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  #1  
قديم 01-04-2012, 05:30 PM
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تاريخ التسجيل: May 2010
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شرح Residential Load Calculati**s Spreadsheet – Part **e



Residential Load Calculati** is designed to be simple and yet flexible. Follow al**g as I explain the uses for entry cell.

How to use?

Holding your cursor over any cell with a RED marker in the upper right reveals comments or helps to guide you thru the data entry. Validati** rules have been added as a helpful feature. Try entering 1 for small appliance circuit, the validati** is set for 2 minimum, by clicking ** cell “ E6” the code article pop-up window shows the corresp**ding article. If the window is in your way just pull it to the side and keep entering. Press the tap butt** to move from entry cell to entry cell.

To print go to the top of the page, next to file, edit, is view from there go down to custom views, you will find “calc w/ pool” and “calc no pool”. Select the **e you want to print and press the print butt**.

Residential Load Calculati** Spreadsheet manual:

Check the box in cell D6 next to the title of the sheet to use the “opti**al calculati** ART 220.82” instead of the “standard calculati** ART 220.42 THRU 220.55”


first :User Info. Worksheet

1- Enter the required informati** in the User Info. Worksheet As follows:

Company name
Address
City, state, Zip code
Teleph**e &fax
Serial number

sec**d:Residential Calculati** worksheet:

Step (1): Article 220.42 & 220.52


First: input data

1- For General Lighting load: Enter square foot/square meter living area by selecting from the drop down box, As per NEC 220-3 (b) the floor area shall be computed from the outside dimensi**s of the dwelling unit. For dwelling units, the computed floor area shall not include open porches, garages, or unused or unfinished spaces not adaptable for future use.

Note: a minimum square area permitted = 1000 square foot and The demand factors listed in table 220-42 (220.82(1) for opti**al method) shall apply to that porti** of the total branch-circuit load computed for general illuminati**. They shall not be applied in determining the number of branch circuits for general illuminati**.

2- For Small Appliance: as per NEC 220-11(c) (1) which need “two or **** 20 ampere small appliance branch circuits shall be provided for all receptacle outlets specified by secti** 210-52 (b) for small appliance load”

Note: Minimum of (2) circuits are required for small appliances

3- For Laundry circuit: as per NEC 220-11(c) (2) which need “at least **e additi**al 20 ampere branch circuit shall be provided to supply laundry receptacle outlet(s) required by secti** 210-52(f)”

Note: Minimum of **e circuit is required

Sec**d: output data

1- For General Lighting load: as per NEC 220-12 which need Lighting load for dwelling unit(s) that a unit load not less than 3 VA shall c**stitute the minimum lighting load for each square foot of floor area

2- For Small Appliance: as per NEC 220-52(A) which need that the load shall be computed at 1500 VA for each 2-wire small appliance branch circuit required by NEC 220-11(C)(1)

3- For Laundry circuit: NEC 220-52(B) A load not less than 1500 volt-amperes shall be included for each 2-wire laundry branch circuit installed as required by 210.11(C)(2)

4- For General load sum for lighting, small appliances and laundry loads: This is the sum total of (1) general lighting (living area square footage times 3 watts) , (2) each small appliance circuit @1500 watts each and laundry circuit @1500 watts

5- For General demand load sum: General load sum= First 3000VA @ 100% demand + Next 117,000 @35% demand +Reminder @ 25% demand

Step 2: Article 220.50 & 220.51


A check box is shown for selecti** between making Calculati**s for (A/C C**denser and fixed space heating) or (Heat ***** with c**current supplementary heating)

First case: (A/C C**denser and fixed space heating)


Input data:
1- Select the A/C C**denser cooling t**s from the drop down box #1 and you will get the electrical load in VA for A/C c**denser.

2- Select the fixed space heating (AHU) KW from the drop down box #2 and you will get the electrical load in VA for both strip heater and blower loads.

3- Select the quantities for A/C C**denser and/or fixed space heating AHU.

Output data:


1- Heating load in VA (heating Load =(space heat x demand factor + 100% (fan blower) )

2- Cooling load in VA (the blower fan from the AHU is included in this value)

3- Greater of Heating load @100% VS cooling load @ 100%
Sec**d case: (Heat ***** with c**current supplementary heating)

Input data:
1- Select the Heat pump t**nage from the drop down box #1 and you will get the electrical load in VA for Heat pump.

2- Select c**current supplementary heating KW from the drop down box #2 and you will get the electrical load in VA for both strip heater and blower loads.

3- Select the quantities Heat ***** with c**current supplementary heating.

Output data:
1- Heating load in VA (heating Load =(space heat x demand factor + 100% (fan blower) + 100% heat pump )



2- Horse power load in HP

3- Heating load @100%

To read **** and download the Residential Load calculati** spreadsheet, please visit the below links:

Electrical calculati**s spreadsheets at link:
http://alihassanelashmawy.blogspot.c...heet-main.html

Residential Load Calculati**s Spreadsheet – Part Two at link:
http://alihassanelashmawy.blogspot.c...lculati**.html


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  #2  
قديم 01-05-2012, 10:59 PM
الصورة الرمزية ahmedabotaher
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تاريخ التسجيل: Apr 2010
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