Because the fins and/or tubes of the radiator do not match exactly the same spacing and line up correctly with the AC coil, it is advised to design a space in between the AC coil and the radiator to let the air move in semi straight/deflected lines, but not eddy or build unorganised pressure to any extent behind the AC coil. Typically, the axial fans used in a unit cooler draw air through the coil exhausting chilled air out through its mounting guard. The shroud serves 2 purposes. 2 shows the boundary conditions of the model. Noe that it is mounted there is just enough clearance to get the belts between the fan and radiator (scraped a bit, but still goes on). 1 Answer. At 12 feet, I'd try anything between 5 and 8 feet. 5) Is a curved blade fan better than a straight blade fan? In order to ensure full coverage of the coil a minimum distance between the fan and the heat exchange coil is required. Given the diameter of the motor hub, the outer diameter of the fans used on the typical race radiators curve for optimal design is minimal. Distance to Rad and Shroud Overlap. 1.3.6. And does the above answer change if the fans blow air onto the rad instead of sucking air off the rad, or vice versa? The heat sink geom-etry is shown in Figure 1. For Possible Interferences Blade Tip Clearances – Blade Tips (Ends) Should Be ¾ “ (.19.05 mm) From The First Obstacle To The Sides. Instead of fan some air coolers are equipped with blower with multiple speed controls. I am going to be pulling 3 Sanyo Denki 1011s through a PA120.3 radiator (thickness approximately 2.5 in). As a general rule, the closer the hood is to the cooking surface, the more effective the suction and evacuation of foul air will be. Fan blade clearances are intended to allow for engine shift due to severe braking or engine torque, fan loading or unloading with on / off fan drives, open or closed shutters, etc. The optimum distance between radiator fan and radiator is 0.3 x fan diameter. To Rear of Fan – Minimum of 1” (25.40 mm) Clearance Between The Trailing Edge Of The Fan To The Closest Object. tos. 1/2" should be max distance from radiator for proper cooling if you don't have a shroud. Following types of fans have externally mounted inlet vanes and require additional If you restrict the fan intake area you are adding pressure losses that the fan must overcome. These fans do a better job of creating a low-pressure area behind the radiator than they do of pushing air through a radiator. The optimum spacing was found to be approximately 1.5 times the vibration amplitude. This is often not possible due to lack of space. 0 0. Get your answers by asking now. Relevance. It makes the fan pull air through the radiator and it contains the fan if it breaks. Discuss Radiator distance from floor / window cill in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net. In cooling mode, at least eight inches of clearance between the fan and the ceiling is required to allow optimum airflow into the fan blades. Joined Feb 5, 2003 Messages 5,256. 1984 4WD Short Step Side 305 4Bl Quadrajet, 700R4 Email Report Don M Contributor Posts: 152 Loc: Tampa, Fl. Check FEAD Pulleys, Crankshaft Damper, Crankshaft Pulley Etc. Re: Fan Clutch to Radiator Distance 07-20-06 04:46 AM - Post# 972018 In response to ss3964spd You're right Dan, There is no spacer used between the fan clutch and waterpump pulley.The spacer that I am referring to is the shroud type spacer between the radiator support and the radiator. Today, many jets are tested using numerical CFD techniques and models that consider multiple variables (Król and Król, 2018). If the fan is too far forward the fan will cause a cavitation of air in the shroud. The radiator is set back because I originally planned on using a GTO condenser as well. Fire dynamics simulator. ->You are running a single electric 16" fan. Then divide the span of the fan by 2 to find the radius or center location of the fan (26"). Most of the buyers do not really pay much attention to the air cooler types because they care only about tank size and efficiency. Like Dean said, the fan needs to be halfway in and halfwy out of the shroud regardless of the distance to the radiator. Download : Download full-size image; Fig. Answer: Sometimes a curved fan is better than a straight fan, but not always. When you try to squeeze in a pusher fan in front it gives you very little clearance (1/4-1/2") between the fan and radiator. Fin spacing is the distance between fins which are used on air coolers, dry coolers, evaporators and condensers. Reaction score 1. Don't forget air is a fluid. Prior to yesterday, I was running a WH staggered 4 core with a Duff pusher fan in front and the stock fan and shroud behind the radiator. With ambient temperatures down to -40 o C, … When using dual fans (DWDI or SWSI) and fan inlets face each other, minimum clearance between fans to be 24” or 1-1/2 wheel diameters. As shown in the figure, it is assumed that a shroud is present to confine air flow to the fin channels. Jul 28, 2016 #1 I am sizing up a radiator for a newly built room. The distance between the fan blade and fan ring should preferab ly not exceed 6 mm as shown in the figure. In this case that is 51" (25" plus 26"). The optimum distance between radiator fan and radiator is 0.3 x fan diameter. Ask Question + 100. I like lots of clearance and a fan shroud. During this process the fan draws the required air from outside into the unit through the cooling pads. Russel. 