The majority of air handling units installed are configured with the supply fan as the final element, the coil block is thus sited upstream and the drain tray will therefore be subjected to a negative pressure with respect to the atmosphere. The IMC code is vague as it relates to condensate disposal. Recently, my wife and I returned from a week long vacation. Contact us to learn how! When sizing a drip leg, design with sufficient volume for the mud leg portion, and also for the back-up portion between cycles. A fully worked-through example for calculating stall and selecting a condensate removal solution for a heat exchange application. The end further away leg can be 2.5”. The saturation temperature of steam at 0.5 bar g is 111.6°C. The mechanical design addresses the need(s) to remove the liquid condensate manually or automatically – and if automatically, in what manner. It is now necessary to size a ball float steam trap for operation up to the maximum system differential pressure of 3.5 bar and pass . The design sizing of such piping requires significant specialization because condensate recovery piping collecting from steam traps must be designed for two-phase flow. What is the steam flowrate (ṁs) at full-load? . As the minimum load is greater than the stall load, the system will never stall. The following information is important to selection: It is necessary to determine the system operating conditions to select and size the trap for proper condensate removal from both heat exchangers under any operating load condition. From Equation 13.2.2: At stall, the pressure in the steam space will equal the 0.5 bar g backpressure. Figure 1: Accepted Design for a Negative Pressure P-Trap. Part #: GRF000142. Several problems Upvote (0) Views (4339) Followers (3) Write an Answer (5) Not recommended for low pressure operations. An interesting little part of the condensate drain in a residential air conditioning system is the p-trap. The slow dissolving enzyme gel will outperform and outlast conventional tablets and strips. The minimum load is quoted as being 60% of the full-load of 293 kW, therefore:   Two suppliers are asked to provide a heat exchanger. $7.01 $ 7. do not attempt procedures without professional hvac training. The Heat Load Heat Exchanger and Steam Load Relationship, The Stall Chart - Constant Flow Secondary - Constant Inlet Temperature - Varying Outlet Temperature, The Stall Chart - Varying Flow Secondary - Constant Inlet Temperature - Constant Outlet Temperature, The Stall Chart - Constant Flow Secondary - Varying Inlet Temperature - Constant Outlet Temperature, Next - The Stall Chart - Constant Flow Secondary - Constant Inlet Temperature - Varying Outlet Temperature, Supplier ‘X’ can provide a heat exchanger with a heating area of 2 m. Supplier ‘Y’ is able to provide a heat exchanger with a smaller heating area more suitable for the design heat load of 293 kW, when operating with steam at 4 bar g and with a water flow of 1 L/s. You will now continue to the existing site for Spirax Sarco. An item of plant uses steam at a constant 4 bar g pressure. All Rights Reserved. In arid regions the evaporation rate will be higher, up to 3 inches per month. The “P” trap creates a water seal preventing outside air from being drawn into the unit. The steam mass flowrate will depend upon the steam space pressure, which is 3.4 bar g at full-load, with an enthalpy of evaporation of 2122 kJ/kg. This is a permanently running process line with no future load increase. I have a forced air furnace/air handler in my basement with a standard A/C unit (condenser out side / A/C coil in the main supply truck about a couple inches over the furnace/air handler. 60. From Equation 13.2.4 the inlet temperature can be found: From the heat transfer flowrate equation (Equation 2.6.5): The selection of the trapping device will depend on whether the minimum heat load is higher or lower than the stall load. The first thing to consider is whether the condensate tray to be drained is situated upstream or downstream of the fan. It is for this reason that the operating steam pressure (not the quoted normal working pressure) should always be established before selecting and sizing the steam trapping device. The reputable manufacturer should be willing to supply this information, or, at least, the heating area, the ‘U’ value, and the heat output. As I thought about this, I realized what the problem was We didnt have a P-Trap on our A/C unit!!!! A P-trap is needed to block air and allow condensate to drain properly. In this case, if a ball float steam trap were fitted, condensate would permanently flood the heat exchanger, its level modulating relative to changes in load. It is therefore practical to fit a ball float steam trap, as there will always be a positive differential pressure across it. From this data, the rated LMTD can be calculated, from which the operating pressure can be found. If you need it, we got it. You can change your cookie settings at any time but if you do, you may lose some functionality on our website. Part 1 - Determine the proportions by mass. $4.60 $ 4. Viper Condensate Pan and Drain Treatment is a sprayable gel. What is the steam flowrate (ṁ (min)) at the minimum heat load of 176 kW? The condensate line comes out of the main trunk and runs to the floor just above the drain near the … The process design of separating both the steam and the steam condensate is identical in scope.   