Energy Conservation, Management & Audit (ME-803 (B)) - Unit 5 Short Notes

1. Energy Policy, Regulations, and Market Mechanisms

Availability-Based Tariff (ABT)

A three-part tariff mechanism introduced by CERC to ensure grid stability and encourage efficient generation.

• Components:

  1. Capacity Charge – Fixed cost recovery for committed capacity.

  2. Energy Charge – Variable cost based on actual energy (kWh) supplied.

  3. Reactive Energy Charge – Incentive/penalty for maintaining power factor.

• Significance:

  • Promotes merit-order dispatch.

  • Discourages overdrawal by generators.

  • Enhances grid discipline through Unscheduled Interchange (UI) charges.

[!TIP]

ABT links payment to actual grid support; generators are penalized for deviation from scheduled dispatch.

Renewable Purchase Obligation (RPO)

Mandates Distribution Licensees/consumers to procure a minimum percentage of power from renewable sources.

• Types:

  • Solar RPO – Specific share from solar projects.

  • Non-Solar RPO – From wind, biomass, etc.

• Compliance Mechanisms:

  1. Direct Purchase – Buying renewable power via PPAs.

  2. Renewable Energy Certificates (RECs) – Tradable certificates (1 REC = 1000 kWh) for shortfall/surplus.

Energy Conservation Act, 2001

Legislative framework for energy efficiency in India.

• Key Highlights:

  • Designation of Designated Consumers (energy-intensive industries, railways, etc.).

  • Mandatory appointment of Energy Managers (certified by BEE).

  • Energy Audit compliance for designated consumers.

• Focus Areas:

  • Industrial sector, commercial buildings, transport.

• Provisions for Power Distribution:

  • BEE prescribes energy consumption norms for designated consumers.

  • Penalties for non-compliance.

Fundamental Concepts

• Energy Benchmarking: Comparing energy performance against industry best practices or standards (e.g., SEC – Specific Energy Consumption).

• Energy Cost Components:

  • Fixed Charges (demand, capacity).

  • Variable Charges (energy consumption, fuel surcharge).

• Energy Performance Indicators (EnPIs): Metrics like kWh/tonne of product, kWh/m² floor area.

2. Energy Management Systems and Planning

Energy Conservation vs. Energy Efficiency

Energy Policy Planning & Energy Action Planning

• Process:

  1. Energy Review – Collect data, identify major uses.

  2. Set Objectives & Targets – Align with corporate policy.

  3. Action Plans – Assign responsibilities, budgets, timelines.

  4. Implementation & Monitoring.

• Key Elements of Energy Action Planning:

  • Baseline energy assessment.

  • SMART targets (Specific, Measurable, Achievable, Relevant, Time-bound).

  • Identification of Energy Conservation Measures (ECMs).

  • Resource allocation and review schedule.

Role of Energy Managers

• Duties: Conduct energy audits, monitor consumption, implement ECMs.

• Responsibilities: Ensure compliance with EC Act, train staff, report to management.

• Qualifications: Certified Energy Manager (CEM) from BEE, technical background.

Energy Management Information System (EMIS)

• Purpose: Real-time monitoring, analysis, and reporting of energy data.

• Components:

  • Data Acquisition – Smart meters, sensors.

  • Communication Network – SCADA, IoT.

  • Software Platform – Data storage, analytics, dashboards.

  • Reporting Module – Alerts, KPIs, trend analysis.

• Benefits: Quick anomaly detection, data-driven decisions, performance tracking.

Monitoring, Targeting, and Reporting (MTR)

• Rationale: Continuous improvement cycle for energy performance.

• Steps:

  1. Monitor – Collect energy data (sub-metering).

  2. Set Targets – Based on benchmarks or historical data.

  3. Report – Regular performance reports to stakeholders.

• Benefits: Accountability, motivation, early leak detection.

Force Field Analysis

• Concept: Analyze driving forces (promoting change) vs. restraining forces (resisting change) for an energy project.

• Application:

  • Identify key forces (e.g., management support vs. capital constraints).

  • Strengthen drivers, weaken restraints to ensure project success.

