A gas turbine includes: a compressor configured to compress air; a combustor configured to combust fuel in the air compressed by the compressor so as to generate combustion gas; and a turbine configured to be driven using the combustion gas. Air coolers are configured to bleed the air from a plurality of places having different pressures in the compressor and cool the air bled from the respective places so as to generate cooling air. A waste heat recovery device is configured to recover waste heat from at least two of the air coolers.

A gas turbine includes: a compressor configured to compress air; a combustor configured to combust fuel in the air compressed by the compressor so as to generate combustion gas; and a turbine configured to be driven using the combustion gas. Air coolers are configured to bleed the air from a plurality of places having different pressures in the compressor and cool the air bled from the respective places so as to generate cooling air. A waste heat recovery device is configured to recover waste heat from at least two of the air coolers.

In a system and method of working tubes coupled to a tubesheet having a number of holes, wherein each hole in fluid communication with one of the tubes, an end-effector is positioned by a robot in coarse or rough alignment with a first hole in the tubesheet. Via lasers positioned on the end-effector, laser spots are formed on a surface of the tubesheet adjacent the first hole. The laser spots are detected by a camera and the alignment of the end-effector relative to the first hole in the tubesheet is refined via the robot based on the detected pattern of laser spots. The tool is then moved into the tube that is in fluid communication with the first hole in the tubesheet to work on (inspect, plug, sleeve or weld) the tube.

In a system and method of working tubes coupled to a tubesheet having a number of holes, wherein each hole in fluid communication with one of the tubes, an end-effector is positioned by a robot in coarse or rough alignment with a first hole in the tubesheet. Via lasers positioned on the end-effector, laser spots are formed on a surface of the tubesheet adjacent the first hole. The laser spots are detected by a camera and the alignment of the end-effector relative to the first hole in the tubesheet is refined via the robot based on the detected pattern of laser spots. The tool is then moved into the tube that is in fluid communication with the first hole in the tubesheet to work on (inspect, plug, sleeve or weld) the tube.

A thermodynamic system and method for performing work includes a working fluid and a fluid pump for pumping the working fluid through a cycle. A thermal input supplies heat to the working fluid. An expansion device downstream of the thermal input converts at least the heat of the working fluid to useful work. A heat exchanger downstream of the expansion device has a first portion to transfer heat from downstream said expansion device to a second portion at or upstream of said thermal input. A conversion device expands the working fluid with constant enthalpy from a higher to a lower pressure.

The invention provides a composition comprising 1,1-difluoroethene (R-1132a); a second component selected from the group consisting of hexafluoroethane (R-116), ethane (R-170) and mixtures thereof; and, optionally carbon dioxide (CO.sub.2, R-744).

The invention provides a composition comprising 1,1-difluoroethene (R-1132a); a second component selected from the group consisting of hexafluoroethane (R-116), ethane (R-170) and mixtures thereof; and, optionally carbon dioxide (CO.sub.2, R-744).

An engine cooling system, capable of reducing vehicle weight caused by employing a Rankine cycle and capable of improving Rankine cycle performance, including some inlet-side cooling water of a radiator is used as a heating source for a first evaporator and some outlet-side cooling water of a sub-radiator is used as a cooling source for a condenser, a coolant that has passed through an expander, a second evaporator, and a compressor in a cooling cycle for an air conditioner, vaporized, cooled and liquefied by passing through a side to be cooled of the condenser in the Rankine cycle.

An engine cooling system, capable of reducing vehicle weight caused by employing a Rankine cycle and capable of improving Rankine cycle performance, including some inlet-side cooling water of a radiator is used as a heating source for a first evaporator and some outlet-side cooling water of a sub-radiator is used as a cooling source for a condenser, a coolant that has passed through an expander, a second evaporator, and a compressor in a cooling cycle for an air conditioner, vaporized, cooled and liquefied by passing through a side to be cooled of the condenser in the Rankine cycle.

There is provided a drain recovery system with which power for driving a feedwater pump can be reduced and the feedwater pump can be driven at low costs. The drain recovery system includes: a buffer tank; an assist tank disposed below the buffer tank; a first drain supply line that connects a load device and the buffer tank; a second drain supply line that connects the buffer tank and the assist tank; a drain supply valve; a communication line that establishes communication between the assist tank and the buffer tank; a communication valve; a steam supply line that supplies steam from a boiler to the assist tank; a steam supply valve; a feedwater line that supplies drain from the assist tank to the boiler; and a feedwater pump.