Heat pump chilling system and control method therefor
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Solution Overview
Problem
Existing heat pump chilling systems face issues with excessive operating capacity when all devices are activated simultaneously and prolonged activation times when devices are activated sequentially, leading to inefficiencies in restoring heating or cooling capacity after a power outage.
Innovation Solution
A heat pump chilling system and method that calculates the optimal number of devices needed based on individual operating capacities, allowing for simultaneous activation of devices that are neither too large nor too small, ensuring rapid activation and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If all heat source devices are activated simultaneously, then the requested capacity can be obtained quickly, but the overall operating capacity becomes excessive
Solution Approach 1:
The system dynamically adjusts the activation strategy based on real-time conditions. The control device calculates the number of devices to activate based on the requested capacity and current operating states, enabling flexible adaptation between simultaneous and sequential activation modes to optimize both response time and capacity utilization
Solution Approach 2:
The control device segments the activation process into two phases: initial simultaneous activation of calculated number of devices to quickly meet capacity requirements, followed by sequential activation of remaining devices. This segmentation allows the system to balance rapid response with controlled capacity buildup
2Power
If heat source devices are activated sequentially by a predetermined time period, then the operating capacity is controlled, but it takes too much time to complete activation
Solution Approach 1:
The system transitions from static sequential activation to dynamic hybrid activation. The control device continuously monitors requested capacity and adjusts the activation sequence in real-time, switching between simultaneous and sequential modes to minimize activation time while maintaining capacity control
Solution Approach 2:
The control device performs preliminary calculation of the optimal number of devices to activate simultaneously based on the requested capacity before activation begins. This preliminary action prevents excessive capacity while ensuring rapid response by activating the precise number of devices needed upfront
3Productivity
If a large number of heat pump chilling devices are activated simultaneously, then the requested capacity is met quickly, but the system becomes unstable
Solution Approach 1:
The control device implements feedback control by continuously monitoring the operating states of activated devices and the actual capacity output. Based on this feedback, the system adjusts subsequent activation decisions to maintain system stability while achieving rapid capacity restoration
Solution Approach 2:
The system uses dynamic activation control where the number and timing of device activations are adjusted in real-time based on system response. This dynamic approach prevents simultaneous activation of too many devices while ensuring rapid capacity buildup through optimized sequencing
Data Source
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AI summary
A heat pump chilling system includes an inlet temperature sensor that detects an inlet temperature of a heat medium flowing into a plurality of heat pump chilling devices, an outlet temperature sensor that detects an outlet temperature of flow from the plurality of heat pump chilling devices to a load, and a system control device that controls operation of the plurality of heat pump chilling devices based on the inlet temperature and the outlet temperature. The system control device includes a storage unit that stores an operating capacity for each of the plurality of heat pump chilling devices, a requested-capacity calculating unit that calculates a requested capacity based on the inlet temperature or the outlet temperature and a set target temperature, a number-of-devices calculating unit that calculates the number of devices to be activated among the plurality of heat pump chilling devices satisfying the requested capacity based on the operating capacity of each of the plurality of heat pump chilling devices, and an activation control unit that activates the plurality of heat pump chilling devices of the number of devices to be activated calculated in the number-of-devices calculating unit.