Data and Information Analysis

• Methods:

  • Trend Analysis – Plot monthly consumption to spot anomalies.

  • Benchmarking – Compare with similar facilities.

  • Regression Analysis – Relate energy use to production variables.

  • CUSUM – Detect small persistent shifts in performance.

Building Energy Management (BEM)

• Strategies:

  • HVAC optimization (set points, zoning).

  • Lighting controls (occupancy sensors, daylight harvesting).

  • Building envelope improvements (insulation, glazing).

• Systems: Building Management System (BMS), energy dashboards.

3. Energy Audit Methodology

Preliminary vs. Detailed Energy Audit

Ten-Step Methodology for Detailed Energy Audit

1. Planning & Organizing – Define scope, team, schedule.

2. Pre-Audit Data Collection – Historical energy bills, process data.

3. Site Survey & Measurement – Walk-through, instrument deployment.

4. Material & Energy Balance – Quantify inputs/outputs.

5. Loss Identification – Pinpoint inefficiencies (thermal, electrical).

6. Data Analysis – Interpret measurements, calculate savings potential.

7. ECM Identification – List conservation measures.

8. Technical Feasibility – Assess compatibility with existing systems.

9. Economic Analysis – Calculate payback, NPV for each ECM.

10. Reporting – Prepare audit report with recommendations.

Pre-Audit Phase Focus Areas

• Collect energy bills (electricity, fuel) for 1–3 years.

• Understand process flow diagrams and equipment inventory.

• Identify major energy-consuming areas.

• Interview plant personnel for operational insights.

• Prepare audit plan and instrument checklist.

Energy Audit Instruments

Sankey Diagram

• Construction: Arrows represent energy flows; width proportional to energy magnitude.

• Interpretation: Visually identifies major losses (e.g., flue gas, radiation).

• Example: Boiler energy input (fuel) → useful steam (output) + losses (stack, radiation, blowdown).

[!TIP]

Sankey diagrams are essential for material/energy balance visualization in audit reports.

CUSUM Analysis

• Steps:

  1. Calculate difference \( d_i = \text{Actual}_i - \text{Expected}_i \) for each period.

  2. Cumulative sum \( C_i = C_{i-1} + d_i \).

  3. Plot \( C_i \) vs. time; shifts indicate performance change.

• Application: Detect gradual efficiency drop in boilers, motors.

Material and Energy Balance

• Principles:

  • Mass Balance: \( \text{Input} = \text{Output} + \text{Accumulation} \) (steady-state: accumulation = 0).

  • Energy Balance: \( \text{Energy In} = \text{Energy Out} + \text{Losses} \).

• Problem-Solving Approach:

  1. Define system boundary.

  2. List all inputs/outputs with unknown rates.

  3. Apply conservation laws.

  4. Solve simultaneous equations.

4. Technical Energy Conservation in Industrial Systems

4.1 Electrical Systems

Energy-Efficient Motors

• IE Standards (IEC 60034-30): IE1 (standard), IE2 (high), IE3 (premium), IE4 (super premium).

• Power Loss Areas:

  | Loss Type | Cause | Improvement Measures | |---------------------|------------------------------------|---------------------------------------------| | Stator Loss | Copper resistance in windings. | Use higher-grade copper, optimize slot design. | | Rotor Loss | Copper resistance in rotor bars. | Use better conductivity material (copper). | | Core Loss | Hysteresis & eddy currents in core. | Use thin, high-grade silicon steel laminations. | | Friction & Windage | Bearing friction, air drag. | High-quality bearings, optimized fan design. | | Stray Load Loss | Harmonic fluxes, manufacturing imperfections. | Precision manufacturing, optimized design. |

Motor Loading

• Effect of Under-Loading: Efficiency drops sharply below 50% load due to constant iron losses.

• Improvement Steps:

  1. Right-Sizing – Replace oversized motors with appropriately sized ones.

  2. Variable Frequency Drives (VFDs) – Match speed/load, especially for variable torque loads (fans, pumps).

Power Factor

• Effects of Low PF: Increased current → higher losses, reduced transformer capacity, penalty charges.

• Improvement: Install capacitor banks (shunt or series).

