The kitchen of the hotel produces a lot of oil smoke, carbon dioxide and water vapor during thermal processing, and the indoor air is turbid. At the same time, the stove radiates a lot of heat, and the room temperature is very high in summer. It is very hard and harmful for the chef to work under high temperature and oil fumes for a long time. When designing the kitchen in the hotel, we must take ventilation and exhaust as important problems' and try our best to solve them, and at the same time, we should prevent the kitchen fume from polluting the restaurant. At the stage of scheme design, the ventilation and exhaust problems should be solved from the plan and section design, and the main measures are as follows:

1. Hot working rooms should strive to open side windows on both sides, so as to form through flow

through flow's air exchange rate is twice as high as that of the exhaust skylight. When the temperature difference between indoor and outdoor is small in summer, through flow will form the maximum possible air exchange, far exceeding the air exchange rate in other ways. When one side of the airflow comes, on the windward side and the leeward side, respectively. When using natural ventilation, the side window area should not be less than 1/11 of the ground area, and it should be easy to open, otherwise the ventilation effect will be affected. If you can't open windows on both sides, you should also try to have windows on one side to ensure ventilation.

2. skylight exhaust

large and medium-sized kitchens should be equipped with skylight exhaust, and if necessary, fans can be added to the skylight to improve the ventilation speed. The skylight should be properly arranged. When the skylight is arranged on one side, it should be directly arranged above the stove, so as to directly eliminate the waste gas and waste heat. Otherwise, the waste gas will be slowly discharged from the skylight after permeating the whole room, and some dead corners under the ceiling will form local circulation, which will last for a long time. When the skylight is arranged in the middle, an exhaust hood should be set above the stove to guide the exhaust gas to be discharged in the vicinity of the birthplace to avoid permeating the whole room. At this time, the skylight is mainly used for the comprehensive ventilation of the kitchen. Skylights should be opened towards the dominant wind direction, and wind shields can be set on the outside to ensure smooth exhaust in any wind direction outside. The lower part of the exhaust hood should be provided with a drainage groove to avoid food pollution caused by condensed water droplets.

3. Set up an exhaust duct or mechanical exhaust

Generally, there is an exhaust hood above the stove, and the exhaust gas collected by the exhaust hood is usually discharged by the hotel design company in two ways: a fan or an exhaust duct. Under the action of a large amount of oil smoke, the fan will soon be covered with oil dirt, and the blade resistance will be large, which will affect the exhaust effect. The exhaust duct is equivalent to the principle of chimney, which uses the height difference and temperature difference between the air inlet and the air outlet to exhaust the exhaust gas. It has the advantages of large pumping force, fast exhaust, no need for maintenance and replacement, stable long-term use effect, no noise and no energy consumption. Generally, the flue and chimney are combined by two sandwich walls. The chimney and flue are separated by different airflow routes in the sandwich walls. The lower opening of the chimney is at the candle, while the lower opening of the flue (exhaust gas inlet) is above the stove and within the range of the exhaust hood. The shaft of the two should not turn, and it is best to go straight to the roof, and its exhaust port should be more than 1m higher than the roof or skylight to ensure the pumping force.

4. Separate the baking room from the steamed rice room

The baking room has an open flame, which has a large amount of heat radiation, while the steaming stove emits a large amount of steam, both of which have great influence on other processing parts. If it is separated into small rooms and the exhaust gas is directly discharged by mechanical exhaust, the influence on other processing parts can be greatly reduced. For the workshop with large steam volume, measures should be taken to prevent condensation (such as roof insulation), and the condensed water should be drained well.