coefficient, m/s

i :

Specific enthalpy, J/kg

j :

Diffusive mass flux, kg/(m2 s)

k :

Thermal conductivity, W/(m K)

\(l_{{\text{e}}}\) :

Characteristic length, m

L :

Channel length, m

\({\text{Le}}\) :

Lewis number

LMTD:

Log Mean Temperature Difference

m :

Mass, kg

\(\dot{m}\) :

Mass flow rate, kg/s

\(\dot{M}\) :

Water evaporation rate, kg/s

\(n\) :

Mass transfer rate, kg/s

\(n^{^{\prime\prime}}\) :

Mass flux, kg/(m2 s)

N :

Number

\({\text{Nu}}\) :

Nusselt number

P :

Pressure, Pa

\(\Pr\) :

Prandtl number

q :

Heat transfer rate, W

\(q^{^{\prime\prime}}\) :

Heat flux, W/(m2 s)

\(\dot{Q}\) :

Cooling capacity, W

\(r\) :

Working air ratio/solution flow ratio

\(R\) :

Specific gas constant, J/(kg K)

\(R_{{\text{m}}}\) :

Membrane diffusion resistance, s/m

\({\text{Re}}\) :

Reynolds number

\({\text{Sc}}\) :

Schmidt number

\({\text{Sh}}\) :

Sherwood number

\(t\) :

Time, s

\(T\) :

Temperature, K

\(u\) :

Specific internal energy, J/kg

U :

Overall heat transfer coefficient, W/(m2 K)

\(\dot{U}\) :

Internal energy transfer rate, W

\(v\) :

Velocity, m/s

\(\dot{V}\) :

Volumetric flow rate, m3/s

\(W\) :

Width, m

\(\dot{W}\) :

Power consumption, W

\(X\) :

Concentration

\(\alpha\) :

Thermal diffusivity, m2/s

\(\delta\) :

Thickness, m

\(\varepsilon\) :

Effectiveness

\(\phi\) :

Relative humidity, %

\(\eta\) :

Efficiency

\(\rho\) :

Density, kg/m3

\(\pi\) :

Dimensionless number

\(\mu\) :

Dynamic viscosity, Pa s

\(\nu\) :

Kinematic viscosity, m2/s

\(\upsilon\) :

Specific volume, m3/kg

\(\omega\) :

Humidity ratio, kg/kg dry air

\(\dot{\omega }\) :

Mole fraction ratio, mol/mol dry air

\(\xi\) :

Ratio between the change of specific enthalpy and the change of wet-bulb temperature, kJ/(kg K)

0:

Initial state/reference state

1:

First stage

2:

Second stage

A:

Air

A:

Area

CV:

Control volume

c:

Constant

d:

Cry channel

D:

Diameter

de:

Dehumidified

dp:

Dew point

e:

Evaporation

ex:

Exergy

f:

Water film

i:

In/inner

l:

Length/liquid

lm:

Log mean

lat:

Latent

m:

Mean/membrane

o:

Out/observation/outer

p:

Product

pl:

Plate

r:

Room

s:

Supply

sa:

Saturation

sf:

Surface

sh:

Shell

st:

Steady-state

sen:

Sensible

th:

Thermal

v:

Vapour

vac:

Vacuum

w:

Wet channel/working/water

wb:

Wet bulb

COP:

Coefficient of performance

DB:

Dry bulb

DP:

Dew point

DPEC:

Dew point evaporative cooling

HMX:

Heat and mass exchanger

HVAC:

Heating, ventilation and air conditioning

MLDD:

Membrane liquid desiccant dehumidification

RH:

Relative humidity

SHR:

Sensible heat ratio

WB:

Wet bulb

COP:

Coefficient of performance

DB:

Dry bulb

DP:

Dew point

DPEC:

Dew point evaporative cooling

HMX:

Heat and mass exchanger

HVAC:

Heating, ventilation and air conditioning

MLDD:

Membrane liquid desiccant dehumidification

RH:

Relative humidity

SHR:

Sensible heat ratio

WB:

Wet bulb

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Kian Jon, C., Islam, M.R., Kim Choon, N., Shahzad, M.W. (2021). Dew-Point Evaporative Cooling Systems. In: Advances in Air Conditioning Technologies . Green Energy and Technology. Springer, Singapore. https://doi.org/10.1007/978-981-15-8477-0_3

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  • DOI: https://doi.org/10.1007/978-981-15-8477-0_3

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