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cooling coil performance curve

Latent heat is defined as heat, that when added to or removed from a substance, results in a change of state with no change in temperature of that substance. This will help me with the remaining curves as well. The effectiveness-number of transfer units (NTU) method is utilized to analyze the cooling coil performance under different flow conditions, which also helps to obtain the cooling coil chilled water temperature differential under full load and partial load conditions. Creative Commons Attribution Share Alike 3.0 License. Presenters: Trane engineers Brian Hafendorfer, Todd Michael, and John Murphy After viewing attendees will be able to: 1. First time here? 0000000776 00000 n It should be noted that the curve is normalized to the cooling capacity at Speed from the Reference Unit data, and have the value of 1.0 at the rating point. Introduction and Background The effects of ultraviolet light on microorganisms were discovered in the 1800s and several scientific studies on UV were published over a century ago. A greatly simplified schematic of enthalpy and temperature conditions in a counter flow cooling/dehumidifying coil is shown in the schematic Figure 162. CFM 1,000 1,000 2,000 Max. Coil performance is determined by the temperature difference between the water and air and so the lower the air on conditions the more difficult it becomes for a coil to meet a given load. Models MPX ERCH VER Airflow Range Min. The curve must be a linear, quadratic or cubic performance curve. The simple model provides a good prediction of the air and water outlet conditions without requiring the detailed geometric input required for the detailed model. $ÿ3ğ1 P”…�cC׆„†İ 2Á. Water Cooling Coils. The curve is normalized to have the value of 1.0 when the actual air flow … A detailed EnergyPlus model was developed for a prototypical big-box retail store. As a reference, here is the documentation for this curve: This alpha field defines the name of a bi-quadratic performance curve for Speed (ref: Performance Curves) that parameterizes the variation of the gross total cooling capacity as a function of the both the indoor wet-bulb and source side entering air temperature, from the Reference Unit. The linear regression for the biquadratic coefficients can be performed in Excel using LINEST. Coil data is based on 125° (51°C) temperature dif- ference between entering air and entering water. To obtain a fan curve the fan is placed in a test rig in which air pressure and volume can be measured and the pressure can be varied by adjusting a damper or venturi of known characteristics. Coil Performance –Load vs. Flow •Only conditions where entering water temp. × Finned Length In. I am trying to build performance curves for the speeds of a variable speed air conditioner. The input required to model the coil includes only a set of thermodynamic design inputs, which require no specifi… Fan curves are simply graphs showing fan performance, normally with air volume on the horizontal “x” axis, and pressure on the vertical “y” axis. 0000006431 00000 n Specialty Coils up to 40 tons Is there specific data I should request? 7660 Quincy St. Willowbrook,Illinois 60527 Buy Parts Online Drawing Package I do not yet have any performance data, but have made a request. Choked cooling coils • Improper water balancing Thus, to meet the maximum building load, the control valve responds by opening the valve to 100%, thereby allowing more chilled water to circulate. Check out the Help page! ___ Flow rate __ _ Maximum flow rates, performance curves and pressure drops are determined at the factory for optimum design efficiency. Direct expansion type evaporator coils are engineered and designed to deliver the maximum possible heat transfer effi ciency under all operating conditions. VE 2016 ApacheHVAC User Guide part B: Equipment, Loops, Components, and Controls 1 ApacheHVAC User Guide part B: Equipment, Loops, Components, and Controls 0000003201 00000 n restore cooling coil performance to original design values. comfort cooling, process refrigeration, and moisture control dehumidifying. Site design and logo: Copyright © 2015 Big Ladder Software LLC. Rated for 300psig. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 02 4 6 8 10 12 14 16 18 CFM x 100 Pressure 0 0.05 0.1 0.15 0.2 0.25 0.3 Brake Horse Power Typical Fan Performance Curve 591 . Availability: Optional on the MPX, ERCH, and VER models (up to 30 tons). Do you have expanded performance data at specific speeds? The end of Section 2.3 in the referenced NREL report above briefly describes the steps to normalize the data. This alpha field defines the name of a bi-quadratic performance curve for Speed (ref: Performance Curves) that parameterizes the variation of the gross total cooling capacity as a function of the both the indoor wet-bulb and source side entering air temperature, from the Reference Unit. I've developed many of the performance curves utilized by BEopt EnergyPlus for central, variable-speed air conditioners and mini-split heat pumps. However before I can help answer your question, I need to know what does the data look like for the unit you're trying to model. UV Cooling Coil Disinfection American Air & Water, Inc. * www.americanairandwater.com * 888-378-4892 4 2. Let us see what these processes are and how they are represented on the psychrometric chart. 0000003653 00000 n 318 0 obj <> endobj How are lighting schedules applied in EnergyPlus? <<7474CE3C7D03AF4AB1F478C599A7D3F2>]>> In this work, the characteristic curves of total cooling capacity, sensible cooling capacity and energy efficient rate of two room air conditioners were determined experimentally. 0000007492 00000 n 318 24 Air going through a typical cooling coil is not only sensibly cooled, latent cooling is also involved (although sensible cooling normally accounts for the majority of the cooling). o The dedicated DX Cooling model using performance curves and accounting for the entering air WBT at the DX evaporator coils provided as of VE 6.1.1 is thus far set up to run only with one DX evaporator coil per DX cooling source (compressor & condenser) and without any form of CHR to be passed to an ASHP. Steam pressure at coil hook-up point _____ _ Cooling media __ Inlet temp. DETERMINING SPECIFIC HEATING REQUIREMENTS FOR SERFILCO IMMERSION HEATERS TO DETERMINE THE HEATING … But when I look at the energy plus equipment summary output tables for DX cooling coils I see a ... you are entering rating condition operating point values that act together with the normalized performance curves of the dx machine only. Question-and-Answer Resource for the Building Energy Modeling Community, Building Performance Curves for Coil:Cooling:DX:VariableSpeed. Please start posting anonymously - your entry will be published after you log in or create a new account. You can also consult a report from several years ago that outlines the process for determining performance curve inputs using manufacturer data. The output of this curve is multiplied by the gross rated total cooling capacity at the speed to give the gross total cooling … You'll first need to convert the data to gross performance using fan data and then normalize it. output can be adjusted to meet cooling demands at part load conditions. 0000001829 00000 n Face velocity is restricted to 500 fpm (2.5 m/s) to avoid carryover of condensate from the coil. In the meantime, I am hoping to find practice data to learn the normilization process for these curves so I can be ready when I do get the performance data. 0000007206 00000 n link text. The system can achieve a lower supply-air dew point without lowering the coil temperature. Please note that the coil performance curve provided by ASHRAE should be considered more a theoretical representation or symbol, rather than an actual curve. load performance curves and there use with the EnergyPlus simulation tool to estimate the potential savings from the use of Rebel units compared to other standard options. Sensible cooling and sensible heating are basic psychrometric processes used for various applications. For each set of performance data entered, Capacity and EIR performance curves are generated, and these curves are generated either as a function of temperature(s) or flow fraction. performance of the traditional cooling coil. and leaving air temp. The output of this curve is multiplied by the rated total cooling capacity and the total cooling capacity modifier curve (function of temperature) to give the total cooling capacity at the … Request a Quote Download / View PDF. 0000003731 00000 n Specifically, for the Field: Speed Total Cooling Capacity Function of Temperature Curve Name, the documentation states that the curve must be normalized to the cooling capacity at Speed from the Reference Unit data, and have the value of 1.0 at the rating point. After giving Section 2 of that report a quick read, post additional questions. coil performance, a review of example selections for chilled-water and hot-water coils to demonstrate the tradeoffs of cost, pressure drop, and capacity, and an overview of various methods to prevent water coils from freezing during cold weather. AVAILABLE IN FOUR STANDARD FIN SPACING 70 FIN SERIES is designed and used for applications re-quiring high latent loads and for installations requiring low air pressure drop. The Capacity and EIR of Cooling DX Coils as a function of temperatures require only Biquadratic curve whereas Capacity and EIR of Heating DX Coils may use Biquadratic, Cubic and Quadratic curves. This represents the typical input conditions of 55° (13°C) entering air (EAT) and 180° (82°C) entering water (EWT). The data provided by the manufacturer will likely be net cooling performance. Hot Water or Standard Steam coils may be placed in the Preheat or Reheat position. 0000005371 00000 n The output of this curve is multiplied by the gross rated total cooling capacity at the speed to give the gross total cooling capacity at specific temperature operating conditions (i.e., at an indoor air wet-bulb temperature or outdoor entering air temperature different from the rating point temperature). All rights reserved. Jon. The crux is performing a linear regression on the data. × Finned Length In. 0000007944 00000 n 0000007447 00000 n The EnergyPlus documentation on the cooling coil inputs is pretty good. Fluid Coils up to 50 gpm For water and glycol systems, free cooling, heat recovery and other applications, EVAPCO Alcoil manufactures a high performance MicroChannel specifically for fluid to air featuring advanced water shedding as a cooling coil or high performance as a heating or cooling coil. trailer 0000001026 00000 n Select a one or two row coil for the desired GPM and MBH requirements from the graphs for the unit size and the CFM required. 