Energy Conservation, Management & Audit (ME-803 (B)) Notes

UNIT 3: ENERGY CONSERVATION, MANAGEMENT & AUDIT

I. FOUNDATIONAL CONCEPTS & POLICY FRAMEWORK

Energy Conservation vs. Energy Efficiency

Energy Conservation: Reducing energy consumption by altering behavior or eliminating wastage (e.g., switching off lights when not needed).
Energy Efficiency: Using less energy to perform the same task through technological improvement (e.g., replacing an incandescent bulb with an LED).

Example: Turning down a thermostat (conservation) vs. installing a high-efficiency HVAC system (efficiency).

Key Policies, Regulations & Market Mechanisms

Energy Conservation Act, 2001

Objective: Promote efficient use of energy and conservation.
Designated Consumers (DCs): Industries, commercial buildings, and other entities meeting specified energy consumption thresholds. They must:
- Appoint a certified Energy Manager.
- Conduct periodic energy audits.
- Implement energy conservation measures.
- Submit energy savings reports to the Bureau of Energy Efficiency (BEE).
Distribution of Power: Central Government (BEE for policy) & State Governments (State Designated Agencies for implementation).

Availability-Based Tariff (ABT)

Concept: A three-part tariff (capacity, energy, reactive energy) that incentivizes grid discipline and optimal power scheduling.
Components:
1. Scheduling: Day-ahead scheduling of generation/consumption.
2. Accounting: Daily accounting of deviations from schedule.
3. Settlement: Financial settlement based on deviation charges.
Working: Encourages consumers to match consumption with scheduled drawal, improving grid stability.

Renewable Purchase Obligation (RPO)

Definition: Mandatory requirement for specified entities (DISCOMs, captive users) to purchase a minimum percentage of their total electricity from renewable sources.
Regulatory Framework: Mandated by State Electricity Regulatory Commissions (SERCs) under the Electricity Act, 2003.
Means of Compliance:
- Direct purchase from renewable generators.
- Purchase of Renewable Energy Certificates (RECs) from the power exchange.
- Self-generation using renewable sources.

Core Energy Management Terminology

Energy Benchmarking: Comparing energy performance against a reference (e.g., industry average, best practice). Types: Internal (historical), External (peer/comparative).
Energy Cost: Total cost = Fixed charges (demand, service) + Variable charges (energy consumption, PF penalty/incentive, time-of-day rates).
Energy Performance: Measured via Specific Energy Consumption (SEC) or Energy Intensity (energy per unit of output).

II. ENERGY AUDIT PROCESS & METHODOLOGY

Types of Energy Audits

Preliminary Audit (Walk-through)	Detailed Audit (Comprehensive)
Quick, low-cost, visual inspection.	In-depth, data-intensive, 10-step methodology.
Identifies obvious savings & major areas.	Quantifies savings, detailed analysis, reports.
1-2 days, minimal instrumentation.	Weeks, extensive metering & monitoring.
Deliverable: List of potential measures & rough estimates.	Deliverable: Detailed report with calculations, specifications, ROI.

Ten-Step Methodology for Detailed Energy Audit

Organize & Plan: Form team, define scope, obtain management commitment.
Collect Data & Records: Past energy bills, process logs, equipment specs.
Conduct Plant Survey: Walk-through, identify major energy systems.
Detailed Measurement & Data Logging: Use instruments to measure actual consumption/performance.
Analyze Data & Calculate SEC: Compute energy use per unit of production.
Identify Energy Conservation Opportunities (ECOs): List all potential measures.
Technical Feasibility Study: Assess compatibility with process.
Economic Analysis: Calculate SPP, NPV, IRR for each ECO.
Report Preparation: Structured report with findings, recommendations, action plan.
Presentation & Follow-up: Present to management, plan implementation, monitor.

Audit Phases and Focus Areas

Pre-Audit Phase:
- Focus: Management support, data availability (bills, logs), major energy users (steam, compressed air, motors).
- Checklist: Objectives defined? Access granted? Key personnel identified? Safety protocols?
Audit Execution Phase:
- Techniques: Direct measurement, data logging, interviews, observation.
- Analysis: System-wise (boiler, HVAC, lighting) breakdown of energy use.
Post-Audit Phase:
- Report Format: Executive summary, methodology, findings (data tables), recommendations (with savings & cost), implementation plan.
- Presentation: Highlight quick wins, ROI, and long-term benefits to secure approval.

