february pes mechanical calculations using...

MECHANICAL CALCULATIONS USING REVIT

PRESENTATION OVERVIEW• ASHRAE 62.1 VENTILATION RATE PROCEDURE VS. ASHRAE 170 SPACE VENTILATION

• CREATE SPACES

• CREATE ZONE LEGEND

• CREATE A SPACE LEGEND

• HOW TO CREATE AND USE BASIC FORMULAS IN THE REVIT SCHEDULES

• CREATE PARAMETERS BASED ON ASHRAE 62.1 AND ASHRAE 170 FORMULAS

• CREATE THE ASHRAE 62.1 AND ASHRAE 170 FORMULAS IN REVIT

• CREATE KEY SCHEDULE REFERENCE SCHEDULE (FOR ASHRAE 62.1 AND ASHRAE 170 • CREATE KEY SCHEDULE REFERENCE SCHEDULE (FOR ASHRAE 62.1 AND ASHRAE 170

CALCULATIONS)

• PERFORM ASHRAE 62.1 AND ASHRAE 170 OUTSIDE AIR CALCULATIONS USING REVIT

SCHEDULES

• COMPARE THE OUTPUT FROM THE REVIT SCHEDULES TO THE LEED ASHRAE 62.1 EXCEL

SPREADSHEET

• SIZE REHEAT COILS FOR VAV BOXES, USING CALCULATED PARAMETERS IN REVIT

SCHEDULES

• ADVANTAGES AND DISADVANTAGES OF THIS METHOD

• QUESTIONS/DISCUSSION

OVERVIEWMAIN STEPS TO DOING ASHRAE VENTILATION CALCULATIONS IN REVIT

1. CREATE SPACES

2. CREATE ZONES

3. CREATE ASHRAE-SPECIFIC PARAMETERS

4. CREATE SCHEDULES

5. CREATE FORMULAS5. CREATE FORMULAS

6. STEP BACK AND LET REVIT CALCULATE

CASE STUDY

• VAV SYSTEM SERVES HEALTHCARE TYPE SPACES

• AND “OFFICE” TYPE SPACES

AREA: 25,000SF, ONE STORY

TYPES OF SPACES: MEDICAL OFFICE, REGULAR

OFFICE AND GYM

HEATING SYSTEM: HOT WATER CONDENSING HEATING SYSTEM: HOT WATER CONDENSING

BOILERS

COOLING SYSTEM: AIR COOLED CHILLERS

AIR DISTRIBUTIONS SYSTEM:

- INDOOR AIR HANDLING UNITS

- SINGLE DUCT VAV BOXES WITH HOT WATER

REHEAT COILS

ASHRAE 62.1 - 2007

• THE STANDARD ALLOWS FOR THE SYSTEM OUTSIDE AIR FLOW TO BE

CALCULATED BY CHOOSING ONE OF THE TWO METHODS

• VENTILATION RATE PROCEDURE - PRESCRIPTIVE

• INDOOR AIR QUALITY PROCEDURE - DESIGN• INDOOR AIR QUALITY PROCEDURE - DESIGN

ASHRAE 62.1 - 2007

• LEED NC (IEQ P1) MANDATES THE USE OF THE VENTILATION RATE

PROCEDURE WHEN CALCULATING SYSTEM OUTSIDE AIR FLOW

• STARTING WITH IMC 2009, THE SYSTEM OUTSIDE AIR FLOW IS

CALCULATED FOLLOWING THE VENTILATION RATE PROCEDURE

METHODOLOGY

ASHRAE 170 - 2008

• A PART OF FGI 2010 - APPLICABLE TO HEALTHCARE FACILITIES

• DOES NOT ADDRESS “OFFICE” TYPE SPACES

• LEED FOR HEALTHCARE

– MEET THE MINIMUM REQUIREMENTS OF SECTIONS 6 THROUGH 8 OF ASHRAE

STANDARD 170-2008 (WITH ERRATA BUT WITHOUT ADDENDA1).

