Method of operating a heat pump for avoiding freezing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current heat pumps using a cold heat transfer liquid face issues such as excessive water usage, high energy consumption, and freezing risks due to fixed flow settings, leading to inefficient performance and potential damage during heating and cooling operations.
Innovation Solution
Implementing a temperature-controlled valve system that adjusts the flow of the cold heat transfer liquid based on real-time temperature monitoring, using a PID control method to maintain optimal temperature differences and prevent freezing, thereby minimizing water consumption and energy usage while ensuring proper functioning across various operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed high flow setting is used to guarantee problem-free functioning, then reliability is improved, but water consumption increases and energy consumption increases
Solution Approach 1:
The patent applies dynamics by replacing the fixed flow setting with a dynamically adjustable flow control valve that continuously adapts the cold heat transfer liquid flow rate based on real-time temperature measurements from the evaporator and ambient environment sensors, allowing the system to maintain reliability while optimizing water consumption across varying operating conditions
Solution Approach 2:
The patent implements feedback control by using temperature sensors to monitor evaporator temperature and ambient conditions, then feeding this information back to the controller which adjusts the flow control valve position accordingly, creating a closed-loop system that maintains reliable operation while minimizing water usage based on actual thermal demands
2Reliability
If a fixed high flow setting is used to guarantee problem-free functioning, then reliability is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the flow rate through the flow control valve based on real-time temperature conditions, reducing the energy required to pump water when high flow is not thermally necessary, while maintaining high flow settings only when required for reliable heat pump operation
Solution Approach 2:
Temperature feedback from evaporator and ambient sensors enables the controller to optimize pump energy consumption by adjusting flow rates to match actual thermal demands, preventing unnecessary energy expenditure while maintaining system reliability
3Reliability
If a fixed high flow setting is used, then reliability is improved, but the temperature difference on the cold side decreases
Solution Approach 1:
The flow control valve dynamically adjusts the cold heat transfer liquid flow rate to maximize the temperature difference across the evaporator by reducing flow when thermal demand is low, thereby improving heat pump efficiency while maintaining reliable operation through continuous monitoring and adjustment
4Quantity of substance
If the flow is reduced to minimize water usage, then water consumption decreases, but freezing risk increases
Solution Approach 1:
Temperature feedback from evaporator sensors enables the controller to maintain minimum flow rates required to prevent freezing when ambient temperatures drop, while allowing flow reduction during warmer conditions, thus minimizing water consumption without compromising system safety
Solution Approach 2:
The system takes preliminary anti-action by proactively monitoring ambient temperature and evaporator temperature to anticipate freezing conditions, adjusting the flow rate in advance to prevent freezing before it occurs, thereby enabling flow reduction during safe operating conditions
5Use of energy by moving object
If the flow is reduced to minimize energy consumption, then energy usage decreases, but freezing risk increases
Solution Approach 1:
Temperature feedback control enables the system to minimize pump energy consumption by reducing flow rates during warm conditions while automatically maintaining sufficient flow to prevent freezing when temperature sensors detect cold conditions, optimizing the energy-safety trade-off dynamically
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 solution effectively reduces water usage and energy consumption, maintains optimal temperature differences, and prevents freezing, ensuring stable operation and efficient performance during heating, cooling, and domestic hot water production.
Implementation Method 1
Implementing a temperature-controlled valve system that adjusts the flow of the cold heat transfer liquid based on real-time temperature monitoring, using a PID control method to maintain optimal temperature differences and prevent freezing
Implementation Method 2
heat pumps of the kind extracting thermal energy from a cold thermal energy source such as the ground, sea water or other external source in the environment having exchanged thermal energy with a cold heat transfer liquid
Data Source
Figure 1~3
AI summary
The invention relates to a method for operating a heat pump by use of a valve unit comprising at least one control valve in connection with the inlet of cold liquid circuit. The valve unit also comprises a sensor coupled to a heat pump controller. The heat pump controller constantly monitors the second temperature at a location between, and including, the inlet and the outlet of the first heat exchanger. The heat pump controller transmits a signal to the valve unit at least when the temperature of the cold liquid is below a threshold temperature, and the valve unit starts to increase the opening degree of the control valve when having received the signal from the heat pump controller. The invention also relates to a valve unit and to a heat pump with such valve unit.