Hydronic Bypass Loop Control for Heat Pump Over-Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydronic heating/cooling systems face challenges in efficiently controlling liquid flow and preventing internal over-pressure in heat pumps, often requiring complex valve systems or energy-wasting solutions like constant flow in one loop.
Innovation Solution
Designating a bypass loop in the system, where the actuator remains open when all other actuators are closed, ensures continuous flow without the need for pressure-controlled bypass valves, maintaining system efficiency and preventing internal over-pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure-controlled bypass valve is used to prevent internal over-pressure in the heat pump, then the heat pump is protected from over-pressure, but the system complexity increases and energy efficiency decreases due to continuous flow requirements
Solution Approach 1:
The patent removes the pressure-controlled bypass valve from the system entirely. Instead of extracting a component, it extracts the function of pressure regulation by implementing a control system that monitors pressure and selectively opens bypass loop actuators only when needed, eliminating the continuous flow requirement and associated complexity of mechanical bypass valves
Solution Approach 2:
The patent replaces the mechanical pressure-controlled bypass valve with an electronic control system that uses pressure sensors and controller logic to actuate bypass loop valves. This substitution allows for more precise, demand-based flow management rather than continuous mechanical bypass flow
2Reliability
If a pressure-controlled bypass valve is installed to maintain continuous flow, then internal over-pressure is prevented, but energy consumption increases due to unnecessary continuous flow
Solution Approach 1:
The patent implements periodic monitoring of system pressure by the controller and activates bypass flow only during periods when pressure exceeds thresholds. The bypass actuator operates intermittently based on actual pressure conditions rather than maintaining continuous flow, significantly reducing energy consumption while maintaining protection
Solution Approach 2:
The system uses its own pressure sensor and controller to automatically manage bypass flow based on actual system conditions. The control system serves itself by monitoring pressure and making autonomous decisions about when bypass flow is needed, eliminating the need for external pressure-controlled valves that mandate continuous flow
3Temperature
If actuators in all loops are closed to meet temperature control demands, then temperature control is achieved, but internal over-pressure occurs in the heat pump
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors pressure in the heat pump and responds by opening bypass loop actuators when pressure exceeds predetermined thresholds. This feedback loop allows the system to maintain temperature control in active loops while automatically relieving pressure buildup through bypass loops
Solution Approach 2:
The patent changes the operational parameter of bypass loop actuators from closed to open state based on pressure conditions. When all heating loops are closed for temperature control, the controller detects pressure buildup and changes the state of bypass actuators to open, allowing pressure relief while maintaining temperature control in active loops
Data Source
Figure 1~2
AI summary
The invention relates to a hydronic heating/cooling system. In the system, liquid is led along a main supply pipe (1 ) to a supply manifold (2) and distributed in the manifold into heating loops (3). The heating loops (3) return to return manifold (4). At least one of the manifolds (2, 4) has actuators (6) for controlling the flow in the heating loops (3). At least one loop is designated to be a bypass loop. The actuators (6) in the loops (3) are monitored and it is ensured that the actuator (6) of the bypass loop is open if all the other actuators (6) are closed.