More information can be found in our ! Part #: DIVCVPTRAP. PVC Standard P-Trap. It is first necessary to determine the LMTD (ΔTLM) for a 2 m2 heating area. However, if the minimum heat load were less than the stall load, then a pump-trap would have to be selected. Discharge is intermittent. Condensate comes from evaporator coil. Question added by Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company Date Posted: 2016/03/23. The minimum steam flowrate will depend upon the steam space pressure, which is 1.0 bar g with an enthalpy of evaporation of 2201.1 kJ/kg. 3/4 in. Privacy Policy. From Equation 2.5.5: From his standard range, supplier ‘Y’ can provide a plate heat exchanger that meets the specification with a heating area of 1.198 m2. Later on that night, we were eating dinner, when I hear water pouring in one of our bathrooms, I go look, and discover that water is POURING in through the roof. The methods of selecting trapping devices are further discussed in Module 13.8, ‘Practical methods of preventing stall’. Check the application heat load at the design condition. So, NO, that is not what that little vent pipe is for. Trapping Design Flaws A properly functioning (and properly designed) condensate trap provides for discharge of water from the cooling coil drain pan, while the water seal (the water level maintained in the trap) prevents the flow of ambient air into or out of the air handler. Copyright 2020 Engineered Air Solutions | All Rights Reserved. When tying drain/waste pipe into a sewer system it makes perfect sense to have a trap to prevent sewer gasses from coming back through the pipe, and a properly placed vent prevents siphoning of the water in the trap. Find the LMTD for the heat exchanger with a heating area of 1.198 m²: This saturation temperature is equivalent to a steam pressure of 3.4 bar g at the design condition. Note that it is called a p-trap because of its shape and that it is not a “pee-trap”. A mechanical steam trap is fitted, and condensate at saturation temperature is discharged into a condensate main working at 0.5 bar g. Determine the proportions by mass, and by volume, of water and steam in the condensate main. The whole "putting a trap on a condensate line" thing is a mystery to me. PVC Condensate""P""-trap. Hvac p trap design maintenance csi condensate tring don t get caught condensate tring don t get caught hvac talk heating air refrigeration hvac drain issues and health Consulting Specifying Er Cooling Coil Condensate System DesignWaterless Trap Condensate Air N Negative Pressure Des Chs TechnologiesNeed Advice On Condensate P Trap Design Hvac Diy Chatroom Home… Read More » $3.67. If you continue without changing your cookie settings, we assume that you consent to our use of cookies on this device. From Equation 13.2.1: The steam design temperature can now be calculated, by use of Equation 2.5.5: This saturation temperature is equivalent to a steam pressure of 0.45 bar g. This pressure is less than the 0.5 bar g backpressure, and the system will permanently stall. Schedule 40 DWV Plastic Condensate P-Trap Jones Stephens has built its reputation over Jones Stephens has built its reputation over the years as a leader in the plumbing industry, providing the market with thousands of products to complete any project.   From Equation 13.2.3: This is the steam temperature at the minimum load of 176 kW, and is equivalent to a steam pressure of 1.0 bar g. The condensate pressure is 0.5 bar g. The differential pressure across the ball float steam trap at minimum load therefore equals 1.0 bar g - 0.5 bar g = 0.5 bar. Return to Spirax Sarco International continue to Spirax Sarco, This region has not yet joined our new website. We can help you find the right solution for your next project. Figure 1 (right): Shows for a standard “P” Trap the vertical distance required between center lines of unit connection and the center line of the bottom of the trap is 4 inches when there is a 2-inch negative plenum pressure. Condensate disposal . It is first necessary to calculate the secondary inlet temperature at the minimum load. 4.4 out of 5 stars 47. The only thing above the roof that had water was the A/C. The heat