what is the difference between double pipe and shell and tube heat exchanger?
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Double pipe heat exchanger consists of two concentric pipes of different diameters. One pipe is for hot fluid and another is for cold fluid. ... Shell and tube heat exchanger consists of a shell in which large number of parallel tubes are present. One fluid hot or cold flow in shell and other hot or cold flow in the tubes.
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The main difference between direct and indirect heat transfer systems is the expenditure of air required to achieve heat transfer. Chilling, heating, processing and cleaning air results in high energy consumptions in direct heating processes.
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A single stage-compressor only lets the heat pump cool/heat at full blast. A two-stage compressor allows the heat pump to cool or heat at different levels: High (full blast) and low for milder days. ... Well two-stage heat pumps run more often, while using less energy.
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['Flat plate collector.', 'Evacuated tube collector.', 'Heat pump systems.']
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Heat Exchanger (HX) One boiler that heats water for brewing espresso and hot water/steam – and do allow you to use both functions simultaneously. ... Additional cold water has been pulled into the pipe so that its temperature is cooler than the main section of the boiler.
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In an indirect cylinder, the water is heated by the boiler. In a direct cylinder, the water is heated by electric elements known as immersion heaters.
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A 'direct' cylinder is heated via an electric immersion and does not work with a gas or oil boiler. An 'indirect' cylinder has coil running through the tank. ... The heated coil imparts its heat onto the fresh (potable) water in the tank that is used for washing or showering.
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There are two common types of plastic piping which are known as PB (Polybutylene) and PEX (Cross-linked Polyethylene). The main difference between PB and PEX is in how the material is created. ... So if you will be pumping water, or the pipes will be exposed to the cold, PEX is a better option than PB.
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A condenser is a device which converts vapour into the liquid state whereas a heat exchanger is a device which is used for heat recovery also to transfer heat from two fluids. Heat exchanger only heat is transferred without phase change and heat is transferred along with the phase change in the condenser.
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A unvented system has a pressure/expansion vessel, which is a vessel with a diaphragm, as above the diaphragm allows for expansion. A system boiler unlike a combi has stored hot water - for larger properties - or where a few taps could be used at a time therefore a combi flow rate wouldn't suffice.
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The difference between radiator and condenser. The radiator is specially designed for the heat dissipation of the car engine. The hot water flowing inside is the circulating water coming out of the car engine. The condenser is designed for use in the summer cooling of automotive air conditioners.
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This is best demonstrated by the fact that in turbulent flow, the flow rate is proportional to the square root of the pressure gradient, whereas in laminar flow, flow rate is directly proportional to the pressure gradient. This means that to double the flow, the pressure across the tube must be quadrupled.
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The wires are usually insulated with a rubberized cloth fabric. One of the main differences between modern wiring and the old knob and tube, is that there is no ground wire. ... Another difference is the wire insulation. Modern wiring is insulated with plastic, while knob-and-tube uses rubber.
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The advantage of the foam cell design compared to a conventional gas shock, either twin or monotube, is better heat dissipation. ... The big-bore design also means a lot of outer surface area as well plenty of oil for a heat sink, and both features are ideal for heat dissipation.
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In cooling systems the distribution can be either direct or indirect. If direct, the cooling water goes directly into the internal piping system of a building. In an indirect system, a heat exchanger separates the internal from the external system.
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The biggest difference will be the anode rod. Cheaper usually will have a single rod probably aluminum, mid range usually a larger/longer rod and might be Magnesium, and the higher cost ones are dual rod and usually Magnesium.
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Automotive water pumps are a centrifugal design, not positive displacement, so with a double pass radiator, the pressure is doubled and flow is reduced by approximately 33%. Modern radiator designs, using wide/thin cross sections tubes, seldom benefit from multiple pass configurations.