Manan Shah

Model design of condenser for solar assisted geothermal cooling system using software simulation

Condensers are extensively used in refrigeration, air-conditioning and power generation systems. Condenser for the solar assisted geothermal cooling system is designed by using software simulation of condenser’s geometrical and flow parameters. The geothermal cooling system is designed to reduce electricity consumption of compressor during peak hours during the summer period in hot weather condition. The subsurface temperature of the earth around 5–6-m depth is fairly constant throughout the year which fulfills the requirement of cooling inside the building or residence by using water as a heat exchanging medium. Water is circulated in closed loop system buried into subsurface which sinks the heat of refrigerant from condenser inside the subsurface soil. The condenser is designed by comparing results obtained from (1) manual calculation (2) simulation by CHEMCAD software. In order to have a good and optimized design, manual and software-based calculations should be carried out simultaneously and verified with each other. It is found that results obtained from both calculations are approximately same with a minor difference. The geometry and flow parameter of the condenser is determined on the basis of surrounding temperature. The solar panel is used for power generation to reduce electricity consumption by the compressor, pump, and evaporator fan coil. This provides the hybrid solar assisted geothermal cooling system.

A model on dual string drilling: on the road to deep waters

As the offshore market is facing the deepwater production challenges, the Oil and Gas Industry is investing in new technologies to bring down costs needed to effectively exploit reservoirs. Therefore, dual string drilling (DSD) can eliminate the marine riser which would result in exploring oil fields in deep and ultra-deepwater economically. In order for controlling fluid contact with a borehole wall during drilling operations include introducing an outer pipe into a borehole and positioning an inner pipe within the outer pipe axially. The method may further include circulating a drilling fluid to a drill bit using inner pipe and the annulus between the inner pipe and outer pipe. The drilling fluid may be separated from the control fluid by using an annular isolator. The results showed that with DSD approach a lot of time will be saved in order to circulate the kick out of the well. Apart from riserless drilling, DSD has an efficient cutting removal capacity, better annular clearance, elimination of differential sticking, better well stability, better well control parameters, reduction of torque and drag, avoid the dynamic equivalent circulating density gradient, and better extended reach drilling. The novelty of the new dynamics model is in the ability to solve narrow operational margin between pore pressure and fracture pressure as we move into deeper waters.

Exploitation and Utilization of Oilfield Geothermal Resources in INDIA

There are plenty of geothermal resources available in existing oil and gas sedimentary basins in India. In recent time oil and gas companies have put their efforts for exploiting and utilizing geothermal resources using various advanced technologies. The paper describes the study of geothermal energy potential in oilfields in India. Considering the existing low and medium temperature geothermal resources, researchers have discussed the possibility of various direct and indirect applications of geothermal energy. The paper also describes the Organic Rankine Cycle (ORC) technique used to generate power from low enthalpy geothermal resources. From the above studies researchers have found that sustainable and economic development of existing oil and gas fields with efficient utilization of geothermal energy sources can reduce the dependency on fossil fuel. It can be done based on the existing infrastructure, technology experience and reservoir information.

Utilization of Geo-Solar Hybrid System for Efficient Power Production in India

Geothermal, Solar Energy combined can give a suitable working temperature for an Organic Rankine Cycle to be highly efficient. Solar energy is utilized to raise the temperature of the geothermal fluid (at 60–65 °C) up to 85 °C (minimum temperature for power generation through ORC). The paper focusses on major comparisons between combined Geothermal-solar energy source and conventional energy source. As CO2 issues continue to degrade the environment and fossil fuels become more expensive, interest in low grade heat recovery has grown in the past few years. Hybrid Solar and Geothermal energy, as a clean, renewable, pollution-free and sustainable energy has great potential for the use of ORC systems.