AND

– MECHANICAL VENTILATION SYSTEMS MUST BE DESIGNED USING THE

VENTILATION RATES IN SECTION 7 OF THE STANDARD

ASHRAE 170 - 2008

• OUTSIDE AIR FLOW AND SUPPLY AIR FLOW IS BASED ON

• MINIMUM AIR CHANGES PER HOUR

• EXHAUST AIR REQUIREMENTS ARE BASED ON MINIMUM AIR • EXHAUST AIR REQUIREMENTS ARE BASED ON MINIMUM AIR

• CHANGES PER HOUR

• STRICT ROOM PRESSURRIZATION REQUIREMENTS

ASHRAE 62.1 vs. ASHRAE 170

• BOTH STANDARDS HAVE OUTSIDE AIR AND EXHAUST AIR

• REQUIREMENTS FOR SIMILAR SPACES

– CORRIDORS IN ASHRAE 62.1 – 0.06 CFM/SF OF OUTSIDE AIR

– CORRIDORS IN ASHRAE 170 – N/R

– TOILETS IN ASHRAE 62.1 – 50 CFM/FIXTURE

– TOILETS IN ASHRAE 170 – 10 ACH OF EXHAUST AIR– TOILETS IN ASHRAE 170 – 10 ACH OF EXHAUST AIR

• PER ASHRAE 170 - THE MORE STRINGENT CRITERIA PREVAILS

REVIT - WHO, WHAT, HOW?

• MODEL ELEMENTS – THE 3D GEOMETRY

• HOST ELEMENTS

• COMPONENTS

• DATUM ELEMENTS – DEFINE PROJECT CONTEXT

• REFERENCE PLANS, GRIDS, LEVELS

• CATEGORY• CATEGORY

• A GROUP OF ELEMENTS USED FOR MODELING (I.E. MECHANICAL

EQUIPMENT)

• FAMILIES

• A SUBSET OF CATEGORY (I.E. VAV BOXES)

WHO, WHAT, HOW?

REVIT ELEMENTS

MODEL ELEMENTS DATUM ELEMENTS VIEW-SPECIFIC ELEMENTS

HOSTS

WALLS, FLOORS, ROOFS, CEILINGS

MODEL COMPONENTS

DUCTS, PIPES, MECHANICAL EQUIPMENT, HVAC ZONES

GRIDS LEVELS REFERENCE

PLANES

ANNOTATION ELEMENTS

TEXT NOTES, TAGS, SYMBOLS,

DIMENSIONS

DETAILS

DETAIL LINES, FILLED REGIONS,

2D DETAIL COMPONENTS

BASED ON BUILDING WITH ELEMENTS IN THE REVIT ARCHITECTURE 2010 USER’S GUIDE

PARAMETERS

• PARAMETERS IN GENERAL ARE VARIABLES

• SHARED PARAMETERS: SHARED PARAMETERS ARE PARAMETERS THAT

YOU CAN ADD TO FAMILIES OR PROJECTS AND THEN SHARE WITH OTHER

FAMILIES AND PROJECTS. THEY GIVE YOU THE ABILITY TO ADD SPECIFIC

DATA THAT IS NOT ALREADY PREDEFINED IN THE FAMILY FILE OR THE

PROJECT TEMPLATE.

• PROJECT PARAMETERS: PROJECT PARAMETERS ARE PARAMETERS YOU • PROJECT PARAMETERS: PROJECT PARAMETERS ARE PARAMETERS YOU

DEFINE AND THEN ADD TO MULTIPLE CATEGORIES OF ELEMENTS IN A

PROJECT. THEY ARE SPECIFIC TO THE PROJECT AND CANNOT BE

SHARED WITH OTHER PROJECTS. YOU CAN THEN USE THOSE PROJECT

PARAMETERS IN MULTI-CATEGORY OR SINGLE-CATEGORY SCHEDULES.

