**2.1 Description of CFD model**

CFD is an authoritative method to locating the heat and mass transfer from a few years. Computational fluid dynamic codes are measured through numerical algorithms which could take a look at fluid waft headaches. Computational fluid dynamics offers numerical outcomes by the utilization of the (PDE) partial differential equations which leading airflow and heat transmission during a discretized arrangement, complicated liquid motion, and therefore the heat transmission guides involved in any warmth exchanger are often detected through a computational fluid dynamic software program, like FLUENT. Computational fluid dynamic codes in fluent cover 3 elements as shown in **Figure 1** [11].

**2.2 Model specifications**

**Figure 1.**

**Figure 2.**

**267**

*Straight pipe heat exchanger for earth to air.*

*CFD flow chart [11].*

The present CFD EATHE model is prepared by using CATIA P3 V5R14. The CATIA is a very important tool for preparing geometry. Since the EATHE model is cylindrical. The model has been considering three parts via outer, middle and, inner which are the material of soil, PVC pipe, and air (fluid) respectively. There are three types of model straight pipe, spiral pipe, and helical pipe heat exchanger for

the earth-to-air model which is shown in **Figures 2**–**7**.

*Earth Air Tunnel Heat Exchanger for Building Cooling and Heating*

*DOI: http://dx.doi.org/10.5772/intechopen.99348*


*Earth Air Tunnel Heat Exchanger for Building Cooling and Heating DOI: http://dx.doi.org/10.5772/intechopen.99348*

earth which can utilize the heat capacities of the earth for heating and cooling conditions. TEATHE is used as a source in the winter and sink in the summer. EATHE can be effectively used as a cooling system if the cooling load requirements are met or else it can assist the cooling systems by saving an enormous amount of energy. Many researchers have found out that EATHE can reduce energy consumption enormously and it can be used for building heating and cooling conditions [4–6]. The important factors which affect the performance of the EATHE system are surface condition, temperature, and moisture [7]. Earth to air heat exchanger model has been developed for calculating thermal performance in cooling mode and CFD model is compared with experimental data, 6.07% variation have found while comparing outlet temperature of earth pipe air heat exchanger in CFD model and experimental setup. This variation may be due to the coefficient of friction of the material which is used in simulation taken, irregularities such as insulation, and joints of experimental set-up [8]. CFD model of different diameters of chlorinated polyvinyl chloride pipes has been used for finding thermal performance of heat exchanger for the earth to air in a cooling mode where temperature fall has reduced while decreasing pip diameter and vice versa [9]. In this work, the CFD model of the earth air pipe heat exchanger has been used for finding thermal performance for building heating and cooling purposes. Temperature fall has occurred in cooling mode is 18.590 C and while heating mode, the temperature rises 12.8°C [10]. In this work, the CFD model was validated with an experimental setup where a maximum variance of 7% between the experimental and simulation results is founded [11]. CFD model of different diameter of chlorinated polyvinyl chloride pipes has used for finding thermal performance of heat exchanger for earth to air in cooling mode where temperature fall has reduced while decreasing pip diameter and

*Heat Transfer - Design, Experimentation and Applications*

CFD is an authoritative method to locating the heat and mass transfer from a few years. Computational fluid dynamic codes are measured through numerical algorithms which could take a look at fluid waft headaches. Computational fluid dynamics offers numerical outcomes by the utilization of the (PDE) partial differential equations which leading airflow and heat transmission during a discretized arrangement, complicated liquid motion, and therefore the heat transmission guides involved in any warmth exchanger are often detected through a computational fluid dynamic software program, like FLUENT. Computational fluid dynamic

• Pre-processor are containing input of a motion hassle to a CFD package with the aid of that means of geometry of the area of interest. The CFD place generating grid to subdivision of fluid place. The place is dividing into several sub-areas. The sub-regions are a grid-iron (or mesh) of cells (or manage

• Solver tactics restricted the transfer capacity method for resolving the main

• put up-processor displays results of the recreations by way of course plots,

codes in fluent cover 3 elements as shown in **Figure 1** [11].

volumes or factors), with or hint the place border.

equations of the liquid flow and heat transmission.

define plots, charts, moving photographs, and many others.

vice versa [12].

**2. Methodology**

**266**

**2.1 Description of CFD model**
