...Group Case Study Spartan Heat Exchangers Inc. Current State Spartan Heat Exchangers Inc. has been a leading designer and manufacturer of specialized industrial heat transfer equipment for more than 10 years. The company’s primary products are transformer coolers, hydro generator coolers, air-cooled heat exchangers and transformer oil coolers. Their USP are Fin tube type heat exchangers and long lasting products. “… A heat exchanger is a device that is used to transfer thermal energy (enthalpy) between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at different temperatures and in thermal contact. …” The company is into highly customized heat equipments. Presently, due to entry of new competition from European and Korean companies they have changed their corporate policy, which emphasize on reducing the variety and standardizing the product. The new business policy also aims at reducing the current lead time from 14 weeks to 6 weeks. Problem Statement The Materials Department headed by Rick Coyne has to take many initiatives internally to incorporate the various implications of the new strategy, and submit his report to his boss Max Brisco with the changes suggested by him within a week. The major challenges that Rick faces include: • Change from responsive to anticipatory model of production. • Increase inventory turns from present 4 times to 20 times. • Eliminate material shortages and stock outs. • Reduce...
Words: 2190 - Pages: 9
...SPARTAN HEAT EXCHANGERS INC. On June 10, Rick Coyne, materials manager at Spartan Heat Exchangers Inc. (Spartan), in Springfield, Missouri, received a call from Max Brisco, vice president of manufacturing: “What can materials department do to facilitate Spartan’s new business strategy? I’ll need your plan in next week.” SPARTAN HEAT EXCHANGERS Spartan was a leading designer and manufacturer of specialized industrial heat transfer equipment. Its customers operated in a number of industries such as steel, aluminium smelting, hydroelectricity generation, pulp and paper, refining, and petrochemical. The company’s primary products included transformer coolers, motor and generator coolers, air-cooled heat exchangers, and transformer oil coolers. Spartan’s combination of fin-tube and time-proven heat exchanger designs had gained wide recognition bot in North America and internationally. Sales revenues were $25 million and Spartan operated in a 125,000-square-foot plant. Spartan was owned by Krimmer Industries, a large privately held corporation with more than 10,000 employees worldwide, head-quartered in Denver. Rick Coyne summarized the business strategy of Spartan during the past ten years: “We were willing to do anything for every customer with respect to their heat transfer requirements. We were willing to do trial and error on the shop floor and provide a customer with his or her own unique heat transfer products.” He added, “Our design and manufacturing people derived greatest...
Words: 1117 - Pages: 5
...ESCUELA DE POSTGRADO DE LA UNIVERSIDAD PERUANA DE CIENCIAS CASO: Spartan Heat Exchangers Inc. PROGRAMA: MAESTRIA EN DIRECCION DE OPERACIONES Y LOGISTICA CURSO: GESTION DE COMPRAS Y ADQUISICIONES PROFESOR: MIGUEL SHINNO PARTICIPANTE: OSWALDO DANTE RAMIREZ ALVARADO 2011 LIMA-PERU Spartan Heat Exchangers Inc. DESARROLLO DEL CASO La nueva estrategia de Spartan´s era la siguiente “Reducir la variedad de tres o cuatro líneas básicas para cada categoría de producto. El departamento de ventas ya no aceptaría pedidos de diseños especializados. El objetivo de la nueva estrategia se he reducir el tiempo de entrega de 14 semanas a 6 semanas y menores costos de producción considerablemente” Spartan´s está actualmente con lo siguiente en inventario: Inventario Total | $53,500,000 | Inv. Materia prima | $21,400,000 | Inv. PP y PT | $32,100,000 | Esto se genera porque la cantidad de compradores que tiene, precisamente para mantener esta personalización del producto, que era parte de la estrategia anterior, generaba que esta gestión de compras estaba hecha de acuerdo al pedido (tal comprador para atender tal pedido), los materiales restantes se almacenaban y no volvían a ser tocados para otros pedidos, pues no hay una gestión de control de materiales en stock , el proceso de fabricación muestra una idea de producción que puede ser modularizada (procesos generales al inicio y procesos personalizados al final), las compras deben ser agrupados por tipo de material...