• INSTANCE-BASED PARAMETERS

• TYPE-BASED PARAMETERS

REVIT SPACES

• LINKED ARCHITECTURAL FILE WILL HAVE ROOMS ASSIGNED WITHIN IT

• ROOM BOUNDING SHOULD BE TURNED ON FOR ALL WALLS AND

FLOORS

• ROOM BOUNDING FOR CEILING NEEDS TO BE A DISCUSSION

BETWEEN THE ARCHITECTS AND THE ENGINEERS EARLY ON

• IF CEILING HAS ROOM BOUNDING ON – ALL SPACES WILL END AT THE • IF CEILING HAS ROOM BOUNDING ON – ALL SPACES WILL END AT THE

ARCHITECT’S SPECIFIED CEILING HEIGHT AUTMOMATICALLY

• CAN BE PROBLEMATIC IF YOU WANT YOUR SCHEDULE TO READ

WHERE A PIECE OF EQUIPMENT IS PHYSICALLY LOCATED

REVIT SPACES

• SPACES “READ” THE ARCHITECT’S ROOM INFORMATION THROUGH THE

LINKED FILE

• PROCESS FACILITATED THROUGH “SPACE NAMING UTILITY” ADD-IN TOOL

• FREE THROUGH SUBSCRIPTION

• OTHER TOOLS AVAILABLE

• CAVEAT ABOUT ROOM SEPARATION LINES IN THE ARCHITECTURAL FILE• CAVEAT ABOUT ROOM SEPARATION LINES IN THE ARCHITECTURAL FILE

• CAN CREATE SPACES WHICH ARE IRRELEVANT TO HVAC CALCULATIONS

SCHEDULES

• A REVIT SCHEDULE APPEARS TO BE FAMILIAR TABULAR DATA BUT IS IN FACT A

DATABASE OUTPUT WITH COMPUTATIONAL FUNCTIONALITY BUILDING COMPONENT

SCHEDULE

• PULLS INFORMATION ALREADY IN THE MODEL AND COMPILES IT INTO THE

SCHEDULE

• FOR A PIECE OF EQUIPMENT THIS WOULD BE A PARAMETER LIKE MANUFACTURER

• COMPLETELY AUTOMATED IF INFORMATION IS PROPERLY SET UP AHEAD OF TIME

• KEY SCHEDULE• KEY SCHEDULE

• HAVE THE SAME CATEGORIES AS BUILDING COMPONENT SCHEDULE

• HELPFUL TO LIMIT THE NUMBER OF OPTIONS FOR A PARTICULAR

FIELD/PARAMETER

• FOR INSTANCE, USING THE MANUFACTURER EXAMPLE ABOVE YOU COULD LIMIT

THE MANUFACTURERS TO ONLY THOSE ALLOWED BY THE SPECIFICATIONS.

• BACKBONE OF DOING ASHRAE 62.1 AND ASHRAE 170 CALCULATIONS IN REVIT

REVIT SPACESSINCE REVIT IS NOW A SINGULAR FLAVOR

(I.E. NOT SPLIT INTO MEP AND

ARCHITECTURAL) YOU MAY NEED TO SET

UP WHAT TOOLBARS WILL BE VISIBLE THE

FIRST TIME YOU OPEN REVIT. (YOUR IT

DEPARTMENT CAN ALSO PRESET THESE

OPTIONS.) THESE PRESETS ARE VISIBLE

THROUGH THE OPTIONS MENU. THROUGH THE OPTIONS MENU.

REVIT SPACES

ENSURE THAT

MECHANICAL ANALYSIS

TOOLS ARE TURNED ON TOOLS ARE TURNED ON

THROUGH THE REVIT

OPTIONS INTERFACE

REVIT SPACES

ANALYZE TOOLBAR – WE’RE FOCUSING ON THE SPACES & ZONES

PORTION (THE LEFT SIDE)

MODIFY/PLACE SPACES MENU – APPEARS AFTER SELECTING “SPACE”

IN THE SPACES & ZONES TOOL AREA – TYPICALLY EASIEST TO SELECT

“PLACE SPACES AUTOMATICALLY”

REVIT SPACES

• UPPER LIMIT: THE LEVEL FROM WHICH TO MEASURE THE UPPER

BOUNDARY OF THE SPACE.

