double-pipe heat exchanger Articles

  • Enhancement of heat and exergy transfer inside double pipe heat exchanger with conical tube

    Enhancement of heat and exergy transfers in double pipe exchangers with conical tubes is investigated. Different fluid combinations are selected. The momentum and energy equations for both fluids are solved mathematically and numerically. Both solutions are well matched. A parametric study including the effect of the thermal conductivity, thermal capacity and the tube to pipe diameters ratios is ...


    By Inderscience Publishers

  • Thermo–economic analysis of heat pipe heat exchanger for waste heat recovery in thermal systems

    Thermo–economic analysis of Heat Pipe Heat Exchanger (HPHE) for waste heat recovery in thermal systems using the P1–P2 and NTU methods is presented. The optimum effectiveness of a HPHE is given as a polynomial equation, whereas the net savings and payback period are given in closed form to enable the HPHE designer to determine the optimised values directly. In addition to this, exergy analysis of ...


    By Inderscience Publishers

  • Electronic water treatment reduces fouling in heat exchangers

    The deposition of material on heat transfer surfaces is called fouling which significantly impacts on the thermal and mechanical performance of heat exchangers. Fouling increases the overall thermal resistance and lowers the overall heat transfer coefficient of heat exchangers as well as impeding fluid flow, accelerating corrosion and increasing pressure drop across the heat ...

  • Improving and maintaining the performance of your Heat Exchanger or Condenser.

    The usage of Heat Exchangers or Condensers is common in many processes across a wide range of industries. The Energy sector is no different, either in the Thermal Power Generation, Upstream and Downstream of the Oil and Gas including Petrochemical and Chemical plants; Heat Exchangers are used to cool of the steam or to pre-heat different liquid needed in the processes. The recurrent problem of ...

  • Monitoring leaks in Heat exchangers - Case study

    The Situation A California refinery produces xylene for use as commercial product and a precursor for petrochemical manufacturing. A primary component to the production of xylene is the isolation and purification of the chemical from a complex mixture of petroleum hydrocarbons. Steam based heat exchangers are used to process the xylene. Inherent to the design and rough duty heat ...

  • STOP IT Industrial - Heat Exchanger - Case Study

    InduMar Products, Inc. was contacted by a representative of a major chemicals manufacturer. It was reported that one of their facilities located in Asia had a problem... InduMar Products put together an action plan that would get their plant back up and running until a replacement heat exchanger channel head could be sourced. This plan called for utilizing multiple rolls of ...


    By InduMar Products, Inc.

  • Refrigerator condenser (shell and tube heat exchanger) cleaning case study

    In today's industrial environment of unceasingly consummates and improvement of equipment manufacturing technologies, heat-exchange and water circulation equipments become popular in the manufacture industry. The equipments can run efficiently at rated power if their systems have clean and unimpeded water channel. Once the water running equipments or systems were blocked by scale, it may cause ...


    By Mibo International Corp.

  • LIAOYANG PETROCHEMICAL COMPANY REDUCES SCALE IN HEAT EXCHANGERS WITH SCALEWATCHER

    Liaoyang Petroleum’s Olefin Factory in the Hongwei District of mainland China, producing MEG and polypropylene, is saving $65,000 a year in maintenance following the installation of the award winning Scalewatcher computerized, electronic water conditioner from Scalewatcher North America.  Since the Scalewatcher units were installed onto three heat exchangers in ...

  • Kenics Heat Exchanger Increased Production Capacity in Specialty Chemical Plant

    Increasing production capacity and setting a monthly production record are targeted goals for all manufacturers. To achieve this, all equipment and systems must work in perfect unison and perform to optimal efficiency. The Situation A large specialty chemical manufacturer located in Ohio was experiencing unsatisfactory production levels due to the plant’s old, outdated, ...


    By National Oilwell Varco

  • Heavy Machine Parts Cleaners: The Perfect Option to Maintain Heat Exchangers

    Heat exchangers are advanced equipment in industrial settings that help transfer heat from one medium to another efficiently. These days, heat exchangers find use in a wide array of industrial environments, such as petroleum refineries, space heating, sewage treatment, petrochemical plants, natural gas processing, air conditioning, refrigeration, and chemical plants. To guarantee proper ...


    By Daimer Industries Inc.

