Hangeland was replaced at half-time in Fulham's 4-1 win at Palace last season, a result which saw Ian Holloway leave the Eagles.
But the ex-FC Copenhagen man was suitably impressed by the support at Selhurst Park to be excited about turning out for his new side.
"I'm delighted to be here. I look forward to helping out and doing the best I can for this club," he told Palace's official website.
"I'm quite old school as a player, I just want to be part of a good group of players, working for a good manager, working really hard and driving something in the right direction.
"All the people I spoke to told me that's what's going on at Crystal Palace and I really wanted to be a part of that.
"It's a traditional club with a big following. I thought the atmosphere here was fantastic and obviously the fans had a lot to be happy about come the end of the season.
"If we can do something similar to that this season, that would be great. I'm really looking forward to playing in front of those fans as soon as possible."
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