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How to design the heating scheme of large space buildings in cold areas of north China?

time：2023-07-14
hits：1474次
source：正弘奧能

A remarkable feature of modern tall space buildings is that the interior height is higher and the volume is larger.The indoor height of the general gymnasium and exhibition hall can reach more than 10m, and the height of some industrial plants and maintenance warehouses can reach more than 30m.Due to the large space, especially in the cold or severe cold areas in the north, the temperature in the tall space is not balanced, and the temperature difference between the high and low places is large. In order to achieve good results in the heating of the tall space, the designer must consider the design of HVAC comprehensively to achieve the best heating effect.


	 


	The insulation of the wall and roof of the tall space building is usually not very good, more doors and Windows cause cold air penetration is very strong, the use of central heating, the end of the heat fin heating, in the Northeast can reach the standard of 5-10 degrees at most, so the heating company even if the output of a lot of heat can not get customer satisfaction.This is not the problem of the heating company, the root cause is determined by the nature of this convection heating method, that is, directly heating the air, caused by a large temperature gradient.If a forced hot fan is used, the essence is to heat the air, and the temperature is raised by air convection.However, the wind blowing out in the workshop will also make people feel very uncomfortable, the noise of the fan, the dust is an insurmountable problem.Convection heating, hot air in the tall space will produce a gradient effect, every 1 meter rise in height, the temperature will rise 1-1.5 degrees, the air is seriously stratified, hot under the cold, the roof heat loss is very large.Therefore, the traditional convection heating methods used in tall space buildings, such as heat sinks and forced hot air, are not the best solution.


	 


	<img src="http://www.mhsc009.cn/Uploads/image/20230714/20230714162657_37850.png" alt="" />


	 


	Infrared radiation heating technology is the heating equipment to release heat to the heating space in the form of infrared heat radiation to achieve the purpose of heating.Infrared rays directly heat people and objects downward, so the indoor temperature gradient is small.Part of the radiant heat will also be absorbed by the ground, and part of the heat absorbed by the ground will reverse the radiation heating of the room, thereby increasing the heating effect, and the heat loss of the upper part of the building is also small.This way of heat transfer better solves the special problem of heating in tall space buildings, and can also meet the requirements of comfort.Therefore, it is particularly suitable for tall space buildings, so that radiant heat can save considerable energy than convective heating system.Save energy by more than 50%.


	 


	Infrared radiation heating actual heating effect report, as shown in the figure below, heating area is hangar, radiation heating equipment is gas radiation heating equipment.The object is heated by infrared radiation, and the temperature gradient is uniform, and most of the heat acts on the object, and the heat achieves directional transportation.


	 


	<img src="http://www.mhsc009.cn/Uploads/image/20230714/20230714161857_94874.png" alt="" /> 


	 


	IMPRESIND gas infrared radiation heating, promoted and sold by Beijing Leadway Power&nbsp;Co., LTD., is the use of natural gas combustion in the generator to produce high temperature flue gas, the generated flue gas flows in the negative pressure radiation tube, so that the surface temperature of the radiation tube rises to 260-280℃, the high temperature surface of the radiation tube generates infrared radiation waves, heating indoor objects.After the heat exchange of the flue gas inside the radiation tube is completed, part of the product will be used for recirculation heating, and the other part will be discharged outdoors.At present, the technology of gas radiation heating equipment is very mature, and it is completely feasible for the gas to be discharged directly to the outside after combustion, which meets the requirements of environmental protection.


	 


	The gas radiation heating system can be designed according to the characteristics of tall space industrial plant buildings and the specific needs of customers.According to the heating needs of factories in the northern region, the heating temperature of the workshop can usually be set at 12-15 degrees during working hours, and the low temperature operation (5 degrees) or directly closed during non-working hours.

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How to design the heating scheme of large space buildings in cold areas of north China?