• KVAR Calculation (for PF correction from \( \cos \phi_1 \) to \( \cos \phi_2 \)):

  \[ Q = P \left( \tan \phi_1 - \tan \phi_2 \right) \]

  where \( P \) = real power (kW).

Maximum Demand

• Concept: Highest average load (kVA/kW) over a demand interval (usually 15–30 min).

• Billing Implication: Charged per kVA of maximum demand (often with 75% minimum contract demand clause).

• Control Strategies:

  • Load Shifting – Move non-essential loads to off-peak.

  • Soft Starters – Reduce inrush current, flatten demand peaks.

Lighting Systems

• Conservation Opportunities:

  1. LED Retrofits – Replace fluorescent/MH with LEDs (50–70% savings).

  2. Occupancy Sensors – Auto on/off in unoccupied zones.

  3. Daylight Harvesting – Dim lights near windows.

  4. Regular Cleaning – Maintain luminaire efficiency.

  5. Task Lighting – Provide localized light instead of area lighting.

4.2 Thermal Systems

Boilers

• Direct Testing Method:

  DiagramCANVAS: Schematic showing fuel input → boiler → steam output, with measurement points for fuel flow, steam flow/pressure/temperature, flue gas temp/O₂, ambient conditions. Flow chart: Input data → efficiency calculation → loss analysis.

• Efficiency vs. Evaporation Ratio:

  • Efficiency = (Heat utilized for steam / Heat input from fuel) × 100%.

  • Evaporation Ratio = kg of steam generated / kg of fuel consumed.

  • Higher evaporation ratio implies better efficiency (for same fuel quality).

Steam Systems

• Steam Traps: Automatic valves that discharge condensate while blocking steam.

  • Types: Thermostatic (temperature-sensitive), Mechanical (float/thermodynamic), Thermodynamic (disc).

• Thermostatic Steam Trap Operation:

  • Uses a bellows or bimetal element filled with temperature-sensitive fluid.

  • Opens when condensate temperature is below saturation (cool), closes when steam arrives (hot).

Steam Turbines

• Conservation Techniques:

  1. Nozzle Optimization – Aerodynamic design to reduce friction losses.

  2. Insulation – Reduce heat loss from casing and pipelines.

  3. Exhaust Management – Use back-pressure turbines for process steam, avoid throttling.

  4. Regular Maintenance – Blade cleaning, bearing alignment.

Thermal Insulation

• Principles: Reduce heat transfer by conduction (insulating material), convection (sealing air gaps), radiation (reflective surfaces).

• Properties:

  • Thermal Conductivity (k-value) – Lower is better (W/m·K).

  • Temperature Range – Material must withstand operating temperature.

• Five Materials with Specifications:

  | Material | k-value (W/m·K) | Max Temp (°C) | |-----------------------|---------------------|-------------------| | Mineral Wool | 0.03–0.04 | 450–600 | | Calcium Silicate | 0.06–0.08 | 650 | | Ceramic Fiber | 0.10–0.15 | 1000–1400 | | Expanded Polystyrene | 0.03–0.04 | 75 | | Glass Wool | 0.03–0.04 | 300–450 |

Furnace Cooling

• Heat Balance Calculation:

  \[ Q = m \cdot c \cdot \Delta T \]

  where \( m \) = mass of furnace shell (kg), \( c \) = specific heat (kcal/kg·°C), \( \Delta T \) = temperature drop (°C).

  Water required: \( m_w = \frac{Q}{c_w \cdot \Delta T_w} \), with \( c_w = 1 \) kcal/kg·°C.

Fluidized Bed Combustion (FBC)

• Definition: Combustion where fuel particles are suspended in a turbulent air stream (fluidized).

• Types:

  • Bubbling FBC (BFBC) – Air velocity creates bubbles, lower temperature (850–950°C).

  • Circulating FBC (CFBC) – Higher velocity, particles circulated, better heat transfer.

• Applications:

  • Boilers for diverse fuels (coal, biomass, waste).

  • Low NOₓ emission, sulfur capture with limestone.

