STUDENT SERVICES BUILDING HOWARD COMMUNITY COLLEGE COLUMBIA, MD TECHNICAL ASSIGNMENT #1 ASHRAE STANDARD VENTILATION COMPLIANCE EVALUATION
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1 STUDENT SERVICES BUILDING HOWARD COMMUNITY COLLEGE COLUMBIA, MD TECHNICAL ASSIGNMENT #1 ASHRAE STANDARD VENTILATION COMPLIANCE EVALUATION Jason P. Fair Mechanical Option October 5, 2005
2 Student Services Building Howard Community College Jason Fair Mechanical Technical Assignment #1 TABLE OF CONTENTS: PAGE Executive Summary 2 Variable Definitions.3 Calculations..4 Ventilation vs IAQ..5 AHU Spread Sheets 10/5/2005 page 1/5
3 Student Services Building Howard Community College Jason Fair Mechanical Technical Assignment #1 Executive Summary: The ventilation system of the Student Services Building at Howard Community College was evaluated using ASHRAE The results of this evaluation are that the designed system meets and exceeds the ventilation required by the latest ASHRAE ventilation standard. The 6 air handling systems in the Student Services Building are typical Variable Air Volume with reheat type systems except AHU #6 which is a Constant Volume Variable Temperature with reheat. AHU #1 has a capacity of 36,300 cfm and serves the 1 st floor, atrium,2 nd floor, and 3 rd floor. AHU #2 has a capacity of 32,300 cfm and serves the south wing 2 nd and 3 rd floors. AHU #3 has a capacity of 11,000 cfm and serves the south wing 4 th floor. AHU #5 has a capacity of 15,000 cfm and serves the south wing 1 st floor dining room. AHU #6 has a capacity of 5700 cfm and serves the South wing first floor kitchen. The difference in the designed outdoor air requirements verses the required OA requirements per ASHRAE Standard is due to the fact that the design team used the ventilation requirements of ASHRAE Standard The majority of the spaces were designed for 20 cfm per person and the new Standard typically only calls for 5 cfm per person in addition to 0.06cfm/ft 2. 10/5/2005 page 2/5
4 Student Services Building Howard Community College Jason Fair Mechanical Technical Assignment #1 VARIABLES: Az = zone floor area: D = occupant diversity Ez = The zone air distribution effectiveness determined using Table 6-2. Ps = system population Pz = zone population: Ra = outdoor airflow rate required per unit area as determined from Table 6-1. Rp = outdoor airflow rate required per person as determined from Table 6-1. Vbz = the breathing zone outdoor airflow Vot = the outdoor air intake flow Vou = The design uncorrected outdoor air intake Note: The uncorrected outdoor air intake (Vou) is adjusted for diversity but uncorrected for ventilation efficiency. Vpz = the zone primary airflow, Note: For VAV systems, Vpz is the minimum expected primary airflow for design purposes. Zp = the zone primary outdoor air fraction 10/5/2005 page 3/5
