How can I design a BKU chiller heat exchanger?
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When you say you want to design a chiller, I assume you mean the process design not the mechanical design. \n\nThe amount of heat being transferred is a given based on the process requirements. \n\nSince this is a BKU the shell side temperature both in and out will be the temperature of the refrigerant "bath" therefore the LMTD calculation is pretty straight forward.\n\nThe inlet and outlet temperatures on the tube side are also process design requirement and fixed by the process. \n\nThe actual materials of construction have very little to do with the actual sizing of the exchanger. Knowing the overall heat transfer coefficient is more a factor of the boiling liquid on the shell side and any condensing on the tube side. Velocity through the tubes is also a main factor.\n\nThe actual calculations are a trial and error method, because of this there are many computer programs to do the calculation for you. To attempt to provide a set of useful sample calculations on this site is not possible. You have to assume a tube size, number of tubes, tube length, tube arrangement, tube spacing and an acceptable pressure on the tube side.
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This might help\nhttp://www.labxnews.com/labxnews185.htm\n\nor\n\nChiller Assembly &\n® Operating Instructions\nModel 75 Viscometer\nCHILLER ASSEMBLY\nThe two modes of operation for the Model 75 Viscometer are: (1) standard heat with tap water cool-down mode and (2)\nchilled sample mode.\nFor most efficient operation in the chilled sample mode, enter the desired temperature using the front panel keypad, the\nsample temperature will be indicated on the LCD readout.\nChiller operation:\nRefer to Fig. B.\nDisconnect the Drain Line from the “Drain” connection on the manifold, and replace with the chiller Liquid In line.\nConnect the Liquid Out line to the “Chiller” connection on the manifold. The “Water Inlet” connection on the remote test\nstation can remain connected as the internal solenoid valve will stop tap water from entering the unit.\nSet the chiller operating temperature 4?C to 8?C colder than the desired sample temperature (this will speed-up the cooling\nprocess). When the sample temperature is within this 4?C to 8?C range, change the chiller temperature setting to with-in\n2?C below the desired sample temperature.\nNOTE: The coldest temperature that can be set on the chiller is minus 12?C.\nThe chiller assembly can cool a 200 Centipoise silicone calibration fluid from room temperature to -7?C in less than 30\nminutes (with sample stirred at 40 RPM). When the sample is maintained at a temperature below freezing for any length of\ntime, an ice shell builds around the cell holder. This ice can be heated off or allowed to slowly melt off, but in either case a\nconsiderable amount of water will accumulate on the base plate.\nA mixture of 50% ethylene glycol (P/N F4173) and 50% distilled water (P/N 52717) can be used as the chiller coolant. This\nmixture should be replaced after three months of service.\nDuring operation of the chiller, the pressure gauge at the outlet should read in the 15 - 25 PSI range. A pressure reading\nbelow 15 PSI indicates: (A) a possible leak in the system, or (B) the bypass valve has been opened too much. A reading\nabove 30 PSI indicates: (A) the possibility of an obstruction, or (B) the bypass valve is closed too much.\nThe use of the cell insulator cap (P/N C6121) is required for sample temperature equilibrium, and prevents an ice shell from\nforming on the top cap. The cell insulator cap must be removed for heated operation as its upper limit is 120?C before\nmelting.\nStandard heated sample/tap water cool down operation:\nRefer to Fig. A\nConnect the Water Drain line to the “Drain” connection on the manifold. The Tap Water In line should be connected to\nthe “Water Inlet” on the manifold. The liquid out line from the chiller can be left connected to the “Chiller Inlet” on the\nremote test station during the heating operation, as the check valve will prevent contamination of chiller coolant.\nPart No. E10890001EA Rev. -\nCHILLER SPECIFICATIONS:\nPower Required………………8 amps at 115VAC, 60hz\nReservoir………………………0.5 gallon (2 liters)\nPumping rate………………….1.6 gallon per minute at 45-60 psig\nWeight………………………….80 pounds\nDimensions……………………13” X 21” X 19”
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Wow.  What a fine idea.  If you don't find any you might want to check into how it could be done.  Try googling "absorption refrigeration".  \nFound one.  See ref. below.
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<>You have to be more specific.  Are you talking about an electrical condenser, a refrigeration condenser, an air conditioning condenser, or some other kind?