4.3 HVAC and Refrigeration

HVAC Conservation Tips

1. Set Point Optimization – Raise cooling set point by 1–2°C (5–10% savings).

2. Regular Maintenance – Clean coils, filters, check refrigerant charge.

3. Zoning – Control different areas separately.

4. Heat Recovery – Use exhaust air to pre-heat/cool incoming fresh air.

5. Economizer Cycle – Use outdoor air for cooling when favorable.

Heat Pumps

• Working Principle: Vapor-compression cycle; moves heat from low-temperature source to high-temperature sink.

• COP (Coefficient of Performance):

  \[ \text{COP} = \frac{\text{Useful Heat Output (kWh)}}{\text{Electrical Input (kWh)}} \]

  Typical COP: 3–5 for heating, 2.5–4 for cooling.

• Applications: Space heating, water heating, industrial drying.

Air Conditioning

• Lower Evaporator Temperature Effect:

  • Reduces refrigerant pressure → increases compressor work → higher power consumption.

• Domestic Saving Measures:

  1. Clean/replace filters monthly.

  2. Set thermostat at 24–26°C.

  3. Ensure proper ventilation (avoid sealed room).

  4. Use ceiling fans to reduce cooling load.

  5. Shade outdoor unit.

4.4 Renewable and Waste Energy Utilization

Solar Water Heaters

• Thermal Enhancement Techniques:

  1. Selective Coating – High absorptivity, low emissivity on absorber plate.

  2. Vacuum Tubes – Reduce convective losses (evacuated tube collectors).

  3. Tracking Systems – Follow sun to increase incident radiation.

  4. Insulation – Minimize heat loss from storage tank/piping.

Waste Heat Recovery

• Direct Benefits: Reduced fuel consumption, lower emissions.

• Indirect Benefits: Reduced equipment size, improved process control.

• Recovery Methods:

  • Economizer – Preheat boiler feedwater using flue gas.

  • Regenerative – Store heat in a medium (e.g., ceramic) for cyclic use.

  • Heat Exchanger – Transfer heat from hot to cold streams (shell-and-tube, plate).

4.5 Transportation

• Energy Conservation Measures:

  • Modal Shift – Shift from road to rail/water for freight.

  • Vehicle Efficiency – Use fuel-efficient models, maintain tires/engines.

  • Route Optimization – Software for shortest/fuel-efficient routes.

  • Fleet Management – GPS tracking, load consolidation, driver training.

4.6 Fluid Systems

Pump Head-Flow Characteristics

• Pump Curve: Head (H) decreases as flow (Q) increases (typically parabolic).

• System Resistance Curve: \( H_{\text{sys}} = H_{\text{static}} + K Q^2 \) (friction losses ∝ \( Q^2 \)).

• Best Efficiency Point (BEP): Intersection of pump curve and system curve where efficiency is maximum.

• Sketch Explanation:

  DiagramCANVAS: Graph with Head (m) on Y-axis, Flow (m³/s) on X-axis. Plot downward-sloping pump curve and upward-parabolic system curve. Mark intersection as BEP. Show left/right of BEP: overloading/underloading reduces efficiency.

[!TIP]

Operating far from BEP causes cavitation, vibration, and reduced pump life. Use VFDs to match system demand.

5. Financial and Economic Analysis for Energy Projects

Simple Payback Period (SPP)

• Definition: Time required to recover initial investment from annual savings.

• Formula:

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

• Example: Investment = Rs. 10 lakh, annual savings = Rs. 2 lakh → SPP = 5 years.

  \boxed{\text{SPP} = \frac{\text{Investment}}{\text{Annual Savings}}}

Net Present Value (NPV)

• Importance: Considers time value of money; compares cash flows over project life.

• Formula:

  \[ \text{NPV} = \sum_{t=0}^{n} \frac{C_t}{(1 + r)^t} \]

  where \( C_t \) = net cash flow at year \( t \), \( r \) = discount rate, \( n \) = project life.

• Decision Rule: Accept if NPV > 0.

Payback vs. NPV

Sensitivity and Risk Analysis

• Concept: Test how changes in key parameters (savings, costs, discount rate) affect NPV/SPP.

• Parameters Variation:

  • Increase fuel cost → higher savings → better NPV.

  • Lower equipment life → reduced total savings.

