【文章內(nèi)容簡介】 trial engineering and construction. Solcar subcontracted the construction of the PS10 plant to Abener Energ237。a, ., a firm that is one of Abengoa39。s subsidiaries and focuses on construction. In turn, Abener subcontracted the design and construction of the solar tower to Alternativas Actuales de Construcci243。n . (ALTAC), of Madrid, Spain. ALTAC specializes in designing and constructing industrial chimneys and tall concrete structures. At the beginning of the project, the tower design was not established. Therefore, it was necessary to assess all requirements to define a suitable, feasible, and attractive solution. For example, the tower had to support various types of large, heavy equipment: ? The solar receiver prises four interchanger panels that are 5 m wide and 12 m high. Covering an arc of 180 degrees and located on the tower at an elevation of 100 m, the receiver has a total weight of metric tons. ? A 15 m long steam drum is used to collect the steam, which drives the turbine. with a total weight of metric tons, the drum is situated atop the tower m aboveground. ? Four pumps below the receiver are needed to pump up water. weighing a total of metric tons, the pumps are located at an elevation of m. ? A 5 m long reheater with a total weight of metric tons is located m aboveground. ? A 3 m long degasifier weighing metric tons is located at the same elevation as the reheater. ? Ductwork and pipes for water and steam, distributed among several platforms, have a total weight of 176 metric tons when full. ALTAC Beginning at an elevation of 100 m, an opening extends m in width and m in height to enable the sun39。s reflected rays to reach the receiver. 沈陽建筑大學(xué)畢業(yè)設(shè)計 外文翻譯（附一、附二） 11 The architectural design also had to be carefully considered during the design stage. recognizing that the solar tower would be a remarkable project in the renewable energy sector, the client wanted to have a unique, memorable structure. Furthermore, the city council of Sanlcar la Mayor was concerned about the power plant39。s visual obtrusiveness and opposed a massive concrete tower. Project participants realized that school groups and other members of the public would want to visit the site as part of guided tours. Because it affords a superb view of the heliostat field, the tower was seen as an ideal location for installing viewing platforms for visitors. However, allowing visitors inside the tower made it necessary to install an elevator and a system for double independent access— that is, a ladder and a stairway— for safety reasons in the event of a fire, a plant failure, or some other emergency. Taken together, these requirements constituted a new engineering and architectural challenge, as no similar structure had ever been designed. Therefore, the tower39。s design had to be executed from scratch. Abener Energ237。a decided to split the tower into two main packages: equipment and civil works. The equipment package was awarded to the energy efficiency and renewables division of Madridbased T233。icas Reunidas, monly known as Teical. Because it does not specialize in designing concrete structures, Abener Energ237。a asked several panies in the concrete chimneys market to bid on the civil works package. ALTAC was awarded the civil works package even though no architect had been involved in developing the proposed tower design. Since the specifications were quite loose with regard to architectural design, the bidders had to propose certain solutions. ALTAC presented several preliminary designs to the client with different levels of service, aesthetic sophistication, and construction difficulty. The different designs depended on, for example, whether a straight or a tapered geometry was required and whether external or internal platforms were desired. each design was named according to its shape. For example, the various tower shapes suggested a cylinder, a wine glass, a telemunications tower, and a torch. The design ultimately chosen by the client was a doubleshaft straight tower. In plan view, the tower is a trapezoid with rounded corners, the longer side, measuring m in length, located to the north, and the shorter side, m in length, located to the south. Two internal walls perpendicular to the tower39。s parallel sides divide the structure into three main areas, referred to as the east, west, and central shafts. This trapezoid shape is adapted to the geometry of the solar receiver, whose panels cover an arc of 180 degrees. with this nonaxisymmetric shape, the tower seems to be looking north to the heliostat field. The east shaft houses an elevator that extends to the pump platform, along with a stairway leading to the solar receiver level. The west shaft houses the preheater and the degasifier. In the 沈陽建筑大學(xué)畢業(yè)設(shè)計 外文翻譯（附一、附二） 12 event of fire, the west shaft also provides an alternative means of egress by way of steel service platforms and ladders situated at 10 m intervals. From the front, the solar tower resembles a twinedged blade distinguished by three welldefined areas. Completely closed because of structural requirements, the lowest part of the tower supports the visitor platform at an elevation of m. Beginning at the visitor platform and continuing upward to an elevation of m, the internal walls form two independent shafts, the space between them being open. The shafts are used for such purposes as access, service, equipment placement, and maintenance. From the outside, the top of the tower appears similar in form to the base. However, the top is fundamentally different in that it has no internal walls. These walls were removed to allow enough space for the solar receiver to be installed. Obviously, an opening was required in the north wall to enable the sun39。s reflected rays to reach the receiver. Beginni