| At present,residential buildings in northern China are mainly polluted by coal,and the energy consumption is huge.“Coal to electricity” heating using heat pump technology is an energy saving and emission reduction measure being implemented by the country.However the problems of poor thermal comfort are generally in the conventional air source heat pump heating and low efficiency when the outdoor air temperature is low.Considering that the radiant heating system has the advantage of higher thermal comfort,this article based on the thermal environment characteristics of the building,combined with the performance characteristics of the heat pump,optimizes the air-conditioning terminal arrangement,and combines it with fan coils.This system is numerically simulated to analyze the building The heat load and the total energy consumption of the system vary with the outdoor climate and indoor design temperature.The overall design of the air-conditioning radiant panel system is adopted for heating by means of radiant panel + fan coil,and the heat transfer pipe layout and material selection of the radiant panel are discussed.A system model of air-conditioning radiant panel calculation was established,and the heat transfer on the wall surface of the radiant panel was simulated using CHAMPS-BES software,and the heat transfer from the radiant panel to indoor and outdoor and the average temperature of hot water in the radiant panel were obtained.Analyze the energy consumption and COP of the established model system,and explore the impact of changes in outdoor temperature and indoor temperature on the system energy consumption when the air-conditioning radiant panel bears the external wall and external window heat loads,and the fan coils bear the fresh air load.When the indoor design temperature is 18 ℃ and the outdoor temperature is higher than-16 ℃,the total input power of the heating system using wall radiant panels is smaller than that of floor heating systems.When the outdoor temperature is-2 ℃,the total input power of the system decreases.Maximum;when the outdoor air temperature is higher than-18 ℃,the total input power of the heating system using the wall radiant panel is smaller than that of the fan coil heating system.When the outdoor temperature is-12 ℃,the total input power reduction is the largest.When the outdoor air temperature is-10 ℃,and the indoor air temperature is 24 to 16 ℃,the total input power of heating with wall radiant panel is smaller than that with fan coil system.When the indoor air temperature is less than 23 ℃,the total input power of heating with a wall radiant panel is smaller than that with a floor radiant heating system.When the indoor temperature is 16 ℃,the total input power reduction of the system is the largest.When the air-conditioning radiant panel system is used,the temperature of the inner wall surface is 9-5 ℃ higher than that when the fan coil and the floor radiant heating are used.Therefore,the air-conditioning radiant panel system is more suitable for indoor thermal comfort than the other two systems.Optimize the original air-conditioning radiant panel system.The air-conditioning radiant panel bears the external wall heat load.Explore the effect of changes in outdoor temperature and indoor temperature on the energy consumption of the system when the fan coils bear the external window load and fresh air load.When the indoor design temperature is 18 ℃ and the outdoor temperature is-20-0 ℃,the total input power of heating with wall radiant panel is smaller than that with fan coil and floor radiant heating system.When the outdoor temperature is-20 ℃,the total input power of the system decreases the most.When the outdoor temperature is-10 ℃ and the indoor temperature is 24 to 16 ℃,the total input power of heating with wall radiant panel is smaller than that with fan coil and ground radiant heating system.When the indoor temperature is 16 ℃,the total input power reduction is the largest.And after improving the system,the temperature of the inner wall surface when using the air-conditioning radiant panel system is 1-3 ℃ higher than that when using the fan coil and the floor radiant heating.The superiority of thermal comfort when heating with the air-conditioning radiant panel system can also be guaranteed.Low interior design temperature to achieve comparable heating levels.The improved system reduces the heat load of the air-conditioning radiant panel system,making full use of the advantages of this system,and is more suitable for use in northern heating environments with lower indoor design temperatures and lower outdoor air temperatures.The wall-mounted air-conditioning radiant panel arranged near the outer wall in this paper can effectively reduce the heating temperature requirement of the heat pump while effectively improving the indoor thermal comfort.The increase of the building heat load can reduce the actual heat pump power consumption with the increase of the heat pump COP.At low ambient temperatures,this design provides a way to heat using a heat pump,and the design system is simple and can be achieved with a single machine compression.This design provides a useful reference for the research and application of energy consumption and energy saving in buildings in the northern region with good thermal insulation performance. |