• Impact: Identify critical variables; prepare contingency plans.

Quantitative Problem-Solving

• Material Balance Example (from past paper):

  A solution containing 10% solids is mixed with 25% solid solution. A single output which is 20% solid is removed. If the 10% solution enters at 5 kg/s, what are the other rates? (Assume no accumulation)

  Solution:

  Let \( x \) = flow rate of 25% solution (kg/s), \( y \) = output flow (kg/s).

  Mass balance: \( 5 + x = y \)

  Solids balance: \( 0.1 \times 5 + 0.25x = 0.2y \)

  Solve: \( 0.5 + 0.25x = 0.2(5 + x) = 1 + 0.2x \) → \( 0.05x = 0.5 \) → \( x = 10 \) kg/s, \( y = 15 \) kg/s.

• Furnace Cooling Example:

  Furnace shell (2 tonnes, c = 0.2 kcal/kg·°C) cooled from 90°C to 55°C. Water at 28°C, ΔT_w max = 5°C. Calculate water required.

  Solution:

  Heat to remove: \( Q = m \cdot c \cdot \Delta T = 2000 \times 0.2 \times (90 - 55) = 14,000 \) kcal.

  Water needed: \( m_w = \frac{Q}{c_w \cdot \Delta T_w} = \frac{14,000}{1 \times 5} = 2800 \) kg.

6. General Management and Organizational Concepts

6.1 Systems Thinking

System and Its Elements

• System: Set of interrelated components working together to achieve an objective.

• Elements:

  • Input – Resources entering the system.

  • Process – Transformation activities.

  • Output – Results/products.

  • Feedback – Information to control/improve.

  • Environment – External factors affecting the system.

Steven Alter’s Nine-Element Work System Framework

Components:

1. Customers – Recipients of outputs.

2. Products/Services – What is produced.

3. Processes – Activities to create outputs.

4. Participants – People involved.

5. Information – Data used/created.

6. Technologies – Tools and infrastructure.

7. Management – Planning, organizing, controlling.

8. Environment – External context (legal, economic).

9. Infrastructure – Supporting facilities.

IPO Model

• Input-Process-Output: Simplified system view.

• Comparison with Alter’s Model:

  • IPO is linear, focuses on transformation.

  • Alter’s model is holistic, includes customers, environment, management.

6.2 Behavioral and Motivational Theories

Maslow’s Need Hierarchy Theory

Levels (ascending):

1. Physiological – Food, shelter.

2. Safety – Job security, safety.

3. Social – Belonging, relationships.

4. Esteem – Recognition, status.

5. Self-Actualization – Realizing potential.

• Example: A worker may seek higher pay (safety) before promotion (esteem).

Herzberg Two-Factor Theory

• Motivators (satisfy growth): Achievement, recognition, responsibility → increase satisfaction.

• Hygiene Factors (prevent dissatisfaction): Salary, job security, working conditions → absence causes dissatisfaction, presence only neutral.

Stress Management

• Methods:

  • Time Management – Prioritize tasks, avoid procrastination.

  • Relaxation Techniques – Meditation, deep breathing.

  • Counseling – Professional help for chronic stress.

  • Physical Activity – Exercise, sports.

6.3 Strategic Management Tools

SWOT Analysis

• Components:

  • Strengths – Internal advantages (e.g., skilled workforce).

  • Weaknesses – Internal limitations (e.g., old machinery).

  • Opportunities – External favorable trends (e.g., government subsidies).

  • Threats – External challenges (e.g., rising fuel costs).

• Construction: List factors under each quadrant; match strengths to opportunities, weaknesses to threats.

BCG Matrix

• Stars – High growth, high market share (invest).

• Cash Cows – Low growth, high share (milk for cash).

• Question Marks – High growth, low share (selective investment).

• Dogs – Low growth, low share (divest).

• Application: Portfolio analysis of business units/products.

Break-Even Point (BEP)

• Concept: Sales volume where total revenue = total cost (no profit/loss).

• Formula (units):

  \[ \text{BEP} = \frac{\text{Fixed Costs}}{\text{Contribution per unit}} = \frac{F}{P - V} \]

  where \( P \) = selling price/unit, \( V \) = variable cost/unit.