Words: 1106 - Pages: 5
...partan Heat Exchangers Inc. Group Case Study Spartan Heat Exchangers Inc. Current State Spartan Heat Exchangers Inc. has been a leading designer and manufacturer of specialized industrial heat transfer equipment for more than 10 years. The company’s primary products are transformer coolers, hydro generator coolers, air-cooled heat exchangers and transformer oil coolers. Their USP are Fin tube type heat exchangers and long lasting products. “… A heat exchanger is a device that is used to transfer thermal energy (enthalpy) between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at different temperatures and in thermal contact. …” The company is into highly customized heat equipments. Presently, due to entry of new competition from European and Korean companies they have changed their corporate policy, which emphasize on reducing the variety and standardizing the product. The new business policy also aims at reducing the current lead time from 14 weeks to 6 weeks. Problem Statement The Materials Department headed by Rick Coyne has to take many initiatives internally to incorporate the various implications of the new strategy, and submit his report to his boss Max Brisco with the changes suggested by him within a week. The major challenges that Rick faces include: • Change from responsive to anticipatory model of production. • Increase inventory turns from present 4 times to 20 times. • Eliminate material shortages...
Words: 312 - Pages: 2
...trODuct ION tO G rO u N D S O u rc e Heat P uMP SyS teM S chris arkins This note TEC 6, originally published in February 1999, was reviewed by Chris Arkins in January 2004. This summary page includes recent updates to the topic since publication. SUMMARY OF actIONS tOwarDS SuStaINable OutcOMeS Introduction Alternative low energy air conditioning solutions are now commonly sought in preference to typical air conditioning systems for both residential and commercial applications. The industry has seen a growing emergence of ground source heat pump (GSHP) installations throughout Australia over the last five years. A broad spectrum of facilities ranging from domestic housing, hospitals, education facilities, commercial offices and civic buildings to name a few, are now realising the environmental benefits offered by GSHP systems over more commonly used air conditioning systems. This summary note provides a brief overview of the previous note and provides an update on changes that have occurred since. basic Strategies Heat rejection is fundamental to all air conditioning systems. Typically, unsightly roof mounted air cooled condensers and cooling towers are by far the most commonly used method for rejecting heat from a building. Ground source heat pumps are somewhat different to the norm. Basically GSHP are refrigeration machines that provide heating and cooling by using ground water and the earth as a medium to reject and/or absorb heat and as such do not require air cooled...
Words: 3545 - Pages: 15
...the steam generator, with both consequences resulting in a loss of profit to the operating utility. Specific problems associated with steam generator materials that are discussed include denting, stress corrosion cracking (SCC), phosphate thinning, as well as vibration and mechanical problems. A connection is established between material issues that affect steam generators and capacity losses as well as decreased lifetime. Finally, solutions are discussed to prevent decreases in capacity and diminished lifetime. Introduction Steam generators are a critical component of PWR. The function of a steam generator in a PWR is to serve as a heat exchanger between the primary and secondary. The heat exchange that occurs between the primary and secondary creates steam, the steam turns a turbine, the process of which generates electricity. The generation of electricity for profit is the purpose of nuclear power plants, therefore material problems associated with steam generators that reduce the capacity of a nuclear power plant to generate electricity are an important profit consideration. Another significant cost and profit consideration is steam generator replacement cost and replacement power costs during the outage. The solving of steam generator tube-related material problems and the maximization of...
Words: 1771 - Pages: 8
...I have a 50 gallon hot-water tank that was purchased 120 days ago. It was heating fine then all of a sudden stopped heating. I had a Electrician come by and check. He check the heating coil and reset and both were working but still no hot water. I have a 50 gallon hot-water tank that was purchased 120 days ago. It was heating fine then all of a sudden stopped heating. I had a Electrician come by and check. He check the heating coil and reset and both were working but still no hot water. I have a 50 gallon hot-water tank that was purchased 120 days ago. It was heating fine then all of a sudden stopped heating. I had a Electrician come by and check. He check the heating coil and reset and both were working but still no hot water. I have a 50 gallon hot-water tank that was purchased 120 days ago. It was heating fine then all of a sudden stopped heating. I had a Electrician come by and check. He check the heating coil and reset and both were working but still no hot water. I have a 50 gallon hot-water tank that was purchased 120 days ago. It was heating fine then all of a sudden stopped heating. I had a Electrician come by and check. He check the heating coil and reset and both were working but still no hot water. I have a 50 gallon hot-water tank that was purchased 120 days ago. It was heating fine then all of a sudden stopped heating. I had a Electrician come by and check. He check the heating coil and reset and both I have a 50 gallon hot-water tank that was purchased 120...
