Control device, heat source system, control method, and control program
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Solution Overview
Problem
In heat source systems with multiple machines connected in series, the outlet temperature of chilled water is often set based solely on temperature, leading to potential overloading and insufficient cooling, especially when the inlet temperature is high, which can result in failure to achieve the required outlet temperature.
Innovation Solution
A control device and method that set the outlet temperature of each heat source machine based on both the measured flow rate and inlet temperature of the chilled water, using correction coefficients to adjust the outlet setting temperature and ensure effective temperature discharge within the system's capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outlet setting temperature of chilled water is set high to prevent exceeding machine capacity, then the machine operation remains within capacity limits, but the required outlet temperature cannot be achieved
Solution Approach 1:
The outlet setting temperature is dynamically adjusted based on real-time measurements of heat medium flow rate and inlet temperature. The control device calculates the required outlet temperature using these measured values, allowing the temperature setting to adapt to changing operating conditions rather than remaining fixed. This resolves the contradiction by enabling the system to achieve required temperatures when conditions permit while preventing capacity violations when they don't.
Solution Approach 2:
The system changes the outlet temperature parameter based on measured flow rate and inlet temperature values. By continuously monitoring these parameters and adjusting the outlet temperature setting accordingly, the system can optimize performance to meet temperature requirements without exceeding machine capacity limits under various operating conditions.
2Temperature
If the outlet setting temperature is set low to meet required temperature, then the required outlet temperature can be achieved, but the machine may operate beyond its capacity
Solution Approach 1:
The control device implements feedback control by measuring the actual flow rate and inlet temperature, calculating the required outlet temperature based on these measurements, and adjusting the outlet setting temperature accordingly. This closed-loop feedback mechanism ensures that the outlet temperature is set appropriately to meet requirements while preventing machine capacity violations through continuous monitoring and adjustment.
Solution Approach 2:
The outlet temperature setting is made dynamic rather than fixed, allowing it to adjust in real-time based on measured operating conditions. This dynamic adjustment enables the system to achieve required temperatures when machine capacity permits while automatically preventing capacity violations when conditions change.
3Device complexity
If the outlet setting temperature is determined only by temperature state, then the control is simple, but the system cannot effectively discharge required temperature when inlet temperature is high
Solution Approach 1:
The control system incorporates additional measured parameters (flow rate and inlet temperature) to determine the outlet setting temperature, moving beyond simple temperature-based control. This multi-parameter approach enables more effective temperature discharge by considering the actual operating conditions, including flow rate and inlet temperature variations.
Solution Approach 2:
The outlet temperature control is made dynamic by continuously measuring flow rate and inlet temperature and adjusting the outlet setting accordingly. This dynamic control strategy improves temperature discharge effectiveness compared to static temperature-only control, while maintaining reasonable system complexity through automated calculation.
Data Source
AI summary
The purpose of the present invention is to provide a control device, a heat source system, a control method, and a control program with which a heat medium at a required temperature can be more effectively sent out. This control device, which is applied to a heat source system 1 comprising a plurality of heat source machines (2a), (2b) connected in series, comprises a setting unit which sets the outlet setting temperatures of cool water in the respective heat source machines (2a), (2b) on the basis of: a measured value of a cool water flow rate, measured values of inlet temperatures of the cool water in the respective heat source machines (2a), (2b); and the required outlet temperature of the cool water in the heat source system (1).