Millennium Electric T. O.U. Ltd.

P. O. Box 2646, Raanana 43650 Israel

Phone : 972-9-7439490 E-mail : Info@millenniumsolar. com Abstract

A new innovation technology includes construction of a Multi Solar Power Station using the Multi Solar (PV/T) Collectors System and a thermal (steam turbine) generator, using the excessive solar thermal energy produced by the Multi Solar System (MSS) which doubles the amount of electricity produced by the PVT Power Station while reducing the costs of the solar electricity produced to as low as under $3 USD per watt in certain countries.

The scientific basic principal of the MSS Co-Generation System is A built-in MSS that has the highest efficiency existing today — 85% (15% electricity, 35% hot water, 35% hot air or total 70% thermal energy). Each square meter of the MSS produces 150W DC electricity from PV panels (with 30% higher efficiency than the usual PV due to the cooling system of the PV) and a total of 700W thermal energy. This mass of thermal energy could be transferred into electrical energy with 25% efficiency by using a thermal turbine based on a low pressure steam generator.

1. Introduction

The MSS PV/T/A technology is the basic element of the Solar PV/T Power Station. The MSS is an innovative, patented (NO 5522944) Solar PV/Thermal/Air System that makes it possible to convert solar energy into thermal energy and electric energy at the same time using a single integrated collector. The Thermal Steam Generator (Turbine) is the complementary unit to the MSS collector. it makes use of the thermal energy produced by the MSS collector in order to provide an additional and equal amount of energy as is produced by the photovoltaic system.

2. Concept

Millennium proposes to establish a solar power station in an alternative structure, operated by 150°C steam generation and thermal turbine. The existing commercial steam turbines can reach 25% optimal efficiency by using solar thermal energy made by the MSS collectors. This decrease of the feeding temperature for the steam turbine leads to dramatic improvement of the economic feasibility, as a result of the smaller solar array required to provide the same output. This innovative technology should improve the ability of countries to increase solar energy production.

The progress of solar technologies, the comeback of renewable energies and the development of the MSS collector which produces electricity from PV cells with 30% higher efficiency (by cooling of the PV cells using internal water pipes on the back side of the MSS collector and preventing the efficiency degradation of regular PV caused by excessive heat). The MSS is the appropriate technology for this innovative idea since it’s the only mature Solar PV/T technology which has been in operation for many years. The MSS PV/T/A technology which has been developed in Israel has been integrated in a variety of projects for over 16 years. The MSS has proven technology for commercial applications.

Since the proposed solar thermal technology is limited to an operation heat of 150°C, we are limiting the solar steam temperature to a maximum of 135°C, which is the feeding temperature of the thermal turbine. Our innovative idea is to increase the heat of the steam produced by the solar station, while reaching the optimal temperature for the thermal turbine. The system consumes the solar thermal energy produced by the MSS collectors at 55°C at first level. This temperature is being increased by the special solar thermal collectors, connected in 2 rows and transferred to the thermal turbine in temperatures of up to 150°C (steam). The thermal turbine produces electricity based on the thermal energy of 20-25% efficiency. In order to increase efficiency percents, the option to use tracking devices for the MSS collectors may be considered.