بحث بعنوان Review Article Study on Calculation Models of Earth-Air
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 بحث بعنوان Review Article Study on Calculation Models of Earth-Air

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أحضرت لكم كتاب
بحث بعنوان
Review Article Study on Calculation Models of Earth-Air
Heat Exchanger Systems
Trilok Singh Bisoniya, Anil Kumar, and Prashant Baredar

بحث بعنوان Review Article Study on Calculation Models of Earth-Air  S_o_c_10
و المحتوى كما يلي :


Energy Centre, Department of Mechanical Engineering, Maulana Azad National Institute of Technology, Bhopal 462051, India
Modeling is very useful tool in order to predict the effect of the operating parameters like pipe length, radius, depth of burial and
air flow rate on the thermal performance and heating/cooling capacity of earth-air heat exchanger (EAHE) systems. Till date many
researchers have carried out a number of studies on calculation models for earth-air heat exchanger systems. The analysis of EAHE
systems started with the development of one-dimensional models. The two-dimensional models came into practice during the
1990s and were replaced by three-dimensional models in recent years. Latest models are dynamic and technically more advanced
which can provide room for all types of grid geometry to produce detailed thermal analysis of EAHE systems. This paper reviews
on calculation models of EAHE systems as of the end of March, 2014.
Conclusions
The earth-air heat exchangers are promising and effective
technology for space conditioning of buildings. It is a device
which utilizes heat capacity of earth effectively. The EAHE
system, if properly designed, can be feasible and economical
option to replace conventional air-conditioning systems as
there is no need of compressors, burners, or chemicals and
only blowers are required to move the air. A well-designed
EAHE can reduce electricity consumption of a typical house
by 30%. Therefore modeling, simulation, and testing of
EAHE systems are very essential for getting optimum output.
EAHEs usually supply more heating and cooling energy than
the primary energy they use for power input for the fan or
pump.
Modeling is very useful tool in order to predict the effect
of the operating parameters like pipe length, radius, depth
of burial, and air flow rate on the thermal performance and
heating/cooling capacity of EAHE systems. In the literature
several calculation models are found to simulate the thermophysical behavior of earth-air heat exchangers. Different
parametric and numerical models for EAHEs have been
published in the last two decades. Simulation models can
be classified as models with an analytical or a numerical
solution of the ground temperature field and mixed models.
The analysis of EAHE systems started with the development
of one-dimensional models. The two-dimensional models
came into practice during the 1990s and were replaced by
three-dimensional models in recent years.
Three-dimensional models are dynamic and technically
more advanced which can provide room for all types of
grid geometry to produce detailed thermal analysis of EAHE
systems but their applicability for design is limited to the
people who are able to use the calculation codes. In 3D models finite volume method was used to solve 3D conduction
equations. Two-dimensional (2D) models allow calculation
of ground temperature at surface and at different depths.
The finite element programs are used in 2D models to solve
two-dimensional conduction problems of EAHE systems. In
one-dimensional model the description of the pipe to derive
a relation between its inlet and outlet temperature is used
and therefore it is very simple to solve and get the design
parameters. It can be concluded that 1D models are simplest
to solve within shortest time period but are not able to
analyze the EAHE system completely. In comparison to 1D
models, 2D and 3D models are time consuming but are able
to produce more accurate results. Presently, 3D models are
more popular among researchers as they are able to handle
any complex problem and provide complete thermal analysis
of the EAHE system.
The performance of EAHE system can further be
improved by integrating it with nonconventional energy
sources like solar, wind energy, and so forth. It may be concluded that proficient use of EAHE systems in amalgamation
with renewable energy sources and newest technology will
play vital role in saving high grade energy consumption
and environment at global level. In this view, it is expected
by authors that this review paper will be very useful to researchers and scientists working in the field of modeling of
EAHE systems used for passive heating/cooling of buildings.


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