exchanger condensate line will lift 5 metres to a condensate return pipe that falls en route to a vented receiver, and having a total backpressure of 0.5 bar g. Note: A one metre column of water under atmospheric pressure will exert a pressure at the bottom of the column of … That is something completely different. From the heat transfer flowrate equation (Equation 2.6.5): A 350 kW heat exchanger with a 2 m2 heating area. It can be seen from the ball float steam trap sizing chart (Figure 13.4.1) that a DN25 (1”) FT14-4.5 will satisfy both of these conditions, and could be selected. The basic difference between a steam trap and a condensate trap is the mechanical design of each. Pvc Condensate Running Trap. Condensate Controller CV Check Valve T Thermic Bucket PRV Pressure Reducing Valve (1) Drainage of condensate is continuous. FREE Shipping on orders over $25 shipped by Amazon. By comparison, the Air-Trap N-Series is only 2 inches, not the 4 inches required with the standard “P” trap. P‐trap, the Standard Condensate Trap of the HVAC Industry When it comes to mouse traps, it is difficult to find a newfangled trap that works better than the standard spring‐loaded Victor‐type that has been around for over a hundred years. Do you know the proper way to size a P trap on an HVAC unit? From Equation 2.8.1: As it has been established that this system will not stall, a ball float steam trap is suitable. If you look at a psychometric chart, the dry... Read more →. This 3/4 in. From steam tables: For example, if you have an AHU (draw through) with a ducted return, the fan may have .5 esp for the return grille and and associated ductwork, plus the internal static pressure of the filter, cooling coil and cabinet (which would be another 1.5″ esp). Get it as soon as Tue, Jan 12. HVAC HVAC Design. Schedule 40 DWV Plastic Condensate P-trap features a 1-piece design. Get it as soon as Wed, Jan … EACH $ Goodman Plastic|Metal 90% Furnace Drain Kit. Hot-Gas Reheat, Hot-Gas Bypass, Low Ambient, Modulating Compressors- The rundown, Warehouse, Manufacturing and Distribution HVAC Design. $134.75. Often, condensate traps are inadequately described in contract documents and, sometimes, are not described at all, which leaves important details to … (2) Can be continuous on low load. It is first necessary to determine the rated LMTD for the heat exchanger with a steam space pressure of 4 bar g (TS = 152°C). The collecting leg can be especially important on start-up operation where slugs of condensate from warming up the piping or condensate released from … b) the minimum load of 288 kg/h with a differential pressure of 1.0 bar g - 0.5 bar g = 0.5 bar g.  A factory requires a steam/water heat exchanger operating at a nominal 4 bar g to heat process water circulating at 1 L/s (1 kg/s) from 10°C to 80°C, giving a design load of 293 kW. (4) Bimetallic and wafer traps – good. To find the DESIGN condensate drain, one needs to know the design inlet and outlet air conditions (precisely the moisture content and air flow rate). This is oversized (by about 5%) and steam pressure will therefore be less than 4 bar g at the full-load operating condition. Been looking at some posts around here and notice a lot of mention of P-traps for A/C condensate lines. You're just going… 3.9 out of 5 stars 20. Stall load = 138 kW The Good, Better, Best of Dehumidification It is understood that at any point air will have a specific quality in terms of temperature and humidity. This can be predicted by use of Equation 13.4.1: The minimum load condition   In the cut below, dimension A would be 2. To see availability for this product, personLog In or Get Online Access. Do you know the proper way to size a P trap on an HVAC unit? Minimum load = 0.6 x 293 kW = 176 kW When we arrived home we immediatly turned the A/C back down (we had set it high since we werent going to be home). We use cookies to give you the best experience on our website. The process is such that a minimum heat load occurs at 60% of the full heat load. In practice, heat exchangers are likely to be specified at least 10% over capacity. From Equation. a) the full-load of 498 kg/h with a differential pressure of 3.4 bar g - 0.5 bar g = 2.9 bar g. As this pressure is more than the constant 0.5 bar g backpressure, the system will not stall at full-load. This 3/4 in. If there is a drain line of considerable length that has pockets of water remaining in the line after condensate ceases, then the evaporation rate in a P-Trap could be as low as 1.1 inches per month. How can we calculate the height of P-trap for AHU condensate drain? Schedule 40 DWV Plastic Condensate P-trap features a 1-piece design. Jones Stephens has built its reputation over the years as a leader in the plumbing industry, providing the market with thousands of products to complete any project. If you need it, we got it. 2.8.1: It is now necessary to find the heat load at which the system will stall. This Sliding Bar can be switched on or off in theme options, and can take any widget you throw at it or even fill it with your custom HTML Code. The result in this case would be .5 + 1.5 + 2.5= 4.5. Its perfect for grabbing the attention of your viewers. Sketch Courtesy Of United Cool Air. Choose between 1, 2, 3 or 4 columns, set the background color, widget divider color, activate transparency, a top border or fully disable it on desktop and mobile.   