TRACE 90.1-04 Library

TRACE 90.1-04 Library
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  TRACE ®  700 ASHRAE 90.1-2004 Library   Preface The purpose of this document is to assist with understanding how TRACE ®  700 can help achieve ASHRAE 90.1-2004 compliancy with energy analyses. Assumptions were made for demonstration purposes. These assumptions will require adjustment based on individual analyses. All values are taken directly from Tables 6.8.1A-6.8.1G in ASHRAE Standard 90.1-2004. The values displayed in the Library  are based upon the same assumptions used in the following steps. The Equipment Type uses a standardized naming convention (i.e. 90.1-04 Min…) and is also based on these assumptions. INSTALLATION INSTRUCTIONS  To import the 90.1-2004 Library for TRACE ®  700: 1. Download  from the Website and extract the files. 2. Copy the library.exp  file into the default Projects directory (typically C:\CDS\TRACE700\PROJECTS) of the target PC. Note: If a library.exp already exists in the Projects directory, rename the existing file to avoid overwriting it (i.e. library_mm_yy.exp). 3. Start TRACE 700. 4. Select Actions  and click on Edit Libraries/Templates . This will open the Library/Template Editor (or click on the Library/Template Editor icon in the toolbar). In Library/Template Editor choose File, click on  Libraries and select any library from the drop-down list. 5. In the Library/Template Editors program, open the File  menu and select Import Custom Library  to merge the library files. A final import message will display indicating the process has been completed.    TRACE ASHRAE 90.1-2004 Library TRACE 700 ASHRAE 90.1-2004 Library was developed to help users create minimally compliant equipment. The following steps will guide the user through the equipment included in the Library. Unitary Equipment (Table 6.8.1A, 6.8.1B, and 6.8.1D ) Packaged Unitary Equipment is a combination of supply fan, condenser fan, and compressor energy that needs to be broken into respective categories. The following steps will help the user determine the correct full-load rate to input into the corresponding field in TRACE. The following is a set of guides and is also the convention used to create the 90.1-04 Library members. Please note, the values in the 90.1-04 Library are based upon assumptions and may need adjustment when using the following steps. Step 1: Conversion of SEER to kW/ton The values in the tables are taken directly from the Minimum Efficiency column and converted into kW/ton. For example, the first entry in the table 6.8.1A is converted from 12 SEER into a kW/ton: tonkW SEER /1535.1 *0394.2697.012 12   =+×  The next step is to break out the condenser fan energy   and the supply fan energy  . Step 2: Determine Condenser Fan Energy   The condenser energy is found in Table 6.8.1G for the air-cooled condenser. tonkW eff motor h Btu tonkW hphph Btu /05529.**92.0 050872.0/000,12746.0 000,176 1   ==⎟⎟ ⎠ ⎞⎜⎜⎝ ⎛ ××× −   * Deemed Savings, Installation & Efficiency Standards, Commercial and Industrial Cooling Equipment, Figure: 16 TAC §25.184(d)(2), prepared for the Public Utility Commission of Texas by Nexant, Inc. May 2003, p. 3 **   Correction for Motor efficiency is used because the nameplate horsepower is the motor output, the correction will account for the motor, and wiring losses. The increased electrical draw will reflect the actual electrical usage, or motor input, of that piece of equipment.   TRACE 700 is designed to account for the compressor heat that is rejected to the condenser. This added amount of energy makes the “heat rejection” tonnage larger than the nominal rated tonnage of the given piece of equipment. TRACE 700 uses a complex set of algorithms and takes numerous variables into account to calculate the exact amount of heat that is added to the system through compression. A simplified equivalent of 115% of the nominal tonnage is sent to the condenser, which is the heat rejection energy rate that is calculated below: 1.15 x .05529 kW/ton = 0.0636 kW/ton Step 3: Determine Supply-Fan Energy Estimate  Assumptions: To create any of the Packaged/Unitary pieces of equipment, the supply-fan energy will need to be estimated. For this example the supply-fan energy estimation will be: 400 cfm/ton 0.746 kW/hp 65,000 Btu/h If the horsepower (hp) of the supply fan is unknown, Steps 3a -3c will guide the user through the calculation. If the hp of the fan is known, skip to Step 3d. Step 3a – Calculate the unit tonnage tonsh Btutonh Btu   416.5/000,12 000,65  =⎟ ⎠ ⎞⎜⎝ ⎛ ×    Step 3b – Calculate the cfm of the unit using 400 cfm/ton. cfmtoncfmton   2166400416.5  =×   Step 3c – Calculate the hp of the supply fan Refer to Table G3.1.2.9 of Appendix G to determine the closest supply-fan brake horsepower   (bhp) based on the calculated cfm (Step 3b) and type of system ( constant volume  or variable-air volume ). This example will use less than 20,000 cfm and Constant Volume: 17.25 + (2166 – 20,000 ã 0.0008625) = 1.8684 hp   Step 3d – Convert hp to kW  The final step converts hp to kW and divides by the nominal tonnage: tonkW tonkW kW hpkW hp 257.0416.539386.139386.1746.8684.1 ==×   Step 4: Calculate Compressor-Only Energy Rate The compressor-only energy   rate is derived by subtracting supply-fan  and condenser energy   (converted to kW/ton) from the total system energy  : 1.1535 kW/ton System Energy (Step 1) -0.0636 kW/ton Condenser Energy (Step 2) -0.257 kW/ton Supply-fan Energy (Step 3) 0.8325 kW/ton Compressor Only Enter this compressor-only number in the Energy Rate  field.

Chapter 021

Jul 23, 2017

Chapter 024

Jul 23, 2017
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