Heat Pump Flow Rate Detection Using Pump Power Consumption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heat pumps face efficiency issues and increased costs due to the need for separate sensors to detect water flow rate and air ratio, which complicates the detection of air proportion in the pipe, leading to potential surging and corrosion.
Innovation Solution
A heat pump system that calculates the flow rate of fluid and air ratio using power consumption data without a separate sensor, employing a controller to determine when to stop the pump based on predetermined reference rates and ratios to prevent surging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate sensor (such as a float switch) is provided to sense the flow rate of water, then the flow rate detection capability is improved, but the production cost increases
Solution Approach 1:
The water pump itself is used to sense the flow rate of water by detecting its own power consumption, eliminating the need for separate flow rate sensors. The controller calculates the flow rate based on the power consumption data from the pump motor, allowing the system to self-monitor without additional sensing components.
Solution Approach 2:
The water pump serves dual functions: both pumping water and sensing flow rate through its power consumption characteristics. This multi-functionality approach allows the pump to act as both a mechanical device and a sensing device, reducing the need for separate components.
2Measurement precision
If a separate sensor is provided to detect flow rate, then the measurement capability is improved, but the device complexity increases
Solution Approach 1:
The water pump system self-monitors flow rate by utilizing its own power consumption data, eliminating the need for external sensors and reducing system complexity. The controller processes the pump's electrical parameters to determine flow conditions.
Solution Approach 2:
The flow rate sensing function is merged with the water pump system itself. The controller integrates the power consumption detection and flow rate calculation functions, combining what would traditionally be separate sensing and pumping operations into a unified system.
3Device complexity
If the water pump operates without flow rate monitoring, then the device complexity is reduced, but harmful factors (surging, corrosion) increase
Solution Approach 1:
The controller continuously monitors the power consumption of the water pump and uses this feedback to detect flow rate conditions. When abnormal conditions are detected (indicating low flow or air presence), the system can adjust pump operation or alert operators, preventing surging and corrosion without adding complex sensing hardware.
Solution Approach 2:
The patent replaces mechanical flow sensors with an electrical measurement approach. By monitoring the electrical power consumption of the pump motor, the system infers flow conditions, substituting a simple electrical measurement for what would traditionally require mechanical sensing components.
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
This approach reduces production costs, improves reliability, and enhances safety by eliminating the need for additional sensors while effectively controlling fluid flow and preventing surging.
Implementation Method 1
calculating a flow rate of fluid flowing by the pump based on power consumption of the pump
Data Source
AI summary
A heat pump and a method for operating a heat pump are provided. The heat pump may include a compressor that compresses a refrigerant, at least one fluid-refrigerant heat exchanger that exchanges heat between the refrigerant and a fluid, such as water, a pump including a motor, the pump forcing the fluid to flow into the at least one fluid-refrigerant heat exchanger, and a controller. The controller may be configured to calculate power consumption of the pump, calculate a flow rate of fluid flowing due to the pump based on the power consumption of the pump, and control an operation of the pump to be stopped when the flow rate of the fluid is less than a predetermined reference flow rate.