  • Optimum distribution of heat exchanger inventory and optimum thermal capacitance rate matching for power optimisation of a regenerated closed Brayton cycle

    The power output of the cycle is taken as objective for performance analysis and optimisation of an irreversible regenerated closed Brayton cycle coupled to variable-temperature heat reservoirs. The analytical formulae about the relations between power output and pressure ratio are derived with the heat resistance losses in three heat exchangers, the irreversible losses in the compressor and ...


    By Inderscience Publishers

  • The entropy matrix generated exergy model for a Photovoltaic heat exchanger under critical operating conditions

    The maximum entropy generation approach is adopted to develop the exergy model for a Photovoltaic (PV) heat exchanger with vertical heat exchange sections under critical operation of buoyancy-induced hybrid airflow. The Photovoltaic (PV) heat exchanger was constructed with two adjacent Photovoltaic (PV) modules with double-glass faces and back panel and assembled on a wooden duct and framing ...


    By Inderscience Publishers

  • Heat recovery from wastewater

    Heat recovery from gray water is particularly important in water-intensive industries such as pulp and paper plants, dairies and breweries. Rather than flushing used water down the drain, consider whether a heat exchanging system can help you put that energy to work in your process again. Most plant operators arc aware of the need to save money and reduce the environmental impact of their plant ...


    By DDI Heat Exchangers Inc.

  • Failing Brine Piping Replaced at World`s Largest Ion Exchange Membrane Plant

    Fabricated Plastics Limited is headquartered in Maple, Ontario, located on the northern outskirts of Toronto. One of North America's largest custom composite and dual laminate fabrication companies. Fabricated Plastics is dynamic, energetic, creative and resourceful. Engineering design, problem solving and fabrication are world class with the result that Fabricated Plastics is frequently invited ...


    By Fabricated Plastics Limited

  • Albuquerque restaurant exchanges water softener for green Scalewatcher water conditioner

    Zorba’s Fine Greek Restaurant in Albuquerque, New Mexico, has saved money on water, maintenance and salt by replacing its water softener with the computerized, electronic, water-conditioner Scalewatcher® from Scalewatcher North America.  Three months after installing Scalewatcher, the restaurant was able to remove its bulky water softener but still retain the ...

  • Modelling the viability of heat recovery from combined sewers

    Modelling of wastewater temperatures along a sewer pipe using energy balance equations and assuming steady-state conditions was achieved. Modelling error was calculated, by comparing the predicted temperature drop to measured ones in three combined sewers, and was found to have an overall root mean squared error of 0.37 K. Downstream measured wastewater temperature was plotted against modelled ...


    By IWA Publishing

  • Harbin daoli - District Heating, China case study

    In cooperation with ABB A/S Skovlunde and APV A/S Kolding DESMI A/S replaced large parts of the heating network in Harbin in China. Daoli is one of the seven districts of Harbin, the largest city in North East China with approx. 11 million inhabitants. It is known for its bitterly cold winters and is often called the “Ice City” – so therefore the city welcomed this ...


    By DESMI A/S

  • Valves in Water System of Heating Air Condition

    Common valves in water system of heating air condition include gate valve, globe valve and butterfly valve.   Gate vale For its moderate length, rotary adjusting rod and good regulating performance, gate valve is widely utilized in large caliber pipes.   Globe valve Globe valve is suitable for small caliber pipes for its long length, ...

  • Quebec recovers heat energy from sewage in Baied`Urfe

    Energy recovery from municipal sewage and greywater offers cities a new reliable resource.  Erwin Schwartz of DDI Heat Exchangers Inc. reports on a novel application of rectangular, wide-gap heat exchangers that has worldwide potential. The Canadian company DDI Heat Exchangers Inc. installed, with the support of the Quebec provincial government and municipal sewage authority, the first ...


    By DDI Heat Exchangers Inc.

  • Heat Pump Used to Drain Contaminated Sludge in a Steel Factory

    Summary In 1987, new regulations required that factories dispose of their contaminated water and waste themselves. Making galvanised steel wire, the Stelfil factory produces sludge contaminated with lead and zinc. Stelfil spent thousands of dollars to bury this waste and evaluated three systems to remove most of the water: a gas dryer, an induction heated screw conveyor and a heat pump system. ...


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