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THANE MUNICIPAL CORPORATION
Thermal Storage in Commercial HVAC
A Case Study of Gadkari Rangayatan
THANE MUNICIPAL CORPORATION
Background
� Investment Grade Energy Audit of Gadkari Rangayatan
– by M/s Energetic Consulting Pvt. Ltd., Thane
– Major energy consuming equipments:
� Air-conditioning (74%) and Lighting (15%)
– Findings:
� Vintage of AC system was 30 Years and Sp. Energy consumption was
1.6 kW/TR
� High maintenance cost and frequent breakdowns
� No fresh air circulation in the auditorium
� Average CFM/person was 12; against 25 CFM/person as per ASHRAE
� No redundancy for Cooling Tower, and AHU
� No return air ducting at balcony level causing higher humidity levels
2
THANE MUNICIPAL CORPORATION
Recommendations
� Replacement of existing Reciprocating Chillers with Screw Chillers
� Replacement of R-11 Refrigerant with Eco-friendly R-407c
� Use of Thermal storage system for DSM
� Incorporate fresh air circulation for better comfort as per ASHRAE 62.1
� Change stage lighting with modern lighting such as Metal Halide
� Replace existing pumps with efficient pumps
� Create redundancy for AHU and for Cooling Tower
� Control Humidity for better comfort
THANE MUNICIPAL CORPORATION
Typical Demand CurveDemand V/S Time
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
160.00
180.00
Time
3
THANE MUNICIPAL CORPORATION
Typical Load Curve
THANE MUNICIPAL CORPORATION
Energy Scenario
The energy scenario was as under:
Contract Load (kW) : 250
Contract Demand (kVA) : 200
Average Power Factor : 1.00
Electrical Unit Consumed : 3.74 Lac kWh per annum
Total Energy Bill : Rs. 23 Lac per annum
Power Consumption pattern
Time
8 Hours
– 11
Hours
12 Hours
– 15.00
Hours
16.00
Hours -
19.30
Hours
20.30 Hours
- 24.00
Hours
Average Power,
kW109.10 88.05 147.20 101.64
kWh Distribution in RGR Auditorium
6%
9%
1%
67%
4%
4%
9%
Tube Lights Stage Lighting Fans Chillers, AHU and AC Cooling Tower Others Pump
4
THANE MUNICIPAL CORPORATION
Auditorium Temp & RH Profiles
Morning Session: Temperature Profile inside the auditorium
86%
88%
90%
92%
94%
96%
98%
100%
102%
15/4/2005
5/5/2005
15/5/2005
25/5/2005
5/6/2005
25/6/2005
25/6/2005
15/8/2005
15/4/2006
25/4/2006
5/5/2006
15/5/2006
25/5/2006
5/6/2006
15/8/2006
5/10/2006
15/10/2006
25/10/2006
5/11/2006
25/11/2006
5/12/2006
25/12/2006
5/2/2007
15/2/2007
25/2/2007
RH
Stage, 0C Dress Circle, 0C Balcony, 0C
Afternoon Session: Auditorium temperature profile
93%
94%
95%
96%
97%
98%
99%
100%
101%
5/4/2005
25/4/2005
15/5/2005
5/6/2005
25/6/2005
15/7/2005
15/8/2005
5/4/2006
15/5/2006
5/7/2006
5/8/2006
11/9/2006
15/10/2006
5/11/2006
25/11/2006
15/12/2006
5/1/2007
25/1/2007
15/2/2007
5/2/2007
Date
RH
Stage, 0C Dress Circle, 0C Balcony, 0CEvening Session: Temperature Profile inside the auditorium
91%
92%
93%
94%
95%
96%
97%
98%
99%
100%
101%
25/4/2005
5/5/2005
15/5/2005
5/6/2005
25/6/2005
15/7/2005
15/8/2005
5/4/2006
15/5/2006
15/6/2006
5/8/2006
25/8/2006
15/9/2006
5/10/2006
5/11/2006
25/11/2006
25/12/2006
15/1/2007
5/2/2007
5/2/2007
RH
Stage, 0C Dress Circle, 0C Balcony, 0C
THANE MUNICIPAL CORPORATION
Steps Taken
Tenders were drafted to include :
• Guaranteed specific energy consumption
• M & V Protocol to be verified every 6 months
• Comprehensive maintenance for next 5 years
• Minimum down-time
• Penalty for exceeding guaranteed sp. energy consumption
5
THANE MUNICIPAL CORPORATION
Performance at a Glance
Parameters Before After
Demand Recorded 165 kVA 134 kVA
Average Humidity 73 % 56 %
AC Load, TR/hr 48 72
Average Indoor Temp 27 deg C 22.3 deg C
Average Show hours/day 6.67 9.1
Average kWh / Show 175 79
THANE MUNICIPAL CORPORATION
Thermal storage system at Auditorium
� Screw Compressors
-- Efficiency 0.9 kW per Ton
� Demand side management
� Saving Rs. 1.5 Lac kWh per annum
� Annual Saving Rs. 14.2 Lac
Before After
6
THANE MUNICIPAL CORPORATION
Awards & Appreciations
First prize from MEDA in 2004
National Energy Conservation
Awards- 2005 “
from Ministry of Power,
Govt. of India
First prize from MEDA in 2006
Continuous excellence in 2007 from MEDA
THANE MUNICIPAL CORPORATION
Achievements
First Prize in National Energy Conservation Award- 2005 from Hon’ President of India in Government Building Sector
7
THANE MUNICIPAL CORPORATION
THANKING YOU
THANE MUNICIPAL CORPORATION
THANE
www.thanemahapalika.com