专注通风管道加工·排烟罩

Problem 1: In the kitchen ventilation project, the power consumption of smoke exhaust fan and lampblack purification equipment is large, and the ventilation effect of fan is poor. Cause: All exhaust hood pipes of the overall kitchen are finally concentrated into a large air duct system, and a large lampblack purification equipment and a large fan are used for air exhaust. As a result, as long as the kitchen has a stove to use, the exhaust fan and the lampblack purifier must be turned on. In this way, not only the ventilation effect of the fan is not good, but also the power consumption is large. In high-end hotels, the annual electricity consumption for kitchen ventilation accounts for 2.8% of the total annual consumption.

解决措施：按具体情况分成两、三个系统，或采用变速风机，在高峰负荷时全开。厨房炉灶使用的高峰时间约为4~5小时，而其余时间为加工及准备或卫生时间，不需要大的排风量。

Solution: Divide into two or three systems according to the specific situation, or use variable speed fans, which are fully open at peak load. The peak time for the use of kitchen stove is about 4-5 hours, while the rest of the time is for processing and preparation or sanitation, so no large exhaust volume is required.

问题二：酒店厨房的送风系统采用的是以下几种方式 ：

Question 2: The air supply system of the hotel kitchen adopts the following methods:

1、空气处理方式用了部分回风；

1. Partial return air is used for air treatment;

2、采用了风机盘管；

2. Fan coil unit is adopted;

3、厨房内不设送风系统，而是设了单体冷风机。使用不到一年就效率大减，使厨房温度太高。 原因：这些设备本身均有水冷式表面冷却器或直接蒸发式表面冷却器。厨房内的空气直接与冷却器接触，油雾很快就会污染和堵塞表冷器上翅片的间隙，使其风量大减，致使厨房内温度太高，效果差。

3. There is no air supply system in the kitchen, but a single air cooler. The efficiency is greatly reduced after less than a year of use, making the kitchen temperature too high. Cause: These devices are equipped with water-cooled surface coolers or direct evaporative surface coolers. The air in the kitchen is in direct contact with the cooler, and the oil mist will soon pollute and block the clearance between the fins on the surface cooler, reducing its air volume, resulting in too high temperature in the kitchen and poor effect.

解决措施：在厨房的送新风系统中，不能用回风。只能用直流式系统。根据室外条件可以用直流空调系统，也可为直流送风系统。窗式或柜式空调器在厨房内不宜采用。

Solution: return air cannot be used in the fresh air supply system of the kitchen. Only DC system can be used. DC air conditioning system or DC air supply system can be used according to outdoor conditions. Window type or cabinet type air conditioners should not be used in the kitchen.

问题三：厨房用风机盘管降温失败。厨房内设有炉灶排气系统及新风补充系统，还有风机盘管降温系统。刚投产时，效果挺好，一年之后，温度降不下来，有时达35℃以上，工作人员难以忍受。 原因：经检查了解，发现厨房内油雾、水蒸气均大，特别是煤气燃烧后的油烟附着在盘管表面，使其传热系数大大下降，冷却效果越来越差。

Problem 3: The kitchen fan coil fails to cool down. The kitchen is equipped with stove exhaust system, fresh air supplement system and fan coil cooling system. When it was just put into production, the effect was very good. One year later, the temperature could not be lowered, sometimes reaching more than 35 ℃, which was intolerable to the staff. Cause: Through inspection, it is found that the oil mist and water vapor in the kitchen are large, especially the oil smoke after the gas combustion attaches to the coil surface, which greatly reduces its heat transfer coefficient and makes the cooling effect worse and worse.

解决措施：将风机盘管在厨房内的回风口堵上，再用管道将餐厅的空气引作厨房风机盘管的回风，同时减少室外空气的送入量。（厨房设不能采用风机盘管系统）

Solution: plug the fan coil unit at the return air inlet in the kitchen, and then use the pipe to lead the air in the dining room as the return air of the fan coil unit in the kitchen, while reducing the amount of outdoor air. (Fan coil system cannot be used in kitchen design)

问题四：厨房的煤气灶火苗往灶门外喷，影响正常使用。 原因：厨房内的进风量和排风量比例不当，使厨房的负压过高所致。

Problem 4: The fire of the kitchen gas range sprays outside the kitchen door, affecting normal use. Cause: The proportion of air intake and exhaust in the kitchen is improper, resulting in high negative pressure in the kitchen.

