MECHANICAL CALCULATIONS USING REVIT

Transcription

1 MECHANICAL CALCULATIONS USING REVIT

2 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 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

3 OVERVIEW MAIN STEPS TO DOING ASHRAE VENTILATION CALCULATIONS IN REVIT 1. CREATE SPACES 2. CREATE ZONES 3. CREATE ASHRAE-SPECIFIC PARAMETERS 4. CREATE SCHEDULES 5. CREATE FORMULAS 6. STEP BACK AND LET REVIT CALCULATE

4 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 BOILERS COOLING SYSTEM: AIR COOLED CHILLERS AIR DISTRIBUTIONS SYSTEM: - INDOOR AIR HANDLING UNITS - SINGLE DUCT VAV BOXES WITH HOT WATER REHEAT COILS

5 ASHRAE 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

6 ASHRAE 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

7 ASHRAE A PART OF FGI 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 (WITH ERRATA BUT WITHOUT ADDENDA1). AND MECHANICAL VENTILATION SYSTEMS MUST BE DESIGNED USING THE VENTILATION RATES IN SECTION 7 OF THE STANDARD

8 ASHRAE OUTSIDE AIR FLOW AND SUPPLY AIR FLOW IS BASED ON MINIMUM AIR CHANGES PER HOUR EXHAUST AIR REQUIREMENTS ARE BASED ON MINIMUM AIR CHANGES PER HOUR STRICT ROOM PRESSURRIZATION REQUIREMENTS

9 ASHRAE 62.1 vs. ASHRAE 170 BOTH STANDARDS HAVE OUTSIDE AIR AND EXHAUST AIR REQUIREMENTS FOR SIMILAR SPACES CORRIDORS IN ASHRAE CFM/SF OF OUTSIDE AIR CORRIDORS IN ASHRAE 170 N/R TOILETS IN ASHRAE CFM/FIXTURE TOILETS IN ASHRAE ACH OF EXHAUST AIR PER ASHRAE THE MORE STRINGENT CRITERIA PREVAILS

10 REVIT - WHO, WHAT, HOW? MODEL ELEMENTS THE 3D GEOMETRY HOST ELEMENTS COMPONENTS DATUM ELEMENTS DEFINE PROJECT CONTEXT REFERENCE PLANS, GRIDS, LEVELS CATEGORY A GROUP OF ELEMENTS USED FOR MODELING (I.E. MECHANICAL EQUIPMENT) FAMILIES A SUBSET OF CATEGORY (I.E. VAV BOXES)

11 WHO, WHAT, HOW? REVIT ELEMENTS MODEL ELEMENTS DATUM ELEMENTS VIEW-SPECIFIC ELEMENTS HOSTS MODEL COMPONENTS ANNOTATION ELEMENTS DETAILS WALLS, FLOORS, ROOFS, CEILINGS DUCTS, PIPES, MECHANICAL EQUIPMENT, HVAC ZONES GRIDS LEVELS REFERENCE PLANES TEXT NOTES, TAGS, SYMBOLS, DIMENSIONS DETAIL LINES, FILLED REGIONS, 2D DETAIL COMPONENTS BASED ON BUILDING WITH ELEMENTS IN THE REVIT ARCHITECTURE 2010 USER S GUIDE

12 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 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

13 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 ARCHITECT S SPECIFIED CEILING HEIGHT AUTMOMATICALLY CAN BE PROBLEMATIC IF YOU WANT YOUR SCHEDULE TO READ WHERE A PIECE OF EQUIPMENT IS PHYSICALLY LOCATED

14 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 CAN CREATE SPACES WHICH ARE IRRELEVANT TO HVAC CALCULATIONS

15 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 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

16 REVIT SPACES SINCE 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.

17 REVIT SPACES ENSURE THAT MECHANICAL ANALYSIS TOOLS ARE TURNED ON THROUGH THE REVIT OPTIONS INTERFACE

18 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

19 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 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

20 FLOOR PLAN AFTER HITTING PLACE SPACES AUTOMATICALLY 20

21 REVIT SPACES SPACE NAMING UTILITY ALLOWS YOU TO AUTOMATICALLY NUMBER AND NAME YOUR SPACES TO MATCH THE ARCHITECTURAL ROOMS

