for Sustainable Cooling Lekha Patmanathan 1 Nexergy 2019 - - - PowerPoint PPT Presentation

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Nexergy 2019 - Confidential – Please Do Not Circulate 1

Automating Thermodynamics for Sustainable Cooling

Lekha Patmanathan

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Nexergy 2019 - Confidential – Please Do Not Circulate 2 This Photo by Unknown Author is licensed under CC BY-NC-ND

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"Air conditioning was a most important invention for us, perhaps one of the signal inventions of

• history. It changed the nature of civilization by

making development possible in the tropics. Without air conditioning you can work only in the cool early-morning hours or at dusk. The first thing I did upon becoming prime minister was to install air conditioners in buildings where the civil service worked. This was key to public efficiency."

Typical Chiller Plant System

Nexergy 2019 - Confidential – Please Do Not Circulate

A Thermodynamic Approach

P1 P2 h3 h2 h1

Pressure Enthalpy

Sustainable Cooling is Optimizing Heat Exchange and Preventing typical mechanical issues from happening that affect Efficiency and Performance

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1. Condensing pressure + Discharge temp. 2. Evaporation pressure + Suction gas temp. 3. Condensing pressure + Liquid temp.

Massflow = Electrical power − heatloss Enthalpy increase compressor

COP = 𝐷𝑝𝑝𝑚𝑗𝑜𝑕 𝑑𝑏𝑞𝑏𝑑𝑗𝑢𝑧 Compressor power = 𝑛𝑏𝑡𝑡 𝑔𝑚𝑝𝑥 ∗ 𝑒𝐼 𝑓𝑤𝑏𝑞𝑝𝑠𝑏𝑢𝑝𝑠 𝑛𝑏𝑡𝑡 𝑔𝑚𝑝𝑥 ∗ 𝑒𝐼 𝑑𝑝𝑛𝑞𝑠𝑓𝑡𝑡𝑝𝑠 + 𝒊𝒇𝒃𝒖𝒎𝒑𝒕𝒕

Low P High P 2 1 3 Ideal compression Cooling capacity Electric power Heating capacity Enthalpy differences

Pressure Enthalpy

𝑒𝐼 𝑑𝑝𝑛𝑞. 𝑒𝐼 𝑓𝑤𝑏𝑞𝑝𝑠𝑏𝑢𝑝𝑠 Liquid temp suction temp Discharge temp

Thermodynamic analyses of a standard system

PA Pro III Onsite The ClimaCheck technology & method is an unbiased 3rd party M&V system using Cloud based Monitoring and Data Analytics Platform to measure and identify issues in any HVAC system for Predictive Maintenance. PA Pro III Online

Two Products for all our Real World Applications

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Intelligent Analytics

According to the chiller’s specific refrigeration cycle, a thermodynamic model is developed using advanced mathematical, computing tools together with intelligent analytics. The technology also uses refrigerant, lubricant, water and air thermodynamic databases when required

Evaporator Condense r

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USP’s

Using Advanced Thermodynamics, IoT , big-data analytics and cloud computing:

 Fully integrated technology, Hardware Agnostic, Open Source  Non-invasive, installs in minutes.  Temporary & Permanent deployment varieties  Carnot ideal cycle performance of systems

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ηEXERGY

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Benefits

 Improved Asset performance  Increased Efficiency  Predictive/Conditional Maintenance (as opposed to reactive maintenance)  Reduced operational cost  Electricity, Maintenance, Manpower, Water  Reduction in Emissions  Greenhouse gasses, Carbon  Increase reliability  Peace of mind for mission critical equipment  Increased longevity of equipment  Lowering Total Cost of Ownership

Lekha Patmanathan Founder 28C Stanley Street 068737 Singapore M:+65 9018 5230 E: lekha@nexergy.sg W: www.nexergysolutions.com

Nexergy 2019 - Confidential – Please Do Not Circulate

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Easy to apply – to standard service “points”

2 pressures from service ports Electrical input 7 surface temperatures

System Efficiency Index (SEI)

Developed by ClimaCheck & SP Technical Research Institute of Sweden (RISE). Funded by Swedish Energy Agency.

• ClimaCheck determines the COP that your chiller is able to deliver for the actual conditions that

thermodynamically limits your chiller performance.

• Manufacturer’s method are based on design data, but systems “never” operate at design data.

ClimaCheck calculates the actual COP (and kWh/ton) based on actual and ambient conditions. It identifies Energy Efficiency opportunities to maximize the COP even beyond the manufacturer standard.

• ClimaCheck provides a third party analysis without bias. As such, it will be able to identify calibration

needs in your sensors.