Question: what kind of heat transfer is a fan
[{'answer': 'forced convection', 'provenance': [{'wikipedia_id': '184726', 'title': 'Heat transfer', 'start_paragraph_id': 3, 'start_character': 503, 'end_paragraph_id': 3, 'end_character': 520, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '184726', 'title': 'Heat transfer', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 610, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 966965797055979572}, 'section': 'Section::::Abstract.'}]}]