- 5Equations
CLTD/CLF/SCL cooling load calculation techniqueedit
Load Calculation Software. Conduction transfer functions and periodic response factors required by ASHRAE’s heat balance and radiant time series load calculation methods. This program is suitable for Windows 95/98/ME/NT/2000/XP systems. Limitations of Simplified Load Calculation Procedures (pdf) RTS Excel Spreadsheet (xls) Oklahoma. Uses ASHRAE commercial load calculation methods using Right-Draw or the. Calculations), and supports both CLTD and RTS load calculation methods. This program uses the 24-hour by 12 month ASHRAE Handbook of Fundamentals methods to compute light, medium or heavy heating and cooling loads for an.
The CLTD/CLF/SCL (cooling load temperature difference/cooling load factor/solar cooling load element) cooling load calculation method was very first presented in the 1979 ASHRAE Cooling and Heating system Load Manual (GRP-158)1The CLTD/CLF/SCL Technique is deemed as a fairly accurate approximation of the overall heat gains through a building cover for the purposes of dimension HVAC apparatus. This method was created as a simpler calculation alternate to hard and unwieldy calculation methods like as the move function method and the Sol-air temperatures technique.2Error when using the CLTD/CLF/SCL method is inclined to end up being much less than twenty percent over and much less than ten percent under.1
Historyedit
After its introduction in the 1979 ASHRAE guide, research continued on improving the accuracy of the CLTD/CLF technique. Research completed in 1984 revealed some factors which had been not accounted for in the primary distribution of the technique; these results had been a result of the ASHRAE study project 359. In 1988 ASHRAE Research Project 472 worked well to right these oversights with the intro of a classification program for walls, roofs, and areas. Furthermore, a weighting element database has been generated to help appropriate for prior inaccuracies. Additional research in Cold weather radiation and device heat gain with regard to CLTD information was furthermore completed soon after the first distribution of the method. The developments in each of these areas influenced a revising/compilation work, and in 1993 the CLTD/CLF/SCL technique had been succinctly created by Spitler, McQuiston, and Lindsey.1
Softwareedit
The CLTD/CLF/SCL method uses established established of data to expedite and simplify the process of cooling/heating load approximation. The information is divided into several different areas structured on numerous different variables. These variables include, building materials of the package, thicknesses of the building materials, day time of the yr, time of day, positioning of the surface (age.g. wall structure or roof, 90 levels or 180), and wall structure face orientation (cardinal directions, i.elizabeth. N, NW, H, SE, etc.), to title a several. In order to determine which set of CLTD/CLF/SCL data to appear at, all the requisite factors must become described.1
The particular dining tables of data were generally created by using the more complex transfer function technique to determine the various cooling loads for different varieties of heating.23The results acquired by performing therefore are after that normalized for each kind of high temperature gain used for the furniture, CLTD, CLF, and SCL.4
Description of variablesedit
The first of the cooling load factors utilized in this method is certainly the CLTD, or the Cooling Load Temperature Difference. This element is utilized to symbolize the heat distinction between indoor and outside air flow with the addition of the heating system results of solar radiation.15
The second factor is definitely the CLF, or the cooling load aspect. This coefficient balances for the period lag between the outdoor and in house heat peaks. Depending on the properties of the building package, a delay will be present when observing the quantity of warmth being transferred within from the outdoors. The CLF is usually the cooling load at a given time likened to the warmth gain from previously in the day.15
The SC, or shading coefficient, is usually used widely in the assessment of high temperature get through cup and windows.15
Finally, the SCL, or solar energy cooling load factor, balances for the variables related with solar warmth load. These consist of the worldwide coordinates of the site and the dimension of the framework.15
Equationsedit
The equations for the use of the data retrieved from these tables are really basic.
Q= temperature gain, usually heat get per device period
A= surface area area
U= Overall heat exchange coefficient
CLTD= cooling load temperature distinction
SCL= solar cooling load element
CLF= cooling load factor
SC= shading coefficient
For temperature get through walls, doors, roofs, and home windows (just windowpane conduction)edit
Q = U.A new.CLTD15
Q = U.A.(T2-T1)
Where Queen = General heat move in Btu per hour
For temperature gains credited to individuals, apparatus (hooded and unhooded), and lightsedit
Queen = Queen.CLF15
For solar energy heat gains through home windows and glazed surfacesedit
Queen = A.SC.SCL15
Data tablesedit
In inclusion to desks published by ASHRAE for select latitudes, a pc program called CLTDTAB, available since 1993, can be used to produce custom made CLTD/CLF/SCL dining tables for a particular zone type for any latitude and 30 days. This allows the use of this technique, without interpolation, for any region in the entire world.1
If the program CLTDTAB can be utilized, the results obtained using this method will have a tendency to become very near to the even more arduous TFM Technique mentioned previously.1
Sourcesedit
- ^acddelizabethfglijkdmichaelSpitler, J.D., F.D. McQuiston, E. Lindsey. 1993. The CLTD/SCL/CLF Cooling LoadCalculation Method, ASHRAE Dealings. 99(1): 183-192.
- ^anMcQuiston, Y.G., and J.Chemical. Spitler. 1992. Cooling and heating system load calculation manual. Atlanta: ASHRAE
- ^Matalas, Gintas G. 1972. Exchange Function Technique of Calculating Cooling A good deal, Heat Extraction And Space Temperatures, ASHRAE Log. Vol. 14, Zero. 12: 54-56.
- ^Lindsey, K. 1991. Revising of the CLTD/CLF Cooling Load Calculation Technique. M.S. thesis, Oklahoma Condition University or college.
- ^amchemicaldelizabethfgMcQuiston, Faye D., Parker, Jerald D., Spitler, Jeffrey Chemical. Heating, Ventilation, and Air flow Health and fitness: Analysis and Design, p216-278. 2005, Bob Wiley and Sons, Inc.
Gathered from 'https://en.wikipedia.org/w/index.php?title=Coolingloadtemperaturedifferencecalculationmethodamp;oldid=868485121'
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