*3.3.3 Helical pipe heat exchanger for earth to air*

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**.

**Figure 13** represents the contour plot of temperature Distribution of air along the length of helical pipe. The fluid flow analysis of helical pipe heat exchanger for earth to air is evaluated by using the computational fluid dynamic fluent model for cooling mode for the hot and dry climate of the Bikaner region.

The fluid flow and heat transfer analysis for EATHE is performed using the CFD fluent model using a different design condition. The performance is compared in terms of temperature drop and heat transfer rate in **Figure 14**.

**Figure 15** shows the graph of heat transfer rate versus length of earth pipe. The heat transfer rate along the pipe length follows the same trend as the temperature followed. The heat transfer rate is achieved in a straight, spiral, and helical pipe is 10403.86w, 10420.19w, and 10463.79w respectively.

**3.4 CFD analysis of heat exchanger for earth to air for heating space**

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

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

**Figure 15.**

**Figure 16.**

**277**

*Temperature couture plot of straight pipe for heating mode.*

*Graph of heat transfer rate v/s section length.*

Computational model of earth to air heat exchanger has been analyzed for space heating of building. Warmness exchanger for earth to air consists of length, diameter, pipe fabric, and airspeed 20 m, 0.15, PVC and 2 m/s respectively. This all parameter of heat exchanger for earth to air has been executed for locating the thermal. The ambient average temperature of the Bikaner region in the wintertime is 12.80°C. There are 8 thermocouples are inserted in a pipe at an equal distance of 3.14 m to discover the temperature at each section. Air temperature rise in a straight, spiral, and helical pipe is 12.81°C, 13.29°C, and 13.25°C respectively which is shown in **Figure 16**. **Figures 17**–**19** show the temperature couture plot of heat exchanger for the earth to air for heating of building in the winter session.

**Figure 13.** *Contour plot of temperature distribution along helical pipe.*

**Figure 14.** *Graph of temperature v/s length for straight, spiral and helical pipe EATHE.*

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

**Figure 15.** *Graph of heat transfer rate v/s section length.*

**Figure 13** represents the contour plot of temperature Distribution of air along the length of helical pipe. The fluid flow analysis of helical pipe heat exchanger for earth to air is evaluated by using the computational fluid dynamic fluent model for

The fluid flow and heat transfer analysis for EATHE is performed using the CFD fluent model using a different design condition. The performance is compared in

**Figure 15** shows the graph of heat transfer rate versus length of earth pipe. The heat transfer rate along the pipe length follows the same trend as the temperature followed. The heat transfer rate is achieved in a straight, spiral, and helical pipe is

cooling mode for the hot and dry climate of the Bikaner region.

terms of temperature drop and heat transfer rate in **Figure 14**.

10403.86w, 10420.19w, and 10463.79w respectively.

*Heat Transfer - Design, Experimentation and Applications*

*Contour plot of temperature distribution along helical pipe.*

*Graph of temperature v/s length for straight, spiral and helical pipe EATHE.*

**Figure 13.**

**Figure 14.**

**276**

#### **3.4 CFD analysis of heat exchanger for earth to air for heating space**

Computational model of earth to air heat exchanger has been analyzed for space heating of building. Warmness exchanger for earth to air consists of length, diameter, pipe fabric, and airspeed 20 m, 0.15, PVC and 2 m/s respectively. This all parameter of heat exchanger for earth to air has been executed for locating the thermal. The ambient average temperature of the Bikaner region in the wintertime is 12.80°C. There are 8 thermocouples are inserted in a pipe at an equal distance of 3.14 m to discover the temperature at each section. Air temperature rise in a straight, spiral, and helical pipe is 12.81°C, 13.29°C, and 13.25°C respectively which is shown in **Figure 16**. **Figures 17**–**19** show the temperature couture plot of heat exchanger for the earth to air for heating of building in the winter session.

**Figure 16.** *Temperature couture plot of straight pipe for heating mode.*

**Figure 17.** *Temperature couture plot of spiral pipe for heating mode.*

**Figure 18.** *Temperature couture plot of helical pipe for heating mode.*

**Figure 20** illustrates the variations of heat transfer rates along the pipe length of heat exchanger. The heat transfer rate along the pipe length follows the same trend as the temperature followed. The heat transfer rate is achieved in a straight, spiral, and helical pipe is 6974.014w, 7235.335w, and 7213.558w respectively.

• Air temperature falls in straight, spiral, and helical pipe is 19.11°C, 19.14°C, and

• Air temperature rise in the straight, spiral, and helical pipe is 12.81°C, 13.29°C,

• The heat transfer rate achieved in the straight, spiral, and helical pipe are

• The heat transfer rate is achieved in the straight, spiral, and helical pipe is

6974.014w, 7235.335w, and 7213.558w respectively.

10403.86w, 10420.19w, and 10463.79w respectively.

19.22°C respectively.

**Figure 19.**

**Figure 20.**

**279**

*Graph of EATHE temperature v/s length.*

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

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

and 13.25°C respectively.

*Graph of heat transfer rate v/s section length.*
