CO2 Heat Pump Return Water Stabilization
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Solution Overview
Problem
Existing constant-temperature water supply systems employing heat pumps are unstable due to fluctuations in primary side return water temperature, affecting energy efficiency and compressor overload, especially when inlet water temperature on the air cooler side is high.
Innovation Solution
A carbon dioxide heat pump system with a primary side loop, secondary side water supply pipeline, heat exchanger, and vertically arranged return water tank with temperature sensors and valves to stabilize return water temperature, ensuring constant-temperature water supply by controlling the return of water to the heat pump water heater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the primary side return water is directly introduced into the heat pump water heater for reheating, then the system structure is simple, but the outlet water temperature fluctuates and the system becomes unstable
Solution Approach 1:
The return water tank is divided into multiple segments with different temperature zones (first return water inlet at top, second return water inlet at middle, third return water inlet at bottom). Each segment corresponds to a specific temperature range, allowing the system to select the most appropriate water source based on current temperature conditions, thereby stabilizing the outlet water temperature while maintaining reasonable system complexity.
2Loss of energy
If the inlet water temperature on the air cooler side is too high, then the heat exchange efficiency is improved, but the exhaust temperature and pressure become too high causing compressor overload and reduced energy efficiency
Solution Approach 1:
The system changes the inlet water temperature parameter dynamically by selecting from different return water inlets based on temperature sensors. When the inlet water temperature is too high, the system switches to colder return water from lower inlets, preventing compressor overload while maintaining efficient heat exchange by optimizing the temperature differential across the heat exchanger.
3Stability of the object's composition
If multiple return water inlets with temperature sensors and valves are added to stabilize return water temperature, then the outlet water temperature stability is improved, but the device complexity increases
Solution Approach 1:
The system employs temperature sensors at different return water inlets that provide feedback to the control device. Based on this feedback, the control device automatically selects and opens the appropriate return water valve, creating a closed-loop control system that stabilizes return water temperature without requiring complex manual intervention or overly complicated mechanisms.
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
The system maintains a stable water temperature flow to the heat pump water heater, reducing energy inefficiencies and compressor overload by detecting and stabilizing return water temperature, resulting in a consistent and efficient water supply.
Implementation Method 1
a heat exchanger provided between the primary side loop and the secondary side water supply pipeline
Implementation Method 2
the heat exchanger comprises a first heat exchange tube and a second exchange tube arranged to exchange heat with each other
Implementation Method 3
a carbon dioxide heat pump water heater provided in the primary side loop
Data Source
AI summary
A constant-temperature water supply system employing a carbon dioxide heat pump includes a primary side loop, a secondary side water supply pipeline, a carbon dioxide heat pump water heater in the primary side loop, and a heat exchanger between the primary side loop and the secondary side water supply pipeline; the temperature of return water is detected and the temperature of a return water tank is detected, so even if the temperature of return water flowing out of a first heat exchange tube fluctuates, the return water can be input at a position in the return water tank having a close temperature, such that water in the return water tank is always in a stably layered state, and therefore allows for constant-temperature water supply.