Abstract: In recent years, in response to the call for energy conservation and emission reduction, the air source heat pump systems have been widely applied in regional centralized heating engineering.However, due to the existence of cold island effect, the heat pump unit operation in winter has the problems of low efficiency, high operation cost and insufficient production.This paper takes the heat source station combined with gas source heat pump and electric boiler as an example, and its heat pump unit array was simulated and calculated by analyzing relevant test data and using the numerical calculation method. Some technical measures were put…forward to improve the cold island effect, and then the advantages and application scope of these measures are also analyzed.
Show more
Keywords: Air source heat pump, regional heat supply, cold island effect, numerical simulation, technical measures
Abstract: Purpose: There is no consensus as to the optimum treatment for traumatic optic neuropathy (TON). The decision to intervene medically or surgically, or simply observe was recommended to be on an individual basis. The purpose of this study is to test whether optic nerve sheath fenestration (ONSF) could improve vision in patients with traumatic optic nerve sheath meningocele, although it was reported to be effective in patients with traumatic optic nerve sheath hematoma. Methods: ONSF was performed on two traumatic patients with dilated optic nerve sheath from MRI. Results: Both patients initially suspected as traumatic optic nerve sheath hematoma were…diagnosed as traumatic optic nerve sheath meningocele by intraoperative findings of the enlarged optic nerve sheath and clear fluid drained without evidence of blood in the subdural space. Moreover, significant orbit/head pain resolution and visual improvement within a week after ONSF was found. Conclusions: When TON presents with an enlarged optic nerve/sheath on CT or MRI with visual loss, an optic nerve sheath meningocele should be considered with the consideration that ONSF may benefit both visual acuity and post-traumatic pain, if present.
Show more