Packaged HVAC unit with secondary system capability
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Solution Overview
Problem
Traditional HVAC systems for two-story homes often require separate units for each level, leading to inefficiencies, increased costs, and aesthetic mismatch issues due to the need for two outdoor units, which is costly, space-intensive, and inefficient.
Innovation Solution
A climate control system featuring a primary packaged unit with a secondary unit in refrigerant communication, sharing a common compressor, outdoor coil, and fan, allowing independent control of multiple zones with a reversing solenoid valve for heat pump and air conditioner functionality, and including diagnostic features for malfunction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate split HVAC systems are installed for each floor, then each zone can be independently controlled, but installation cost and space requirements increase significantly
Solution Approach 1:
The patent combines multiple outdoor units into a single integrated packaged HVAC system that serves multiple zones. The system integrates the compressor, condenser, and multiple evaporator circuits into one outdoor cabinet, eliminating the need for separate outdoor units while maintaining independent zone control through electronic expansion valves and a control board that manages refrigerant distribution to different floors.
Solution Approach 2:
The packaged HVAC system performs multiple functions within a single unit: it provides heating and cooling to multiple zones simultaneously, acts as both a condenser and evaporator system, and includes integrated controls for zone management. This multi-functional design replaces what would traditionally require separate dedicated outdoor units for each zone.
2Adaptability or versatility
If separate packaged units are installed for each floor, then each zone has dedicated equipment, but installation cost and maintenance complexity increase
Solution Approach 1:
The patent merges what would traditionally be separate packaged units into a single integrated system. By combining the compression, condensation, and evaporation functions for multiple zones into one outdoor unit, the system reduces installation cost while maintaining dedicated equipment for each zone through separate evaporator circuits and electronic controls.
Solution Approach 2:
While integrating outdoor components, the system segments the indoor distribution into separate circuits for different zones. Each zone has its own evaporator circuit with electronic expansion valves and controls, allowing independent operation and dedicated zone equipment functionality while sharing common outdoor components.
3Device complexity
If a single packaged unit serves multiple zones, then installation cost and space requirements are reduced, but refrigerant distribution to upper floors becomes challenging
Solution Approach 1:
The patent employs electronic expansion valves that dynamically adjust refrigerant flow based on zone requirements and system conditions. The control board continuously monitors and modulates valve openings to optimize refrigerant distribution to different floors, adapting to varying load conditions and ensuring proper refrigerant circulation despite elevation differences.
Solution Approach 2:
The system uses electronic expansion valves as intermediary devices between the common refrigerant source and individual zone evaporators. These valves act as mediators that precisely control refrigerant flow distribution to upper and lower floors, ensuring adequate refrigerant supply to each zone while managing the challenges of vertical distribution.
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 system enables efficient, cost-effective, and aesthetically pleasing climate control for multiple zones within a building by using a single outdoor unit, reducing installation costs and space requirements while ensuring reliable operation and maintenance.
Implementation Method 1
a primary indoor coil configured for circulating a refrigerant therethrough and a primary variable speed indoor fan configured to propel air through the primary indoor coil
Implementation Method 2
The compressor, outdoor coil and the outdoor fan are disposed within the primary packaged unit
Implementation Method 3
The primary unit and the at least one secondary unit shares a common variable speed compressor
Implementation Method 4
an outdoor fan configured to propel air through the outdoor coil
Implementation Method 5
The primary unit further includes a reversing solenoid valve disposed between the compressor and the primary indoor coil and between the compressor and the outdoor coil. The reversing valve configured to reverse the flow of refrigerant
Data Source
AI summary
Disclosed is a system for independently controlling the climate within a primary zone and at least one secondary zone of a building. The system comprises a primary packaged unit comprising a primary indoor coil and a primary variable speed indoor fan blowing over the primary indoor coil to serve the primary zone of the building. The system further comprises a secondary unit comprising a secondary indoor coil circulating the refrigerant and a secondary variable speed indoor fan blowing over the secondary indoor coil to serve a secondary zone of the building. The primary unit and the at least one secondary unit shares a common variable speed compressor, outdoor coil, and an outdoor fan that are disposed within the primary unit. First and second solenoid valves in the primary unit selectively control refrigerant flow to the primary and secondary units to enable independent control of the zones.