Radiation heat exchanging air conditioning system and radiation heat exchanging ceiling thereof
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Solution Overview
Problem
Prior ceiling air conditioning systems experience heavy dewing and 'artificial rain' in humid environments due to the direct contact between the heat-exchanging coil and metal ceiling plate, causing temperatures to drop below the dew point, leading to dew formation.
Innovation Solution
A direct-cooling air conditioning system with a radiation heat-exchanging ceiling design where the heat-exchanging coils are adjacent to but do not contact the metal ceiling plates, incorporating a thermal insulation material and optionally a metal foil layer, and a fresh air flue with a fan to prevent dewing, ensuring the system operates without direct contact and maintains a higher coolant inlet temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the heat-exchanging coil contacts directly with the metal ceiling plate to enhance heat transfer efficiency, then the heat-exchanging efficiency is improved, but the temperature at the contacting area drops below the dew point causing dewing and artificial rain
Solution Approach 1:
A layer of thermal insulation material is introduced between the heat-exchanging coil and the metal ceiling plate. This intermediary layer prevents direct thermal contact, allowing the coil to exchange heat with the ceiling plate through conduction across the insulation layer while maintaining the ceiling plate surface temperature above the dew point, thereby eliminating dewing while preserving heat transfer functionality
Solution Approach 2:
The system changes the thermal parameters by introducing insulation material with specific thermal conductivity properties. This modifies the heat transfer path and thermal resistance, enabling the ceiling plate to maintain a higher surface temperature despite the cooling effect of the circulating cold water in the coil, thus preventing condensation while still achieving effective cooling
2Temperature
If the circulating water temperature is set as low as possible for effective cooling in hot and moist areas, then the cooling effectiveness is improved, but the temperature at the contacting area of the metal ceiling plate drops below the dew point causing dewing
Solution Approach 1:
The thermal insulation material serves as a mediator that decouples the temperature relationship between the circulating water and the ceiling plate surface. This allows the use of lower water temperatures for effective cooling without directly transmitting that cold to the ceiling plate surface, thereby preventing dewing while maintaining cooling effectiveness
Solution Approach 2:
The insulation material creates a local thermal quality difference between the region where the coil is installed and the exposed ceiling plate surface. The installed area experiences intense cooling from the coil, while the exposed surface maintains a warmer temperature due to the insulation barrier, preventing dewing in the visible and functional areas
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 effectively prevents dewing, enhances heat-exchanging efficiency, and achieves higher energy efficiency by maintaining a higher coolant inlet temperature, resulting in a 30% energy savings compared to traditional systems.
Implementation Method 1
there is a layer of thermal insulation material on the top of the heat-exchanging coils
Implementation Method 2
The heat-exchanging coils are connected to the circulation loop of the water circulation system
Implementation Method 3
radiation heat-exchanging ceiling plates which comprise metal ceiling plates and heat-exchanging coils
Data Source
AI summary
A radiation heat exchanging air conditioning system and a radiation heat exchanging ceiling thereof are disclosed. The air conditioning system includes a heat pump system (7) and a water circulation system (8), and water circulation system (8) includes a heat exchanging device (11) for water, a pump (9), a heat exchanging device (10) for air, a radiation heat exchanging ceiling (20) and air outlets (15). The heat is exchanged between the heat exchanging device (11) for water and the heat pump system (7). The radiation heat exchanging ceiling (20) includes a metal ceiling panel (1) and a heat exchanging coil (2), said heat exchanging coil (2) is installed on the poor thermal-conductivity coil brackets (4) mounted on the upper surface of the metal ceiling panel (1), thus leading to the short distance and no direct contact between the heat exchanging coil (2) and the metal ceiling panel (1). A metal foil (5), a heat insulating material layer (3) and a seal layer (6) are provided above the heat exchanging coil (2).