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近几年来,随着通讯机器的现代化发展,使这些设备的发热量趋于集中化即所谓“高发热率化”,程控电话机房的单位面积发热量达500～600大卡/时。因而在有些地方产生了冬季在机房内亦需提供一定冷量的问题。用直接采自室外的新风供冷(全新风)方式会带来加湿控制、新风尘埃、有毒气体等对设备的影响,用与夏季同样方法运行风冷空调机组时,从节能和调节(室外空气温度过低,冷剂系统压力调节困难,使运行的稳定性降低)来说都不合理。因此,可在冬季时利用制冷系统的室内、外侧的换热器进行冷剂自然循环。借以获得少量和稳定的冷量。利用这种考虑对于柜式空调机组、离心式制冷机,以及大型空调建筑物都可以应用。
In recent years, with the modern development of communication machines, the calorific value of these devices tends to be centralized, the so-called “high heat rate”, and the programmed telephone room heats up to 500 to 600 kcal / hour. As a result, there was a problem in some places that a certain amount of cooling capacity should also be provided in the engine room in winter. The use of fresh air directly from the outside (fresh air) will bring humidification control, fresh air, toxic gases and other equipment on the impact of the same method with the summer operation of air-cooled air conditioning unit, from energy saving and conditioning (outdoor air The temperature is too low, the pressure of the refrigerant system is difficult to adjust, and the stability of the operation is reduced) is not reasonable. Therefore, it is possible to utilize the indoor and outdoor heat exchangers of the refrigeration system for the natural circulation of the refrigerant in winter. In order to obtain a small amount and stable cold. Taking advantage of this consideration for the cabinet air-conditioning units, centrifugal chillers, and large air-conditioned buildings can be applied.