5 Student Services Building Howard Community College Jason Fair Mechanical Technical Assignment #1 CALCULATIONS: Sample calculation for AHU-1 is VAV zone 45 Career Services Office& Computer Lab A z = 985 ft 2 P z = 25 People Occupancy Category = Computer Lab (Table 6-1) R p = 10 cfm/person R a = 0.12 cfm/ ft 2 E z = 1.0 V bz = Pz*Rp + Az*Ra V bz = 25* *0.12 = 368.2cfm V oz = V bz /E z V oz = 368.2cfm/1.0 = 368.2cfm V pz = 1970cfm (design value) Z p = V oz /V pz Z p = 368.2cfm/1970cfm Z p = Ps = 25 people D = Ps / ΣPz = 25 people / 25 people = 1.0 Vou = D Σall zones RpPz + Σall zones RaAz = (1.0)(5,920) + (31,193) = 37,113 cfm Max Zp = Ev = 0.60 Vot = Vou / Ev = 37,113 / 0.6 = 61,855 cfm Design Outdoor Air Flow = 5,920 cfm (19% OA) ASHRAE Std Required OA flow (Vot) = 3,248 cfm (10% OA) 19% > 10% Conclusion: AHU-1 DOES satisfy ASHRAE Std /5/2005 page 4/5
6 Student Services Building Howard Community College Jason Fair Mechanical Technical Assignment #1 Ventilation Rate Procedure and Indoor Air Quality Procedure: The Ventilation Rate Procedure is required to maintain proper ventilation in spaces for the human occupants. Ventilation is responsible for maintaining proper oxygen levels within the building and make sure the carbon dioxide levels do not exceed set limits. The ventilation procedure is also responsible for maintaining proper distances between exhaust ducts and louvers and the outdoor air intake louvers. Indoor Air Quality is concerned with the contaminant levels within a building and providing proper dilution with fresh air to reduce the parts per million (ppm) contaminants in the air. This includes exhausting spaces where contaminants are present and pose a possible threat to the occupants. One such space that requires exhausting in my building is the kitchen. To maintain proper ventilation and IAQ the designers have chosen to exhaust all of the air that is supplied to the space. 10/5/2005 page 5/5
7 AHU #1 FLOOR ZONE # SPACE DESCRIPTION AREA (sqft) OCCUPANCY VENTILATION (cfm) CFM/SQFT SA (cfm) Zone Primary OA Fraction Zp * ASHRAE 62.1 Required OA Ventilation cfm/person cfm/ft 2 Total cfm 1st 1 Welcome Center Reception st 2 Call Center st 3 Shared Office & Storage st 4 Security Recept & ID office st 5 Director & Storage st 6 Elevator Lobby st 7 Atrium 2, , nd 8 shared Office # nd 9 Shared Office # nd 10 Dir & Assoc. Dir # nd 11 Aud. Conf Room nd 12 Assoc. Director nd 13 Assist. Director nd 14 Counseling #1& nd 15 Dir. & Counsel # nd 16 Conf. Room # , nd 17 Supervisor nd 18 Off. Support nd 19 Stor/file Rooms #1,2,3 1, nd 20 Financial Aid Reception nd 21 Cashier & Queing 1, , nd 22 Admin #2, Supervis & SH Office nd 23 Finance Recpt. & Support nd 24 Cash Handling nd 25 Admin #1 & Assoc. Dir # nd 26 AR/CR #1 &# nd 27 Assoc. Dir # nd 28 Elev. Lobby rd 29 Admin. Off #2,3,& rd 30 Admin. Off #5,6,& rd 31 Admin. Off #8& 9 &Assist Director rd 32 Admin. Off #10,11,& rd 33 Assist Dir # rd 34 Assist. Dir. #3 & Rec. Room rd 35 Assist Dir #4 & rd 36 Conf. Room # rd 37 Director & Storage rd 38 Assist. Dir. #7, & rd 39 Assist Dir #6 & Admin rd 40 Admin #13, 14, 15, 16, & Reception rd 41 Admin. # 17, 18, 19, 20 & reception rd 42 Office Support rd 43 Academic Support Reception rd 44 Library & Reception 1, , rd 45 Career Services & Computer Lab , rd 46 Admin # rd 47 Lobby rd 48 Elev. Lobby st 49&50 Office spaces 1, , ,2,3 51,52,&53 Toilet rooms 1, AHU #1 TOTALS 26, , , TOTAL 3248 * Ez = The zone air distribution effectiveness assumed to be 1.0 Ev Max Zp
