*3.3.2 Spiral pipe heat exchanger for earth to air*

**Figure 12** represents the contour plot of temperature distribution in air and the red color denotes the maximum temperature range, and the blue color shows the minimum temperature range.

> (Tinlet, T1, T2, T3, T4, T5, T6, and Toutlet) are inserted in a pipe at an equal distance of 3.34 m to find out temperature at a different section. Spiral pipe heat exchanger

Heat exchanger for the earth to air of helical pipe length, diameter, and velocity

20 m, 0.15 m, and 7 m/s respectively have been used for analysis. The ambient temperature of the Bikaner region is 47.6°C is used for the analysis of heat exchanger for earth to air. There are eight temperature sensors (Tinlet, T1, T2, T3, T4, T5, T6 and Toutlet) are inserted in a pipe at equal distance of 3.14 m to find out temperature at a different section. In a helical pipe heat exchanger for the earth to air, the air temperature falls from 47.60 C to 28.230 C which is shown in **Figure 13**.

for the earth to air, air temperature falls from 47.60 C to 28.310 C.3.3.3.

*3.3.3 Helical pipe heat exchanger for earth to air*

*Contour plot of temperature distribution along spiral pipe.*

*Contour plot of temperature distribution along straight pipe.*

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

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

**Figure 11.**

**Figure 12.**

**275**

Heat exchanger for the earth to an air of spiral pipe length, diameter, and velocity 20 m, 0.15 m, and 2 m/s respectively have been used for analysis. The ambient temperature of the Bikaner region is 47.6°C is used for the analysis of heat exchanger for the earth to air. There are eight temperature sensors


**Table 4.** *Properties of material.* simulation of optimizing the design heat exchanger for the earth to air has been carried out to for finding the temperature of air under the steady-state conditions by keeping the soil around the pipe of the heat exchanger for the earth to air at a constant temperature of 300°K. The fluid flow analysis of optimizing the design heat exchanger for the earth to air system has been considered the outer surface of the soil thickness with 200 mm which is fourth times the diameter of the heat exchanger for the earth to air pipe. The solution of the governing equation shows the temperature profile of fluid which is air with different pipe designs of heat exchanger for the earth to air. Different design of heat exchanger for the earth to air pipe like straight pipe, spiral pipe, and a helical pipe has been selected for analysis. This all types of heat exchanger for the earth to air has been carried out for finding the thermal performance of heat exchanger for the earth to air and find out the optimum design of heat exchanger for the earth to air. The analysis has been performed for hot and dry climate of Bikaner where maximum outdoor temperature was found as 47.6°C and was taken as inlet design temperature for heat exchanger. The various material properties like thermal conductivity, density, and specific heat capacity are used for different types of pipe material is used in

Heat exchanger for the earth to an air of straight pipe length, diameter, and velocity 20 m, 0.15 m and 2 m/s respectively have been used for analysis. The ambient temperature of the Bikaner region is 47.6°C is used for the analysis of heat exchanger for the earth to air. There are eight temperature sensors (Tinlet, T1, T2, T3, T4, T5, T6 and Toutlet) are inserted in a pipe at equal distance of 3.34 m to find out temperature at a different section. Straight pipe heat exchanger for the earth to

**Figure 11** represents the contour plot of temperature distribution in the air. The fluid flow analysis of a straight pipe heat exchanger for the earth to air is evaluated by using the computational fluid dynamic fluent model for cooling mode for the hot

**Figure 12** represents the contour plot of temperature distribution in air and the red color denotes the maximum temperature range, and the blue color shows the

> **Specific Heat Capacity (J/kgK)**

**Thermal Conductivity (W/mK)**

Heat exchanger for the earth to an air of spiral pipe length, diameter, and velocity 20 m, 0.15 m, and 2 m/s respectively have been used for analysis. The ambient temperature of the Bikaner region is 47.6°C is used for the analysis of heat exchanger for the earth to air. There are eight temperature sensors

Air 1.225 1006 0.0242 Sandy Loam Soil (Bikaner) 2215 1260 1.26 HDPE 940 2000 0.4

**(kg/m<sup>3</sup> )**

simulation which is shown in **Table 4**.

and dry climate of the Bikaner region.

**Material Name Density**

minimum temperature range.

**Table 4.**

**274**

*Properties of material.*

*3.3.2 Spiral pipe heat exchanger for earth to air*

*3.3.1 Straight pipe heat exchanger for earth to air*

*Heat Transfer - Design, Experimentation and Applications*

air, air temperature falls from 47.60 C to 28.340 C.

**Figure 11.** *Contour plot of temperature distribution along straight pipe.*

**Figure 12.** *Contour plot of temperature distribution along spiral pipe.*

(Tinlet, T1, T2, T3, T4, T5, T6, and Toutlet) are inserted in a pipe at an equal distance of 3.34 m to find out temperature at a different section. Spiral pipe heat exchanger for the earth to air, air temperature falls from 47.60 C to 28.310 C.3.3.3.
