Abstract
The Demand for circulating cooling water (CCW) with high temperature stability and a quick response to temperature control is essential for precision engineering, so a dynamic thermal filtering method is proposed in this paper. Some CCW is bypassed, blocked, and used as a thermal capacity medium, and the temperature fluctuation of CCW is significantly reduced by heat exchanging with the medium. The temperature of the medium dynamically follows the set value of the CCW temperature by real time updating, and so realizes a quick CCW temperature control response. The attenuation ratio of temperature fluctuation was derived, theoretically validating the effectiveness of the method. The experimental results indicate that a CCW temperature fluctuation attenuation ratio of tens of dB (−3.47 dB, −6.91 dB, −10.97 dB and −15.28 dB corresponding to temperature fluctuation frequencies of 0.01 Hz, 0.025 Hz, 0.053 Hz and 0.105 Hz, respectively) is achieved by the proposed method. The updating time of thermal capacity medium is 82 s, which means that the temperature fluctuation attenuation remains functionally valid when the set value of CCW changes. The proposed method is low cost in operation and provides an effective approach to satisfy the challenging demand for CCW with high stability and a good dynamic temperature control performance.
Highlights
In the fields of precision manufacturing, more than 40–70% of machining errors result from thermal deformation of machine tools and work pieces [1], while circulating water cooling is a key technology against thermal pollution
With high temperature stability and quick response of temperature control is found in the fields of lithography, optical machining, and so on [2,3,4,5]
The Circulating cooling water (CCW) temperature fluctuation of frequency lower than 0.005 Hz can be directly eliminated by the temperature closed loop feedback control of the CCW temperature control system
Summary
In the fields of precision manufacturing, more than 40–70% of machining errors result from thermal deformation of machine tools and work pieces [1], while circulating water cooling is a key technology against thermal pollution. CCW flows through another chamber of the heat exchanger, the temperature fluctuation of CCW is reduced by the large thermal capacity of the sealed water [14]. Materials with large thermal capacity, including stainless-steel balls and water, are introduced as the medium, and the temperature fluctuation of water is smoothed by heat exchanging with the medium This method provides a new approach to the high attenuation ratio of water temperature fluctuation. Once the set value of the CCW temperature is changed, the attenuator is functionally invalid, and becomes a thermal interference source, which means that the method is only applicable for water cooling applications that demand CCW of constant temperature. Temperature fluctuation attenuators using phase change material (PCM) as thermal capacity medium [16,17,18,19,20] are proposed and attract much attention.
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