• Interpretation: Below BEP → loss; above → profit.

Financial Ratio Analysis

Operating and Financial Leverage

• Operating Leverage: Use of fixed operating costs; magnifies profit changes with sales volume.

  \[ \text{Degree of Operating Leverage (DOL)} = \frac{\text{Contribution}}{\text{EBIT}} \]

• Financial Leverage: Use of debt; magnifies EPS changes with EBIT.

  \[ \text{Degree of Financial Leverage (DFL)} = \frac{\text{EBIT}}{\text{EBT}} \]

Fund Flow vs. Cash Flow Statement

6.4 Decision Making and Problem Solving

Steps in Decision Making

1. Problem Identification – Define the issue clearly.

2. Alternative Generation – Brainstorm possible solutions.

3. Evaluation – Assess alternatives (cost, risk, feasibility).

4. Selection – Choose best alternative.

5. Implementation – Execute decision.

6. Review – Monitor outcomes, feedback.

Linear Programming

• Formulation: Maximize/minimize objective function subject to constraints.

• Example (Product Mix):

  Maximize \( Z = 3P + 5Q \) (profit)

  Subject to:

  \( 2P + 4Q \leq 20000 \) (time constraint)

  \( P + Q \leq 1500 \) (material)

  \( Q \leq 600 \) (electric switch)

  \( P, Q \geq 0 \)

• Solution: Graphical or simplex method.

Law of Requisite Variety

• Principle: For a system to be effectively controlled, the controller must have a variety of responses at least equal to the variety of disturbances.

• Application: In management, need flexible policies to handle diverse market/operational uncertainties.

6.5 Entrepreneurship and Business Development

Business Ownership

Sources of Funds and Funding Agencies

• Internal: Retained earnings, sale of assets.

• External:

  • Banks – Term loans, working capital.

  • Venture Capital – High-growth startups.

  • Government Schemes – CGTMSE, Stand-Up India, MSME subsidies.

MSMEs and Entrepreneur Development Programs (EDPs)

• Role of MSMEs: Employment generation, regional development, innovation.

• EDPs in India:

  • EDII (Ahmedabad) – Training, incubation.

  • NIESBUD – Entrepreneurship development.

  • State-level ED cells – Skill development, funding assistance.

Manufacturing Systems

• Just-In-Time (JIT): Produce only what is needed, when needed, in the amount needed → minimize inventory, waste.

Operations and Productivity

• Relationship: Productivity = Output / Input (e.g., units/labour hour). Higher productivity → lower cost, higher profit.

• Improvement: Technology upgrade, training, process optimization.

Allowances

• Necessity: Account for unavoidable delays (fatigue, personal, unavoidable).

• Types:

  • Fatigue Allowance – Rest from physical/mental strain.

  • Personal Allowance – Breaks for personal needs.

  • Delay Allowance – Unavoidable machine/process delays.

Six Sigma

• Use in Management: Data-driven methodology to reduce defects/variation.

• DMAIC Cycle: Define, Measure, Analyze, Improve, Control.

• Quality Metrics:

  • DPMO (Defects Per Million Opportunities).

  • Sigma Level – Process capability (6σ = 3.4 DPMO).

• Objectives in TQM: Near-perfect quality, customer satisfaction, cost reduction.

4P’s of Marketing

7. Special Topics and Integrated Applications

• Energy Conservation vs. Efficiency: Reinforce distinction – conservation = less use, efficiency = same output with less input.

• Pump Head-Flow & System Resistance: Integrated to find optimal operating point (BEP) and avoid energy waste from throttling/overloading.

• Material Balance Problems: Applied in audits to determine unknown flow rates, yields, losses (e.g., mixing, distillation).

• Heat Transfer Calculations: Used in insulation design (Q = U·A·ΔT), furnace cooling (m·c·ΔT), boiler efficiency (loss calculations).

• Power Factor Correction: Integrated with financial savings – reduce demand charges (kVA) and energy charges (kWh) via capacitor installation.

[!TIP]

In exams, always link technical conservation measures (e.g., VFDs, insulation) to economic analysis (NPV, payback) for holistic answers.