8 AHU #2 FLOOR ZONE # SPACE DESCRIPTION AREA (sqft) OCCUPANCY VENTILATION (cfm) CFM/SQFT SA (cfm) Zone Primary OA Fraction Zp * ASHRAE 62.1 Required OA Ventilation cfm/person cfm/ft 2 Total cfm 2nd 1 Assist Dir # nd 2 Assist Dir #2 & nd 3 Records Special #1 & nd 4 Director nd 5 Records Reg. Reception 1, , nd 6 Conference nd 7 &7A Transfer Ctr Lab 2, , nd 8 Transfer Assist nd 9 Info Specialist nd 10 Dir. & Office Supervisor nd 11 Advising #10, 11, nd 12 Advising #7,8, nd 13 Advising #4,5, nd 14 Assoc. Dir #4 & 5 & Advising # nd 15 Assoc. Dir # nd 16 Assoc. Dir. #2 & Advising # nd 17 Assoc. Dir. #1 & Advising # nd 18 Transcript Eval #1 & nd 19 Records Storage nd 20 Office Support Area nd 21 Wait & Student Work Area nd 22 Admission & Advising Reception nd 23 Office Support & Transfer Rep nd 24 Office Supp. Stor. & Records nd 25 Office space rd 26 Assist. Dir#1,2, rd 27 Adap. Dss/Tech Lab rd 28 Queing rd 29 Conference Room # rd 30 &30A Testing Lab 1, , rd 31 Comp. Place Test Room , rd 32 Reception rd 33 Prometric Test Room rd 34 Reader/Writer Test Rooms rd 35 LAC Computer Lab 1, , rd 36 Lab Reception rd 37 LAC Write Lab rd 38 Small Tutor #3 & rd 39 Small Tutor #1 & rd 40 &40A Large Tutoring 2, , rd 41 LAC Reception rd 42 Office Supp & storage rd 43 Locker Area rd 44 Reception rd 45 Test Ctr. Coord & Off. Support rd 46 Admin. # rd 47 Admin. #2,3, AHU #2 TOTALS 24, , , TOTAL 4769 * Ez = The zone air distribution effectiveness assumed to be 1.0 Ev Max Zp
9 AHU #3 FLOOR ZONE # SPACE DESCRIPTION Zone ASHRAE 62.1 Required OA Primary OA Ventilation AREA (sqft) OCCUPANCY VENTILATION CFM/SQFT SA (cfm) Fraction Zp (cfm) * cfm/person cfm/ft 2 Total cfm 4th 1,1A &1B Large Dining 3, , , th 2A &2B Small Dining 1, , , th 3 Food Service Support th 4 Dining Lobby 1, , th 5 Elev. Lobby , th 6 Toilet Rooms AHU #3 TOTALS 7, , , TOTAL 3958 * Ez = The zone air distribution effectiveness assumed to be 1.0 Ev Max Zp
10 AHU #4 FLOOR ZONE # SPACE DESCRIPTION AREA (sqft) OCCUPANCY VENTILATION CFM/SQFT SA (cfm) (cfm) Zone Primary OA Fraction Zp * ASHRAE 62.1 Required OA Ventilation cfm/person cfm/ft 2 Total cfm 1st 1 Bookstore , st 1A Bookstore 1, , st 2 Cash Handling st 3 Director st 4 Assist. & Mgr st 5 &5A Reception & Work Area st 6 Office st 7 Storage 1, AHU #4 TOTALS 4, , , TOTAL 1315 * Ez = The zone air distribution effectiveness assumed to be 1.0 Ev Max Zp
11 AHU #5 FLOOR ZONE # SPACE DESCRIPTION AREA (sqft) OCCUPANCY VENTILATION CFM/SQFT SA (cfm) (cfm) Zone Primary OA Fraction Zp ASHRAE 62.1 Required OA Ventilation cfm/person cfm/ft 2 Total cfm 1st 1 &1A Dining 2, , , st 1B Dining , st 1C,1D,1E Dining 2, , , st 2A&2B Serving 2, , , st 3 Kitchen Office st 4 Corridor AHU #5 TOTALS 8, , , TOTAL 3371 * * Ez = The zone air distribution effectiveness assumed to be 1.0 Ev Max Zp
12 AHU #6 FLOOR ZONE # SPACE DESCRIPTION AREA (sqft) OCCUPANCY VENTILATION CFM/SQFT SA (cfm) (cfm) Zone Primary OA Fraction Zp * 1st 1 Kitchen 1, ,700-5, ASHRAE 62.1 Required OA Ventilation cfm/person cfm/ft 2 Total cfm AHU #6 TOTALS 1, , , * Ez = The zone air distribution effectiveness assumed to be 1.0 Note: AHU #6 is 100% outdoor air because all SA is exhausted thru kitchen hoods.
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