An innovative and integrated approach for using energy from the flooded coal mines for pre-warming of a gas engine in standby mode using GSHP

The effort to reduce energy consumption and carbon emission is driving companies to integrate multiple energy technologies to achieve the goal of reducing overall energy consumption, enhancing efficiency and decreasing operational cost. This paper outlines an innovative approach for integrating energy from flooded coal mines via a Ground Source Heat Pump (GSHP) to provide heating to buildings and at the same time to pre-warm a gas engine in standby mode. Once operational, the gas engine will produce significant waste heat that will replace the GSHP in heating the buildings. The results show that this energy integration technology provides much improved overall Coefficient of Performance and reduce carbon emission

Does nitrous oxide harm the dentist?

KI

The design and evaluation of an open loop ground source heat pump operating in an ochre-rich coal mine water environment

Mine water from the abandoned coal mines is considered a good source of low enthalpy energy resource as the temperature of the mine water remains stable throughout the year and is suitable to be used for heating and cooling applications when implemented in conjunction with Ground Source Heat Pump (GSHP). The GSHP is considered to be a low carbon technology and its application for space heating and cooling is being actively investigated and developed by companies and local councils around the world. The open loop GSHP installations, in comparison to closed loop systems, are suitable and economical for large scale heating and cooling demands. This is because there is no time delay for heat transfer when compared with closed loop systems and because they use large volumes of coal mine water at a relatively constant temperatures. A few installations both large and small scale open loop mine water heating and cooling systems have been recently constructed throughout the world. However, coal mine water is associated with relatively poor water quality in some cases, often characterised by high salinity and pyrite oxidation. Despite the fact that mine water temperatures are favourably inclined for an efficient GSHP operations, concerns have been raised over the possibility of damage to the equipment due to poor water quality caused by clogging of the heat exchangers due to pyrite oxidation (ochre) in particular. Not much information is available on the impact of ochre has on the performance of an open loop GSHP when it is operated using the coal mine water rich in pyrite. This paper presents a novel design and implementation of an open loop system of GSHP operating in an ochre rich mine water environment. The results show that open loop systems, when combined with suitable heat pump and the associated design configurations of heat exchangers and maintenance procedures, could provide an efficient and reliable heating system at a lower cost

Lie Algebras and the Stability of Nonlinear Systems

Lie algenras and the Cartan decomposition are used to study the stability of "pseudo-linear" systems of differential equations

On the Stability of Pseudo-Linear Systems

A stability method for nonlinear systems of the form x=A (x)x with the origin as the only equilibrium point has been obtained. Examples are given to demonstrate the method

Pseudo-Linear Systems, Lie Algebras and Stability

The stability of pseudo-linear systems is considered by using a diagonal dominance approach coupled with the theory of the semi-simple Lie algebras and the Cartan decomposition

Hypersonic Interplanetary Flight: Aero Gravity Assist

The use of aero-gravity assist during hypersonic interplanetary flights is highlighted. Specifically, the use of large versus small planet for gravity asssist maneuvers, aero-gravity assist trajectories, launch opportunities and planetary waverider performance are addressed