解决措施：设有机械排风系统的厨房，应考虑补充进气。厨房的负压值，不得大于0.5mm水柱。负压过大炉灶会倒风，即炎苗往外喷。为达此目的，一般情况下送风量应为排风量的85%~95%。

Solution: For kitchens with mechanical ventilation system, supplementary air intake shall be considered. The negative pressure value of the kitchen shall not be greater than 0.5mm water column. If the negative pressure is too large, the stove will be downdraft, that is, the inflammation vaccine will spray out. In order to achieve this purpose, the air supply volume shall be 85%~95% of the exhaust volume in general.

问题五：厨房操作间与餐厅之间串问。厨房与餐厅相邻，使人产生不舒服的感觉，使得餐厅的环境质量不够清香幽雅。 原因：厨房及餐厅的气流组织不好，应当是厨房负压，餐厅正压。而有时由于厨房开了窗，造成厨房的空气流入餐厅，以致使两者之间到处串味。

Question 5: The questions between the kitchen operation room and the dining room. The kitchen is adjacent to the dining room, which makes people feel uncomfortable, and makes the environment quality of the high-end dining room not fragrant and elegant enough. Cause: The air flow in the kitchen and dining room is not well organized. It should be the kitchen negative pressure and the dining room positive pressure. Sometimes, because the kitchen has opened a window, the air in the kitchen flows into the dining room, which makes the two smell everywhere.

解决措施：要防止厨房气味倒灌，除了在厨房和餐厅之间要设走道过渡之外，厨房排风量60%要靠餐厅来补。即把厨房补风量的60%送到餐厅，然后再由餐厅流到厨房。但要注意气流由餐厅流入厨房在经过配餐口时的风速不得大于1m/s。

Solution: To prevent kitchen odor from pouring back, in addition to the corridor transition between the kitchen and the dining room, 60% of the kitchen exhaust air volume should be supplemented by the dining room. That is, 60% of the make-up air volume in the kitchen is sent to the dining room, and then flows from the dining room to the kitchen. However, it should be noted that the wind speed when the air flows from the dining room to the kitchen through the food port should not be greater than 1m/s.

问题六：酒店的会议厅有厨房炒菜味道。 原因：厨房的排气出口与空调的室外进风口相距较近，而且进风口是设在排气口的下风向。结果造成进风不清洁，以致把厨房的气味送入建筑物内，造成“串味”。

Problem 6: The meeting hall of a high-end hotel has the smell of cooking in the kitchen. Cause: The exhaust outlet of the kitchen is close to the outdoor air inlet of the air conditioner, and the air inlet is located in the downwind direction of the exhaust outlet. As a result, the air intake is not clean, so that the smell of the kitchen is sent into the building, resulting in "smell".

解决措施：新风进口应设在空气比较洁净的地方，并宜设在排风口的上风侧，且应比排风口低。在民用建筑中尽量避免进风口与厨房排气口设在同一方向。

Solution: The fresh air inlet should be set at a place with clean air, and should be set at the windward side of the air outlet, which should be lower than the air outlet. In civil buildings, the air inlet shall not be set in the same direction as the kitchen exhaust.

问题七：厨房排风机壳内积水，以致结冰，影响使用。 原因：在严寒及寒冷地区，厨房的排风机设于室外，冬天时排气中的水蒸气及油雾凝结，到夜间就结成冰，次日厨房工作时排风机无法启动，甚当炉灶使用时，不但不能排气，而且还有水滴下来。

Problem 7: There is water in the kitchen exhaust fan casing, which causes ice formation and affects the use. Cause: In cold and cold areas, the exhaust fan of the kitchen is set outdoors. In winter, the water vapor and oil mist in the exhaust will condense and freeze at night. The exhaust fan cannot be started when the kitchen is working the next day. Even when the stove is in use, not only cannot exhaust, but also water drops.

解决措施：

Solution:

（1） 注意风机的转向，尽量选用水平出口的离心风机。如果必须选用上出口的风机时，应在风机壳的更下边装一根泄水管，及时装集水泄掉。风机室外部分及风管均做保温。

(1) Pay attention to the rotation direction of the fan, and try to select the centrifugal fan with horizontal outlet. If the fan at the upper outlet must be selected, a drain pipe shall be installed at the bottom of the fan housing, and the water collection shall be drained at the same time. The outdoor part of fan and air duct shall be insulated.

（2） 水平管道要有大于2%的坡度，坡向排气罩方向。

(2) The horizontal pipe shall have a slope of more than 2% towards the exhaust hood.

（3） 排气管道中的速度一般为10m/s左右。

(3) The velocity in the exhaust pipe is generally about 10m/s.

（4）风机更好不设在室外，而设在排风机房内。

(4) The fan should preferably not be located outdoors, but in the exhaust fan room.