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Think Ive got this, Use a static Cuff, Remove heat sink and clean the fan (tooth brush is good for Heat Sink Fins and cotton buds for the fan, remove Thermal paste (carefully) white spirit or lighter fuel liquid, apply new Thermal paste to the top of the CPU (a drop say 10-12mm across as it will spread when Heat Sink is replaced, and a drop half that size on the bottom of the Heat Sink rebuild the assembly (fan, heat sink) and all will be Cool.
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I would use a length of nichrome wire (see links below) stretched between a couple copper blocks. You could make some sort of pinch block out of the copper and connect a power supply to the copper. (or drill a hole through it with a set screw, tap a hole and us a pan head screw)  You will have to insulate the copper from the rest of the world so you don't short something out.  G-10 (a glass/epoxy resin) makes a good moderately high temperature insulator.  One of the contacts should be fixed and the other allowed to "float" and allow for changes in the length of the wire due to heating.  A spring could be used to provide tension or an air cylinder.  The power supply will depend on the length and diameter wire you choose.  If there is a problem with the electrical contacts heating up, you could run some cooling water through them.  Just drill a hole through it and 1/8 NPT pipe tape both ends.  You can plumb some water to it and it will keep the copper chilled.
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What is this condenser's service? Refrigerant, steam, other? Do you need any sub-cooling.\n\nMaterials for the tubes or fins have very little to do with the over all heat transfer rate. Air flow rate and velocity inside the tube have a bigger impact. \n\nIf you do not need any sub-cooling, then having a configuration that will get the condensed liquid out of the condenser so more surface is exposed to the condensing process is important.\n\nOne important thing that is overlooked many times is air recirculation. Having a forced draft arrangement where the fans push the air across the condenser seems at first to be the most economical arrangement but in fact an induced draft arrangement where the air is pulled across the tubes and then discharged by the fans minimizes an air recirculation and actually results in better performance. You should note that most air conditioning condensers use this principle.
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Please see the following dry ice website.\n\nPS - I am a licensed Professional Engineer.  I reviewed the following website and found the information quite adequate.  If you need additional information you just may need to do some work.
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Cut a hole and mount a small enclosure cooler (alcohol vapor)\n\nIf cutting a hole is not an option then fabricate a heat sink and have the cooler blow on the heat sink.\n\nuse a simple house type thermostat for temperature control.
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I assume you are talking about a central chiller plant setup. This is common on large campuses. There are a few high capacity centrifical or recepricating compressor water chillers that chill water and it is stored in large tanks to expand system capacity or ofset high peak deman energy costs. The chilled water is sent to buildings and used to cool them in a device not unlike a car radatior.
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hi there,\nits like, you need to know the temp and the mass flow rate of the bottom product of the distillation column. also you need to know the boiling point of the bottom product. the mass flow rate depends on your design calculation. temp of the bottom product you should already know. and boiling point of the bottom product is readily availble.\n\nnow use m.cp.dt to find heat required to raise the temp of the product to its boiling point. where cp is the specific heat capacity of the bottom product and is available in handbooks or sometimes expressed as functions of temperature itself. and dt stands for differnce of boiling point of bottom product and the current temp of the bottom product.call this value as h1 (say).\n\nnow you know the latent heat of vapourisation of the bottom product again refer to data handbooks for the values. multiply this by the mass flow rate. and this is the heat required to vapourise the bottoms. lets call this h2 (say)\n\nnow h1+h2, gives you the heat load for the reboiler. use this heat load to calculate the steam requirement etc...\nyou can mail me sanjaykumar_16@yahoo.com for any clarifications.
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Use specific heat capacities and latent heats of these materials along with your head to get water at 0C
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thermodynamics?  heat transfer?  physics?
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i don't know but here is link http://www.apiheattransfer.com/en/Products/HeatExchangers/PlateHeatExchanger/index.htm  or   http://www.google.com/search?as_q=PLATE+HEAT+EXCHANGER%3F+&num=100&hl=en&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_occt=any&as_dt=i&as_sitesearch=&as_rights=&safe=images
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Heat exchangers, natural heating/cooling, jet mixing
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Modern Refrigeration. \n\nSource(s):\n\nhttp://www.constructionbook.com/xq/asp/q...
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Put evaporator coils connected to an ammonia absorption-type refrigerator in the ice chest. Build a fire to run the refrigerator.