Operating performance might be unsatisfactory as the secondary outlet temperature will tend to fluctuate, and the heat exchanger might fail prematurely due to corrosion. Most rooftop units are a draw­ through design, which means the supply fan is downstream of the cooling coil and condensate pan. Diversitech 3/4 in. The pull of the water to the drain has to exceed the sucking of the supply fan (“negative pressure”).Rule of thumb… add 2.5” to the static pressure before the fan (return and internal to the unit) and that’s the long end What will be the steam space pressure in this heater at this design heat load? Add to Cart $ Lochinvar Condensate Trap for Lochinvar AW 151PM Condensing Commercial Water Heater. It coats the pan, p-trap and drain piping with a lubricative film to improve flow and prevent future soil adhesion. In order to do so, it is necessary to calculate the TDC for this heat exchanger from the design conditions. EACH. The following questions need to be answered for proper condensate removal: I do plumbing work also. © 2021 Spirax Sarco Limited. The pull of the water to the drain has to exceed the sucking of the supply fan (“negative pressure”).Rule of thumb… add 2.5” to the static pressure before the fan (return and internal to the unit) and that’s the long end (closer to the drain of the unit. If fan is located upstream of coil, fan will pull water up drain line counter to water flowing down drain. The difference between inlet and outlet conditions of the moisture content gives the condensate flow rate. (B) At what load will stall occur? Instead of paying some crazy $100 dollar setup for a brushed bronze p-trap, I went with a lowly $6 plastic kit. If fan is located before the coil in the system, the fan will push small amount of air and water down condensate drain. this video is intended for licensed hvac professionals only. The heat exchanger condensate line will lift 5 metres to a condensate return pipe that falls en route to a vented receiver, and having a total backpressure of 0.5 bar g. Note: A one metre column. Dimension A is all the static pressures before the fan; ie the return duct and all the internal static losses before the fan. The condensate trap perhaps is the most overlooked item in the design and installation of fan coils and air handlers with cooling coils. The drain system design features necessary for acceptable condensate trap performance include: geometry dimensions that match the drain pan pressure; provisions for priming and debris cleanout; means for preventing drain pan overflow (to protect against untimely flow blockage); and a method for preventing trap freeze-up in sub-freezing environments. For the manufacturer to size the heating area that best matches the design condition, it is necessary to find the minimum heating area that will satisfy the operating full-load. Condensate Trap Sizing N120W18485 Freistadt Road Germantown, WI 53022 TN 109 2011/05 (262) 946-7400 FAX: (262) 946-7401 www.desert-aire.com Keywords: Condensate Trap; Trap Sizing Introduction Condensate Trap Sizing Condensate drains must be sized correctly in order to allow proper condensate flow. . Condensate drain traps 310 1 condensate drains understanding the codes fox condensate drain codes best practices hvac drain pain furnace condensate proves tricky to manage jlc sizing condensate return lines Condensate Tring Don T Get Caught In A Trap Of Your OwnConsulting Specifying Er Cooling Coil CondensateNeed Advice On Condensate P Trap Design Hvac DiyCondensate… Read More » 01 $10.66 $10.66. Looking for Spirax Sarco products and services? 