A decade ago Air Conditioners was symbol of luxury. But today due to change in climate, rising temperature, global warming and atmospheric effect the air conditioning of houses has become a necessity.
In common use, an air conditioner is a device that lowers the air temperature. The cooling is typically achieved through a refrigeration cycle, but sometimes evaporation or free cooling is used.
We are using ground coupled heat exchanger for cooling purpose. Ground coupled heat systems are increasingly attracting attention as a renewable energy technology for their high energy efficiency and environmentally friendly mechanism for space cooling and heating applications of building, offices, residential, industries etc. The air passes through the pipes buried at a particular depth gets cooled in summer season and gets warm in winter season. The thermal performance of Ground coupled Heat Exchanger depends mainly on two factors:
1. The climatic conditions and soil properties
2. Operating parameters like air flow velocity, pipe diameter, pipe length and depth of burial.
The climatic conditions and soil properties cannot be changed so, to improve the thermal performance of Ground Coupled Heat Exchangers operating parameters are to be optimized. A considerable amount of electrical energy can be saved if Eco-Friendly Air Conditioner is designed properly.
The main component of Eco-Friendly air conditioner is ground coupled heat exchanger. Among the various types of ground coupled heat exchangers, a vertical ground coupled heat exchanger has been preferred over a horizontal one for residential or commercial buildings that require a large amount of geothermal heating or cooling capacity in a limited installation area. Despite its more installation cost, the vertical system has benefits such as its much smaller area requirement for installation and superior energy efficiency compared to the horizontal system. A typical vertical ground coupled heat exchanger consists of one or two U-type pipes through which heat exchange fluid is circulated. The ground is regarded as an infinite medium with an initial uniform temperature. Heat transfer is simplified as a one-dimensional conduction in the direction perpendicular to the pipe axis.