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    				| 1. | 
                                    Explain the principle of heat exchange | 
                            
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Answer»  This arrangement is what we mean by a heat exchanger: the gas jets cool down and thewaterheats up. A heat exchanger is a device that allows heat from a fluid (a liquid or a gas) to pass to a second fluid (another liquid or gas) without the two fluids having to mix together or come into direct contact  | 
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