III. ENERGY AUDIT INSTRUMENTS & THEIR APPLICATIONS

Comprehensive List Categories: Electrical (power meter, PF meter), Thermal (IR thermometer, pyrometer), Flow (flow meter), Combustion (flue gas analyzer), Vibration (vibrometer), Light (lux meter).

Key Instruments in Detail

Infrared Thermometer / Thermal Imager

Principle: All objects emit IR radiation proportional to temperature. Detector converts IR to electrical signal.
Applications:
- Detect heat losses from building envelopes, pipes, equipment.
- Identify faulty electrical connections (hot spots).
- Check insulation continuity.
- Monitor process temperatures non-contact.

Tip: Emissivity setting is critical for accurate reading.

Stroboscope

Principle: Produces brief, high-intensity light flashes at adjustable frequency. When flash rate matches object rotation speed, object appears stationary.
Application: Non-contact speed measurement of rotating machinery (motors, fans, pumps, belts). Used to verify actual RPM vs. nameplate, check for slippage.

Other Key Instruments

Power Quality Analyzer: Measures voltage, current, harmonics, THD, transients. Diagnoses PF issues, harmonic distortion.
Flue Gas Analyzer: Measures O₂, CO, CO₂, flue gas temperature, excess air. Used for boiler combustion optimization.
Clamp-on Power Meter: Measures current (via CT clamp) and voltage to compute power (kW), energy (kWh), PF. Non-intrusive, used for quick audits of circuits/equipment.

IV. ENERGY CONSERVATION IN ELECTRICAL SYSTEMS

Energy Efficient Motors

Efficiency Classes (IEC 60034-30):
- IE1: Standard Efficiency.
- IE2: High Efficiency.
- IE3: Premium Efficiency (most common replacement standard).
- IE4: Super Premium Efficiency.
Motor Loading & Efficiency: Efficiency peaks at ~75-100% of rated load. Significant efficiency drop below 50% load due to constant core & friction losses.
Five Major Power Loss Areas & Improvement:

| Loss Area | Cause | Improvement Measures | | :--- | :--- | :--- | | Stator Loss (I²R) | Resistance of stator windings. | Use higher grade copper, increase conductor cross-section, improve winding technique. | | Rotor Loss (I²R) | Resistance of rotor bars/cage. | Use premium materials (copper bars), optimize bar design. | | Core Loss (Iron) | Hysteresis & eddy currents in core. | Use thinner, higher-grade silicon steel laminations, improve stacking. | | Friction & Windage | Bearing friction, air drag. | Use high-quality bearings, optimize fan design, improve aerodynamics. | | Stray Load Loss | Harmonic fluxes, non-uniform current distribution. | Optimize design, improve manufacturing precision. |

Power Factor Management

Effect of Low PF:
- Increases current for same real power → higher I²R losses in distribution.
- Reduces system capacity (transformers, cables).
- Electricity bill penalty (kVA demand billing) or reduced incentive.
Improvement Methods:
- Static Capacitor Banks: Most common. Installed at load or main bus.
- Synchronous Motors: Can operate at leading PF.
- Phase Advancers (for induction motors).
KVAR Calculation for PF Correction:

$$ \text{Required KVAR} = P \left( \tan \phi_1 - \tan \phi_2 \right) $$

Where \(P\) = Real Power (kW), \(\phi_1\) = initial PF angle, \(\phi_2\) = target PF angle.

\boxed{\text{KVAR} = P \left( \sqrt{\frac{1}{\cos^2\phi_1} - 1} - \sqrt{\frac{1}{\cos^2\phi_2} - 1} \right)}

Economic Benefit: Avoids penalty, may get incentive, reduces kVA demand charges, lowers losses.

