United Heat Transfer Private Liminted

Marine heat exchangers are the most common way to cool a boat's/ship engine, using the lake, river or Sea water in which the boat floats. Direct cooling of the cylinders and heads by sea-water is unsatisfactory because sea water will eventually ruin the cylinder block and heads. Since this water may be corrosive the engine may be cooled by a sealed mixture of distilled/Fresh water and antifreeze. Heat from the water-antifreeze mixture is then transferred to the Sea (or lake or river) water which flows into a heat exchanger. The water-antifreeze mixture runs through the heat exchanger dumping heat, but remaining separate from corrosive salts and chemicals found in the water the boat is floating in. If the Sea water eventually corrodes and ruins the heat exchanger it can be replaced at a fraction of the cost of replacing the engine.

UHT Hydraulic Oil Coolers are heat transfer fluids, lubricating, transformer, machine oil & quenching oils. They are high quality products incorporating the best materials and the latest technical features. The tube bundle (stack) is fully floating so that thermal stresses are minimized and it can be easily removed for cleaning. Fixed tube sheet Exchangers also be designed & manufactured by determining of mean shell & Tube metal temperature, Shell & Tube side axial stress levels and flexible shell element requirements (Like bellow as per EJMA & TEMA )

An Air Cooled Heat Exchanger is a device for rejecting heat from a hot fluid directly to ambient air. Air Cooled Heat Exchangers are commonly used in industrial applications where a reliable source of water is not available as a cooling medium. Even if water is available, in some cases, air cooled heat exchangers are favored for lower Capital, operational and maintenance cost.

Water or moisture is not desirable in the transmission lines of an air compression system. Water carried through the lines washes away lubricating oil from the tools the compressed air is running. This causes the tools to operate sluggishly & increases the need for maintenance. The effect is compounded in high speed tools, where wearing surfaces are limited in size & excessive wear reduces efficiency by creating air leakage.

Further problem results from the decrease of temperature caused by sudden expansion of air at the end. This low temperature creates condensation, which freezes around port and valves & impairs efficiency. These conditions can be minimized by removing the moisture from the air directly after compression, before the air enters the distribution system.

The compressed air discharged from compressor is hot. Compressed air at these temperatures contains large quantities of water in vapor form. As the compressed air cools this water vapor condenses into a liquid form. As an example if an after cooler is not used, a 200 scfm compressor operating at 100 psig introduces 45 gallons of water into the compressed air system each day.

Most industrial compressors operating today are a multistage design. To optimize the cost of compressing gases it is popular to use multi-stage industrial compressor. When the Air compressor compresses air, heat is generated this causes the air to expand requiring an increase of horsepower for further air compression. If we remove the heat generated by compressing air, the total horsepower required for addition air compression is reduced up to 15%. For a multi stage compressor is to cool the gas between compression stages. Thus the role of the compressor intercooler is to provide colder, dryer, denser air to the next stage of compression. In addition to inter stage coolers, the compressor's final discharge is usually routed through an after cooler, which also provides colder and dryer gas to the end use point.