Common use of Availability Guarantee Clause in Contracts

Availability Guarantee. Before starting the Energy Production Guarantee Period, the contractor EPC will deliver a Theoretical Production Model which will have the following hourly input data: • Meteorological conditions: Direct normal radiation, ambient temperature, relative humidity and wind speed. • Number of collectors in service/operative. • Number of collectors in solar tracking, both total and partial. Note that the hourly data to be entered into the model will be the average values of measurements taken at least every ten (10) minutes. The output data from this Theoretical Model will be the variables necessary to determine the availabilities of both the Field of Parabolic Cylinder Collectors and the Power Block. Both availabilities will be calculated as indicated in the following sections: (a) The availability of the Field of Parabolic Cylinder Collectors will be calculated in accordance with the following methodology: Whenever the hourly direct normal radiation exceeds a given threshold, the value of Collectors in service will be recorded. The average of these values weighted with the modified direct radiation will correspond to the value of availability of the Field of Collectors. The threshold of direct normal radiation will be determined by the absolute error value of the pyrheliometer used, increased by a security factor. In general, the threshold value of direct normal radiation will be set at 50 W•h / m2. In addition, days with accumulated direct normal radiation of less than 2 kWh/(m2 • day) will be eliminated, as these will be considered non-operation of the plant. The Collectors that can be put into automatic mode from the control system will be considered in service. In this way, the number of Collectors in service will be identified by the control system. There will be a variable in the control system to record the number of Collectors in service. The modified direct radiation represents the effective incident radiation on the Collectors. Therefore, the availability will be evaluated in accordance with the energy captured. The modified direct radiation will be determined by multiplying the direct normal radiation by the cosine of the angle of incidence of the sun’s rays. The cosine factor will be determined by the Theoretical Model. Following the methodology indicated above, the availability of the Field of Collectors will be calculated by means of the following expression: Where: