I do not yet have any performance data, but have made a request. Coil options allow for 4 or 6 row cooling coils. 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. Performance data Is available by contacting SERFILCO. 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. three-way valve or bypass valve in chilled water loop. The input required to model the coil includes only a set of thermodynamic design inputs, which require no specifi… 0000007206 00000 n The CDQ wheel transfers water vapor, and the cooling coil does all the dehumidification work in the system. 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. The crux is performing a linear regression on the data. 0000001026 00000 n This will help me with the remaining curves as well. 0000008445 00000 n 0 The data provided by the manufacturer will likely be net cooling performance. The cooling coil performance can be simulated using either a steady state model or a dynamic model for different applications. 0000005371 00000 n link text. Steam pressure at coil hook-up point _____ _ Cooling media __ Inlet temp. cooling coils). 0000003731 00000 n 0000001482 00000 n The end of Section 2.3 in the referenced NREL report above briefly describes the steps to normalize the data. Do you have expanded performance data at specific speeds? 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). All rights reserved. A steady state model is sufficient to simulate the cooling coil thermal performance in most circumstances (Chow 1997). The linear regression for the biquadratic coefficients can be performed in Excel using LINEST. × Finned Length In. Please note that the coil performance curve provided by ASHRAE should be considered more a theoretical representation or symbol, rather than an actual curve. performance of the cooling coils at conditions ranging from very low loads to design conditions. 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. 0000003430 00000 n output can be adjusted to meet cooling demands at part load conditions. 0000001217 00000 n Coil Area (square feet) = Finned Height In. Specialty Coils up to 40 tons 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. You can also consult a report from several years ago that outlines the process for determining performance curve inputs using manufacturer data. 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. The ARI ratings are for the entire machine meaning dx coil + fan + other. <<7474CE3C7D03AF4AB1F478C599A7D3F2>]>> IMPORTANT COIL SELECTION PERFORMANCE FORMULAS AREA and VELOCITY Coil Area (square feet) = Finned Height In. 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. ___ Flow rate __ _ Maximum flow rates, performance curves and pressure drops are determined at the factory for optimum design efficiency. startxref Request a Quote Download / View PDF. Rated for 300psig. Willies Carrier, the developer of air washers, surmised that an alternative design using direct contact between the air and chilled water might improve performance. 0000000016 00000 n Direct expansion type evaporator coils are engineered and designed to deliver the maximum possible heat transfer effi ciency under all operating conditions. 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. Understanding Fan Performance Curves. 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. 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 simple model provides a good prediction of the air and water outlet conditions without requiring the detailed geometric input required for the detailed model. ÷ 144 . Water Cooling Coils. Jon. See Figure 4 for full and half circuit coils with 4 tube face. × Finned Length In. The air on humidity will also effect the total load to sensible load ratio. Fan curves are simply graphs showing fan performance, normally with air volume on the horizontal “x” axis, and pressure on the vertical “y” axis. performance of the traditional cooling coil. Face velocity is restricted to 500 fpm (2.5 m/s) to avoid carryover of condensate from the coil. The latent (d ehumidification) capacity of the cooling coil increases with out increasing its total cooling capaci ty. QUALITY PRODUCT H and V belt drive blower coils are built from 18 gauge galvanized steel. 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). 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. I am trying to build performance curves for the speeds of a variable speed air conditioner. 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 input object Coil:Cooling:Wateris simpler than the detailed geometry model. This reduces the chilled water flow rate in secondary water pumps. The EnergyPlus documentation on the cooling coil inputs is pretty good. Coil data is based on 125° (51°C) temperature dif- ference between entering air and entering water. Models MPX ERCH VER Airflow Range Min. The curve is normalized to have the value of 1.0 when the actual air flow … 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. 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. 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. Site design and logo: Copyright © 2015 Big Ladder Software LLC. 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. After giving Section 2 of that report a quick read, post additional questions. 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. 7660 Quincy St. Willowbrook,Illinois 60527 Buy Parts Online Drawing Package This represents the typical input conditions of 55° (13°C) entering air (EAT) and 180° (82°C) entering water (EWT). 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. The wide variety of circuiting available offers the opportunity to provide the best circuit for peak coil performance. 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. 318 0 obj <> endobj Coil Performance –Load vs. Flow •Only conditions where entering water temp. 0000004827 00000 n DETERMINING SPECIFIC HEATING REQUIREMENTS FOR SERFILCO IMMERSION HEATERS TO DETERMINE THE HEATING … Hope that helps some. 0000003653 00000 n xÚb```b``>ÎÀ VE 2016 ApacheHVAC User Guide part B: Equipment, Loops, Components, and Controls 1 ApacheHVAC User Guide part B: Equipment, Loops, Components, and Controls Proper selection is the balance of both criteria. Availability: Optional on the MPX, ERCH, and VER models (up to 30 tons). 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. 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