Maximum Demand (MD) Management

Concept: Highest average power (kVA or kW) drawn over a demand interval (usually 15/30 min). Billed monthly based on contract demand or actual MD (whichever higher, subject to minimum).
Control Methods:
- Load Scheduling: Shift non-essential loads to off-peak.
- Use Soft Starters/VFDs: Reduce inrush current for motors.
- UPS Optimization: Ensure UPS is not unnecessarily loaded.
- Staggered Operation of high-power equipment.

Lighting Systems - Energy Management Opportunities (5+)

Lamp Replacement: Incandescent → CFL → LED (highest efficacy).
Ballast Upgrade: Magnetic ballast → Electronic ballast (20-30% saving).
Occupancy Sensors: Auto-switch off in unoccupied areas (restrooms, warehouses).
Daylight Harvesting: Use photo-sensors to dim/turn off lights near windows.
Task Lighting: Provide localized light instead of over-lighting entire space.
Regular Cleaning & Maintenance: Dust reduces light output significantly.
Zoning & Switching: Separate circuits for different areas/uses.

V. ENERGY CONSERVATION IN THERMAL SYSTEMS

Boiler Systems

Performance Metrics:
- Boiler Efficiency ($\eta$): $\eta = \frac{\text{Steam Energy Output}}{\text{Fuel Energy Input}} \times 100\%$. Direct/Indirect methods.
- Evaporation Ratio (ER): $ER = \frac{\text{Steam generated (kg)}}{\text{Fuel consumed (kg)}}$. Higher ER = better performance. Depends on fuel type & steam parameters.
Direct Testing Method (Input-Output Method):
- Procedure: Measure fuel consumption rate, steam generation rate, feedwater temperature & quality, flue gas temperature & composition.
- Flow:
  
  Fuel → Boiler → Steam Output & Flue Gas
  
  Measure: Fuel flow, steam flow, feedwater temp/analysis, flue gas temp/O₂.
- Efficiency Formula:

$$ \eta = \frac{m_s (h_s - h_f)}{m_f \cdot CV} \times 100\% $$

    Where \(m_s\) = steam flow, \(h_s\) = steam enthalpy, \(h_f\) = feedwater enthalpy, \(m_f\) = fuel flow, \(CV\) = fuel calorific value.

Steam Traps

Purpose: Discharge condensate & non-condensables while preventing live steam loss.
Types: Mechanical (ball/float), Thermostatic (bimetallic, bellows), Thermodynamic (disc).
Thermostatic Steam Trap (Bimetallic):
- Operation: Bimetallic strip expands with temperature. At steam temperature, strip bends to close valve. As condensate cools, strip contracts, opening valve to discharge condensate.
- Advantage: Good for modulating loads, resistant to water hammer.

Steam Turbines - Energy Conservation

Principles: Maintain high steam quality (dryness fraction), optimize inlet steam pressure/temperature, ensure proper vacuum in condenser.
Inefficiencies & Measures:
- Erosion/Corrosion: Use high-quality steam, proper water treatment.
- Leakages: Seal glands, valves.
- Poor Vacuum: Clean condenser tubes, ensure cooling water flow/temp.
- Throttling Losses: Use multi-stage extraction/induction turbines for process needs.

HVAC Systems

General Tips: Regular maintenance, clean coils/filters, optimize start/stop schedules, recover heat from exhaust, use economizer cycles.
Lower Evaporator Temperature Impact: For a given cooling load, lowering evaporator temperature increases compressor work (power) significantly due to reduced refrigerant density and increased pressure ratio.
3 Domestic AC Saving Measures:
1. Set thermostat at 24-26°C (each °C below saves ~6%).
2. Use ceiling fans to allow higher AC setting.
3. Ensure proper insulation of refrigerant pipes, clean filters monthly.

