Heat pump system
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Solution Overview
Problem
Existing heat pump systems face inefficiencies in simultaneously managing indoor heating and hot-water supply operations, leading to potential hot water shortages and reduced heating capacity due to insufficient heat source unit capacity and excessive subcooling, which affects operating efficiency and comfort.
Innovation Solution
A heat pump system with a refrigerant circuit configuration that includes an indoor-side heat exchanger, hot-water supply-side heat exchanger, and pressure reducing mechanisms, allowing for priority modes to adjust subcooling and discharge temperature, optimizing the balance between indoor heating and hot-water supply capacities by controlling the opening degrees of pressure reducing mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the heat source unit operates to provide both indoor heating and hot-water supply simultaneously, then the heating and hot-water supply can be implemented by a single system reducing installation space, but the heat source unit capacity becomes insufficient leading to hot water shortage or insufficient heating
Solution Approach 1:
The patent applies dynamics by making the pressure reducing mechanisms adjustable with variable opening degrees. The controller dynamically adjusts the opening degrees of the indoor-side and hot-water supply-side pressure reducing mechanisms based on real-time temperature differences and load conditions, enabling the system to flexibly allocate heat source capacity between heating and hot-water supply functions.
Solution Approach 2:
The patent changes the parameter of pressure reducing mechanism opening degree to control refrigerant flow distribution. By adjusting the opening degrees of the indoor-side and hot-water supply-side pressure reducing mechanisms, the system modifies refrigerant flow parameters to optimize heat source unit capacity utilization for both heating and hot-water supply operations.
2Power
If the opening degree of pressure reducing mechanisms is reduced to ensure indoor heating capacity, then heating capacity is maintained, but excessive subcooling occurs reducing operating efficiency
Solution Approach 1:
The patent implements feedback control by continuously monitoring temperature differences (indoor temperature difference and hot-water supply temperature difference) and using this information to adjust the opening degrees of pressure reducing mechanisms. This feedback mechanism prevents excessive subcooling while maintaining adequate heating capacity, optimizing operating efficiency.
Solution Approach 2:
The system dynamically adjusts the opening degree of the indoor-side pressure reducing mechanism based on real-time temperature difference feedback. Rather than using a fixed opening degree, the mechanism varies its opening to balance heating capacity requirements with subcooling control, preventing energy loss.
3Power
If the opening degree of hot-water supply-side pressure reducing mechanism is reduced to ensure indoor heating capacity, then heating capacity is sufficient, but hot-water supply capacity becomes insufficient
Solution Approach 1:
The patent uses dynamic adjustment of the hot-water supply-side pressure reducing mechanism opening degree based on hot-water supply temperature difference feedback. The opening degree varies dynamically to ensure adequate hot-water supply capacity while maintaining sufficient indoor heating capacity, resolving the trade-off between the two functions.
Solution Approach 2:
The system changes the opening degree parameter of the hot-water supply-side pressure reducing mechanism to control refrigerant flow to the hot-water supply heat exchanger. By adjusting this parameter based on temperature difference feedback, the system optimizes hot-water supply capacity without compromising heating capacity.
4Power
If the heat source unit operates at high capacity to meet peak heating demand, then heating capacity is sufficient, but hot-water supply capacity may be insufficient during simultaneous operation
Solution Approach 1:
The patent applies dynamics by enabling the hot-water supply-side pressure reducing mechanism to adjust its opening degree dynamically based on hot-water supply temperature difference. This allows the system to allocate heat source capacity to hot-water supply when needed, ensuring adequate hot-water supply capacity even during simultaneous operation with heating.
Solution Approach 2:
The system changes the opening degree parameter of the hot-water supply-side pressure reducing mechanism to redirect refrigerant flow to the hot-water supply heat exchanger when hot-water supply demand is high. This parameter adjustment enables the system to meet both heating and hot-water supply demands simultaneously.
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 maximizes heat source unit capacity and operating efficiency by adjusting subcooling and discharge temperature, ensuring adequate hot-water supply and indoor heating even under varying load conditions, thereby preventing hot water shortages and improving comfort.
Implementation Method 1
indoor-side pressure reducing mechanism (8) and a hot-water supply-side pressure reducing mechanism (12)... by controlling the opening degrees of pressure reducing mechanisms
Implementation Method 2
indoor-side heat exchanger (5) and a hot-water supply-side heat exchanger (10)... indoor heating and hot-water supply can be simultaneously operated
Implementation Method 3
refrigerant circuit including a compressor (1)... heat pump system configured to simultaneously control indoor-heating capacity and hot-water supply capacity
Implementation Method 4
a degree of subcooling of a liquid on the heating side and the hot-water supply side excessively increases... adjusts subcooling and discharge temperature
Data Source
AI summary
A heat pump system adjusts a degree of subcooling of an indoor-side heat exchanger in a heating priority mode, and adjusts any one of a degree of subcooling of a hot-water supply-side heat exchanger (water-side heat exchanger) and a discharge temperature of a compressor in a hot-water supply priority mode.