Lena Web Solutions

Sunday, November 11, 2018

Tutorials November 11, 2018

How to Draw Tee with Radius Elbow in HVAC Ducts

Hello Every One,

Today I will show you how to draw Rectangle Ducts Tee, using LISP.

Download the required lisp from here then add it to Autocad Lisps and run the Lisp by typing "tb" in the command bar then do as show below:

1-After running the lisp it will ask you to:

-pick the outer side of the main duct.

-pick the inner side of the main duct.

-Enter air flow quantity (CFM) for the main

-pick the inner side of the first branch duct.

-pick the outer side of the first branch duct.

-pick the outer side of the second branch duct.

-pick the inner side of the second branch duct.

2-Pick lines as shown in screenshot below:

3-After choosing lines as described above the lisp will draw the elbow for you !

Note: you can enter the proportion values for the CFM like(enter 6 for the main duct and if the flow is equally divided enter 3 for first branch and accordingly the scond will be calculated to be 3 or if not equally splits enter the proportion values for the division for example "4:2")

For more illustration see the video below:

Download the Lisp from here

Note: you can use this lisp to draw other duct fittings like duct elbows,duct branch with 45°take-off and duct branches with two elbow in same direction for more details see the below link

-To download more Lisps for HVAC Design drawings go to:

Autocad LISPS for HVAC Design Drawings

-If you get any error when extracting the compressed file download the latest winrar Version

Technology Castle 0

Thursday, October 25, 2018

Tutorials October 25, 2018

How to Draw Branches with 45° Take-Off

HVAC drawings with LISPS is awesome!

In this tutorial i will show you how to draw a duct branch from the main duct with 45° take-off.

do as described below and you find that drawing with lisp is very easy and faster.

1- Download the required lisp from here then add it to Autocad Lisps and run the Lisp by typing "tt" in the command bar then press enter.
2-After running the Lisp it will ask you to :
-pick inner side of branch duct.
-pick outer side of branch duct.
-pick the direction of take-off from the main duct(which is the direction of flow)
See screenshot below:

3- pick lines as shown in the above screenshot and the Lisp will draw the required 45° take-off for you!

for more illustration see video below-------->>>

Download the Lisp from here

-To download more Lisps for HVAC Design drawings go to:

Autocad LISPS for HVAC Design Drawings

-If you get any error when extracting the compressed file download the latest winrar Version

Technology Castle 0

Monday, October 22, 2018

HVAC Softwares October 22, 2018

McQuay Duct Sizer

Our Blog is Your Source for Design Tools and Expertise to Help You Optimize your HVAC System Design.

McQuay Duct Sizer

McQuay Duct Sizer for Calculating Air Duct Dimensions in SI & IP Units for HVAC Systems:

Technology Castle 0

Design Tools October 22, 2018

Carrier Load Calculation Sheet

Our Blog is Your Source for Design Tools and Expertise to Help You Optimize your HVAC System Design.

Carrier Load Calculation Sheet

Excel Sheet for Estimating The Cooling & Heating Loads:

Technology Castle 0

Sunday, October 21, 2018

Tutorials October 21, 2018

How to Draw Elbows in HVAC Ducts

Hello Every One,

Today I will show you how to draw Round Radius Elbows In Ducts, using LISP.

Download the required lisp from here then add it to Autocad Lisps and run the Lisp by typing "ee" in the command bar then do as show below:

1-After running the lisp it will ask you to:

-pick the outer side of the main duct.

-pick the inner side of the main duct.

-pick the inner side of the branch duct.

-pick the outer side of the branch duct.

2-Pick lines as shown in screenshot below:

3-After choosing lines as described above the lisp will draw the elbow for you !

For more illustration see the video below:

Download the Lisp from here

Note: you can use this lisp to draw other duct fittings like duct tee,duct branch with 45°take-off and duct branches with two elbow in same direction for more details see the below link

-To download more Lisps for HVAC Design drawings go to:

Autocad LISPS for HVAC Design Drawings

-If you get any error when extracting the compressed file download the latest winrar Version

Technology Castle 0

Monday, September 24, 2018

Tutorials September 24, 2018

Autocad LISPS for HVAC Design Drawings

Download Lisp Files for HVAC Design Drawings

What is the AutoLISP ?

AutoLISP is based on the LISP programming language, which is simple to learn and very powerful. Because AutoCAD has a built-in LISP interpreter, you can enter AutoLISP code at the Command prompt or load AutoLISP code from external files.

AutoLISP is an application interface for automating of design tasks. When an AutoLISP application is loaded, it functions in its own namespace for each drawing that is open. A namespace is an insulated environment keeping AutoLISP applications that are specific to one drawing from having symbol or variable name and value conflicts with those in another drawing. For example, the following line of code sets a different value to the symbol a when executed in each open drawing.

Lisp Name	Lisp Function Description	Lisp Run Command	Download Lisp File
Area	Used To Calculate the Area of any Shape(rooms,spaces,..etc) in Autocad 2D plans	AA	Download
Flexible	Used To Draw a Flexible Duct Connection like the Connection Between the duct and Air Outlet in Autocad 2D plans	FLEX	Download
ADD	Used To Add Numbers and Show The Sum in Autocad 2D plans	ADD	Download
Duct Fittings	Used To Draw all Important Duct Fittings Like Elbows,Take-Off and Tee Branch in Autocad 2D plans	EE for Elbows,TT for Take-offs,TB for Tee Branch & TE for Tee Branch with two Elbows	Download
Duct and Pipe	Used To Draw a Multi-line HVAC Ducts and Pipes in Autocad 2D plans	"duct" to draw Ducts "Pipe" to draw Pipes.	Download