0000001340 00000 n Coil options allow for 4 or 6 row cooling coils. The output of this curve is multiplied by the gross rated total cooling capacity and the total cooling capacity modifier curve (function of temperature) to give the gross total cooling capacity at the specific temperature and air flow conditions at which the coil is operating. xref performance of the cooling coils at conditions ranging from very low loads to design conditions. 0000002404 00000 n Coil features – All coil types accommodated: HW, CW, DX, steam, condenser, run-around etc – Coil selection and coil performance rating calculations – Psychrometric validations and cooling curve generation – Circuit diagram facility – SI and IP units of measure – Quotation generation – … Proper selection is the balance of both criteria. design means long life and top performance. CFM 10,000 10,000 10,000 Cooling Performance Cooling Capacity Range 5 - 30 tons 4 - 30 tons 4 - 30Air Conditions after Reheat Coil tons The selection of either of these … IMPORTANT COIL SELECTION PERFORMANCE FORMULAS . The input object Coil:Cooling:Wateris simpler than the detailed geometry model. 0000006975 00000 n IMPORTANT COIL SELECTION PERFORMANCE FORMULAS AREA and VELOCITY Coil Area (square feet) = Finned Height In. 341 0 obj <>stream 0000001482 00000 n Specified air on should be as close as possible to normal running conditions. Basic steady state heat and mass transfer differential equations or governing equations are used in steady state cooling coil models. Hope that helps some. Willies Carrier, the developer of air washers, surmised that an alternative design using direct contact between the air and chilled water might improve performance. Some cased/uncased coils are as clean as new with entrances and exits that mimic the conditions at which they were rated, with little to no "system effect" (non-uniform airflow into or out of the coil). Coil Area (square feet) = Finned Height In. You'll need data for a minimum of two speeds (minimum and maximum) from the manufacturer. AREA and VELOCITY . Performance data Is available by contacting SERFILCO. The air on humidity will also effect the total load to sensible load ratio. ÷ 144 . The latent (d ehumidification) capacity of the cooling coil increases with out increasing its total cooling capaci ty. 0 The ARI ratings are for the entire machine meaning dx coil + fan + other. Early system of air cooling consisted of a cooling coil arrangement in which supply air was cooled and dehumidified by indirect heat exchange with cold water pumped through tubing. 0000000016 00000 n See Figure 4 for full and half circuit coils with 4 tube face. QUALITY PRODUCT H and V belt drive blower coils are built from 18 gauge galvanized steel. 0000003430 00000 n xÚb```b``>ÎÀ 0000001217 00000 n of part-load performance curves and their use with the EnergyPlus simulation tool to estimate the potential savings from the use of WeatherExpert units compared to other standard options. The cooling coil performance can be simulated using either a steady state model or a dynamic model for different applications. A steady state model is sufficient to simulate the cooling coil thermal performance in most circumstances (Chow 1997). 0000008445 00000 n The wide variety of circuiting available offers the opportunity to provide the best circuit for peak coil performance. cooling coils). startxref three-way valve or bypass valve in chilled water loop. These curves have been integrated into a whole building energy program in order to evaluate the thermal comfort and the energy consumption of a conditioned space. You can estimate Standard Air Specific airflow. Coil Air Velocity = CFM of Air ÷ Coil Square feet = Feet Per Minute Velocity (FPM) Selection Note: As you raise the air velocity, a coil will increase in capacity but will have a higher air resistance. The CDQ wheel transfers water vapor, and the cooling coil does all the dehumidification work in the system. This reduces the chilled water flow rate in secondary water pumps. 0000003164 00000 n These are easily and accurately measured by pressure drop and the manufactures published data. 0000004827 00000 n The Quadratic or Cubic performance curve that parameterises the variation of total cooling capacity as a function of the ratio of actual air flow rate across the cooling coil to the rated air flow rate (i.e., fraction of full load flow). Does anyone have guidance on how to create this curve normalized to the cooling capacity at said speed? are within ±2°F of the coil design •Less run time, but still exceeds design conditions ARI Curve … Water coils have optional circuiting that can be used to reduce Water Pressure Drop, which may also allow for pipe size reductions and lower material cost. Understanding Fan Performance Curves. ÷ 144 Coil Air Velocity = CFM of Air ÷ Coil Square feet = Feet Per Minute Velocity (FPM) Selection Note: As you raise the air velocity, a coil will increase in capacity but will have a higher air resistance. 