PEA Ammonia Project
The project will be the retrofit of Ammonia Refrigerant plant inside the Phillips Exeter Academy Boiler House. The retrofit will consist of the demolition and removal of four reciprocating refrigerant compressors (three electrical drive and one steam drive), a refrigerant receiver, Rink chiller, river water condenser and dehumidification chiller. Also the dehumidification and rink chiller waterside circuits will be impacted as the chiller interconnect piping and pump sets are demolished and removed. During this process of demolition it will be necessary to recover and store primary (Ammonia) and secondary refrigerants (Brine) for reuse (Two Trailer Tanker Trucks will have to be rented for retention of the hazardous fluids during construction).
The new plant capacity will be 430 tons of refrigeration. The project will consist of the design, procurement, and installation of three new rotary-screw compressors, a compressor sound-enclosure, a new rink chiller, and a new dehumidification chiller. Additionally the project will include design, procurement, and installation of two new dehumidification pumps and two new rink pumps, as well as new piping and brine isolation valves. Some miscellaneous additional components that will be required are a refrigerant receiver, brine-mixing tank, expansion tanks, Brine mixing tank, new process instrumentation, a new gas detection system, and ventilation fan. Some additional concrete will be added for new equipment foundations, and a new steel support system in the basement of the Ammonia Plant. The project also will include the installation of a new control panel designed to interface the compressors, chillers, and condenser into an integrated control architecture.
The project basis includes the re-use of the existing (recently installed) evaporative condenser, make-up water tank, make-up water pumps, and the existing equipment foundations (compressors and chillers).