Gas-Fired Modular Blower Control for Heat Pump Hybrid Heating
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Solution Overview
Problem
Existing heat pump systems in cold climates require auxiliary heating, leading to increased energy costs due to the inefficiency of electric resistance heating and fuel-fired supplemental systems, which compromise the overall efficiency of hybrid heating systems.
Innovation Solution
A reversible circuit heat pump system integrated with a non-condensing type fuel-fired modular blower that automatically switches to combustion heat only when the heat pump's refrigerant-based heating is insufficient, ensuring efficient use of fuel-fired heat as a secondary source without user override.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric resistance strip heaters are added to supplement heat pump capacity, then heating comfort is improved, but operating cost increases significantly
Solution Approach 1:
The patent combines the heat pump system with a gas-fired modular blower into a hybrid heating system. The gas blower is integrated with the heat pump's air handling components, allowing seamless operation of either heating source through a unified control system that manages refrigerant flow and gas burner activation based on heating demand and outdoor temperature conditions.
Solution Approach 2:
The control system dynamically adjusts system parameters including refrigerant valve positions, gas burner activation, and blower speed based on outdoor temperature and heating demand. The system transitions between heat pump-only mode, hybrid mode with gas supplementation, and gas-only mode as temperature parameters change, optimizing the mix of heating sources to minimize operating cost while maintaining comfort.
2Use of energy by moving object
If fuel-fired supplemental heating is used to replace electric resistance heating, then operating cost is reduced, but overall system efficiency decreases
Solution Approach 1:
The gas-fired blower operates partially rather than continuously, activating only when the heat pump cannot meet the heating load alone. The control system calculates the supplemental heating needed and activates the gas burner for the precise duration and intensity required, avoiding unnecessary fuel combustion and maintaining high overall system efficiency while reducing operating costs during high-demand periods.
Solution Approach 2:
The control system continuously monitors heating demand, outdoor temperature, and heat pump performance, using this feedback to determine when gas supplementation is necessary. The system adjusts the mix of heat pump and gas blower operation in real-time based on measured conditions, optimizing efficiency by activating fuel-fired heat only when and where needed rather than operating at fixed settings.
3Ease of operation
If user override capability is allowed for manual switching between heating sources, then operational flexibility is improved, but system efficiency control is compromised
Solution Approach 1:
The control system dynamically manages heating source selection based on real-time conditions, automatically transitioning between heat pump-only, hybrid, and gas-only modes as outdoor temperature and heating demand change. This dynamic control optimizes efficiency by making data-driven decisions about source activation, while still allowing user override when needed, balancing automated efficiency control with operational flexibility.
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 solution balances efficiency and operating costs by using combustion heat only when necessary, maintaining the heat pump's efficiency and reducing energy bills while preventing user override, thus optimizing hybrid heating performance.
Implementation Method 1
a reversible circuit heat pump that operates to either pump indoor ambient heat out of the building (during the heat pump's cooling cycle) or, with its refrigerant circuit reversed by operation of a reversible valve in the circuit, pump ambient outdoor air heat into the building (during the heat pump's heating cycle)
Implementation Method 2
a fuel-fired supplemental heating source used in place of the heat pump during high heating demand periods
Data Source
AI summary
An air heating and cooling system includes (1) a heat pump, illustratively devoid of auxiliary electric resistance type air heating structure, operative to provide refrigerant-based heating or cooling of air being delivered to a conditioned space, (2) a fuel-fired modular blower selectively operable to generate combustion heat, and (3) a control system associated with the heat pump and the modular blower. The control system has a heat pump thermostat electrically connected to a modular blower control and operative to transmit to the modular blower a first signal indicative of heating operation of the heat pump, and a second signal indicative of a need for alternative heat during a heating demand cycle. The modular blower is operative, in response to receiving both signals, to provide combustion-based air heating in place of refrigerant-based heat pump air heating.