• OFFSET: THE DISTANCE AT WHICH THE UPPER BOUNDARY OF THE SPACE • OFFSET: THE DISTANCE AT WHICH THE UPPER BOUNDARY OF THE SPACE

OCCURS, MEASURING FROM THE UPPER LIMIT LEVEL. ENTER A POSITIVE

NUMBER TO GO ABOVE THE UPPER LIMIT LEVEL, OR ENTER A NEGATIVE

NUMBER TO GO BELOW IT.

• IF CEILING ROOM BOUNDING IS TURNED ON, OFFSET IS IGNORED AND

SPACE UPPER BOUNDARY IS THE CEILING

• IF CEILING ROOM BOUNDING IS TURNED OFF, OFFSET IS KEY TO

ENSURING THE APPROPRIATE SPACE VOLUME FOR ENSURING

ACCURATE ASHRAE 170 CALCULATIONS

DEFINITIONS COURTSEY OF AUTODESK

• FLOOR PLAN

AFTER HITTING

“PLACE SPACES

AUTOMATICALLY”

20

AUTOMATICALLY”

REVIT SPACES

SPACE NAMING UTILITY – ALLOWS YOU TO

AUTOMATICALLY NUMBER AND NAME YOUR

SPACES TO MATCH THE ARCHITECTURAL ROOMS

REVIT SPACES

• USING THE ANNOTATION TOOLBAR TO AUTOMATICALLY TAG

ALL THE SPACES

SELECT WHICH SPACE TAG YOU WISH

TO USE – SGJJR HAS SOME OF THEIR

OWN STANDARDS BUT THERE ARE

OUT OF THE BOX TAGS TOO.

POTENTIAL ISSUE/ERROR WITH PLACING ALL SPACES AUTOMATICALLY

EXCESS/UNNECESARY SPACE CLEAN-UP

CREATE A

SPACE SPACE

SCHEDULE TO

LIST ALL THE

SPACES YOU

JUST CREATED

USE THE

PROPERTIES

TOOLBAR TO

ACCESS THE

GENERIC SPACE SCHEDULE WITH NAME,

NUMBER, AND AREA PARAMETERS

ACCESS THE

SORTING/

GROUPING

SORT BY NAME – ASCENDING AND THEN ALL THE UNNAMED SPACES (I.E. AREAS WHICH ARE NOT ROOMS IN THE ARCHITECTURAL MODEL) WILL SORT TOGETHER

WARNING MESSAGE

FINAL PRODUCT

DRAG TO SELECT ALL UNNAMED SPACES THEN RIGHT CLICK

SPACE PROPERTIES

SPACE TYPE

PEOPLE – SPECIFY OCCUPANY

KEY SCHEDULES – HOW TO

PROJECT BROWSER –

RIGHT CLICK ON

SCHEDULES/QUANTITIES TO

CREATE A NEW SCHEDULE

NEW SCHEDULE MENU – NEED

TO SELECT A CATEGORY – FOR

ASHRAE 62.1 KEY SCHEDULE

YOU WANT “SPACES”