Words: 344 - Pages: 2
...ZECCHIN Dott. Ing. Michele DE CARLI Dott. Ing. Dietrich SCHMIDT Laureando: Alessio PULLIERO Anno accademico 2003-2004 To my parents …. ABSTRACT The main purpose of this thesis is to investigate different control strategies for the heating and cooling system of the ZUB (Centre for Sustainable Building), situated in Kassel, Germany. It is an experimental office building, with a very detailed monitoring system for studying low-energy and low-exergy building technologies. The conditioning system is a TABS (Thermally Activated Building System), with water pipes embedded in the centre of a structural concrete slab, thus resulting in a ceiling radiant system. The high thermal capacity of the slab offers great opportunities to store heat, to dampen temperature fluctuations or to shift the peak-load; but, on the other hand, it implies a slow response of the system, which requires an accurate regulation strategy to front the variability of several factors, and to achieve the desired indoor temperature. A TRNSYS model of an office room has been developed, thus allowing to implement several regulations in the software and to test their performance. The main conclusion, carried out from the simulations, is that the implementation of a Feed-forward controller gives appreciable advantages in the temperature control, achieving both a more precise control of thermal conditions and a reduction of the energy consumption. The parameters taken into account by the controller are more than...
Words: 22312 - Pages: 90
...Finned Radiator Assembly | Heat Exchanger Design Project | Thien Van TranChris LongfieldEric PacewiczOlivia Ching | | 4/3/2012 | | Scope of the Project The objective of the project was to design an effective radiator assembly to accommodate the Diesel-Engine Generator Set 1500-XC6DT2 by incorporating the use of tubes with inner fins in various geometries in order to meet the heat rejection requirements specified. This was done with consideration for minimizing cost, size, and complexity. Initial Parameters The initial parameters were the operating requirements of the Diesel-Engine Generator Set 1500-XC6DT2 are as follows: * Coolant capacity – The coolant chosen for our radiator is ethylene glycol (50/50 % by volume) * Its maximum operating temperature of 225F * Air flow rate – Since the generator is stationary as opposed to that used in an automobile application, a fan will be needed to provide the necessary flow rate. The required air flow rate specified by the engine is 9.383 m3/s in order to dissipate the heat generated * Coolant flow rate – The coolant flow rate is 17.914 kg/s through the radiator * The initial coolant temperature is assumed to be 212F, which is slightly below the operating temperature of the engine. The initial coolant temperature is taken as the ethylene glycol entering the radiator immediately after leaving the engine. * Pressure drop allowance – The * The total heat rejected to the coolant is 666kW ...
Words: 1400 - Pages: 6
... | | |C. | | |Natural Gas | | | | | |D. | | |Coal | | | | Correct! [pic] Natural Gas supplies 53% of the fuel used to heat homes during the winter. Natural gas is typically cheaper than other fuels, required no storage, and fairly clean (no ash produced). |[pic]|Points Earned:...
Words: 3715 - Pages: 15
...Voss PCT 105 Equipment April 5, 2012 Heat Exchangers There are many types of heat exchangers used in a wide variety of industrial applications including power plants, boilers for industrial steam, chemical plants, and many types of manufacturing facilities. Several different configurations are used to accomplish the function of transferring heat from one fluid to another without mixing the two fluids together. The two most common industrial heat exchangers, the shell and tube heat exchanger and the double pipe heat exchanger, along with information about spiral heat exchangers, flat plate heat exchangers, flat plate heat exchangers, fin-tube heat exchangers, and condensers. Calculations for heat exchanger design use heat transfer parameters such as convection heat transfer coefficients, overall heat transfer coefficients, and log mean temperature differences. These calculations are needed for shell and tube and double pipe heat exchangers, as well as other types. The flow pattern through a heat exchanger affects the required heat exchanger surface. A counter flow heat exchanger needs the lowest heat transfer surface area. It gives a higher value for log mean temperature difference than either a parallel flow heat exchanger or a cross flow heat exchanger. A heat exchanger can have several different flow patterns. Counter flow, parallel flow, and crosss flow are common heat exchanger types. A counter flow heat exchanger is the most efficient flow pattern of...
