2007_1015_Packet - Laserfiche WebLink

Home

Roseville Skating Center and City Hall Feasibility Study September23, 2007 1. INTRODUCTION 1.1. Background The City of Roseville operates a skating center that includes an outdoor speed skating oval and an indoor ice arena / banquet facility. Located adjacent to the skating center is the Roseville City Hall and Public Safety Building, the Public Works Building and Fire Hall, creating what is referred to as the "City Hall Campus". The refrigeration system for the indoor ice arena is designed with a"direct-expansion" R22 refrigeration plant. Liquid R22 refrigerant is pumped directly through copper piping in the ice floor by the refrigeration compressors, where thermal energy in the ice evaporates the refrigerant. The system contains approximately 6,000 to 8,000 pounds of refrigerant. R22 refrigerant is classified as an HCFC refrigerant and is being phased out of production because of the potential for damage to the ozone layer in the atmosphere in the event of a leak. The ice arena has been in operation since 1969. Because of the age of the refrigeration equipment and the phase-out of the type of refrigerant used in the system, the City of Roseville is replacing the refrigeration system in 2008. Two options are being considered for the replacement of the refrigeration system. One option is to replace the direct expansion refrigeration system with a conventional refrigeration plant that circulates a secondary coolant through a new piping system that will be installed in the rink floor. The second option is the installation of a refrigeration system integrated with the heating, ventilation and air conditioning (HVAC) system and a ground heat exchanger (GHX) The electrical consumption of the ice arena and the speed skating oval totaled approximately 1,805,000 kV�F7 over the last two years at an average cost of $131,800 per year. Most of the electricity is used to refrigerate the ice surfaces for these facilities. Natural gas is burned to provide space heating and domestic hot water in the fce Arena ! Banquet Hall facility, and to provide hot water to flood the ice surface on the oval. An average of 36,600 CCF of natural gas was consumed over the last 2 years at an average annual cost of $40,700. In addition to the ice arena and the speed skating oval, the other buildings on the City Hall Campus also consume significant amounts of energy. The City Hall / Police Station, the Maintenance Garage and the Fire Hall use an average of 1,490,000 k� annually at an average annual cost of $99,200. Natural gas consumption in these three buildings averages 72,300 CCF annually, at a cost of $75,400 per year. 1.2. Purpose and Scope The City of Roseville has retained the services of Geo-Xergy Systems Inc. (Geo-Xergy) first to investigate the feasibility of integrating the heating, ventilation, air conditioning (HVAC) system in the Ice Arena / Banquet Hall with the proposed new refrigeration system when it is replaced. Secondly, Geo-Xergy has been asked to investigate the feasibility of integrating the refrigeration system with the mechanical systems of several other buildings on the City Geo-Xergy Systems Page 1 of 33