Limbaja Energy

Chiller Performance Measurement

Chiller Performance Measurement

Overview

The performance assessment of the chiller plant involves calculation of cooling duty delivered by the system and measurement of power consumed by the unit. The Specific Power Consumption (SPC - kW/TR) and Energy Efficiency Ratio (EER) are the effective measures for comparing the electrical energy input to cooling duty delivered by the system. The study involves measuring various parameters such as flow rate, temperature and power in the both chilled water and refrigeration side of the chiller system.

Refrigeration Effect

Formula

  • Refrigeration Effect (TR) = (Flow(Q) × Cp × (Ti – T0)) / 3024

Where:

  • Q = Flow Rate m3/s
  • Cp = Specific Heat kcal/kg deg C
  • Ti = Inlet Temperature (Deg C)
  • T0 = Outlet Temperature (Deg C)

Scope of Work

Review of present HVAC system like Chillers, central AC, window AC, split AC, package AC, Water Coolers, Cooling Towers, AHUs, Insulation System, Chilled Water Pumps, Condenser Water Pumps and Air Heaters etc.(More than 3 HP)
Performance assessment of & Estimation of actual tonnage of HVAC system and comparison of actual parameters with the design values and corrective actions.
Evaluation of operating Coefficient of Performance of Precision Air Conditioner. Evaluation of specific energy consumption of precision Air Conditioner. Identification and suggestions for performance improvement and energy saving potential.

Case Study

Energy Conservation Measures

  • Maintain the chiller Specific norms and reduce the chiller consumption by Overhaul of the Existing Chiller

Calculation

SNParameterUnitChiller
1Actual Chiller Capacity RequirementTR103.34
2Existing Specific energy consumption of screw chillerkW/TR0.81
3Suggest Specific energy consumption of screw chillerkW/TR0.70
4Specific Energy Consumption SavingkW/TR0.11
5Power SavingkW11.58
6Electrical unit costRs/kWh9.57
7Daily working hourhr24.00
8Annual Operating DayDay330.00
9Annual Power SavingkWh91693
10Annual Monetary savingRs877067
11Investment of Overhaul Water Cooled Screw chillerRs600000
12Simple Payback periodMonth8.21

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