For people with respiratory disorders who need additional oxygen therapy, oxygen
concentrators are vital medical equipment. By concentrating oxygen from the ambient air …

Hospitals are institutions that require a large and continuous supply of energy to run their
operations. Using of intensive energy can have a significant impact on the environment and …

Chronic obstructive pulmonary disease results from a collection of lung illnesses that restrict
air ow, causing breathing di culty. Pulmonary brosis result from scarring of the lung tissue …