PVT heat pump system capable of achieving day-night time-shared combined cooling, heating and power using solar radiation and sky cold radiation
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Solution Overview
Problem
Current solar PVT systems have low utilization rates for energy and equipment due to their inability to efficiently output cold energy, operate around the clock, and integrate multiple energy forms in a simplified manner, leading to complex systems with high control difficulties and low energy efficiency.
Innovation Solution
A PVT heat pump system utilizing solar radiation and sky cold radiation, combining photovoltaic power generation and PVT heat pump technology, with a PVT photoelectric-evaporation/condensation module, four-way reversing valve, heat storage, and refrigerant management to achieve day-night time-shared combined cooling, heating, and power, optimizing energy transfer through radiation, heat conduction, and convection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solar PVT combined heating and power technology is used, then thermal energy and electric energy can be output during the day, but the system cannot achieve cold energy output in summer and cannot operate around the clock, resulting in low equipment utilization rate
Solution Approach 1:
The heat pump system is designed to perform multiple functions: heating during cold periods, cooling during hot periods, and power generation throughout the day and night. By integrating the heat pump cycle with photovoltaic power generation, the system can switch between heating mode and cooling mode based on seasonal requirements, enabling year-round operation and eliminating the limitation of only providing thermal energy during daytime.
Solution Approach 2:
The system enables continuous operation around the clock by combining photovoltaic power generation with heat pump technology. During daytime, photovoltaic panels generate electricity to power the heat pump, which can provide either heating or cooling. During nighttime, the heat pump continues to operate using stored or grid electricity, ensuring uninterrupted service and achieving 24/7 equipment utilization.
2Adaptability or versatility
If direct-expansion solar heat pump air-conditioning and hot water system is used, then combined operation of day and night with thermal energy and air-conditioning refrigeration energy can be achieved, but the system requires air-cooled heat exchanger and valve assistance, making it complex with high control difficulty and no power generation function
Solution Approach 1:
The patent merges photovoltaic power generation modules directly with the heat pump system, integrating power generation and thermal processing functions into a unified structure. This combination eliminates the need for separate air-cooled heat exchangers and complex valve systems, reducing overall system complexity while maintaining the capability for both cooling and heating operations.
Solution Approach 2:
The integrated PVT heat pump system serves multiple purposes simultaneously: generating electricity through photovoltaic panels, providing heating through the heat pump, and delivering cooling through the same heat pump system. This multi-functional design replaces the need for separate systems and reduces overall complexity.
3Use of energy by moving object
If additional electric energy is input for system operation, then the system can operate, but the performance coefficient is not high and energy utilization rate is low
Solution Approach 1:
The system merges photovoltaic power generation with heat pump operation, allowing the electricity generated by the photovoltaic panels to directly power the heat pump. This integration minimizes external electricity input requirements and maximizes on-site energy utilization, significantly improving the energy utilization rate and reducing energy losses.
Solution Approach 2:
The PVT heat pump system is designed to be self-sufficient by using the electricity generated from its own photovoltaic panels to power the heat pump operation. This self-service capability reduces dependence on external grid electricity, improves performance coefficient, and maximizes energy utilization by keeping energy cycles within the system.
4Ease of manufacture
If double-sided roll-bond PVT module is used, then processing difficulty is low, but the double-sided external protruding channel does not facilitate lamination and combination with photovoltaic module, causing obstruction to improvement of overall heating and power generation performance
Solution Approach 1:
The patent modifies the roll-bond PVT module structure by optimizing the channel configuration in specific areas to facilitate photovoltaic module lamination. By adjusting local structural characteristics rather than changing the entire module design, the system maintains ease of manufacture while improving the bonding interface between the heat exchange channels and photovoltaic cells, thereby enhancing overall heating and power generation performance.
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 and equipment utilization rates, enabling efficient output of electric, thermal, and cold energy at different times, improving energy-saving effects and simplifying system complexity, while allowing for self-sufficiency and grid connectivity, promoting green energy solutions.
Implementation Method 1
absorbing solar radiation and sky cold radiation
Implementation Method 2
solar photovoltaic power generation technology
Implementation Method 3
sky long-wave cold radiation energy
Implementation Method 4
energy transfer mode includes radiation and heat conduction
Implementation Method 5
heat convection is supplemented
Data Source
AI summary
The present invention provides a photovoltic and thermal (PVT) heat pump system capable of achieving day-night time-shared combined cooling, heating and power using solar radiation and sky cold radiation. The system utilizes a photovoltaic power generation technology and a photovoltic and thermal (PVT heat pump technology simultaneously, both of which are relatively independent and promoted to each other in the function. The main energy sources of the system are solar radiation energy and sky long-wave cold radiation energy, and the energy is respectively transformed into electric energy, thermal energy and cold energy via a photovoltic and thermal (PVT) photoelectric-evaporation/condensation module at different times in different working modes. The system of the present invention integrates power generation. heating, refrigeration and many other functions; and the equipment has simple composition, high utilization rate and remarkable energy-saving effect, thereby improving the energy utilization rate to the maximum extent, and achieving a multi-purpose machine and day-night time-shared combined cooling, heat and power.