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Table 4

Percentage of generated and used energy on the farm, in one year during period III, with renewable energy resources and the use of appropriate technologies (IAFRE), measuring its equivalent in Megajoules (MJ) and the energy cost in kWh, if this energy was supplied from imported electricity. DOI: https://doi.org/10.1525/elementa.324.t4

Appropriate TechnologyUsesDescriptionConsumption resulted in kWh/yearEquivalent MJ1

 
Efficient wood-burning stove For cooking and drying food, heating water. At a daily rate of 50 kWh2 18,250 65,700 
Anaerobic digestor Production of organic compost and biofuel for cooking and drying foods, refrigeration, electricity Daily consumption of 6 m3 of biofuel is equivalent to approximately 6 kWh (Hilbert, 2003; Cepero et al., 2012) 13,140 47,304 
Hydraulic ram Water supply At a daily rate of 12 kWh during seven months of the year, 24 hours a day (June to December).3 2,568 9,244 
Wind Mills Water supply At a daily rate of 1 kWh a day during the remaining five months of the year; four hours average/day (January to May). 151 543.60 
PAFRE Water supply, energy for cooking drying foods, refrigeration and light. Potential used from the renewable energy (FRE) with the appropriate technologies 34,109 (9,45 kWh/day) 122,792.40 
Consumption of external energy. Electricity of the home This refers to the energy imported in this period, equivalent to the consumption of electricity in the house.4 6,660 (18,25 kWh/day) 23,976 
DES PAFRE + Consumption of energy outside the system Total demand of energy in the system (DES), having in mind the consumption in kWh that would imply supplying the energy that is used on the farm with the FRE and appropriate technologies (PAFRE) and the external consumption. 40,769 146,768 
IAFRE  IAFRE = (PAFRE/DES) × 100 83,66% 83,66% 
Appropriate TechnologyUsesDescriptionConsumption resulted in kWh/yearEquivalent MJ1

 
Efficient wood-burning stove For cooking and drying food, heating water. At a daily rate of 50 kWh2 18,250 65,700 
Anaerobic digestor Production of organic compost and biofuel for cooking and drying foods, refrigeration, electricity Daily consumption of 6 m3 of biofuel is equivalent to approximately 6 kWh (Hilbert, 2003; Cepero et al., 2012) 13,140 47,304 
Hydraulic ram Water supply At a daily rate of 12 kWh during seven months of the year, 24 hours a day (June to December).3 2,568 9,244 
Wind Mills Water supply At a daily rate of 1 kWh a day during the remaining five months of the year; four hours average/day (January to May). 151 543.60 
PAFRE Water supply, energy for cooking drying foods, refrigeration and light. Potential used from the renewable energy (FRE) with the appropriate technologies 34,109 (9,45 kWh/day) 122,792.40 
Consumption of external energy. Electricity of the home This refers to the energy imported in this period, equivalent to the consumption of electricity in the house.4 6,660 (18,25 kWh/day) 23,976 
DES PAFRE + Consumption of energy outside the system Total demand of energy in the system (DES), having in mind the consumption in kWh that would imply supplying the energy that is used on the farm with the FRE and appropriate technologies (PAFRE) and the external consumption. 40,769 146,768 
IAFRE  IAFRE = (PAFRE/DES) × 100 83,66% 83,66% 

1 One kWh is equivalent to 3,6 MJ (Funes-Monzote, 2009).

2 The calculation was based on four 1500 watt burners that were used ten hours a day on average for carrying out all the tasks, that the efficient wood-stove built on the farm does, cooking, drying, oven use, heating water, among others.

3 In the case of the hydraulic ram and windmills, the calculation was based on the energy in kWh that an electric turbine with (500 watt) horsepower would use to supply the amount of water presently supplied with those technologies.

4 The consumption per capita of the members of the family of the Del Medio farm is of 2.28 kWh/day, that is equivalent to 39.1% of the average daily consumption per capita kWh/of Cuban clients in their homes (5,8027 kWh/día (ONEI, 2015)).

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