摘要
提出了一种新的冷媒水与海水在海中进行换热的方案。将自来水作为冷媒水,通过输水管道送入设置于海中一定深度的换热单元,与次表层海水换热后通过地下含水层输送到用冷区域。在不同管径和流速的情况下进行的热力学计算表明,流速较小、管径较小时单管换热情况较好;在满足总供冷量一定的条件下,换热管径为0.7m、流速为0.1m/s时总输水耗功及总管长最小。与陆上换热方案相比,海中换热方案能够应用于盐度较高的海区,减少输水耗功,提高海水的冷量利用率。
A new heat exchange scheme with working units in certain depth of the sea is put forward. By exchanging heat with subsurface layer of seawater, chilled water is generated and then supplied to buildings in coastal city so that the electric power consumed in the air-conditioning systems can be reduced. Tap water was selected as cooling medium which transfers heat to the cold seawater and passes through underground aquifer to the customers. Thermal dynamical calculations for different tube diameters and water flow rates showed that small tubes and low flow rate are preferred in single tube＇s heat exchange. In order to meet the total load＇s demand the flowing water at 0. 1m/s in the tubes of 0.7m diameter is the optimal design, which minimized the total length of tubes and consumed power of pumps for frictional resis- tance. The heat exchange scheme with working units in the sea can be used in a saltier sea area. It consumes less energy in water transferring and makes more use of cold seawater compared to the onshore one.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2008年第9期1057-1062,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金项目(50278052)
关键词
次表层海水
区域冷源
海中换热方案
subsurface layer of seawater
district cooling resource
heat exchange scheme with working unit in the sea