Words: 1476 - Pages: 6
...made up of methane, ethane, propane and nitrogen (Shukre,F and Wheeler,F 2004 pg 3). Firstly, the natural gas (fed stream) comes in from the top and goes through three mixed refrigerants cycles (red stream). The pre-cooling cycle (green stream) consists of a mixture of Methane and Propane which is compressed in C1 according to the below diagram. It then is liquefied (purple stream) in sea water cooler C1 and sub cooled (blue stream) in E1A (Forg,W, Bach,W, Stockmann,R… 1999 pg5). One part is then throttled to an intermediate pressure and used as refrigerant in E1A. The other part is further sub cooled in heat exchanger E1B, throttled to the suction pressure of compressor C1 and used as refrigerant in E1B(Forg,W, Bach,W, Stockmann,R… 1999 pg5). The liquefaction cycle is compressed in C2, cooled in sea water cooler CW2A/2B. It is then further cooled in heat exchanger E1A, E1B and E2 (Forg,W, Bach,W, Stockmann,R… 1999 pg5). It is then throttled...
Words: 1239 - Pages: 5
...Classification Of Heat Exchangers Introduction Heat: is energy in transit from one mass to another because of a temperature difference between the two. A form of energy associated with the motion of atoms or molecules and transferred from a body at a higher temperature to one at a lower temperature. Heat energy will move from a high energy state to that of a lower energy state. The process will continue until a state of equilibrium is reached. Equilibrium is the energy state where the material is at the same energy level as its surroundings. A heat exchanger is defined as device used to transfer thermal energy (enthalpy) between two or more fluids, between the solid surface and a fluid. The fluids can be single compounds or mixtures. The typical applications of heat exchangers include cooling or heating of fluid stream of concern, evaporation or condensation of multi-component or single fluid stream. They are also used in heat rejection or heat recovery from a system. The heat exchanger: Is a piece of equipment built for efficient heat transfer from one medium to another? The media may be separated by a solid wall, so that they never mix, or they may be in direct contact. Heat exchangers are found in most chemical or mechanical systems. They serve as the system's means of gaining or rejecting heat. Some of the more common applications are found in heating, ventilation and air conditioning (HVAC) systems, radiators on internal combustion engines, boilers, condensers,...
Words: 828 - Pages: 4
...Horizontal Shell and Tube Heat Exchanger Table of Contents: Nomenclature. Pg. 3 Introduction and Background Pg. 4 Experimental Methodology Equipment and Apparatus Pg. 6 Experimental Procedures Pg. 7 Results Pg. 8 Analysis and Discussion……………………………………………………………………..Pg. 11 Summary and Conclusions Pg. 12 References Pg. 13 Appendices Pg. 14 Nomenclature Symbol | Term | Units | A | Heat transfer surface area for the tubes | Inches2 (in2) | Cp | Heat Capacity | J/(mol*K) | F | Correction Factor | __ | | Heat | W | c | Cold Side Heat Duty | W | H | Hot Side Heat Duty | W | Shell Side | Hot Side | __ | T | Temperature | Celsius | ∆T | Change in Temperature | Celsius | Tube Side | Cold Side | __ | ∆Tlm | Log mean temperature difference | Kelvin (K) | U | Heat Transfer Coefficient | W/(K*in2) | V | Volume | L | ṁH | Hot water flow rate | L/min | ṁC | Cold water flow rate | L/min | 1.0 Introduction and Background A heat exchanger is a device designed to efficiently transfer thermal energy from one fluid to another fluid, which can be a liquid or a gas [1]. These fluids do not mix or come into direct contact with each other. Even though all heat exchangers do the same job of passing heat from fluid to fluid, there are various types that work in many different ways. The two most common types of heat exchangers are the shell-and-tube...
Words: 2748 - Pages: 11
...the secondary fluid to the heat exchanger may change with time. This means that in order to maintain a consistent secondary fluid outlet temperature, the heat supplied to the heat exchanger must also vary. This can be achieved by using a control valve on the inlet to the primary side of the heat exchanger, as shown in Figure 13.2.1. Fig. 13.2.1 Typical temperature control of a steam/water shell and tube heat exchanger A control valve is used to vary the flowrate and pressure of the steam so that the heat input to the heat exchanger can be controlled. Modulating the position of the control valve then controls the outlet temperature of the secondary fluid. A sensor on the secondary fluid outlet monitors its temperature, and provides a signal for the controller. The controller compares the actual temperature with the set temperature and, as a result, signals the actuator to adjust the position of the control valve. For a constant heating area and heat transfer coefficient, the rate at which heat is transferred from the steam to the secondary fluid for a particular heat exchanger is determined by the mean temperature difference between the two fluids. A larger difference in mean temperatures will create a large heat transfer rate and vice versa. On partially closing the control valve, the steam pressure and the temperature difference fall. Conversely, if the control valve is opened so that the steam mass flow and hence pressure in the heat exchanger rise, the mean temperature...
Words: 4745 - Pages: 19