0000005915 00000 n %PDF-1.6 %âãÏÓ The value of 500 fpm (2.5 m/s) is very co mmonly used for coil sizi ng and it works very well for cfm/ton in the range of 500 to 600 (2.5 to 3 m3/s per ton). %%EOF 0000004279 00000 n To deliver the maximum possible heat transfer effi ciency under all operating.. Do you have expanded performance data cooling coil performance curve specific speeds entire machine meaning coil... Likely be net cooling performance and then normalize it guidance on how to this! Using manufacturer data can achieve a lower supply-air dew point without lowering coil! Conditioners and mini-split heat pumps and mass transfer differential equations or governing equations are used in steady state model a... Heating are basic psychrometric processes used for various applications … First time?. - your entry will be published after you log in or create a new account optimum. Is shown in the schematic Figure 162 sufficient to simulate the cooling coil models simplified schematic enthalpy., variable-speed air conditioners and mini-split heat pumps: Copyright © 2015 Big Ladder LLC... Valve in chilled water flow rate __ _ maximum flow rates, performance curves for coil cooling! Moisture control cooling coil performance curve anonymously - your entry will be published after you in... To deliver the maximum possible heat transfer effi ciency under all operating conditions ) capacity of the coil •Less... Data to gross performance using fan data and then normalize it transfer differential equations governing... In or create a new account + fan + other are built from 18 gauge galvanized.... Cooling and sensible heating are basic psychrometric processes used for various applications counter. Likely be net cooling performance simpler than the detailed geometry model as well normalized to the cooling coil performance Wateris. Cooling coil Disinfection American air & water, Inc. * www.americanairandwater.com * 888-378-4892 4 2 coil •Less... Ver models ( up to 30 tons ) of two speeds ( minimum and maximum ) from the coil cooling coil performance curve... Dehumidification work in the Preheat or Reheat position provided by the manufacturer data, but have made request. Are within ±2°F of the performance curves and pressure drops are determined the! Report above briefly describes the steps to normalize the data provided by the manufacturer will likely be net performance! Cooling coils, performance curves for coil: cooling: dx: VariableSpeed ( d ehumidification capacity! Speeds of a variable speed air conditioner data, but have made request. Models ( up to 30 tons ): Optional on the cooling coil Disinfection American &... Start posting anonymously - your entry will be published after you log in create! Data to gross performance using fan data and then normalize it ) temperature dif- between... Conditions in a counter flow cooling/dehumidifying coil is shown in the system can achieve lower... Inputs using manufacturer data see Figure 4 for full and half circuit coils with 4 tube face capacity at speed. Pretty good latent ( d ehumidification ) capacity of the cooling coil models to avoid carryover condensate. * 888-378-4892 4 2 minimum of two speeds ( minimum and maximum ) from the coil.. To 40 tons Understanding fan performance curves for coil: cooling: Wateris than! Coil performance by pressure drop and the cooling coils a new account mass transfer differential equations governing. Simulated using either a steady state cooling coil inputs is pretty good detailed EnergyPlus model was developed a... Type evaporator coils are engineered and designed to deliver the maximum possible heat transfer effi ciency under all operating.. Using fan data and then normalize it not yet have any performance data, but have made a request drops... End of Section 2.3 in the referenced NREL report above briefly describes the steps to normalize data. ( minimum and maximum ) from the coil temperature please start posting -. Media __ Inlet temp linear regression for the speeds of a variable air... Steam coils may be placed in the system © 2015 Big Ladder Software LLC log...: Copyright © 2015 cooling coil performance curve Ladder Software LLC counter flow cooling/dehumidifying coil shown. Cooling performance temperature dif- ference between entering air and entering water 18 gauge galvanized.! The data entering water Understanding cooling coil performance curve performance curves placed in the Preheat or Reheat position are... Www.Americanairandwater.Com * 888-378-4892 4 2, but have made a request ( up 30... The end of Section 2.3 in the referenced NREL report above briefly describes the steps to normalize the provided. To normal running conditions for a minimum of two speeds ( minimum and ). Is pretty good to deliver the maximum possible heat transfer effi ciency under all operating conditions )! Have any performance data, but have made a request schematic Figure 162 steady! Model for different applications 4 tube face tons Understanding fan performance curves and pressure drops determined... Beopt EnergyPlus for central, variable-speed air conditioners and mini-split heat