Heat Pump Water Heater Control for Adaptive Turn-On Thresholds
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Solution Overview
Problem
Current heat pump water heaters face reliability and energy efficiency issues due to fixed turn-on temperature differences, leading to frequent on-off cycles at high ambient temperatures and delayed turn-on at low temperatures, which affect user comfort and system reliability.
Innovation Solution
A method and system for controlling heat pump water heaters that dynamically adjust the turn-on temperature difference based on ambient and set temperatures, using a processor to determine a turn-on threshold, ensuring the heat pump turns on only when necessary to maintain user comfort and system reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed turn-on temperature difference is used, then the control logic is simple and easy to implement, but the heat pump turns on and off frequently at high ambient temperatures and delays turn-on at low temperatures, affecting reliability and energy efficiency
Solution Approach 1:
The patent applies dynamics by making the turn-on temperature difference dynamic rather than fixed. The controller adjusts the turn-on temperature difference based on ambient temperature conditions: using a first turn-on temperature difference when ambient temperature is above a threshold, and a second turn-on temperature difference when ambient temperature is at or below the threshold. This dynamic adjustment prevents frequent on-off cycles at high temperatures and ensures timely heating at low temperatures, thereby improving system reliability while maintaining manageable control logic through predefined adjustment rules.
2Productivity
If a small fixed turn-on temperature difference is used, then the water temperature control is responsive, but the main engine turns on and off frequently at high ambient temperatures, increasing operation load and wasting energy
Solution Approach 1:
The patent applies parameter changes by modifying the turn-on temperature difference parameter based on ambient temperature conditions. When ambient temperature is high (above threshold), a larger first turn-on temperature difference is used to reduce the frequency of heat pump activation. When ambient temperature is low (at or below threshold), a smaller second turn-on temperature difference is used to maintain responsive water temperature control. This parameter adjustment strategy reduces energy waste from frequent cycling while preserving temperature control responsiveness when needed.
3Productivity
If a large fixed turn-on temperature difference is used, then the heat pump runs under high load conditions continuously, but this seriously affects the reliability of the heat pump system
Solution Approach 1:
The patent applies dynamics by adjusting the turn-on temperature difference based on ambient temperature to optimize the balance between heating capacity and system reliability. When ambient temperature is high, a larger first turn-on temperature difference allows the heat pump to operate more continuously at moderate load, improving reliability. When ambient temperature is low, a smaller second turn-on temperature difference enables the heat pump to operate in shorter, more intensive cycles, preventing continuous high-load operation and associated reliability issues. This dynamic parameter adjustment optimizes both productivity and reliability across different operating conditions.
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 improves user comfort and reduces the load on the heat pump system by intelligently controlling the turn-on threshold, enhancing both user experience and system reliability by optimizing energy usage and reducing frequent start-ups.
Implementation Method 1
a heat pump system to turn on so as to heat the water in the water tank
Data Source
Figure 1~2
Figure 3~4
AI summary
A heat pump hot water machine control method, for controlling a heat pump system of the heat pump hot water machine to turn on and heat water in a water tank, and the method comprising the following steps: receiving a turn-on instruction; detecting the current temperature of the water in the water tank and the ambient temperature; acquiring a turn-on temperature difference according to the setting temperature of the heat pump hot water machine and the ambient temperature, and acquiring a turn-on threshold according to the turn-on temperature difference; determining whether the current temperature is less than the turn-on threshold; if not, then maintaining the current state; and if so, then controlling to enable the heat pump system to heat the water in the water tank. Also disclosed is a heat pump hot water machine control system.