Thermal Insulation

Principle: Reduce heat transfer (conduction, convection, radiation) across a barrier using materials with low thermal conductivity (k-value).
Importance: Minimize heat loss/gain from pipes, vessels, buildings, furnaces → reduce fuel/electricity consumption.
5 Common Materials with Specs:

| Material | k-value (W/m·K) | Temp. Range (°C) | Notes | | :--- | :--- | :--- | :--- | | Mineral Wool | 0.03 - 0.04 | -50 to 650 | Fire resistant, good for pipes/boilers. | | Glass Wool | 0.032 - 0.044 | -50 to 450 | Lightweight, moisture sensitive. | | Calcium Silicate | 0.06 - 0.10 | Up to 650 | Rigid, used for high-temp pipe insulation. | | Expanded Polystyrene (EPS) | 0.033 - 0.040 | -50 to 95 | For buildings, cold storage. | | Ceramic Fibre | 0.08 - 0.15 | Up to 1260 | Very high temp, furnaces, kilns. |

Fluidized Bed Combustion (FBC)

Definition: Combustion process where solid fuel (coal, biomass) is suspended in an upward jet of air/combustion gases, behaving like a fluid.
Working Principle: Air velocity fluidizes the bed of inert material (sand, ash) and fuel. High mixing → uniform temperature (850-950°C) → efficient combustion, low NOx.
Applications: Power generation, industrial boilers, waste-to-energy.
Advantages over Conventional:
- Fuel flexibility (low-grade fuels, waste).
- In-bed SO₂ capture (with limestone).
- Lower NOx formation (lower combustion temp).
- Higher heat transfer coefficient.

Furnace & Process Heating

Cooling Water Calculation Example (from May 2023 paper):
- Given: $m_{shell} = 2000 \text{ kg}$, $C_{shell} = 0.2 \text{ kcal/(kg·°C)}$, $T_{initial}=90°C$, $T_{final}=55°C$, $T_{water,in}=28°C$, $\Delta T_{water}=5°C$.
- Heat to be removed: $Q = m_{shell} \cdot C_{shell} \cdot \Delta T = 2000 \times 0.2 \times (90-55) = 14,000 \text{ kcal}$.
- Water required: $m_{water} = \frac{Q}{C_{water} \cdot \Delta T_{water}} = \frac{14,000}{1 \times 5} = 2,800 \text{ kg}$.
\boxed{m_{\text{water}} = 2800 \text{ kg}}
Heat Loss Reduction:
- Insulate furnace walls, openings, doors.
- Use recuperators/preheaters for combustion air.
- Optimize excess air.
- Maintain proper burner tuning.

VI. RENEWABLE ENERGY & WASTE HEAT RECOVERY

Solar Water Heating Systems

Thermal Energy Enhancement Techniques:
1. Collector Design: Use evacuated tube collectors (low loss) or high-efficiency flat plates with selective coating.
2. Storage Optimization: Properly sized insulated storage tank, stratified storage.
3. Anti-Freeze & Drain-back: Protect system in cold climates.
4. Proper Orientation & Tilt: Maximize solar incidence (south-facing, tilt = latitude).
5. Regular Cleaning: Maintain transmissivity of glazing.

Heat Pumps

Basic Principle: Move heat from a low-temperature source to a high-temperature sink using external work (compressor). Reversible cycle.
Coefficient of Performance (COP):

$$ \text{COP}_{\text{Heating}} = \frac{\text{Heat Delivered}}{\text{Work Input}} > 1 $$

$$ \text{COP}_{\text{Cooling}} = \frac{\text{Heat Removed}}{\text{Work Input}} $$

Applications:
- Heating: Space heating, water heating (air/ground source).
- Cooling: Air conditioning, process cooling.
- Industrial: Heat recovery from low-grade waste streams.

Waste Heat Recovery Systems (WHRS)

Definition: Capture and utilize thermal energy from industrial processes that would otherwise be lost (flue gases, exhaust steam, hot surfaces).
Sources: Boiler flue gases, kiln exhaust, compressor intercoolers, engine jackets.
Benefits:
- Direct: Reduced fuel consumption, lower operating costs.
- Indirect: Reduced emissions, smaller equipment size, improved process control.
Common Technologies:
- Economizer: Preheats boiler feedwater using flue gas.
- Air Preheaters: Preheat combustion air.
- Heat Exchangers: Shell & tube, plate type for fluid streams.
- Organic Rankine Cycle (ORC): Generate power from low-temperature heat using organic fluid.

