Heat Utilization Balance Processor for R407C Phase-Change Stability
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Solution Overview
Problem
Heat pump water heaters using R407C refrigerant face issues with temperature glide, leading to imbalanced phase change processes and reduced heat exchange efficiency, affecting operational performance and safety.
Innovation Solution
A heat pump water heater with a heat utilization balance processor, featuring a circulation loop with a Twist spiral heat exchange pipe and steam-liquid separator, which facilitates low-frequency turbulence heat exchange, ensuring balanced heat transfer during condensation and evaporation processes, and preventing liquid impact faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If R407C refrigerant is used as an environmentally friendly alternative to R22, then environmental protection is improved, but temperature glide causes imbalanced phase change process and reduced heat exchange efficiency
Solution Approach 1:
The heat exchanger is divided into multiple independent heat exchange units (first heat exchange unit and second heat exchange unit) with different structural configurations. The first unit uses a specific tube arrangement while the second unit uses a different tube arrangement, allowing each segment to optimize for specific phases of the refrigeration cycle (condensation vs evaporation), thereby resolving the temperature glide issue while maintaining high heat exchange efficiency
Solution Approach 2:
Different regions of the heat exchanger are given different local characteristics - the first heat exchange unit has tubes arranged to optimize for condensation heat transfer, while the second heat exchange unit has tubes arranged to optimize for evaporation heat transfer. This local differentiation allows the system to handle the temperature glide of R407C refrigerant effectively while maintaining overall high efficiency
2Device complexity
If conventional heat exchanger design is used with R407C refrigerant, then device complexity is reduced, but temperature glide leads to imbalanced phase change process affecting operational safety
Solution Approach 1:
The heat exchanger is segmented into multiple independent units with different tube arrangements optimized for specific phases. This segmentation allows balanced phase change processes for R407C refrigerant, preventing operational safety issues while keeping the overall device complexity manageable through modular design
Solution Approach 2:
The heat exchanger design accommodates the dynamic temperature glide characteristics of R407C refrigerant by providing different tube arrangements in different units, allowing the system to dynamically adapt to changing thermal conditions during phase change processes, thereby improving operational reliability
3Ease of manufacture
If surface heat transfer coefficient is low after refrigerant conversion, then ease of manufacture is improved, but heat exchange performance deteriorates
Solution Approach 1:
Different local regions of the heat exchanger have different tube arrangements - the first heat exchange unit has tubes arranged to enhance condensation heat transfer, while the second heat exchange unit has tubes arranged to enhance evaporation heat transfer. This local optimization compensates for the low surface heat transfer coefficient issue while maintaining ease of manufacture
Solution Approach 2:
The heat exchanger employs curved or spiral tube arrangements in specific units to enhance heat transfer performance. The curved tube design increases turbulence and heat transfer coefficient, compensating for the low surface heat transfer coefficient that occurs after R407C refrigerant conversion, while remaining manufacturable
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 design enhances heat transfer efficiency by 40% and prevents liquid impact faults, ensuring stable operation and energy efficiency, while maintaining the refrigerant in an overcooling state for effective condensation and evaporation.
Implementation Method 1
low-frequency turbulence heat exchange
Implementation Method 2
heat exchange pipe...facilitates low-frequency turbulence heat exchange
Implementation Method 3
during a condensing process
Implementation Method 4
during an evaporation process
Implementation Method 5
steam-liquid separator...preventing liquid impact faults
Data Source
AI summary
A heat pump water heater with a heat utilization balance processor and a heat utilization balance processor thereof relate to a fluid heater using a heat pump and an accessory thereof, the heat pump water heater comprises the heat utilization balance processor; which comprises a housing, a heat exchange pipe, a main heat exchange cavity, a sub heat exchange cavity and a steam-liquid separator. The heat utilization balance exchange is carried out for a working substance through the sub heat exchange cavity of the heat utilization balance processor during a condensing process and an evaporation process, so as to carry out the heat comprehensive utilization, thus increasing condensing effect, decreasing high pressure and exhaust temperature, decreasing the power consumption of a compressor, and increasing the energy efficient of a unit.