22 REVIT SPACES USING THE ANNOTATION TOOLBAR TO AUTOMATICALLY TAG ALL THE SPACES

23 SELECT WHICH SPACE TAG YOU WISH TO USE SGJJR HAS SOME OF THEIR OWN STANDARDS BUT THERE ARE OUT OF THE BOX TAGS TOO.

24 POTENTIAL ISSUE/ERROR WITH PLACING ALL SPACES AUTOMATICALLY

25 EXCESS/UNNECESARY SPACE CLEAN-UP CREATE A SPACE SCHEDULE TO LIST ALL THE SPACES YOU JUST CREATED

26 USE THE PROPERTIES TOOLBAR TO ACCESS THE SORTING/ GROUPING GENERIC SPACE SCHEDULE WITH NAME, NUMBER, AND AREA PARAMETERS

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

28 WARNING MESSAGE FINAL PRODUCT DRAG TO SELECT ALL UNNAMED SPACES THEN RIGHT CLICK

29 SPACE TYPE SPACE PROPERTIES PEOPLE SPECIFY OCCUPANY

30 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

31 KEY SCHEDULES HOW TO IMPORTANT TO NAME YOUR KEY NAME TO BE WHAT YOU WANT TO BE THE DROP- DOWN MENU

32 KEY SCHEDULES HOW TO CREATE A PROJECT PARAMETER TO ADD TO YOUR KEY SCHEDULE ADD A NEW PARAMETER IMPORTANT TO SELECT APPROPRIATE TYPE OF PARAMETER

33 KEY SCHEDULES HOW TO LOTS OF MANUAL INPUT ONLY NEEDS TO BE DONE ONCE CAN BE COPIED FROM PROJECT TO PROJECT

34 EXPORT SPACES FROM REVIT OPEN YOUR PREVIOUSLY CREATED SPACE SCHEDULE SELECT EXPORTREPORTSSCHEDULE FROM THE MAIN REVIT MENU

35 EXPORT TO CHOSEN LOCATION RIGHT-CLICK RENAME AND CHANGE THE FILE TYPE STANDARD EXCEL FILE WITH STATIC REVIT INFORMATION

36

37 ZONES AND SYSTEMS SORTED BY ZONE 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

38 ZONES AND SYSTEMS ANALYZE TOOLBAR (SAME AREA AS SPACES PREVIOUSLY) EDIT ZONE MENU BAR

39 ZONES AND SYSTEMS HOVERING OVER A SPACE TO SELECT IT EDGES DARKEN TO HIGHLIGHT THAT IT HAS BEEN SELECTED

40 ZONES AND SYSTEMS

41 ZONES AND SYSTEMS - PROPERTIES

42 ZONES AND SYSTEMS ZONE BROWSER VIEW USER INTERFACE SYSTEM BROWSER ZONE BROWSER

43 ZONES AND SYSTEMS ZONE BROWSER ALLOWS YOU TO VIEW HELPFUL ZONE INFORMATION WITHOUT CREATING A SCHEDULE LIMITED INFORMATION CANNOT PERFORM CALCULATIONS

44 EDITING A ZONE

45 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

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

47 SORTING SELECT SORTING/GROUPING FROM THE PROPERTIES WINDOW SORTING/GROUPING PROPERTIES WINDOW

48 SORTING ONLY SCHEDULED FIELDS APPEAR IN THE SORT BY DROP-DOWN MENU SORTING HIERARCHY

49 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

50 SORTING

51 SORTING

52 SORTING CONDITIONAL FORMATTING

53 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

54 COLOR/HATCH LEGEND AND MAPPING ANALYZE MENU COLOR FILL LEGEND CREATION OF COLOR SCHEME

55 COLOR/HATCH LEGEND AND MAPPING Edit Scheme ASSIGN COLOR BASED ON HVAC ZONE CAN USE VARIOUS FILL PATTERNS AND COLORS

56 COLOR/HATCH LEGEND AND MAPPING TAG ALL ZONES ANNOTATE MENU FILLED IN COLOR MAP TAG ALL ZONES ANNOTATE MENU OUT OF THE BOX ZONE TAG

