Water Source Heat Pump Valve Control to Reduce Pump Energy Waste
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Solution Overview
Problem
Water source heat pumps (WSHP) are less efficient than desired due to high power and water consumption, particularly in part-load conditions, as they often require constant fluid flow through all condensers regardless of operating compressors, leading to unnecessary pump energy usage.
Innovation Solution
A multi-stage fluid delivery system with modulating motor-controlled valves that control fluid flow through condensers only when necessary, based on operating data and monitoring signals, allowing for staged operation of compressors and condensers, reducing fluid flow and pump energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant fluid flow is maintained through all condensers regardless of operating compressors, then reliable heat exchange is ensured, but pump energy consumption increases significantly
Solution Approach 1:
The fluid delivery system is segmented into multiple stages, with each stage having its own control valve that independently regulates flow to specific condensers based on compressor operation. This allows the system to divide the total fluid flow into controllable portions rather than maintaining constant flow to all condensers simultaneously.
Solution Approach 2:
The system transitions from static constant flow control to dynamic flow control using motor-operated valves that automatically adjust their opening degree based on real-time compressor operation status. The control system continuously monitors which compressors are running and dynamically modifies fluid distribution accordingly.
2Productivity
If all condensers receive fluid flow simultaneously, then comprehensive cooling coverage is achieved, but water consumption increases unnecessarily
Solution Approach 1:
The system applies different fluid flow qualities to different condensers based on local needs. Each condenser receives fluid flow only when its associated compressor is operating, creating a localized response rather than uniform flow distribution. This matches water delivery to actual cooling requirements at each location.
Solution Approach 2:
The system uses partial action by providing fluid flow to only the necessary subset of condensers at any given time, rather than excessive action that would supply all condensers regardless of need. The control valves modulate to provide exactly the right amount of flow to active compressors without over-supplying inactive ones.
3Use of energy by moving object
If multi-stage fluid delivery system with control valves is implemented, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The control valves serve multiple functions: they regulate fluid flow to match compressor operation, prevent water waste, reduce pump energy consumption, and provide staged control capability. This multi-functionality justifies the added complexity by delivering multiple benefits from a single system addition.
Solution Approach 2:
The system incorporates feedback mechanisms where the control system monitors compressor operation status and uses this information to automatically adjust valve positions. This closed-loop control simplifies operation despite the added hardware, as the system self-regulates based on real-time conditions without requiring manual intervention.
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 configuration achieves significant energy savings, reducing pump energy by up to 97% in four-compressor systems and 86% in two-compressor systems, by ensuring only active condensers receive fluid, thereby optimizing pump operation and reducing overall energy consumption.
Implementation Method 1
a modulating motor-controlled valve interposed the output conduit, the modulating motor-controlled valve configured to alter a flow of fluid through the condenser
Implementation Method 2
The water passes through a condensing coil and removes heat from the heat refrigerant before passing through the expansion valve
Implementation Method 3
a compressor, (2) a condenser being fluidly coupled to the compressor by refrigerant tubing
Data Source
AI summary
In one embodiment, a water system includes a compressor, a condenser fluidly coupled to the compressor by refrigerant tubing, a modulating motor-controlled valve configured to alter a flow of water through the condenser, an accelerometer mechanically coupled to the water system, and a water system controller. The water system controller may be configured to perform an automated anti-water hammer procedure. During the automated anti-water hammer procedure, the water system controller may be configured to activate an operating procedure for the water system, transmit a control signal to the modulating motor-controlled valve, receive vibrational measurements received from the accelerometer, compare the vibrational measurements measured by the accelerometer to a predetermined vibration level associated with the operating procedure, and adjust the opening position and opening speed of the modulating motor-controlled valve for the operating procedure if the vibrational measurements exceed the predetermined vibration level associated with the operating procedure.