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A comparison of the air-side heat transfer coefficient of the present polymer heat exchanger with some of the commercially available plain plate fin heat exchanger surfaces suggests that its performance in general is superior to that of common plain plate fin surfaces .
 concept or principle: heat transfer; material: polymer; machine or equipment: heat exchanger; machine or equipment: heat exchanger; concept or principle: performance; concept or principle: surfaces
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: heat transfer; material: polymer; machine or equipment: heat exchanger; machine or equipment: heat exchanger; concept or principle: performance; concept or principle: surfaces