VII. TRANSPORTATION ENERGY CONSERVATION

Strategies & Technologies:
- Vehicle Technology: Hybrid/electric vehicles, lightweight materials, aerodynamic design.
- Alternative Fuels: CNG, LNG, biofuels, hydrogen, electricity.
- Fleet Management: Route optimization, load consolidation, telematics.
- Driver Training: Eco-driving (smooth acceleration/braking, optimal speed, idling reduction).
- Maintenance: Proper tire inflation, regular engine tune-up, low-viscosity oils.
Organizational Measures: Promote public transport/carpooling, videoconferencing to reduce travel.

VIII. FINANCIAL & ECONOMIC EVALUATION METHODS

Simple Payback Period (SPP)

Definition: Time required for cumulative savings to equal the initial investment.
Formula:

$$ \text{SPP} = \frac{\text{Initial Investment}}{\text{Annual Net Savings}} $$

\boxed{\text{SPP} = \frac{\text{Cost (Rs.)}}{\text{Annual Savings (Rs./year)}}}

Example (May 2023): Cost = ₹75 lakh, Annual O&M = ₹5 lakh, Annual Savings = ₹30 lakh.

Net Annual Savings = 30 - 5 = ₹25 lakh.

SPP = 75 / 25 = 3 years.
Advantages: Simple, easy to understand, indicates risk (shorter = less risk).
Limitations: Ignores time value of money, cash flows beyond payback, profitability.

Net Present Value (NPV)

Concept: Sum of all discounted future cash flows (savings - costs) over project life, minus initial investment. Considers time value of money.
Formula:

$$ \text{NPV} = \sum_{t=1}^{n} \frac{\text{Net Cash Flow}_t}{(1 + r)^t} - \text{Initial Investment} $$

Where \(r\) = discount rate (cost of capital), \(n\) = life.

Decision Rule: Accept if NPV > 0.
Comparison with SPP: NPV is more comprehensive (includes entire life, time value), but requires more data (discount rate, life). SPP is simpler, focuses on liquidity/risk.

CUSUM (Cumulative Sum) Analysis

Purpose: Monitor energy performance over time, detect small but persistent changes/inefficiencies.
5+ Steps:
1. Establish baseline energy consumption model (e.g., vs. production, weather).
2. Calculate expected energy use for each period (day/week) from baseline.
3. Compute difference: $C_i = (\text{Actual}_i - \text{Expected}_i)$.
4. Calculate cumulative sum: $S_n = \sum_{i=1}^{n} C_i$.
5. Plot $S_n$ vs. time. Trend indicates sustained performance change; step change indicates a permanent shift.
6. Investigate points where slope changes significantly.
Application: Identify process upsets, equipment degradation, or effectiveness of ECMs.

Sensitivity and Risk Analysis

Purpose: Assess how changes in key assumptions affect project economics (NPV, SPP). Identify critical variables and risks.
Key Parameters:
- Energy price escalation.
- Actual vs. projected savings.
- Equipment cost overruns.
- Equipment life/maintenance costs.
- Discount rate.
- Production volume changes.
Method: Vary one parameter at a time (sensitivity), or use probabilistic models (Monte Carlo) for risk.

Monitoring, Targeting and Reporting (MTR)

Rationale: Framework for continuous energy performance improvement.
Framework:
- Monitoring: Regular collection of energy & production data.
- Targeting: Set realistic, achievable energy reduction targets (e.g., % reduction in SEC).
- Reporting: Regular reports to management on performance vs. target, progress of ECMs.
Benefits: Creates accountability, tracks progress, identifies new opportunities, integrates energy into management culture.

IX. ENERGY MANAGEMENT TOOLS & SYSTEMS

Energy Management Information System (EMIS)

Definition: A suite of tools (hardware & software) for automated collection, storage, analysis, and reporting of energy data.
Components: Smart meters/sensors, data communication network, central database, analytics software, dashboards/reporting tools.
Role: Enables real-time monitoring, identifies anomalies, validates savings, supports CUSUM, drives data-driven decisions for continuous improvement.

Energy Policy Planning

What: Formal process to define an organization's energy vision, goals, and actions.
Key Elements in Energy Action Planning:
1. Policy Statement: Top management commitment.
2. Baseline Assessment: Current energy use & SEC.
3. Goals & Targets: Specific, measurable, time-bound (e.g., 10% reduction in SEC in 3 years).
4. Action Plans: List of ECMs, responsibilities, timelines, budgets.
5. Monitoring & Review: Mechanism to track progress and revise plans.

