Method for improving operational efficiency of a cooling system through retrofitting a building with a master controller
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Solution Overview
Problem
Existing HVAC systems face inefficiencies in energy consumption and thermal comfort management, particularly in balancing heat transport rates between Air Handling Units (AHUs) and cooling towers, leading to higher energy costs without maintaining desired thermal comfort.
Innovation Solution
A Master Controller (MC) is introduced to automatically adjust the speeds of electric chilled water pumps, AHU fans, condenser water pumps, and cooling tower fans, along with strategic valve positioning, to maintain a balanced heat transport rate while reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the speeds of chilled water pumps, AHU fans, condenser water pumps, and cooling tower fans are increased to maintain thermal comfort, then cooling performance is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the speeds of chilled water pumps, AHU fans, condenser water pumps, and cooling tower fans based on real-time thermal comfort requirements and cooling loads. The master controller continuously monitors system parameters and optimizes component speeds to maintain thermal comfort while minimizing energy consumption, rather than operating at fixed high speeds.
Solution Approach 2:
The invention changes operational parameters (speeds of various pumps and fans) to optimize system performance. By adjusting these parameters dynamically according to actual cooling needs, the system maintains thermal comfort while reducing energy consumption compared to constant high-speed operation.
2Use of energy by moving object
If the speeds of chilled water pumps and condenser water pumps are decreased to reduce energy consumption, then energy efficiency is improved, but heat transport rate balance between AHUs and cooling towers deteriorates
Solution Approach 1:
The master controller implements feedback control by continuously monitoring the heat transport rates of chilled water and condenser water loops. When pump speeds are adjusted to reduce energy consumption, the system detects any imbalance in heat transport rates and automatically adjusts other parameters (such as cooling tower fan speeds or valve positions) to restore balance, ensuring both energy efficiency and proper heat transport.
Solution Approach 2:
The system dynamically balances heat transport rates by adjusting multiple parameters simultaneously. When pump speeds are reduced for energy savings, the controller dynamically compensates by adjusting cooling tower operation or water flow distribution to maintain the necessary heat transport balance between AHUs and cooling towers.
3Productivity
If a master controller is introduced to optimize HVAC operation, then operational efficiency is improved, but system complexity increases
Solution Approach 1:
The master controller serves multiple functions: it monitors thermal comfort conditions, controls chilled water pump speeds, controls condenser water pump speeds, adjusts AHU fan speeds, adjusts cooling tower fan speeds, and balances heat transport rates. By consolidating these diverse control functions into a single multi-functional device, the system improves operational efficiency while limiting the increase in complexity compared to having separate control systems for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The MC ensures efficient energy use by optimizing the operation of HVAC components, reducing overall energy consumption while maintaining consistent thermal comfort and cooling load, thereby improving operational efficiency.
Implementation Method 1
The chiller interconnects with the AHU loop and with the cooling tower loop for transferring heat from the cooling water to the condenser water
Implementation Method 2
cooling tower loop, it comprises at least two cooling towers
Implementation Method 3
cooling tower loop, it comprises at least two cooling towers
Data Source
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AI summary
The application provides a method of operating a Heating, Ventilating, and Air Conditioning (HVAC) arrangement for a building. The method comprising a Master Controller (MC) changing speed of the at least one electric chilled water pump, the MC changing speed of the at least one electric condenser water pump, and the MC selecting a number of active cooling towers with adjusting speed of their respective cooling tower fan.