PERFORMANCE ANALYSIS OF EARTH TUBE HEAT EXCHANGER (original) (raw)
Related papers
2016
This study performs an analysis of Earth Tube Heat Exchangers used to improve the efficiency of heating, ventilation, and air conditioning (HVAC) systems. ETHE can be used in either a heating or cooling mode by taking advantage of a "near constant" ground temperature. The "near constant" ground temperature can be used as either a heat sink to remove heat to cool a building, or as a heat source to heat a building. The outlet temperature of air was determined by using effectiveness of ETHE (ε) which is a function of number of transfer units (NTU). The effectiveness of earth-air heat exchanger is determined by the dimensionless group NTU. The all analysis based on cooling test because of in winter session ETHE was not prepared for input parameter.
A Review on Comparative Study of Earth Tube Heat Exchanger Materials for Cooling of Air
International Journal of Advance Research and Innovative Ideas in Education, 2019
Earth tube heat exchanger systems can be used to cool the building in summer climate and heat the buildings in winter climate. In a developing country like India, there is a huge gap in demand and supply of electricity and rising electricity prices have forced us to look for cheaper and cleaner alternative. Our objective can be met by the use of earth tube heat exchangers and the system is very simple which works by moving the heat from the house into the earth during hot weather and cold weather. Measurements show that the ground temperature below a certain depth remains relatively constant throughout the year. Experimental investigations were done on the experimental set up in Lakshmi Narayan College of Technology, Bhopal. Effects of the operating parameters i.e. air velocity and temperature on the thermal performance of horizontal ground heat exchanger have been studied. For the pipe of 9m length and 0.05m diameter, temperature falling of 3.93 0 C-12.6 0 C in hot weather and temperature rising of 6 o C-10 o C in cold weather have been observed for the outlet flow velocity 11 m/s. At higher outlet velocity and maximum temperature difference, the system is most efficient to be used.
Effects of Parameters on Performance of Earth Air Heat Exchanger System (Eahe): A Review
2015
Earth air heat exchanger or earth tube heat exchanger is a device used to produce heating effects in winter and cooling effects in summer using the ground or soil as a source or sink. Till date many researchers have implemented numerous ideas, conducted experiments on EAHE with different parameters depending on the location and found optimum values of parameters for better performance. The present study reviews the previously conducted studies in terms of performance assessment with effects of various parameters like material of construction, depth from earth surface, velocity of air and length of pipe etc.
Parametric and experimental study on thermal performance of an earth–air heat exchanger
International Journal of Energy Research, 2006
In the present paper a quasi-steady state mathematical model is developed to predict the outlet air temperature and monthly heating and cooling potentials of an earth–air heat exchanger. Monthly values of heating and cooling potentials are estimated by rigorous experimentation throughout the year for composite climate of New Delhi. The uncertainty values are calculated for each month; for December the value is 4.9%. It is observed that there is an 8.9 and a 5.9°C temperature rise and fall during winter and summer due to the earth–air heat exchanger buried at a depth of 1.5 m underground. The correlation coefficient, root mean square of percentage deviation, reduced chi-square and mean bias error have been computed for each month. The values are 1, 3.0%, 0.8 and −0.63 for December. Statistical analysis shows that there is fair agreement between theoretical results and experimental observations for each month. Monthly values of heating and cooling potentials have also been predicted for other climatic conditions in India namely Jodhpur, Chennai, Mumbai and Kolkata. Copyright © 2005 John Wiley & Sons, Ltd.
Review of Earth Tube Heat Exchanger
Earth-air heat exchangers, also called ground tube heat exchangers, are an interesting technique to reduce energy consumption in a building.They can cool or heat the ventilation air, using cold or heat accumulated in the soil. Several papers have been published in which a design method is described. Most of them are based on a discretisation of the one-dimensional heat transfer problem in the tube. Three-dimensional complex models, solving conduction and moisture transport in the soil are also found. These methods are of high complexity and often not ready for use by designers. The temperature of earth at a certain depth about 2 to 3m the temperature of ground remains nearly constant throughout the year. This constant temperature is called the undisturbed temperature of earth which remains higher than the outside temperature in winter and lower than the outside temperature in summer. When ambient air is drawn through buried pipes, the air is cooled in summer and heated in winter, before it is used for ventilation. The earth air heat exchanger can fulfill in both purpose heating in winter and cooling in summer.
