Air conditioning unit having dynamic target condensing and evaporating values based on load requirements
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Solution Overview
Problem
In multi-type air-conditioning systems enabling cooling/heating mixed operations, controlling evaporating and condensing temperatures to reduce power consumption is insufficient, and the high rotation speed of fans increases power consumption relative to the compressor, reducing energy-saving effects.
Innovation Solution
An air-conditioning apparatus with a heat source side unit and load side units connected by refrigerant piping, featuring temperature detection and load detection means to adjust target temperatures and control compressor and fan frequencies, ensuring the condensing and evaporating temperatures coincide with set targets, while optimizing fan rotation speed and compressor operation based on load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fan rotation speed is increased to control condensing and evaporating temperatures, then temperature control precision is improved, but fan power consumption increases
Solution Approach 1:
The patent applies dynamics by making the fan rotation speed variable rather than fixed. The control unit dynamically adjusts fan speeds based on real-time compressor frequency and load conditions, optimizing the balance between temperature control precision and power consumption. This is evident in the control unit's ability to set different target condensing temperatures and evaporating temperatures based on compressor frequency ranges.
Solution Approach 2:
The patent changes operating parameters (fan rotation speed, target temperatures) based on compressor frequency. By dividing compressor operation into different frequency ranges and assigning appropriate fan speeds and temperature targets for each range, the system optimizes energy efficiency while maintaining temperature control. This parameter change approach is central to resolving the contradiction between control precision and energy consumption.
2Use of energy by moving object
If compressor frequency is decreased to reduce power consumption, then energy-saving effect is improved, but temperature control capability deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring compressor frequency, suction temperature, and other parameters, then adjusting target condensing and evaporating temperatures based on this feedback. The control unit uses the detected compressor frequency to determine appropriate temperature targets, ensuring temperature control capability is maintained even when compressor frequency varies for energy saving.
Solution Approach 2:
The patent applies preliminary action by pre-defining target temperature tables for different compressor frequency ranges. Before actual operation, the control unit determines the appropriate frequency range and selects the corresponding target temperatures in advance, ensuring that temperature control capability is preserved while allowing compressor frequency to be optimized for energy consumption.
3Device complexity
If constant target temperatures are used for condensing and evaporating, then system simplicity is improved, but energy-saving effect deteriorates
Solution Approach 1:
The patent makes the control system dynamic by varying target condensing and evaporating temperatures based on compressor frequency and load conditions. Rather than using fixed constant temperatures, the control unit dynamically adjusts target temperatures to match actual operating conditions, achieving energy savings while maintaining manageable system complexity through algorithmic control.
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 enhances energy-saving effects by precisely controlling both evaporating and condensing temperatures, reducing power consumption by optimizing compressor and fan operation according to load conditions.
Implementation Method 1
a heat source side unit including a compressor and an outdoor heat exchanger connected in series by piping
Implementation Method 2
an outdoor heat exchanger including a fan, the heat source side unit being configured to supply heat via refrigerant
Implementation Method 3
an outdoor heat exchanger including a fan
Implementation Method 4
an outdoor heat exchanger including a fan
Implementation Method 5
the refrigerant control unit and each load side unit are connected in series by piping, and the load side units are connected in parallel by piping
Implementation Method 6
each of the load side units being supplied with the heat from the heat source side unit via the refrigerant
Data Source
AI summary
A target condensing temperature and a target evaporating temperature are changed in accordance with a load of each load side unit obtained by using load detection means, and an operating frequency of a compressor and a rotation speed of a fan are controlled such that a condensing temperature obtained by using temperature detection means coincides with the target condensing temperature and an evaporating temperature obtained by using the temperature detection means coincides with the target evaporating temperature.