Refrigeration device
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Solution Overview
Problem
Conventional refrigeration devices face limitations in energy efficiency and heating capacity, particularly under ultralow temperature conditions, due to restricted amplitude of improvement in heating capacity and COP, and design incompatibility with energy efficiency in cold regions.
Innovation Solution
A refrigeration device comprising a first compressor unit with two compression chambers, two throttle devices, and an auxiliary compressor unit connected in parallel, along with an air supply device and an air-liquid separator, allowing for variable capacity modes and improved refrigerant flow paths to enhance heating capacity and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If double-stage or quasi-double-stage compression intermediate air-supplying and enthalpy-enhancing technology is adopted, then low-temperature heating capacity and COP are improved, but the improvement amplitude is limited and exhaust temperature reduction is insufficient
Solution Approach 1:
The compression process is divided into multiple stages with intermediate cooling and air-supplying steps. The refrigeration device uses a two-stage compressor with intermediate cooling, where the refrigerant is cooled between compression stages, allowing for greater compression ratio and improved heating capacity at low temperatures without excessive exhaust temperature increase.
Solution Approach 2:
An air supply device is introduced as an intermediary component between the compressor and condenser. This device supplies air to the compressor intake, enabling intermediate cooling and enthalpy enhancement of the refrigerant, which improves both heating capacity and energy efficiency beyond conventional single-stage systems.
2Power
If double-stage or quasi-double-stage compression intermediate air-supplying and enthalpy-enhancing technology is adopted, then low-temperature heating capacity and COP are improved, but exhaust temperature reduction is limited
Solution Approach 1:
The compression process is segmented into stages with intermediate cooling. By cooling the refrigerant between compression stages and introducing air for enthalpy enhancement, the system achieves better temperature control, improving heating capacity while managing exhaust temperature more effectively than single-stage systems.
3Device complexity
If air-supplying and enthalpy-enhancing proportion is restricted by displacement ratio of high pressure stage to low pressure stage, then system structure is simplified, but application to heat pump type air conditioner results in design incompatibility of capability and energy efficiency
Solution Approach 1:
The system employs variable capacity control for the air supply device, allowing the air-supplying and enthalpy-enhancing proportion to be dynamically adjusted based on operating conditions. This enables the heat pump to adapt to different temperature and load conditions, achieving both capability and energy efficiency requirements across various applications.
Solution Approach 2:
The displacement ratio and air supply proportion are treated as variable parameters rather than fixed values. By changing these parameters according to operating conditions, the system achieves design compatibility for both capability and energy efficiency in heat pump type air conditioners, overcoming the limitations of fixed-ratio systems.
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
Significantly improves ultralow temperature heating capacity and energy efficiency ratio, achieving compatibility of high energy efficiency and capability under wider operating conditions, while eliminating the need for auxiliary electric heaters and enhancing safety by reducing potential hazards.
Implementation Method 1
a first compressor unit (101), an indoor heat exchanger (3) and an outdoor heat exchanger (2), sequentially communicated, an outlet of the first compressor unit (101) is communicated with an inlet of the indoor heat exchanger (3)
Implementation Method 2
an indoor heat exchanger (3) and an outdoor heat exchanger (2), sequentially communicated
Implementation Method 3
a first throttle device (401) and a second throttle device (402), sequentially connected in series and provided between the outlet of the indoor heat exchanger (3) and the inlet of the outdoor heat exchanger (2)
Data Source
AI summary
The invention discloses a refrigeration device, including: a first compressor unit (101), an indoor heat exchanger (3) and an outdoor heat exchanger (2), sequentially communicated; a first throttle device (401) and a second throttle device (402), sequentially connected in series; and an air supply device (5), provided between the first throttle device (401) and the second throttle device (402). The refrigeration device further includes a second compressor unit (102). An air intake port (B) of the second compressor unit (102) is communicated with an outlet of the outdoor heat exchanger (2). An outlet (E) of the second compressor unit (102) is communicated with the air supply port (C) of the first compressor unit (101) and an air exhaust port (D) of the first compressor unit (101) by means of a three-way valve (10), respectively.