A Review on Earth-Air Heat Exchanger
2018
The demands of cooling energy & the thermal comfort requirements are rapidly increasing day by day due to global warming effect. The temperature of earth at a certain depth about 1.5 m to 3 m the temperature of ground remains nearly same throughout the year. This temperature remains more than the outside temperature in winter season and lowers than the outside temperature in summer season. The earth air heat exchanger is the possible approach to reduction of heat loss and for the thermal comfort improvement. Earth air heat exchanger or earth tube heat exchanger is a device used to produce heating effects in winter and cooling effects in summer using the ground or soil as a source or sink. When ambient air is drawn through buried pipes, the air is cooled in summer and heated in winter, before it is used for ventilation. The earth air heat exchanger can full fill in both purposes heating in winter and cooling in summer. This paper focus on the effects of various parameters on performa...
Performance analysis of earth–pipe–air heat exchanger for summer cooling
Energy and Buildings, 2010
Earth-pipe-air heat exchanger (EPAHE) systems can be used to reduce the cooling load of buildings in summer. A transient and implicit model based on computational fluid dynamics was developed to predict the thermal performance and cooling capacity of earth-air-pipe heat exchanger systems. The model was developed inside the FLUENT simulation program. The model developed is validated against experimental investigations on an experimental set-up in Ajmer (Western India). Good agreement between simulated results and experimental data is obtained. Effects of the operating parameters (i.e. the pipe material, air velocity) on the thermal performance of earth-air-pipe heat exchanger systems are studied. The 23.42 m long EPAHE system discussed in this paper gives cooling in the range of 8.0-12.7 8C for the flow velocities 2-5 m/s. Investigations on steel and PVC pipes have shown that the performance of the EPAHE system is not significantly affected by the material of the buried pipe (pipe). Velocity of air through the pipe is found to greatly affect the performance of EPAHE system. The COP of the EPAHE system discussed in this paper varies from 1.9 to 2.9 for increase in velocity from 2.0 to 5.0 m/s. ß
Performance analysis of earth–pipe–air heat exchanger for winter heating
Energy and Buildings, 2009
Earth-pipe-air heat exchanger (EPAHE) systems can be used to reduce the cooling load of buildings in summer. A transient and implicit model based on computational fluid dynamics was developed to predict the thermal performance and cooling capacity of earth-air-pipe heat exchanger systems. The model was developed inside the FLUENT simulation program. The model developed is validated against experimental investigations on an experimental set-up in Ajmer (Western India). Good agreement between simulated results and experimental data is obtained. Effects of the operating parameters (i.e. the pipe material, air velocity) on the thermal performance of earth-air-pipe heat exchanger systems are studied. The 23.42 m long EPAHE system discussed in this paper gives cooling in the range of 8.0-12.7 8C for the flow velocities 2-5 m/s. Investigations on steel and PVC pipes have shown that the performance of the EPAHE system is not significantly affected by the material of the buried pipe (pipe). Velocity of air through the pipe is found to greatly affect the performance of EPAHE system. The COP of the EPAHE system discussed in this paper varies from 1.9 to 2.9 for increase in velocity from 2.0 to 5.0 m/s. ß
Theoretical Analysis to Enhance the Effectiveness of Earth Tube Heat Exchanger
International Journal of Engineering Research in Mechanical and Civil Engineering (IJERMCE)
The temperature of atmosphere fluctuating continuously because the changing of environment, due to global warming effect that is uncomfortable for human beings. For comfort zone of human being air conditioning is use in summer season and heater is use in winter season. There for air conditioning and heater required high grade energy as well as high maintenance cost. Now replacing these devices by Earth tube heat exchanger. Earth tube heat exchanger is a device which is producing cooling effects in summer season and heating effects in winter season by passing the ambient air through the pipes inside the ground or soil as a source or sink of heat. According to previous research (IJERTCONV5IS02011) the effect of temperature at a certain depth about 2 m to 5 m remain nearly same throughout the whole year. The temperature inside the earth surface is greater than the atmospheric temperature in winter and less than the summer. Till date many researchers have done extensive research on Eart...
2015
Ground earth air heat exchangers are the emerging technique which reduce the cooling and heating load of buildings in summer and winter season and thus reduce the overall energy consumption in a building. The earth air pipe heat exchanger (EAPHE) control the ventilation air temperature using the geothermal heat energy of the earth. In this paper experimental set up of earth air pipe heat exchanger (EAPHE) installed to find the performance analysis of ventilated air at different operating conditions. The performance analysis of earth air pipe heat exchanger(EAPHE) done by varying the various parameters like air velocity, mass flow rate, depth of the pipe and material of the pipe etc. The results obtained revealed that the temperature inside the earth can be increased by 8-10 0 C during winter season and can be decreased by 12-13 0 C during summer seasons compare to air atmospheric temperature. In this work the main work is to implement the water jacket around the pipe at the exit sec...