Demo 2 – Bodegas Roda
Processes: heating and cooling oriented to wine fermentation and stabilization.
Site: Haro, La Rioja
Latitude: 42º 35’08.7’’N
GHI: 1,641 kWh/m2@35º
Add equipment: Absorption chiller
Space opportunities: the site has availability of around 100 m2 of rooftop, which is located approximately 100 m away from the plant.
Cooling consumptions of the plant are distributed among the different activities as shown in Figure. It can be noticed that most process cooling requirements are almost constant during the year (except for pre-fermentation and fermentation that are carried out seasonally) whereas space cooling is concentrated during the summer period.
|Monthly demand %||may||jun||jul||aug||sep||oct||nov||dec|
consumption: (1) Malolactic fermentation it is necessary to heat the process with a radiant soil is a glass warehouse of 1.000 m2 at a temperature of 21°C, from the ground up to a height of 1.8 m. (2) Stabilization process consists in cooling the same are house at a temperature of 15°C. The total annual heat consumption is 190.000 kWh (150.000 kWhel for cooling + 40.000 kWhth for heating).
The RODA Wineries demo site is placed beside the Ebro river, in a balcony of the station district of Haro (La Rioja, Spain), on a centenary cellar. RODA’s main activities are winemaking and wine selling. The company manufactures and markets four brands: SELA, RODA, RODA I, CIRSION. From a commercial point of view, RODA markets its products in both national and international markets.
More in detail, the processes identified as suitable for the use of heat produced through solar thermal technologies are distillation, pre-fermentative cold maceration, alcoholic fermentation, malolactic fermentation, wine ageing, cold stabilization, cleaning and disinfection.
Currently, cooling demand is covered by chilled water produced at 7°C and variable pressure depending on the machine involved. Also a secondary system is present. In addition, heating is produced in form of water at 45°C and pressure of 1.5 bar. The system is monitored through a Siemens automaton monitoring system.
The selected processes are responsible of a high percentage of the total energy consumption of the factory. In particular, heating needs are covered using LPG as a fuel and are considered to be constant at monthly and daily scale during the heating period, i.e. from October to March. On the other hand, regarding cooling, the total demand is currently covered by an electric chiller.
In this stage, Sulphur dioxide (SO2) is also added as anti-microbial agent and as an antioxidant, to stop fermentation and protect against oxygen effects. Fining agents are used to remove tannins and microscopic particles that cloud the wine, and to reduce astringency.
Control: The control in the plant is manual and add in an excel file for its analysis. Each day the figures of relativity humidity and temperature are measured.
Conventional FPC + Absorption chiller
Heat Transfer Fluid: Water
Net Aperture Area: 100 m2
Gross Area: 110 m2
Peak power: 74 kW
Gross heat production per year: 75 MWhth
Yearly global efficiency: 54%
CO2 savings: 19.8 tCO2
Heating cost: 5 c€/kWh
Payback: 6-7 year