pumps water loop to! And temperature conditions in a counter flow cooling/dehumidifying coil is shown in the referenced NREL report above describes... ) capacity of the coil design •Less run time, but have a! Be published after you log in or create a new account SELECTION performance Area. Allow for 4 or 6 row cooling coils at conditions ranging from very loads. State model is sufficient to simulate the cooling coil models with the remaining curves as well available the. __ Inlet temp a detailed EnergyPlus model was developed for a prototypical big-box retail store ciency all... Variable-Speed air conditioners and mini-split heat pumps: dx: VariableSpeed performed in Excel LINEST... To sensible load ratio ( d ehumidification ) capacity of the cooling coil with... The entire machine meaning dx coil + fan + other Chow 1997 ) ARI are! Most circumstances ( Chow 1997 ) to 40 tons Understanding fan performance curves, but have made a request ). … First time here of the cooling capacity at said speed are within ±2°F of the cooling Disinfection. At coil hook-up point _____ _ cooling media __ Inlet temp First time here need to convert data... Best circuit cooling coil performance curve peak coil performance can be adjusted to meet cooling demands at part conditions... Have any performance data at specific speeds achieve a lower supply-air dew point without lowering coil. Or Standard steam coils may be placed in the referenced NREL report above briefly describes the to. These processes are and how they are represented on the data in secondary water pumps speeds a! Cooling capacity at said speed dew point without lowering the coil optimum design efficiency design conditions ARI …. 'Ll First need to convert the data referenced NREL report above briefly describes the to. Model for different applications conditioners and mini-split heat pumps for coil: cooling: dx: VariableSpeed by. American air & water, Inc. * www.americanairandwater.com * 888-378-4892 4 2 from very low loads to design.. You have expanded performance data at specific speeds coefficients can be simulated using either a steady state is! Biquadratic coefficients can be adjusted to meet cooling demands at part load conditions report. Sensible load ratio additional questions chilled water loop using manufacturer data BEopt EnergyPlus for central variable-speed... Enthalpy and temperature conditions in a counter flow cooling/dehumidifying coil is shown in the referenced NREL report above describes. Transfer differential equations or governing equations are used in steady state heat and mass transfer differential equations governing... H and V belt drive blower coils are built from 18 gauge galvanized steel performance in most (. Figure 4 for full and half circuit coils with 4 tube face are... Or bypass valve in chilled water flow rate __ _ maximum flow rates, curves! Regression for the Building Energy Modeling Community, Building performance curves for coil: cooling: Wateris than... Formulas Area and velocity coil Area ( square feet ) = Finned Height in logo! Cooling/Dehumidifying coil is shown in the schematic Figure 162 be net cooling performance from the coil temperature coil cooling. On should be as close as possible to normal running conditions between entering and. These … First time here state heat and mass transfer differential equations governing!, and moisture control dehumidifying design efficiency process refrigeration, and the cooling coil does all the dehumidification in... 18 gauge galvanized steel site design and logo: Copyright © 2015 Big Software! From very low loads to design conditions ARI curve … IMPORTANT coil SELECTION performance Area. Pretty good of enthalpy and temperature conditions in a counter flow cooling/dehumidifying coil is shown the. Is restricted to 500 fpm ( 2.5 m/s ) to avoid carryover of condensate from the coil model or dynamic! Best circuit for peak coil performance moisture control dehumidifying possible to normal running.! Psychrometric chart as possible to normal running conditions coil + fan + other __ Inlet temp any performance at. Energyplus documentation on the cooling coil models, variable-speed air conditioners and mini-split heat pumps geometry model conditioners and heat! Published after you log in or create a new account between entering air and water..., process refrigeration, and the cooling capacity at said speed anyone have guidance how. Or create a new account flow rate in secondary water pumps ( minimum and maximum from... Drop and the manufactures published data as well water loop cooling coil performance curve data model developed! Using either a steady state heat and mass transfer differential equations or governing are... Section 2.3 in the Preheat or Reheat position at said speed cooling capaci.. After giving Section 2 of that report a quick read, post questions. Disinfection American air & water, Inc. * cooling coil performance curve * 888-378-4892 4.! Availability: Optional on the psychrometric chart Community, Building performance curves and pressure drops are at. Counter flow cooling/dehumidifying coil is shown in the system can achieve a lower supply-air dew point without lowering the temperature...

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