IMPORTANT TO NAME YOUR KEY NAME TO BE WHAT YOU WANT TO BE THE “DROP-DOWN” MENUDOWN” MENU


CREATE A PROJECT PARAMETER TO ADD TO YOUR KEY SCHEDULE

ADD A NEW PARAMETERIMPORTANT TO SELECT APPROPRIATE “TYPE” OF PARAMETER


LOTS OF MANUAL INPUT – ONLY NEEDS TO BE DONE

ONCE – CAN BE COPIED FROM PROJECT TO PROJECT

EXPORT SPACES FROM REVIT

OPEN YOUR PREVIOUSLY

CREATED SPACE SCHEDULE

SELECT EXPORT�REPORTS�SCHEDULE

FROM THE MAIN REVIT MENU

EXPORT TO CHOSEN LOCATION

RIGHT-CLICK “RENAME” AND CHANGE THEFILE TYPE

STANDARD EXCEL FILE

WITH STATIC REVIT

INFORMATION

ZONES AND SYSTEMS

SORTED BY ZONESCREENSHOT OF SORTED AND FILTERED

FILTERED BY AHU

SCREENSHOT OF SORTED AND FILTERED

SCHEDULED – THIS VIEW IS VERY HELPFUL FOR

COORDINATION WITH THE VAV MECHANICAL

EQUIPMENT SCHEDULE. ON THIS PARTICULAR

PROJECT, WE USED A MODIFIER OF 1- OR 2-

BEFORE THE VAV TAG TO DIFFERENTIATE

BETWEEN AHU-1 AND AHU-2. HOWEVER, AS SHOWN

ON SOME OTHER SLIDES, IF THIS IS NOT FEASIBLE

A SIMPLE TEXT PARAMTER CAN BE ADDED TO

DIFFERENTIATE BETWEEN AHU SYSTEMS

ZONES AND SYSTEMS

ANALYZE TOOLBAR (SAME AREA AS SPACES PREVIOUSLY)

EDIT ZONE MENU BAR

ZONES AND SYSTEMS

HOVERING OVER A SPACE TO SELECT IT

EDGES DARKEN TO HIGHLIGHT THAT IT HAS BEEN SELECTED

ZONES AND SYSTEMS

ZONES AND SYSTEMS - PROPERTIES

ZONES AND SYSTEMS – ZONE BROWSER

VIEW � USER INTERFACE � SYSTEM BROWSER

ZONE BROWSER

ZONES AND SYSTEMS – ZONE BROWSER

• ALLOWS YOU TO VIEW HELPFUL

ZONE INFORMATION WITHOUT

CREATING A SCHEDULE

• LIMITED INFORMATION

• CANNOT PERFORM CALCULATIONS

EDITING A ZONE

ADDITIONAL INFORMATION

• CREATE A TEXT PARAMETER FOR EASIER SCHEDULE SORTING (WE’LL GET TO THAT SOON!) FOR THE AHU SERVING THE AREA

• ALSO HELPFUL FOR THE CONTRACTOR

SORTING

SELECT ALL PERTINENT FIELDS AND CLICK ADD TO POPULATE THE SCHEDULE FIELD LIST

SORTING

SELECT “SORTING/GROUPING” FROM THE

PROPERTIES WINDOW

SORTING/GROUPING PROPERTIES

WINDOW

SORTING

SORTING HIERARCHYONLY SCHEDULED FIELDS APPEAR IN THE “SORT BY” DROP-DOWN MENU

SORTING

SORTING THIS WAY WILL GROUP ALL YOUR SPACES WITHIN THE SPACE ZONE TOGETHER

NOW THAT THE ZONES ARE GROUPED TOGETHER WE CAN USE INTERNAL SUMMATION TO HELP FURTHER

SORTING

SORTING – CONDITIONAL FORMATTING

COLOR/HATCH LEGEND AND MAPPING

• STEP-BY-STEP PROCESS OF CREATING COLOR LEGEND• CHANGING TO HATCHING FOR B&W PRINTS

• ALSO CAN BE TIED TO ASHRAE 62.1 OCCUPANCY TO DIFFERENTIATE BETWEEN ASHRAE 62.1 AND ASHRAE 170 SPACES

• HELPS CONTRACTOR DISTINGUISH BETWEEN ZONES FOR INSTALLATION PURPOSES

• ALSO USED FOR PRESSURE CONTROL AND SMOKE CONTROL ZONES


ANALYZE MENU – COLOR FILL LEGEND

CREATION OF COLOR SCHEME


Edit Scheme

ASSIGN COLOR BASED ON HVAC ZONE – CAN USE VARIOUS FILL PATTERNS AND COLORS


TAG ALL ZONES – ANNOTATE MENU

FILLED IN COLOR MAPTAG ALL ZONES – ANNOTATE MENU – OUT OF THE BOX ZONE TAG


TAGGED FLOORPLANS


ALL COLORS CHANGED TO GREY AND FILL PATTERNS DIFFERENTIATED FOR B&W PRINTING.

