Terms & Let’s assume we have a perfectly efficient, infinitely long heat exchanger with the same substance on each side, but one enters … View desktop site, A double-pipe parallel-flow heat exchanger is used to hear water (cp=4180 J/kg-K) from 25°C to 60°C at a rate of O 2 kg/s. Parallel and Counter Flow Designs Heat Exchangers - Although ordinary heat exchangers may be extremely different in design and construction and may be of the single- or two-phase type, their modes of operation and effectiveness are largely determined by the direction of the fluid flow within the exchanger. So let's take an absurdly simplified example. 60°C Brine Water 25°C The length of the tube required to achieve the desired heating is, mechanical engineering questions and answers. Heat exchangers are typically classified according to flow arrangement and type of construction. Counter & Parallel Flow Heat Exchanger Tube Length Calculation : Input data in YELLOW Update and Reset funtions at bottom of page. If water is kept above 32 deg F, freezing can be avoided. Heat is transferred from the warm fluid through the wall of the inner tube (the so-called heating surface) to the cold fluid. A double-pipe parallel-flow heat exchanger is used to hear water (cp=4180 J/kg-K) from 25°C to 60°C at a rate of O 2 kg/s. While parallel flow arrangement can be beneficial, under certain conditions that reduce the limiting temperature, channeling problems can occur or freeze may be caused at shutdown. The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions. Another advantage if parallel flow heat exchangers are used is that outlet temperature of the fluid being cooled can reach a limiting temperature. Parallel-flow and Counter-flow Heat Exchanger. This heat exchanger … If the overall heat transfer coefficient of the heat exchanger is 550 W/m2K, determine the length of the tube required to achieve the desired heating (Round the answer to a single decimal place.) Heat transfer, Q = U*A*∆Tm : Plane wall heat transfer coefficient, U … The heating Is accomplished by geothermal water (cp-4310 J/kg K) available at 133ºC at a mass flow rate of 0.3 kg/s. This heat exchanger consists of two concentric pipes of different diameters. | The heating Is accomplished by geothermal water (cp-4310 J/kg K) available at 133ºC at a mass flow … The inner tube is thin walled and has a diameter of 0.8 cm. Privacy Parallel-flow and Counter-flow Heat Exchanger. Effectiveness, NTU, Ratio of Heat Capacity, Derivation of Effectiveness for Parallel Flow Heat Exchanger If water is kept above 32 deg F, freezing can be avoided. While parallel flow … The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions. A heat exchanger can also be operated in counterflow, in which the two fluids flow in parallel but opposite directions. Another advantage if parallel flow heat exchangers are used is that outlet temperature of the fluid being cooled can reach a limiting temperature. Other articles where Parallel-flow heat exchanger is discussed: heat exchanger: This flow arrangement is called parallel flow. Heat exchangers are typically classified according to flow arrangement and type of construction. Parallel Flow. © 2003-2020 Chegg Inc. All rights reserved.