In this era of air-conditioning popularization, people are enjoying the coolness and warmth while suffering from the trouble of this air-conditioning, that is, air circulation. Therefore, the ventilation inside the room is a problem that people are very concerned about at present. If you want to ventilate and enjoy the effect of air conditioning, you need to use the Wuhan full heat exchanger at this time. I do n’t know about heat exchangers, so how do you choose a full heat exchanger? Today I will introduce some experience in the selection of a full heat exchanger.
How to choose a full heat exchanger─What is a full heat exchanger
The full heat exchanger may be relatively unfamiliar to everyone. If you call it a ventilator, you may be familiar with it. It is true that the full heat exchanger is an evolution of the heat exchanger.
The basic principle of a full heat exchanger is that the full heat exchanger is a replacement of indoor and outdoor fresh air and old air through its own motor. When the product is working, the indoor exhaust air and fresh air flow through the core of the heat exchanger in a crosswise manner. Due to the temperature difference and steam partial pressure difference between the airflow on both sides of the airflow separation plate, the two airflows present a heat and mass transfer phenomenon when passing through the separation plate, causing a total heat exchange process. In the replacement process, the air is filtered to remove harmful substances such as dust, haze, bacteria and other macromolecular substances in the air, which can ensure the cleanness of the air coming in, so that people in the room can breathe while enjoying the air conditioning effect. To clean air. Another effect of the full heat exchanger is energy saving. During the replacement process, because of its own filtration and heat recovery functions, it obtains cold energy from the air conditioning exhaust during the summer to reduce the temperature; during winter operation, fresh air is obtained from the air conditioning exhaust. Heat and temperature rise. Therefore, the indoor heat recovery can be talked about when the indoor exhaust gas is discharged, thereby achieving the energy saving effect.
How to choose the total heat exchanger ─ see efficiency
The total heat exchanger has two parameters: temperature efficiency and enthalpy efficiency, which respectively describe the effects of heat exchange and humidity exchange in the total heat exchanger. The higher the efficiency, the better the natural energy saving effect. According to the "Indoor Air Quality Standards" and "Public Building Energy-Saving Design Standards", when a centralized exhaust system is installed in a building and meets one of the following conditions, the rated heat recovery rate of the exhaust heat recovery device should not be less than 60% . Honeywell's total heat exchanger has a thermal efficiency of up to 85%, and it has excellent energy saving effects.
How to choose the full heat exchanger ─ see the environment
All wards, gyms, cinemas, department stores, offices, computer rooms, etc. are selected according to the amount of smoking. The fresh air volume required by each person is 17-42, 8-20, 8.5-21, 25-62 , 45-100, smoking venues, restaurants, guest rooms, meeting rooms, etc., each of these places requires 20-50, 30-75, 50-125 fresh air, in these places you can choose the heat exchange efficiency The higher total heat exchanger type, you can calculate based on these data, and then select the type.
How to choose the total heat exchanger ─ fresh air volume
This air volume is determined based on the area used. The actual area inside the suite * layer height * ventilation times = required air volume. According to national standards, a room that needs fresh air should have 0.5 to 2 air changes per hour. If the area of the room is 30 square meters, the floor height is 2.7 meters, and the air change frequency is calculated as 1 time per hour, then this The required fresh air volume of the room is 81m3 / h; in public buildings or indoor environments with dense personnel, the calculation method based on the per capita fresh air volume is more suitable. The normal calculation of the per capita fresh air volume is 30m3 / h. If there are two people in the room, The calculated air volume is 3 / h * 2 = 60m3 / h of fresh air volume.
How to choose the total heat exchanger ─ look at the external pressure of the machine
The external pressure unit is Pascal Pa, which is a pressure unit. This parameter is related to the designed duct. The so-called external pressure is the pressure at the air outlet of the total heat exchanger. The larger the external pressure is, the longer the air supply distance is. However, the excessive external pressure will make the wind speed at the air outlet too large to form a bad experience. It is necessary to choose a suitable external pressure or to equip with an extra fan. In addition, the right angle, tee and other parts of the air pipe will consume a part of the external pressure of the machine, which should also be considered when selecting the type.
With the improvement of our living standards, the air requirements are definitely higher and higher, so it is necessary to understand some situations of the selection of the total heat exchanger. I hope the content introduced today can help you!