Alternative 1is a ombined Heat and Power System. The combined Heat and Power System, also known as the cogeneration system, is an integrated mechanical system, which simultaneously generates and utilizes heat and power. The majority of buildings in the world use the SHP system, which is known as the separate heat and power system, due to its low initial cost. The SHP system generates heat and power separately by implementing both power plants and heating equipment. The Northfield Mental Healthcare center also uses the SHP system, consequently with the high output of electricity and gas consumption.
A lot of healthcare facilities with high heating and cooling demands use the CHP systems. The CHP system in a healthcare facility reduces a significant amount of electricity and gas consumption by generating energy sources on-site, instead of buying them from energy companies. In addition, since water is used as the refrigerant, there are no harmful chemical pollutants emitted when using the CHP system.
There are various components of CHP systems, but a typical CHP system consists of mechanical conversion equipment, a prime mover, and a heat recovery system. A prime mover converts fuel energy into mechanical energy and sends the energy to the mechanical conversion equipment. The mechanical energy is then transferred to the mechanical conversion equipment and converted into power. Heat rejected from the prime mover is moved to a heat recovery system and converted into useful thermal energy. The overall efficiency of the system highly depends on the type of prime mover used for a system.
A simple calculation will be performed to see if the CHP system has more potential to be a favorable payback for the Northfield Mental Healthcare center, as well as to see which type of prime mover will be appropriate for the system.
Alternative 2 is the Combined Heat, Power, and Cooling (CHPC) system, also known as the tri-generation system. With the similar manner of the cogeneration system, the same on-site energy-generating module will be used for the tri-generation system. The major difference between cogeneration and tri-generation is the usage of thermal energy output from the CHP module. While the thermal energy from the CHP module will be used for the heating process for the cogeneration system, the thermal energy from the CHP module will be used for the cooling process for the tri-generation system.
The tri-generation system utilizes energy in three forms: electricity, heat, and chilled water. However, the tri-generation system requires cooling equipment, which uses hot water or heat as a source, such as steam fired absorption chillers or hot water fired absorption chillers. Various types of absorption chillers that can be used along with the CHP module will be studied to see which type of absorption chillers provides a maximum efficiency of the entire system.