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  • Comprehensive Energy Audits are targeted at saving energy costs through detailed techno-economic study.
  • This involves step-by step in-depth study of all energy consuming utilities/ equipment/ system etc. during operation, to assess and evaluate energy saving potential at each stage.
  • The approach is to study, measure, analyse and quantify useful and wasteful energy and evolve economically viable practical energy saving alternatives.
  • Assessment of building Energy Performance Index (EPI) in comparison to the BEE/ECBC guidelines


Comprehensive Energy Audit scope covers detailed study of the following systems in Buildings:

  • Electrical System
  • Electric Motors
  • Air Washers
  • Fans & Blowers
  • Pumping System
  • Air Conditioning System
  • Cooling Towers
  • Compressed Air System
  • Furnaces & Ovens
  • Boilers
  • Lighting System
  • DG Set

Electrical Systems

The scope of study of Electrical System comprises of electrical substations, transformer loading practices, power factor management, incoming voltage conditions and distribution losses.

  • Transformer Load Management
  • Power Factor Management
  • Distribution Losses
  • Incoming Voltage Conditions

Electric Motors

  • Measurement of operating power parameters such as kW, kVA, pf, Voltage, Current, Frequency
  • Analysis of loading of motors and sizing of motor to the load
  • Analysis of use of energy efficient motors for replacing oversized and inefficient motors
  • Analysis of possibility of operating motors in star mode wherever motors are under loaded
  • Analysis of reactive power compensation for motors operating at low PF
  • Analysis of application speed controlling devices
  • Analysis of energy efficient transmission
  • Analysis of application of soft starters

Air Washers

  • Flow and head measurement of spray water pumps and the air handling fans
  • Measurement of power consumption of air washer pumps & fans
  • Measurement of Supply Air temperature and RH
  • Evaluation of operating efficiency of air washer pumps & fans
  • Study of application and matching of drive
  • Study of flow control methods
  • Identifying energy conservation measures to reduce air washer energy consumption

Fans and Blowers

  • Flow and head measurement of fans & blowers
  • Measurement of power consumption of fans & blowers
  • Evaluation of operating efficiency of fans & blowers
  • Study of application and matching of drive
  • Study of flow control methods
  • Identifying energy conservation measures to reduce fans & blowers energy consumption

Pumping System

  • Flow & head measurement of water pumps by using ultrasonic flow meters & pressure gauges
  • Measurement of power consumption of water pumps
  • Evaluation of operating efficiency of water pumps
  • Study of water distribution system (to a possible extent including pipe sizing assessment)
  • Study of application and matching of drive
  • Study of flow control methods
  • Identifying energy conservation measures to reduce pumping system energy consumption

Air Conditioning System

  • Estimation of actual TR generation by the chillers
  • Measurement of power consumption and estimation of specific power i.e, kW/TR Operational features of compressors such as temperatures, pressure controls.
  • Study of auxiliary components including:
    • Chilled water/brine pumps
    • Condenser water pumps
    • Cooling tower fans
  • Identification of energy conservation measures to reduce refrigeration and air conditioning system energy consumption

Cooling Towers

  • Adequacy of installed cooling towers for connected plant equipment will be studied
  • Measurement of Cooling water flow rate,
  • Measurement of inlet and outlet water temperature of the cooling tower.
  • Measurement of dry bulb and wet bulb temperatures across the cooling tower
  • Approach and range of the cooling tower against its designed values
  • Estimation of the capacity utilization of the cooling tower
  • Estimation of heat load across the cooling tower
  • Efficiency evaluation of cooling tower pumps
  • Piping networks
  • Cooling tower optimization along with suitability of retrofits such, automatic temperature controller and optimization of cooling water users.

Compressed Air System

  • Free air delivery assessment of compressors (cfm)
  • Measurement and recording of power consumption pattern of compressor
  • Estimation of specific energy consumption (kW per cfm)
  • Analysis of loading and unloading pattern
  • Checking of Inter-cooler and after-cooler effectiveness
  • Analysis and review of optimum pressure generation
  • Analysis and review of pressure drop in the system
  • Optimization of compressed air distribution and utilization

Furnaces and Ovens

  • Study of loading practices
  • Measurements & logging of all electrical parameters such as current, kW, pf, frequency, kVA
  • Evaluation of energy balance and estimation of all heat output components
  • Estimation of surface heat losses
  • Estimation of specific energy consumption
  • Operational features of furnaces for temperature control
  • Application potential for various energy saving retrofits


  • Efficiency evaluation of boilers by indirect heat loss method and identifying the possibilities for improving the efficiency
  • Optimum steam generating pressure
  • Analysis of Loading Pattern
  • Pressure drop in the system
  • Distribution aspects such as line survey
  • Steam trap survey and Insulation survey
  • Performance evaluation of boiler auxiliaries (pumps, fans, blowers and cooling towers) for energy conservation

Lighting System

  • Illumination (Lux) measurements at various important areas of the plant
  • Power measurements at the lighting feeders
  • Review of the type of installed lighting fixtures and the operational practice
  • Review of present methods of switching and control of lighting system
  • Assessment for suitability of replacement with energy efficient latest technology lighting fixtures
  • Identifying energy conservation measures to reduce lighting system energy consumption

DG Set

  • Estimation of Specific Electricity Generation Ratio (SEGR)
  • Study of DG set loading & power factor
  • Study of auxiliary components such as pumps and cooling towers for energy efficiency aspects
  • Application of Waste heat recovery