Heat supply system coupling passive phase change energy storage sunlight room and air source heat pump
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Solution Overview
Problem
Air source heat pumps in low-temperature environments face reduced heating capacity and increased power consumption due to high compression ratios and low coefficient of performance (COP), while traditional solar-assisted systems struggle with inefficient heat storage and utilization, especially at night.
Innovation Solution
A heat supply system coupling a passive phase change energy storage sunlight room with an air source heat pump, utilizing phase change heat storage modules made of stainless steel with paraffin wax and expanded graphite, which store heat during the day and release it at night to maintain efficient heating and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional air source heat pump is used in low-temperature environment, then heating function is provided, but compression ratio becomes excessive and COP is greatly reduced
Solution Approach 1:
The sunlight room pre-heats the ambient air before it enters the evaporator of the heat pump during daytime, raising the evaporation temperature to a favorable range. This preliminary heating action prevents the compression ratio from becoming excessive and maintains high COP, thereby reducing energy loss during nighttime heating operation.
2Temperature
If solar water heating is applied to increase evaporative side temperature, then low-temperature adaptability is improved, but solar energy utilization rate decreases because room still needs heat pump heating
Solution Approach 1:
The sunlight room serves dual functions: (1) pre-heating ambient air for the heat pump evaporator to improve low-temperature adaptability, and (2) providing direct passive solar heating to the room during daytime. This multi-functionality increases solar energy utilization rate by meeting part of the room heating demand directly, reducing the need for heat pump operation during the day.
3Use of energy by moving object
If traditional passive sunlight room is used, then solar energy utilization rate is improved, but heating demand cannot be met around the clock due to heat storage limitations
Solution Approach 1:
The heat pump system acts as an intermediary to transfer heat from the sunlight room to the room at night. The sunlight room stores solar heat during daytime, and the heat pump evaporator absorbs this stored heat, transferring it to the condenser side to provide nighttime heating. This intermediary mechanism extends the duration of solar energy utilization beyond daylight hours.
4Temperature
If sunlight room directly heats the room during day, then solar energy is utilized, but heat storage capacity is insufficient for nighttime heating
Solution Approach 1:
The system changes the thermal parameters by using the heat pump to transfer heat at different temperature levels. During daytime, the sunlight room absorbs solar radiation and heats the ambient air. At night, the heat pump transfers this heat from the lower temperature sunlight room to the higher temperature room heating requirement, effectively utilizing the stored thermal energy despite the temperature difference.
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
Enhances heat storage capacity and utilization efficiency, reduces air source heat pump operation time and energy consumption, and stabilizes room temperature by leveraging solar energy storage and release, thus improving the COP and overall heating efficiency.
Implementation Method 1
phase change heat storage units, which store heat during the day and release it at night
Implementation Method 2
each phase change heat storage unit consists of a plurality of phase change heat storage modules made of stainless steel with paraffin wax and expanded graphite
Implementation Method 3
transferring heat in outdoor low-temperature ambient air into an indoor space by a steam compression circulation system
Implementation Method 4
steam compression circulation system driven by a motor
Implementation Method 5
passive phase change energy storage sunlight room...utilizing phase change heat storage modules...store heat during the day
Data Source
AI summary
The present disclosure discloses a heating system coupling a passive phase change energy storage sunlight room with an air source heat pump. The heating system includes a passive phase change energy storage sunlight room (7), phase change heat storage units, a to-be-heated room (8), and an air source heat pump air heater arranged between the passive phase change energy storage sunlight room (7) and the to-be-heated room (8), wherein each phase change heat storage unit (11) consists of a plurality of phase change heat storage modules (1). An opening in the front part of each phase change heat storage module faces an interior of the passive phase change energy storage sunlight room, and the phase change heat storage modules located on the top are spliced transversely, and the vent in the top of each phase change heat storage module is connected with the ventilation port of the room.