HVAC Constants (IP) - Derive HVAC Constants in SMath Options  Email this topic  Watch this topic  Print this topic » Normal Threaded

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ElSid		#1 Posted : 09 January 2021 04:24:21(UTC)
Rank: Advanced Member Groups: Registered Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)		Good evening, Looking for suggestions to better improve the maths. I am working on the write up on the side on another Sheet. I'm having an issue in when it comes to eliminating units, better yet, proving units cancel out. Suggestions on how to better derive and show the process is appreciated. HVAC Constants.sm (56kb) downloaded 20 time(s).
1 user thanked ElSid for this useful post.		on 09/01/2021(UTC)
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Razonar		#2 Posted : 09 January 2021 11:18:20(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,356 Was thanked: 815 time(s) in 516 post(s)		Originally Posted by: ElSid Good evening, Looking for suggestions to better improve the maths. I am working on the write up on the side on another Sheet. I'm having an issue in when it comes to eliminating units, better yet, proving units cancel out. Suggestions on how to better derive and show the process is appreciated. HVAC Constants.sm (56kb) downloaded 20 time(s). Hi. SMath convert all numbers to it rational approximation in symbolic outputs. Maybe you can use this trick: put Q*ΔT in units and use numeric evaluation: Best regards. Alvaro.
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ElSid		#3 Posted : 10 February 2021 19:22:13(UTC)
Rank: Advanced Member Groups: Registered Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)		Originally Posted by: Razonar Hi. SMath convert all numbers to it rational approximation in symbolic outputs. Maybe you can use this trick: put Q*ΔT in units and use numeric evaluation Best regards. Alvaro. Help with the highlighted please. How do I put the variables into Units? File is updated on my laptop to numeric evaluation.
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Jean Giraud		#4 Posted : 10 February 2021 20:20:26(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		The error message reads yellow not defined
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ElSid		#5 Posted : 10 February 2021 21:00:17(UTC)
Rank: Advanced Member Groups: Registered Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)		Originally Posted by: Jean Giraud The error message reads yellow not defined And ALVARO had a way around it where his SNIPPET/PICTURE shows what I want
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Razonar		#6 Posted : 10 February 2021 21:08:42(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,356 Was thanked: 815 time(s) in 516 post(s)		Originally Posted by: ElSid Help with the highlighted please. How do I put the variables into Units? File is updated on my laptop to numeric evaluation. HVAC Constants.sm (63kb) downloaded 8 time(s). Hi. Just write them: " Q*ΔT*'BTU/'hr " in the unit's placeholder. I attach the file too. Best regards. Alvaro. Edited by user 10 February 2021 21:10:48(UTC)  | Reason: Not specified
2 users thanked Razonar for this useful post.		on 10/02/2021(UTC),  on 10/02/2021(UTC)
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ElSid		#7 Posted : 10 February 2021 21:46:22(UTC)
Rank: Advanced Member Groups: Registered Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)		Originally Posted by: Razonar Hi. Just write them: " Q*ΔT*'BTU/'hr " in the unit's placeholder. Best regards. Alvaro. Got it. You force the solution (=) side to keep Q and ΔT as variables. I think I tried everything BUT that! Revised file HVAC Constants.sm (63kb) downloaded 6 time(s). Edited by user 10 February 2021 22:39:56(UTC)  | Reason: Uploaded the file
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