Cel The aim of the project is to demonstrate that it is technically possible and economically advisable to completely satisfy the heat requirements of a malt production unit by recovering low temperature gas exhaust through exchangers and heat pumps.Despite the ambitious reheating temperature (85 deg.C) and the complex technology required, the heat pump installation has proved highly reliable and simple to operate. The technique could easily find application in other malthouses or in other industries where low temperature waste gases are discharged and there is a need for low-grade heat.The project covers the heating of the air used to dry malt by recycling the low temperature exhaust gases generated during the drying process.The malt drying (or toasting) process lasts approximately 20 hours and takes place on two different levels. The air enters the lower part of the drying tower at 60 to 85 deg. C. and leaves the top part at 28 deg. C. The original system contains a static heat exchanger consisting of glass tubes to partially recycle the heat contained in the system. The novelty described by this project is the extension and completion of the recycling by means of a heat pump. The heat pump has two stages, stage 1 operating with R-12 (fluocarbon refrigerant) and stage 2 operating with R-114. Stage 1 heats the air up to 60-65 deg. C. and operates only in the early part of the drying process. Stage 2 operates only when a higher temperature is required and can bring the air up to 85 C. Both stages are controlled automatically. The heat pump evaporator is heated by the exhaust gases after they have been through the static heat exchanger while the heat pump condenser heats the incoming fresh air after it has entered the tower through the static heat exchanger.This invention enables a saving of approximately 73 % of the total energy required to heat the air during a full malting cycle. This is equivalent to some 1,000 TOE/yr.The compressors of the heat pump are driven by electric asynchronous induction motors and the unit is designed to supply 5.000 Therms/hour with an average C.O.P of 3.7. Program(-y) ENG-ENALT 1C - Programme (EEC) of financial support for projects to exploit alternative energy sources, 1979-1984 Temat(-y) 1.6 - INDUSTRY Zaproszenie do składania wniosków Data not available System finansowania DEM - Demonstration contracts Koordynator CHANTIERS DE L'ATLANTIQUE Wkład UE Brak danych Adres B.P. 400 44608 Saint-Nazaire Francja Zobacz na mapie Koszt całkowity Brak danych
