Hang Zhou Dawn Air Conditioning Co .,Ltd.

Offices with high-end, office environment of continuous improvement, air-conditioning system is also more widely deep into daily life. How to make the choice of air conditioning systems work best, in addition to the design is reasonable, but also increasingly become a field engineer in China.
As a central air-conditioning fan condenser coils terminal units, in many widely used in public places, and its main features are as follows:
First, since into the unit, adjust the flexibility. Fan coil units for the third gear speed, and the water system at room temperature according to user settings, adopt automatic control of hot and cold water temperature control valve adjustment, so that the temperature of the room can be adjusted independently to meet different customer needs air conditioning, room no When people use manual or automatic shut off timer, and allows developers to avoid a large investment, facilitate the rolling development, according to the situation of customers opening of stay in different rooms. Thereby reducing overall system operating costs.
More easily control the entire system partition, you can press toward the room, floor, use, use of time is divided into several regions, according to the different needs of customers to partition the control, thus avoiding the wind channel system must focus on the irrational side of the control.
Second, the coil body is small, flexible layout, easy installation, take up less building space, easy with the built-in construction. But how the different needs according to the owners, combined with design drawings to select the better fan-coil applications to practical engineering, the following points should be considered:
1, the cooling capacity of the check
Is usually calculated according to the cooling load to select the products, but should pay attention to the different way of supplying fresh air will lead to cooling coil load is also different. When the fresh air delivered to the room directly through the wall, without heat and moisture treatment, the indoor fan coil cooling capacity = cooling load + load of the new air-cooled; when the establishment of an independent air system, then the indoor fan coil cooling capacity = cold load. Products currently on the market, usually the name of the actual operation of cooling capacity and cooling capacity should be the cooling capacity per unit time × the average running time, which changes the amount of running time or the wind, the cold will affect the amount of the input unit. Therefore, the higher the better is not the name of cold, if only in the selection of units with high cooling capacity, cooling capacity there will be too large, resulting in low starting rate, reduce the number of air changes, temperature gradients increase, will increase the system capacity and equipment investment, to increase air conditioning energy consumption, air conditioning, reduce the effect. So cold equipment only as a necessary condition for selection should also take into account other factors.
2, air flow calibration
Check the main quality requirements according to the room air changes. The smaller the supply air temperature difference, the more air changes, the air quality better, more comfortable, why do some air-conditioned room feel, smell, heart, is the wind does not handle the checking. The name of the fan coil air flow in the barrier of water, the air pressure difference measured zero conditions, so there are some unrealistic elements, so the actual air volume is determined under ideal conditions should this part of the value of wind net, measured by experience, this part of the additional air volume air flow should be accounted for 20-30% of nominal.
3, delivery, return air way
Delivery, return air flow means that the formation of the so-called organization, and its direct impact is reasonable or not air-conditioned room temperature, velocity field uniformity and stability, that is good and bad effects of air conditioning. Reasonably certain the air supply air flow rate required to avoid flow short circuit, in order to guarantee the jet length. The outside wind speed depends on the static pressure, air supply, outlet and other factors. The outside static pressure is too low will result in decreased air flow, lower range, room Enthusiasm, design air flow and the actual running on the curve there is a big difference, it should be based on actual construction layout of the room structure, depth, height, etc., choose mid-range wind, wind speed indicators to select the appropriate fan coil models. Fan coil units currently on the market, all manufacturers of machines outside the calibration of static pressure value is not uniform, quite different, the fact that some sites installed by the dark horizontal group, add a short duct, filter, forward, back style gate resistance is large, so when ordering to determine the actual value selected for the outside static pressure 30Pa, 50Pa and some rooms and even select the unit value of the outside static pressure, the resistance is greater than the conventional value of about 20Pa, so in the actual operation to ensure a good uniform field to achieve the desired effect of air withered.
4, other factors
a. 40dB noise control in the following indicators on the fan coil noise is too large, the installation of silencer processing device, the resistance is not greater than 10Pa.
b. Installation, construction quality and attention to the quality of insulation, condensation water discharge, slope, pipe joints, the system clean.
c. The water level of the system is set up the system or the vertical system, part of the site selection of the vertical system to better ensure the condensate water discharge to ensure that the requirements of the room floors.
In short, a reasonable person in the design and construction, timely coordination with the evaporator coils system would avoid the drawbacks of more use to obtain the combined effect is satisfactory.