Second hearing. Whenever the Zoning Hearing Board, after hearing all the evidence presented upon an application or appeal, under the provisions of this chapter, denies the same, said Board shall refuse to hold further hearings on the said or substantially similar application or appeal by the same applicant, his successor, or assign for a period of one year, except and unless said Board shall find and determine from the information supplied by the request for a rehearing that changed conditions have occurred relating to the promotion of the public health, safety, convenience, comfort, prosperity, and general welfare, and that a reconsideration is justified.