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Heating design and energy-saving scheme for building with large space

time：2023-05-31
hits：1510次
source：正弘奧能

Large space for HVAC professional, usually more complex, the main focus is on the thermal load characteristics of tall space buildings.Because the tall space storey is relatively high, the space is relatively wide, the chimney effect is obvious, resulting in the formation of a particularly large vertical direction of the temperature gradient, the heat concentration to the ceiling gathered, and the work area is not up to the design requirements, in addition to the large general area of the tall space, the internal and external heat load difference is also large, such as unreasonable design, will cause the indoor temperature field temperature distribution is not uniform,It affects the comfort level.


	 


	Usually the cooling load composition of tall space: enclosure structure accounts for 8%-27%;Outdoor cold air intrusion load accounted for 9.5-112%;Light heat dissipation accounts for 2.5%-11%, etc.


	 


	The following is an analysis of the characteristics of the energy-saving heating method in the current design of tall space, in order to help the construction unit and design researchers in the selection of heating scheme.


	 


	Recommended heating energy saving scheme: 


	 


	1. Gas-fried radiation heating equipment 


	 


	There are natural gas, liquefied petroleum gas can use gas radiation heating system.High power gas radiation heating equipment is recommended.Because the characteristic of infrared radiation is to penetrate the air but not heat the air, indoor heating speed is fast, the heat distribution is uniform, the body feeling is comfortable and soft.In addition, considering the poor sealing of many factory Windows, the indoor air temperature of gas radiant heating is 2 ~ 3℃ lower than that of convective heating, and the heat consumption is small, and the indoor and outdoor temperature difference is small, so the cold air permeability is also small.So in the tall space than the traditional radiator, radiator and other ways at least 30% more energy saving.


	 


	<img src="http://www.mhsc009.cn/Uploads/image/20230601/20230601103935_23279.jpg" alt="" /> 


	 


	According to the Code for Fire Protection of Building Design, the fire risk category of "all kinds of production using gas, liquid and solid as fuel or burning gas and liquid for other purposes" belongs to Class D.And the heat energy generator is set outside the building, the system performance is very stable, so the use of gas radiation heating will not increase the risk and design difficulty of the building.Clean energy such as natural gas and liquefied petroleum gas is used for heat.At present, gas radiation heating equipment technology is very mature, it is completely feasible to discharge gas directly into the outdoor after combustion, in line with the requirements of environmental protection.


	 


	2. Hot water radiation panels 


	 


	In addition, in the case of heat source (hot water, steam, etc.), it is recommended to use hot water radiation plate.The principle is the same as gas radiation heating equipment, through the radiation plate of special material, the infrared ray is generated, and the heat is transferred directly to the human body and objects in the heating space.Infrared radiation heating, no convection phenomenon, small thermal inertia, no need for a long time to preheat, heating speed.In tall Spaces, reducing vertical gradient heat loss means saving energy and money.


	 


	<img src="/Uploads/image/20230601/20230601104021_85091.jpg" alt="" /> 


	 


	For example, the ECOPAN hot water radiant panel uses an innovative design concept. The pipe, as the warmest part of the panel, is completely downward, and 70% of its surface is covered by a metal plate (covering an Angle of more than 280°), which increases the heat transfer area and ensures excellent heat transfer from the tube to the plate.


	 


	On the safety level, hot water as a heat transfer medium, no electrical equipment, no flammable parts, do not increase the building fire rating.Can be used in volatile and flammable building environment, without the risk of fire and explosion.


	 


	Tall space because of its own architectural characteristics, there are a variety of heating methods for choice.Designers and builders should determine the best and most reasonable heating scheme based on building functions and characteristics as well as municipal conditions.

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Heating design and energy-saving scheme for building with large space