DISTRICT HEATING AND COOLING WITH LARGE CENTRIFUGAL CHILLER-HEAT PUMPS
With prices for primary energy resources soaring, the recovery of "waste energy" is getting into the focus of attention. The global climate change reminds us to limit the use of primary energy resources to a minimum, thus exploiting "waste energy" potentials wherever feasible. The process of upgrading low grade waste heat is especially interesting where large amounts of such energy are available at one point. This is for example the case in sewage treatment plants, alongside main sewers or at the smoke stacks of waste incineration plants using wet type flue gas cleaning. In all this cases, large amounts of valuable high grade heating energy can be produced with a minimum input of primary energy. Even if the "waste energy" potential is abundant and easily exploitable, the aspect of overall thermal efficiency is considered crucial for the final decision to invest in large heat recovery installations.