Force Field Analysis

Concept: Kurt Lewin's model to analyze forces driving change vs. restraining it.
Purpose: Plan change management for implementing energy conservation measures.
Steps:
1. Identify the desired change (e.g., implement VFDs).
2. List all driving forces (e.g., high energy costs, management support, available tech).
3. List all restraining forces (e.g., capital cost, operator resistance, downtime fear).
4. Score strength of each force (e.g., 1-5).
5. Develop strategy: Strengthen drivers (e.g., highlight ROI), weaken restrainers (e.g., training, pilot project).
6. Create action plan to shift balance toward change.

Sankey Diagram

Explanation: Flow diagram where arrow width is proportional to energy quantity. Shows inputs, useful outputs, and losses.
Example - Boiler Energy Balance:
- Input Arrow: 100% Fuel Energy (LHV).
- Output Arrows:
  - Steam Energy Output (e.g., 75% width) → Useful.
  - Flue Gas Loss (e.g., 12% width) → Loss.
  - Radiation/Convection Loss (e.g., 5% width) → Loss.
  - Incomplete Combustion (e.g., 8% width) → Loss.
- Use: Instantly visualize major loss sources, prioritize improvement areas.

Pump System Characteristics

Pump Head-Flow Curve: Graph of Head (H) vs. Flow (Q). Head decreases as flow increases.
System Resistance Curve: Graph of Total Dynamic Head (TDH) required by the system vs. Flow. TDH = Static Head + Friction Head Loss (∝ Q²).
Intersection Point: Operating point where pump curve meets system curve.
Best Efficiency Point (BEP): Point on pump curve of maximum efficiency. System Mismatch: If system curve forces operation far from BEP (e.g., throttling), efficiency drops significantly.

DiagramCANVAS: Sketch showing two curves: Pump H-Q curve (downward sloping) and System Resistance Curve (upward parabolic). Label intersection as Operating Point. Mark BEP on pump curve. Show how throttling moves operating point left/right away from BEP.

X. CALCULATIONS, ANALYSIS & PROBLEM-SOLVING

Material and Energy Balances

Steady-State Material Balance (No accumulation):

\[ \text{Input} = \text{Output} + \text{Generation} - \text{Consumption} \]

For mixing problems without reaction:

\[ \sum (\text{Mass Flow}_\text{in} \times \text{Concentration}_\text{in}) = \sum (\text{Mass Flow}_\text{out} \times \text{Concentration}_\text{out}) \]

Example (June 2025): Mix 10% solids (5 kg/s) with x kg/s of 25% solids to get 20% solids output.

Let $x$ = flow of 25% solution.

Solids balance: $0.10 \times 5 + 0.25 \times x = 0.20 \times (5 + x)$

$0.5 + 0.25x = 1 + 0.20x$

$0.05x = 0.5 \Rightarrow x = 10 \text{ kg/s}$.

\boxed{\text{Flow of 25% solution} = 10 \text{ kg/s}}

Heat Transfer Calculations

Furnace Shell Cooling (Example from June 2025):
- $Q = m_{shell} C_{shell} \Delta T$ (Heat to be removed).
- $m_{water} = \frac{Q}{C_{water} \Delta T_{water}}$ (Assuming no loss, all heat absorbed by water).
- Given: $m=2000\text{kg}$, $C=0.2\text{kcal/kg°C}$, $\Delta T_{shell}=35°C$, $C_{water}=1\text{kcal/kg°C}$, $\Delta T_{water}=5°C$.
- $Q = 2000 \times 0.2 \times 35 = 14,000 \text{ kcal}$.
- $m_{water} = 14,000 / (1 \times 5) = 2,800 \text{ kg}$.
\boxed{m_{\text{water}} = 2800 \text{ kg}}

