Air conditioning system with capacity control and controlled hot water generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing HVAC systems face challenges in efficiently conditioning air and heating water while maintaining operational flexibility and energy efficiency across varying environmental conditions, particularly in part-load conditions, and lack effective solutions for frost and freeze prevention in evaporators.
Innovation Solution
The HVAC system incorporates a desuperheater heat exchanger to heat water, variable speed components for pumps and compressors, bi-directional valves for bypass circuits, and a controller to manage refrigerant flow, enabling multiple operating modes for air conditioning and water heating, with features like modulating valves and rapid cycle solenoid valves to optimize heat exchange and prevent frost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a desuperheater heat exchanger is added to heat water, then hot water generation capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the air conditioning function and hot water heating function into a single integrated heat pump system. The desuperheater heat exchanger is integrated into the existing refrigerant circuit, allowing the system to simultaneously condition air and generate hot water using the same compressor and refrigerant flow, thereby achieving multiple functions without proportionally increasing complexity
Solution Approach 2:
The heat pump system is designed to perform multiple functions: space cooling, space heating, and hot water generation. The desuperheater serves as a universal component that can operate in different modes depending on system requirements, allowing the same hardware to provide both air conditioning and water heating services
2Use of energy by moving object
If variable speed components are used to optimize part-load efficiency, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent incorporates variable speed motors for the compressor, condenser fan, and pump that can dynamically adjust their operating speeds based on system demands and environmental conditions. This dynamic adjustment allows the system to maintain optimal efficiency across part-load conditions while adapting to varying hot water and air conditioning requirements
3Reliability
If bi-directional valves and bypass circuits are added for frost prevention, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces bi-directional valves and bypass circuits as intermediary components that mediate refrigerant flow to prevent frost formation on the evaporator. These components act as control mechanisms that redirect refrigerant flow or adjust pressure differentials to eliminate the harmful frost condition without requiring complete system shutdown
4Adaptability or versatility
If multiple reversing valves and 3-way valves are used for operating mode control, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent uses multiple reversing valves and 3-way valves to segment and control refrigerant flow into different circuits based on operating mode requirements. Each valve acts as an independent control element that can be activated or deactivated to direct refrigerant to the appropriate heat exchangers for cooling, heating, or hot water generation modes
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
The system achieves high energy efficiency, rapid hot water generation, and consistent performance across varying conditions, with improved frost prevention and enhanced operational flexibility, ensuring efficient hot water recovery and system reliability.
Implementation Method 1
a desuperheater heat exchanger operable as a condenser for heating water
Implementation Method 2
a source heat exchanger operable as either a condenser or an evaporator for exchanging heat with a source fluid
Implementation Method 3
a space heat exchanger operable as either a condenser or an evaporator for heating or cooling air in the space
Implementation Method 4
first and second expansion devices positioned between the source and space heat exchangers
Implementation Method 5
a compressor to circulate a refrigerant through the refrigerant circuit
Implementation Method 6
a refrigerant circuit that fluidly interconnects: (a) a compressor to circulate a refrigerant
Data Source
AI summary
An HVAC system is disclosed, comprising: (a) a compressor, (b) a source heat exchanger for exchanging heat with a source fluid, (c) a first load heat exchanger operable for heating/cooling air in a space, (d) a second load heat exchanger for heating water, (e) first and second reversing valves, (f) first and second 3-way valves, (f) a bi-directional electronic expansion valve, (g) a first bi-directional valve, and (h) a second bi-directional valve to modulate exchange of heat in the first load heat exchanger when operating as an evaporator and to control flashing of the refrigerant entering the source heat exchanger when operating as an evaporator, (h) a source pump for circulating the source fluid through the first load heat exchanger, (i) a water pump for circulating water through the second load heat exchanger, and (j) a controller to control operation of the foregoing.