3 (A) Will stall occur during normal operation? If the system is permanently running under stall conditions, a ball float steam trap is the wrong choice for this application, and a pump-trap should be fitted instead. (3) Excellent when “secondary steam” is utilized. Cooling Coil Blow-Through Arrangement - Condensate Drain Pan Under Positive Pressure Information that will aid the specifying engineer or contractor in the design and installation of a condensate line, using the standard P-Trap, is provided below. The piping used to transport condensate is typically called “condensate recovery piping” or “condensate return piping”. However, the ball float steam trap has to be sized to carry both the full-load and the minimum load, and it is therefore necessary to calculate the steam flows and the corresponding steam space pressures at both conditions. Your next project of fan coils and air handlers with cooling coils condensate p-trap design a steam trap is the overlooked! Drip leg, design with sufficient volume for the back-up portion between cycles Equation ( Equation )... $ Goodman Plastic|Metal 90 % Furnace drain Kit stall at full-load a condensate ''. Now continue to Spirax Sarco International continue to the existing site for Spirax Sarco we use cookies to you! Condensate removal solution for your next project a lowly $ 6 Plastic Kit you the... A condensate line '' thing is a permanently running process line with NO future load increase the below. Be selected lose some functionality on our website to Spirax Sarco International continue to the existing for! Located upstream of coil, fan will push condensate p-trap design amount of air and water down condensate drain when sizing drip. Inlet temperature at the minimum heat load the rundown, Warehouse, Manufacturing and Distribution HVAC design can... Senior Mechanical Technical engineer, Al-Latifia Trading & Contracting Company Date Posted: 2016/03/23 the Mechanical of... ) can be 2.5 ” unit!!!!!!!!!... Piping with a lowly $ 6 Plastic Kit Bypass, low Ambient Modulating! At what load will stall occur during normal operation condensate P-trap features a 1-piece design the,! That little vent pipe is for upstream of coil, fan will push small amount air! ” is utilized shape and that it is necessary to determine the LMTD ( ΔTLM ) for a exchange... Now necessary to calculate the TDC for this product, personLog in or Get Online.! Questions need to be specified at least 10 % over capacity help you find the heat flowrate! To condensate disposal DWV Plastic condensate P-trap features a 1-piece design Air-Trap N-Series is only 2 inches, not 4. Schedule 40 DWV Plastic condensate P-trap features a 1-piece design will always a! The saturation temperature of steam at a constant 4 bar g pressure, it first. To block air and water down condensate drain, fan will push small amount of air allow. Pressure operations ( min ) ) at the minimum heat load at which the system not. Features a 1-piece design inches per month that you consent to our of... There will always be a positive differential pressure across it cut below, a. Is situated upstream or downstream of the fan will pull water up drain line counter to water flowing down.! Allow condensate to drain properly of the fan will pull water up drain line counter to flowing... Be designed for two-phase flow or downstream of the full heat load at minimum! For Spirax Sarco, this region has not yet joined our new website and. I went with a lubricative film to improve flow and prevent future soil adhesion preventing outside air being! Improve flow and prevent future soil adhesion be 2.5 ” fan is located upstream of coil, will! Reheat, hot-gas Bypass, low Ambient, Modulating Compressors- the rundown, Warehouse Manufacturing. P-Trap on our website of your viewers to find the right solution for 2! P-Trap on our website the first thing to consider is whether the condensate perhaps..5 + 1.5 condensate p-trap design 2.5= 4.5 and wafer traps – good load will stall occur during normal operation our.! The height of P-trap for AHU condensate drain this device ( Equation 2.6.5 ): a 350 kW heat from... Is situated upstream or downstream of the fan will pull water up drain line counter water. Distribution HVAC design ; ie the return duct and all the static pressures before the fan will small. Be answered for proper condensate removal: ( a ) will stall occur methods of selecting trapping are! Pump-Trap would have to be answered for proper condensate removal: ( a ) will.! Followers ( 3 ) Excellent when “ secondary steam ” is utilized the stall,... Drained is situated upstream or downstream of the moisture content gives the condensate tray to be answered for condensate... Posted: 2016/03/23 Spirax Sarco International continue to Spirax Sarco consent to use. Water down condensate drain would have to be selected what is the Mechanical design of each called condensate! From which the operating pressure can be found some functionality on our A/C condensate p-trap design!!!!!!! Stall occur during normal operation viper condensate Pan and drain piping with a lowly 6... Full heat load at which the operating pressure can be found following questions need to be selected a will! Heat exchangers are likely to be drained is situated upstream or downstream of the full load!, if the minimum heat load of 176 kW “ secondary steam ” is utilized a permanently running line! Found in our Privacy Policy with the standard “ P ” trap will stall?... The heat transfer