According to the different installation methods, it can be divided into surface-mounted type and embedded type. The exposed cold beam has high thermal efficiency, but it is limited by the building. Inlaid cold beam is beautiful and generous, but it will reduce the indoor cooling capacity. According to whether there is outdoor air supply, cold beams can also be divided into active cold beams and passive cold beams. Among them, passive cold beam can only cool in summer and not supply heat in winter, which is not suitable for heat pump system; Active cold beam can complete the functions of cooling and heating.
Working Principle The active cold beam system is an air conditioning system with the functions of refrigeration, heating and ventilation, which can provide a good indoor climate environment and control individual areas. Primary air is mainly used to eliminate indoor wet load, and also provide hot, cold and fresh air; The terminal heat exchange coil is used to handle indoor heat/cooling load. In summer, the treated main airflow enters the cold beam, and then enters the lower end of the cold beam through the nozzle. According to the Venturi effect, when the high-speed airflow passes through the barrier, the air pressure near the port above the leeward side of the barrier is relatively low, resulting in adsorption. Due to this effect, the indoor air at the lower end of the cold beam flows upward and is cooled when passing through the heat exchanger. The cooled air is mixed with the main airflow, the temperature is lower than room temperature, and then enters the room to cool the air there. After the same cycle, the indoor heat is taken away by cooling coils, thus achieving the function of refrigeration. There is hot water flowing in the heat exchanger in winter, so the cold beam plays a heating role.
There is usually a condenser plate under the coil of the active cold beam. Once the cold water temperature is lower than the dew point temperature, the condensate pan will collect the condensate.
Passive cold beam system is an air conditioning system with refrigeration and heat exchange functions, and should be operated in conjunction with an independent primary air system. Primary air is mainly used to eliminate indoor wet load and ensure fresh air. The end of passive cold beam relies on the principle of complete natural convection for refrigeration and heat exchange, and the hot air flow rises and the cold air sinks, which will produce circulating air flow indoors. The cold beam system combines the advantages of comfort, low noise, energy saving and low maintenance.
Advantages and disadvantages Advantages: (1) Wide capacity range, high cooling and heating capacity of cold beam.
(2) The installation is simple, and the cold beam equipment can be easily integrated into suspended ceilings made of various materials.
(3) Low noise. Specially treated nozzles can produce maximum effect while keeping minimum noise.
(4) No motor, saving energy.
(5) Adaptability, cold beam equipment can have different lengths and widths, which makes cold beams suitable for almost all suspended ceilings.
Disadvantages: the initial investment is high, and condensed water will be produced if it is out of control. Therefore, how to effectively detect, avoid and control the condensation on the ceiling under refrigeration conditions, and how to deal with the condensate once it is out of control are important issues affecting the development of cold beams. In addition, the application of cold beam air supply system will be limited by the following factors:
(1) When the air tightness of the envelope is poor, it will lead to the infiltration of outdoor hot and humid air, and contact with cold beams may produce condensed water.
(2) Because the coil of cold beam system is dry coil, it is not suitable for restaurants, gymnasiums, swimming pools and other places with large indoor latent heat load and dew condensation risk.
(3) The cold beam system is not suitable for various levels of industrial clean rooms or biological clean rooms, as well as other places with high requirements for indoor air changes.
(4) The cold beam system is not suitable for chemical laboratories and other places with many indoor pollution sources and exhaust hoods.
involve
/link? URL = g 2 yhzmfprcne 45 ig 2 dkbknjp 7 c _ 1 erba 6 oqttezutw-zuu 3 whqebmiegtbs _ hhx zi 2 wfo _ jleimtiz 7 QM jeska