57 COLOR/HATCH LEGEND AND MAPPING TAGGED FLOORPLANS

58 COLOR/HATCH LEGEND AND MAPPING ALL COLORS CHANGED TO GREY AND FILL PATTERNS DIFFERENTIATED FOR B&W PRINTING.

59 CREATING PARAMETERS FOR CALCULATIONS FORMULAS FROM ASHRAE 62.1 VRP

60 CREATING PARAMETERS FOR CALCULATIONS FORMULAS FROM ASHRAE 62.1 VRP

61 CREATING PARAMETERS FOR CALCULATIONS FORMULAS FROM ASHRAE 62.1 VRP

62 CREATING PARAMETERS FOR CALCULATIONS ((Area / 1 SF) * AREA OUTDOOR AIR RATE RA) + (PEOPLE OUTDOOR AIR RATE RP * OCCUPANT DENSITY)

63 CREATING PARAMETERS FOR CALCULATIONS if(primary OUTDOOR AIR FRACTION Zp < 0.15, 1, PRIMARY OUTDOOR AIR FRACTION Zp * )

64 CREATING PARAMETERS FOR CALCULATIONS MANUAL INPUT OUTDOOR AIR INTAKE Vou / 0.6 REVIT CANNOT FIND THE MINIMUM OR MAXIMUM VALUE IN A COLUMN Ev NEEDS TO BE MANUALLY INPUTTED INTO THE FORMULA AFTER ALL SPACES ARE CALCUALTED

65 CREATING PARAMETERS FOR CALCULATIONS ASHRAE 170

66 CREATING PARAMETERS FOR ASHRAE 170 CALCULATIONS MAKE A PROJECT FOR CEILING HEIGHT AND USE CEILING HEIGHT*AREA = CALCULATED VOLUME (Area / 1 SF) * [CEILING HEIGHT (IN FT)] SPACE VOLUME USE THE INTEGRAL REVIT VOLUME PARAMETER THIS IS DEFINED BASED ON THE ROOM BOUNDING PARAMTERS FOR THE SPACE ([Calculated Volume (in cubic feet)] * MINIMUM OUTDOOR ACH) / 60 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

67 CREATING PARAMETERS FOR CALCULATIONS ASHRAE 170

68 COMPARE THE OUTPUT FROM THE REVIT SCHEDULES TO THE LEED ASHRAE 62.1 EXCEL SPREADSHEET

69 COMPARE THE OUTPUT FROM THE REVIT SCHEDULES TO THE LEED ASHRAE 62.1 EXCEL SPREADSHEET REVIT EXCEL SHEET

70 OTHER CALCULATIONS AND COMPARISONS HOT WATER REHEAT COIL SIZING CAN USE SORTED BY ZONE SCHEDULE TO CONFIRM AIRFLOW VALUES MATCH VAV BOX SIZING CALCULATED PARAMETER FOR SENSIBLE CAPACITY MINIMUM AIRFLOW* 1.1 * (LAT-EAT)

71 OTHER CALCULATIONS AND COMPARISONS HOT WATER REHEAT COIL SIZING -GPM SENSIBLE CAPACITY / (500 * (EWT - LWT))

72 OTHER CALCULATIONS AND COMPARISONS BUILDING PRESSURIZATION BY SYSTEM AHU-1 FLOW DIAGRAM RFA:1,800 RA:9,800 8,000 E: 500 P: 500 OA:2,800 SA:10,800

73 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 SPACE PROPERTIES ARE CHANGED AUTOMATIC COMPARISON BETWEEN DIFFERENT STANDARDS NOT FULLY AUTOMATED IT S A GOOD THING!!!

74 DISADVANTAGES CAN BE MADE FULLY AUTOMATED POTENTIAL FOR SLOW MODEL PERFORMANCE

75 REFERENCES SYNTAX AND ABBREVIATIONS CONDITIONAL STATEMENTS USER GROUP FORUMS

76 QUESTIONS? IF YOU THINK OF A QUESTION LATER, PLEASE US! IONEL PETRUS: IONEL.PETRUS@SMITHGROUPJJR.COM MARY OPALKA: MARY.OPALKA@SMITHGROUPJJR.COM