Kevin, Ice rink load depends a lot on the building and the environment. Most of the rinks in China are not very efficient. A typical mall rink in Nanjing or Shanghai has an electrical cost of about 1000 RMB/m2/year. A well insulated and properly ventilated dedicated rink building would reduce this by about 50%. You need a cooling capacity between 250 and 500 watts/M2 so you need at least 135 kW cooling capacity and you could need up to 225 kW.
Contact my web site or email if you need some help. I'm in Beijing.