Active Solar Systems is volume 6 in a series that surveys advances in solar energy research since the oil shock of the early 1970s. Books in the series document in particular the period 1973 to 1985, which spawned a rich array of federally financed technological programs and developments facilitating the practical use of solar energy. The twenty-two contributions in Active Solar Systems introduce design, analysis, and control methods for active systems and cover advances in the interconnected technologies for water heating, space heating, and space cooling. They show that, with effective marketing and with environmental costs factored into individual consumer decisions, there is strong potential for solar water heating and space heating, and that solar cooling has potential but needs further development to become commercially viable. The details of the materials involved in these technologies are covered in volume 5, Solar Collectors, Energy Storage, and Materials.

This book is the product of the good will and hardwork of many people. The contributors, all recognized experts in their fields, are thanked for providing thoughtful, informative chapters and for accommodating editorial suggestions and revisions. Westview Press is thanked for providing the opportunity to address a serious omission in the energy literature. The Geography Department at the University of Maryland made a similarly generous commitment of secretarial staff and faciltiies. Allen Eney aided in the construction of computerized maps. Many skilled, conscientious individuals at state energy offices, public utility commissions, the U.S. Department of Energy, and other organizations supplied essential data and produced many of the analytic studies that underlie the contents of the book. Patti Leedham provided patient and expert typing through numerous revisions of the chapters and many tables. Patricia Sawyer provided essential guidance, support, and proofreading throughout the entire effort.