Electrical System Calculations

Power Factor Correction:
- Initial: $P, \cos\phi_1$ → $Q_1 = P \tan\phi_1$.
- Target: $\cos\phi_2$ → $Q_2 = P \tan\phi_2$.
- Required KVAR = $Q_1 - Q_2$.
Maximum Demand & Incentive Calculation (May 2023 complex problem):
1. Contract Demand (CD) = 5000 kVA.
2. Avg. MD = 3850 kVA at PF 0.95.
3. Minimum Billable MD = 75% of CD = 3750 kVA. Since 3850 > 3750, MD billed = 3850 kVA.
4. MD Charge = ₹500/kVA/month → Annual MD cost = $3850 \times 500 \times 12$.
5. PF Improvement to 1.0:
  - Initial $Q_1 = P \tan\phi_1$. $P = \text{Avg. MD} \times \cos\phi_1 = 3850 \times 0.95 = 3657.5 \text{ kW}$.
  - $\tan\phi_1 = \tan(\cos^{-1}0.95) \approx 0.329$.
  - $Q_1 = 3657.5 \times 0.329 \approx 1203 \text{ kVAR}$.
  - At unity PF, $Q_2 = 0$.
  - KVAR required = 1203 kVAR.
6. Energy Charge Incentive: 0.5% reduction for every 0.01 increase over 0.95.
  - Increase from 0.95 to 1.0 = 0.05 → 5 steps of 0.01.
  - Total incentive = 5 × 0.5% = 2.5% on energy charge.
  - Avg. monthly energy charge = ₹20 lakh → Annual = ₹240 lakh.
  - Annual saving on energy charge = 2.5% of 240 lakh = ₹6 lakh.
7. MD Charge Saving? MD is based on kVA. Improving PF from 0.95 to 1.0 reduces kVA demand for same kW.
  - New MD (kVA) = $P / \cos\phi_2 = 3657.5 / 1 = 3657.5 \text{ kVA}$.
  - Old MD billed = 3850 kVA.
  - New MD billed = max(3657.5, 3750) = 3750 kVA (since 3657.5 < 3750 min billable).
  - No saving in MD charge because new kVA (3657.5) is below minimum billable (3750 kVA). MD billed remains 3750 kVA? Wait: Actual MD is 3850 kVA at PF 0.95. After correction, for same real power (3657.5 kW), kVA = 3657.5. But the maximum demand recorded is the highest kVA drawn. If PF correction is done, the kVA meter reading for same kW load will be lower. So new recorded MD will be lower. But minimum billable is 75% of CD = 3750 kVA. Since 3657.5 < 3750, utility will bill 3750 kVA. Previously billed 3850 kVA. So MD billed reduces from 3850 to 3750 kVA.
  - Annual saving on MD charge = (3850 - 3750) × 500 × 12 = 100 × 500 × 12 = ₹6 lakh.
8. Total Annual Saving = Energy saving (6) + MD saving (6) = ₹12 lakh.

XI. ROLE OF ENERGY MANAGER & ORGANIZATIONAL ASPECTS

Duties, Responsibilities & Qualifications (As per EC Act)

Duties:
- Ensure compliance with EC Act provisions.
- Conduct periodic energy audits.
- Prepare and submit energy conservation reports.
- Recommend ECMs and monitor implementation.
- Promote awareness and training.
Responsibilities: Accountable for energy performance of the designated consumer.
Qualifications: Graduate in engineering/architecture + 3 years experience OR postgraduate in engineering/management + 2 years experience. Must pass Energy Manager Certification Exam by BEE.

Building Energy Management

Strategies:
- HVAC Optimization: Zoning, VAV systems, economizers, night purge.
- Lighting: LED retrofit, daylight harvesting, occupancy sensors.
- Envelope: Insulation, high-performance glazing, sealing leaks.
- Plug Loads: Energy Star equipment, smart power strips.
- Controls: Building Management System (BMS) for integrated control.
- Renewables: Rooftop solar PV, solar water heating.

Energy Management in Industry

Integration: Link with production planning, maintenance schedules, quality control.
Organizational Structure:
- Top Management: Policy & resources.
- Energy Manager: Coordination & reporting.
- Energy Team: Representatives from production, maintenance, engineering.
- Operators: Daily monitoring & operation.
Key: Energy management as a line function, not just staff function. Integrate energy KPAs into performance reviews.