CREATING PARAMETERS FOR CALCULATIONS

• FORMULAS FROM ASHRAE 62.1 VRP


• ((Area / 1 SF) * AREA OUTDOOR AIR RATE RA) +

(PEOPLE OUTDOOR AIR RATE RP * OCCUPANT

DENSITY)


if(PRIMARY OUTDOOR AIR FRACTION Zp < 0.15, 1, PRIMARY

OUTDOOR AIR FRACTION Zp * -1 + 1.15)


OUTDOOR AIR INTAKE Vou / 0.6

MANUAL INPUT

REVIT CANNOT FIND THE MINIMUM OR MAXIMUM VALUE IN A COLUMN – EvNEEDS TO BE MANUALLY INPUTTED INTO THE FORMULA AFTER ALL SPACES ARE CALCUALTED


• ASHRAE 170

CREATING PARAMETERS FOR ASHRAE 170 CALCULATIONS

(Area / 1 SF) * [CEILING HEIGHT (IN FT)]

SPACE VOLUME

MAKE A PROJECT FOR CEILING HEIGHT AND USE CEILING HEIGHT*AREA = CALCULATED VOLUME

USE THE INTEGRAL REVIT VOLUME PARAMETER –THIS IS DEFINED BASED

ON THE ROOM BOUNDING

([Calculated Volume (in cubic feet)] * MINIMUM OUTDOOR ACH) / 60

HEIGHT (IN FT)]

METHODOLOGY SHOWN ON THIS SLIDE INVOLVES MANUALLY INPUTTING CEILING HEIGHT – THIS METHOD MAY BE PREFERRED IF YOU DON’T WANT TO USE YOUR CEILING TO BE ROOM BOUNDING – HELPFUL FOR ABOVE THE CEILING EQUIPMENT SCHEDULING

ON THE ROOM BOUNDING PARAMTERS FOR THE

SPACE


• ASHRAE 170

COMPARE THE OUTPUT FROM THE REVIT SCHEDULES TO

THE LEED ASHRAE 62.1 EXCEL SPREADSHEET

COMPARE THE OUTPUT FROM THE REVIT SCHEDULES TO

THE LEED ASHRAE 62.1 EXCEL SPREADSHEET

REVIT

EXCEL SHEET

OTHER CALCULATIONS AND COMPARISONS HOT WATER REHEAT COIL SIZING

MINIMUM AIRFLOW* 1.1 * (LAT-EAT)

CALCULATED PARAMETER FOR SENSIBLE CAPACITY

CAN USE SORTED BY ZONE SCHEDULE TO CONFIRM AIRFLOW VALUES MATCH VAV BOX SIZING

OTHER CALCULATIONS AND COMPARISONS

• HOT WATER REHEAT COIL SIZING - GPM

SENSIBLE CAPACITY / (500 * (EWT - LWT))

OTHER CALCULATIONS AND COMPARISONS

• BUILDING PRESSURIZATION BY SYSTEM

RA:9,800RFA:1,800

8,000E: 500

AHU-1 FLOW DIAGRAM

SA:10,800OA:2,800

8,000P: 500

ADVANTAGES

• ONE STOP SHOP

• REMOVES THE NEED FOR SEPARATE EXCEL CALCULATIONS

• REDUCES DESIGN TIME

• LINKED TO THE ARCHITECTURAL MODEL

• AUTOMATIC UPDATE OF THE SYSTEM OUTSIDE AIR FLOW WHEN THE • AUTOMATIC UPDATE OF THE SYSTEM OUTSIDE AIR FLOW WHEN THE

SPACE PROPERTIES ARE CHANGED

• AUTOMATIC COMPARISON BETWEEN DIFFERENT STANDARDS

• NOT FULLY AUTOMATED – IT’S A GOOD THING!!!

DISADVANTAGES

• CAN BE MADE FULLY AUTOMATED

• POTENTIAL FOR SLOW MODEL PERFORMANCE

REFERENCES

• SYNTAX AND ABBREVIATIONS

• CONDITIONAL STATEMENTS

• USER GROUP FORUMS

QUESTIONS?

IF YOU THINK OF A QUESTION LATER, PLEASE EMAIL US!

IONEL PETRUS: [email protected] OPALKA: [email protected]

february pes mechanical calculations using...

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