Presentation on theme: "ENERGY SAVING IN BASEMENT CAR PARK VENTILATION FOR"— Presentation transcript:
1 ENERGY SAVING IN BASEMENT CAR PARK VENTILATION FOR A PRESENTATION ONENERGY SAVINGINBASEMENT CAR PARK VENTILATIONFORTHE ADMINISTRATIVE BUILDING ATGREAMS ROAD , CHENNAI.
2 ADMIN BUILDING AT GREAMS ROAD, CHENNAI Proposed Hi-Tech Admn. Bldg Consists of 2 Towers- G+8 / G+5 and has a common lower and upper level BasementCapacity of Basement – Parking for 157 cars & 97 two-wheelers.Area of Basement (covers Towers 1&2)Lower Basement sq.mUpper Basement sq.mCeiling height of basements Mtr
3 Car Parking area in Basements are fully enclosed. Enclosed Under-ground parking area requires Mechanical Ventilation.In absence of Ventilation, Parking facility presents several Internal Air Quality problems.Most serious is the emission of high levels of Carbon-Monoxide(CO)CO is easily absorbed by Haemoglobin in Human Blood and can Inhibit Oxygen delivery to Body and can cause adverse health effects varying from headache to death
4 CO level- within 29mg/cu.m (25 ppm) with The NATIONAL BUILDING CODE OF INDIA – 2005 Specifies the following parameters for Ventilation:CO level- within 29mg/cu.m (25 ppm) withPeak level not to exceed 137 mg/cu.m.(125 ppm)As per ASHRAE Max Level for CO8 hrs exposure – 25ppm1 Hour exposure- 35 ppmAir change requirement as per NBC for Basement Car Parking :9 to 12 ACPH under normal conditions( For Design purpose 10 ACPH is used)30 ACPH in case of fire emergency
5 DUCTED VENTILATIONThe Conventional Ventilation System is the ducted Ventilation system. This has:-Provision of Fresh air fan and Exhaust Air Fans with ducting arrangement as per requirement.- To be operated based on timing control.- Full capacity of Fans has to be operated irrespective of Smoke level or CO Concentration.
6 DUCTLESS VENTILATIONThe Modern method of Ventilation system is the Ductless Ventilation system in which :- No Ducts are required.- Only Fresh Air Fans, Exhaust Air Fans and Jet Fansrequired.- CFD(Computational Fluid Dynamics) analysis, isutilised to decide the number and location of Jetfans foreffective and optimum performance.- A group of approximately 4 Nos of Jet Fans arecontrolled by one CO Sensor and Integrated with IBMS.- When the CO level exceeds threshold value, CO Sensors extends signal to IBMS and accordingly the corresponding group of Jet Fans are triggered.- When CO level exceeds threshold value in approximately 50% of CO Sensors per Basement , then Fresh Air/ Exhaust Fans are switched ON through IBMS along with jet fans
7 ADVANTAGES OF DUCTLESS VENTILATION No ducts: duct system and accessories are eliminated.Improved air quality and efficient OperationOptimum use of Car Park Space & Optimisation of Head room for Vehicles and Pedestrians.Flexibility in installation,quicker installationEffective smoke managementDuring Fire Conditions, the volume of air to be handled is of the order of 1.25 lakh CFM. Under this situation ductless system fares better compared to ducted system.
8 How energy saving is achieved in Ductless Ventilation? Ducts are associated with pressure drop,hence higher size F.A/E.F. are reqd.Jetfans are located using CFD Analysis in a manner that they help FA/EF to suck/exhaust air respectively, hence smaller size(HP) FA/EFreqd.During low traffic in Basement, depending upon CO level concentration, only a group of Jetfans may be switched ON by IBMS to distribute/ dilute CO concentration, while in ducted system higher capacity FA/EF have to be kept ON most of the time.
10 Construction / Characteristics of a Jet Fan 4423231551 - Casing made of Sheet Steel2- Special silencers at the inlet and outlet side3- Inlet cone(s)4- Protection guard(s)5- mounting brackets for ceiling suspensionSuitable for 300deg C operation for 1 hourSpeed : / rpm – Dual speedCFM : / 3800KW : / 1.5Sound level : / 71 dBArea Served by each Fan – 280 sq.mtr.(Approx)
12 Comparison between Ducted & Ductless system: Ducted systemOperating Cost :Assumption : All Fans Operation for 2 Hours (Peak Hour), for Balance 6 Hours (Lean Period) Half an Hour ON & Half an Hour OFF.So, Total operating time=5 hrs/day.Total unit consumption assuming 5hrs operation/day=134.7 KW x 5 hrs = KWH/day.Running cost per annum assuming Rs.7/- per unit rate= x 25 days X 12 months X Rs.7/-= Rs. 14,14,350/- per annum.
14 Comparison between Ducted & Ductless system: Operating cost :I.Peak 2 hrs - All jet fans, fresh/exhaust fans ON.a) Jet fans(32X0.3KW) =9.6 KWX2hrs = unitsb) Fresh air and exhaust fan =77.0 KW X 2hrs = unitsII. For balance 6 hrs (Fresh air & Exhaust fan OFF)a)25% (2 groups i.e. approx. 8 fans ) jet fans ONfor 2 hrs =9.6KWX25%x2hrs = unitsb)12.5% (1 group i.e. approx. 4 fans ) jet fans ONfor 2 hrs = 9.6KWX12.5%x2hrs= unitsc) For 2 hours (consisting of 4 durations of ½ hr. each)all Fans are OFF = Nil. Total units/day = unitsEnergy cost/annum = X 25 days X 12 months X Rs.7/ = Rs. 3,78,840.00Maintanence Cost for Jet fans p.a = Rs ,000.00Total Operating Cost per annum = Rs. 4,53,840.00
15 Calculation of Payback period Ducted Ductless1. Fresh air & Exhaust fans Rs lakhs Rs lakhs2. Ducting and electrical panel and cabling,cable tray,CO sensors. Rs lakh Rs lakhs3. Jet fans NIL Rs lakhsTotal cost Rs lakhs Rs lakhCapital cost for ducted System Rs lakhsCapital cost for ductless System Rs lakhsAdditional capital cost Rs lakhsSavings in Operating cost/ Annumby providing jet fans = Rs. (14,14,350/- - 4,53,840/-)= Rs. 9,60,510/- per annum.Pay back period = x 12 months9.60= monthsOr Say 24 months