2. We were required to have a metal shroud on the dirt track cars. 130-150 mm is acceptable as a minimum distance. Join Yahoo Answers and get 100 points today. A. A fin spacing of 1.5-5.0 mm is used for dry air cooling. The generally recommended minimum distance between a axial fan intake and the back of a cooling coil for example is about 1.5 times the diameter of the fan. Figure 4 - Fan Discharge Elevated so Top of Unit Is Higher Than Top of Wall CORRECT Induced Draft Counterflow Unit Layout NOTE: Fan cowl extensions require external support, supplied by other for: Fan cowls over 48.75" from the fan deck for 8.5x units and smaller, and fan cowls 51.25" from the fan deck for 3Mx and larger units. I have 3 row stock radiator and mechanical clutch fan with large plastic fan shroud. Thread starter Matrices; Start date May 28, 2010; May 28, 2010 #1 M. Matrices Supreme [H]ardness. i notice that many folks using the PA120.3 does not use the shroud... is it because of the amount of space required for a shroud? I have the heavy duty RV cooling fan and fan clutch installed with a modern aluminum 4 tube core radiator.....Sean. The FDS … Therefore, the optimum solution is to have as little spacing as possible. My gut feeling is biased toward the inlet to try to knock down the temp early. Is this normal? If you sit 12 feet back, separate the front left and right speakers by about 6 feet. Caution This is Not Always The Fan Shroud. There is flex in the body mounts and motor mounts. The farther you go, the closer the distance between the numbers approaches the ratio that can never be reached: 1.618033988… to infinity, to 1. They found the array spacing, or distance between fans, could have a significant effect on the thermal performance of the array. Join. Seems a bit close. 130-150 mm is acceptable as a minimum distance. Now, the bay window is quite large so the space underneath it isn't much. New radiator was installed and I've again been driving the car for past 1 1/2 weeks...but while changing my engine oil yesterday at my brother's house, he pointed out the widened gap between the shroud for the electric fan and the radiator core. User Info. You can vary this formula quite a bit. As in, biased towards the inlet side or the outlet side. Trending … The pressure losses are static pressure, which is what the fan performance is rated on. Golden Ratio can be derived from an exponential progression known as the Fibonacci sequence or summation numbers: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89… etc. Caution Not Always The Radiator. I have just under 1/2" between the fan and radiator. What is the ideal distance between fan blade and radiator? This will leave 25" from each wall to the blades and 50" between the blades of each fan as shown above. Favorite Answer. SN Certified Technician. The fan blades are centered in the shroud like it shows in the assembly manual. The stock metal fans weren't designed for high rpm. At least 2 -3 ins. This is often not possible due to lack of space. USA Reg: 09-22-07. With a shroud, the fan can be as far away as you want as long as the shroud is sealed to the radiator. 2. The recommendation is that there should be at least 1/3 of the fan diameter distance as a minimum . Trending Questions. DWDI fans minimum 24” or one wheel diameter between the side walls and the fan inlets on both sides of the fan. My question is this: how many inches should I allow between the case and the radiator to allow the fans to perform … I am going to mount the radiator externally on top of my case, and realize I obviously need to allow for a gap to allow the fans to draw air through the radiator. As part of the LS swap, I am using a 2005 GTO radiator and fan setup. ->The fan does not cover the radiator surface (31x19). Distance between radiator and fan? Simulation 2.1. Decreasing the spacing between fins increases efficiency and it is an inexpensive solution. Status Not open for further replies. What should the distance be from fan to radiator on a 1966 Barracuda with 225 Slant Six, original 5-blade fan and 3-core v-8 radiator? The height, or the distance between the range and range hood, varies according to the type of cooktop, suction and exhaust capacity, and the type of unit. Start by separating your front left and right speakers by about half the distance that you sit from the speakers. Then, add the distance from the wall to the radius of the fan to locate the distance from the wall to position the fan mounting hardware on your ceiling. Sponsors. A pusher fan, in the context of a car's cooling system, is a fan mounted to the front of the radiator. Assume that the distance between the walls is defined by L and the distance of condensing unit from the supporting wall is defined by D. Fig. Don H. 1 decade ago. Apr 27, 2001 896 68 59 Cincinnati Ohio. 06-20-10 07:52 PM - Post# 1933478 In response to RunAndGun Sean, take a look at the distance between … Send Private Topic View Profile. Still have questions? is a certain distance too small to have any effect or certain distance too far? Cooling performance of fans placed in an array was also explored by Kimber and Garimella [19]. 1.3.5. Once the ventilation ducts are in place, the installation of the range hood is relatively simple. The velocity and temperature distributions were analyzed via FDS simulation. Answer Save. so how much distance between a fan and a radiator will be efficient? Re: Optimum distance between fan and radiator « Reply #27 on: July 28, 2010, 10:26:50 am » air doesn't "bend" going through the radiator core, it changes direction once through the core as it is drawn into the fan blade. The Zhong Liangshan tunnel of Metro Line 1 of Chongqing city, China was chosen as a case study of the optimal distance between jet fans. The distance between the fan blade and fan ring should preferab ly not exceed 6 mm as shown in the figure. does any distance, say 1/2" from the radiator help? However, I ended up ordering the Vintage Air surefit kit based on the price of new GTO parts. forced air cooling fan curve pressure drop maximum fin density baseplate backplane fin height thermal management improving performance This paper discusses the optimum fin spacing for a fan-cooled heat sink. Is there any point in placing distance between a fan and radiator if you have no shroud? Too far out of the shroud and the fan will pull air from around the shroud and not through the radiator. Mar 10, 2015 #2 The fan shroud kinda eliminates any need for getting the fan real close to the radiator. The fan blades should be 1/2 in, 1/2 out of the shroud opening. 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