Heat Pumps can be used in several industrial processes. Industrial plants have both waste heat flows and heat consumers. Waste heat flows are for example: waste water, hot humid air, condenser heat from refrigeration systems, etc. Heat consumers are process water, central heating systems, blanchers, dryers, etc.
In complex industrial applications, a pinch analysis may be performed to assess the suitability of waste heat integration. For processes that are less complex, the method described below will help in forming a decision.
Identify all heat consuming processes. For waste heat sources as well as potential waste heat consumers the following information must be collected:
2. Direct heat exchange
For waste heat flows with higher temperatures than their potential users, direct heat exchange is possible. In this situation a heat pump is not needed to transfer the heat.
3. Using a heat pump
Waste heat flows with a temperature level lower than the heat consumers do not offer a possibility for direct heat exchange. It may then be an interesting option to upgrade the temperature level using heat pumps. The efficiency of the system will depend on the temperature levels, power and hours of operation. You may use our feasibility check to determine the feasibility of using a heat pump.
Thus, the use of a heat pump serves two purposes - heat the dryer and dehumidify and recirculate air. Heat pump assisted drying can give high efficiencies because of this. This innovative heat pump application has been realised in practice; the heat pump for drying of fries.
Read more about drying processes.
Heating of process water with waste heat from a refrigeration system