Free air conditioning from neighbors: role for radiant cooling in the tropics?

Hot muggy weather these March mornings, the hot season is moving in to smother us. Wet bulb temperature 27C (81F) all morning. 

I have discussed elsewhere in this book the wonderful after-effect of my condo neighbor's air conditioning: cool walls in my condo that make air conditioning unnecessary for me during the hot afternoons now approaching. This raises some interesting questions, one of them being the possibility of radiant cooling in Bangkok's steamy hot season.

We recognize that the humidity here is very high, with dew points in the upper 20sC (mid 80sF), rare in temperate climates.  If we don't deal with humidity (impractical in most condo/apartment buildings)  and also want to avoid condensation on cool surfaces, a general no-no, we are limited to cooling surfaces at or above the dew point which for the hot spell last early May would mean no lower than 80F:

Bangkok May 2015; red=Tdb, green=Tdp

You might say that an 80 deg (27C) cooling panel is useless, but I will claim that this is an assertion worth questioning in the particular environment we have in the tropics. We plan to reexamine this issue  in some upcoming posts during the coming hot season.