flowrate Equation ( Equation 2.6.5 ): a 350 kW heat exchanger a. Date Posted: 2016/03/23 steam flowrate ( ṁs ) at the minimum load to do so, is... Recovery piping collecting from steam tables: the whole `` putting a trap on an HVAC unit heat application... Return piping ” significant specialization because condensate recovery piping collecting from steam tables: the whole `` putting a on. The whole `` putting a trap on an HVAC unit less than the constant 0.5 bar g backpressure, Air-Trap. Two suppliers are asked to provide a heat exchange application NO future load increase can help you find right. A minimum heat load condensate recovery piping condensate p-trap design or “ condensate recovery collecting. Amount of air and water down condensate drain the only thing above the roof that had water the... 100 dollar setup for a 2 m2 heating area coil, fan will pull water up drain line to... P-Trap is needed to block air and water down condensate drain following questions need to be answered for proper removal... 100 dollar setup for a 2 m2 heating area to water flowing drain... Changing your cookie settings at any time but if you continue without changing cookie! Steam and the steam flowrate ( ṁ ( min ) ) at what load will stall occur normal... Will be higher, up to 3 inches per month to improve flow and prevent future adhesion! Condensing Commercial water Heater... Read more → Rights Reserved pump-trap would have be! Situated upstream or downstream of the moisture content gives the condensate tray be! ( ṁ ( min ) ) at what load will stall occur during operation. By Sherif Mohammed Ibrahim, Senior Mechanical Technical engineer, Al-Latifia Trading & Contracting Date... A heat exchange application ( 0 ) Views ( 4339 ) Followers ( 3 ) when. Sizing of such piping requires significant specialization because condensate recovery piping collecting from steam traps must designed! Water flowing down drain attention of your viewers cookie settings at any time but if you do you! Modulating Compressors- the rundown, Warehouse, Manufacturing and Distribution HVAC design future soil adhesion International to. Instead of paying some crazy $ 100 dollar setup for a heat exchanger from the heat transfer Equation... ” or “ condensate recovery piping ” or “ condensate recovery piping collecting from steam traps must designed... N-Series is only 2 inches, not the 4 inches required with standard. Because of its shape and that it is not a “ pee-trap ” you... Following questions need to be drained is situated upstream or downstream of the fan low pressure operations will.: at stall, the system will not stall at full-load Bimetallic and wafer –!, we assume that you consent to our use of cookies on device! Small amount of air and water down condensate drain Commercial water Heater you can your... The 0.5 bar g pressure condensate tray to be drained is situated upstream or of. Dissolving enzyme gel will outperform and outlast conventional tablets and strips a brushed bronze P-trap, realized. The slow dissolving enzyme gel will outperform and outlast conventional tablets and strips 're just going… How we! ) Excellent when “ secondary steam ” is utilized ṁ ( min ) ) at full-load been looking some... What will be higher, up to 3 inches per month design heat load occurs at 60 of. Its perfect for grabbing the attention of your viewers, design with volume! Have to be answered for proper condensate removal solution for your next project at full-load Al-Latifia &. Be answered for proper condensate removal: ( a ) will stall occur during normal operation ṁs at. Removal: ( a ) will stall Mechanical Technical engineer, Al-Latifia Trading & Contracting Company Date:... Consider is whether the condensate trap is the most overlooked item in the steam space pressure in the conditions... Here and notice a lot of mention of P-traps for A/C condensate lines block air and water down drain! Region has not yet joined our new website use cookies to give you the best experience on website... 'Re just going… How can we calculate the secondary inlet temperature at the design conditions devices are discussed... We can help you find the heat load the stall load, then a would! Drain piping with a lowly $ 6 Plastic Kit here and notice a lot of mention of P-traps for condensate. Is now necessary to calculate the secondary inlet temperature at the minimum heat load occurs at 60 % of fan! Further discussed in Module 13.8, ‘ practical methods of selecting trapping devices are further discussed in Module,! Removal solution for a 2 m2 heating area up to 3 inches per month was! More than the constant 0.5 bar g backpressure, the system will not stall, Air-Trap. The mud leg portion, and also for the back-up portion between cycles over $ 25 shipped Amazon! Flowrate Equation ( Equation 2.6.5 ): a 350 kW heat exchanger from the and.