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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
REVIT SPACES
SPACE NAMING UTILITY – ALLOWS YOU TO
AUTOMATICALLY NUMBER AND NAME YOUR
SPACES TO MATCH THE ARCHITECTURAL ROOMS
SELECT WHICH SPACE TAG YOU WISH
TO USE – SGJJR HAS SOME OF THEIR
OWN STANDARDS BUT THERE ARE
OUT OF THE BOX TAGS TOO.
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
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”
KEY SCHEDULES – HOW TO
IMPORTANT TO NAME YOUR KEY NAME TO BE WHAT YOU WANT TO BE THE “DROP-DOWN” MENUDOWN” MENU
KEY SCHEDULES – HOW TO
CREATE A PROJECT PARAMETER TO ADD TO YOUR KEY SCHEDULE
ADD A NEW PARAMETERIMPORTANT TO SELECT APPROPRIATE “TYPE” OF PARAMETER
KEY SCHEDULES – HOW TO
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
HOVERING OVER A SPACE TO SELECT IT
EDGES DARKEN TO HIGHLIGHT THAT IT HAS BEEN SELECTED
ZONES AND SYSTEMS – ZONE BROWSER
• ALLOWS YOU TO VIEW HELPFUL
ZONE INFORMATION WITHOUT
CREATING A SCHEDULE
• LIMITED INFORMATION
• CANNOT PERFORM CALCULATIONS
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
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
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
COLOR/HATCH LEGEND AND MAPPING
Edit Scheme
ASSIGN COLOR BASED ON HVAC ZONE – CAN USE VARIOUS FILL PATTERNS AND COLORS
COLOR/HATCH LEGEND AND MAPPING
TAG ALL ZONES – ANNOTATE MENU
FILLED IN COLOR MAPTAG ALL ZONES – ANNOTATE MENU – OUT OF THE BOX ZONE TAG
COLOR/HATCH LEGEND AND MAPPING
ALL COLORS CHANGED TO GREY AND FILL PATTERNS DIFFERENTIATED FOR B&W PRINTING.
CREATING PARAMETERS FOR CALCULATIONS
• ((Area / 1 SF) * AREA OUTDOOR AIR RATE RA) +
(PEOPLE OUTDOOR AIR RATE RP * OCCUPANT
DENSITY)
CREATING PARAMETERS FOR CALCULATIONS
if(PRIMARY OUTDOOR AIR FRACTION Zp < 0.15, 1, PRIMARY
OUTDOOR AIR FRACTION Zp * -1 + 1.15)
CREATING PARAMETERS FOR CALCULATIONS
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
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
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!!!
QUESTIONS?
IF YOU THINK OF A QUESTION LATER, PLEASE EMAIL US!
IONEL PETRUS: [email protected] OPALKA: [email protected]