Low-Temperature District Heating Implementation Guidebook. This guidebook was written between 2018 and 2021 by seventeen authors within the IEA DHC/CHP TS2 annex. The input came from 250+ literature references and 165 inspiration initiatives to obtain lower temperatures in buildings and heat distribution networks. The author group wrote 40 internal documents about early implementations of low-temperature district heating. Fifteen of these early implementations are presented in this guidebook. The guidebook contains aggregated information about the main economic drivers for low-temperature district heating, how to obtain lower temperatures in heating systems inside existing and new buildings, and how to obtain lower temperatures in existing and new heat distribution networks. An applied study of a campus system in Darmstadt shows the possibility of reducing temperatures in an existing heat distribution network with rather high temperatures. The competitiveness of low-temperature district heating is explored by analysing business models and heat distribution costs. Early adopters of low-temperature district heating are presented by examples and by identified transition strategies. Five groups of network configurations with fourteen variants are presented to be used for low-temperature district heating. Finally, all 165 identified inspiration initiatives and all 137 locations mentioned are listed.

Volume 11 in the sixteen-volume Dietrich Bonhoeffer Works English Edition, Ecumenical, Academic, and Pastoral Work: 1931-1932, provides a comprehensive translation of Bonhoeffers important writings from 1931 to 1932, with extensive commentary about their historical context and theological significance. This volume covers the significant period of Bonhoeffer's entry into the international ecumenical world and the final months before the beginning of the National Socialist dictatorship. It begins with Bonhoeffer's return to Berlin in June 1931 after his year of study in the United States. In the crucial period that followed, Bonhoeffer continued his preparations for the ministry, began teaching at Berlin University, and became active at international ecumenical meetings. His letters and lectures, however, also document the economic and political turbulence on the European and world stage, and Bonhoeffer directly addresses the growing threat of the Nazi movement and what it portends not only for Germany, but for the world. Several of the documents in this volume, particularly the student notes of his university lecture on "The Nature of the Church" and his lectures on Christian ethics, give important insights into his theology at this point. His ecumenical lectures and reports are significant documents for understanding the ecumenical debates of this period.

Preaching, according to Bonhoeffer, is like offering an apple to a child. The gospel is proclaimed, but for it to be received as gift depends on whether or not the hearer is in a position to do so. Offered here are thirty-one of Pastor Bonhoeffer's sermons, in new English translations, which he preached at various times of the year and in a variety of different settings. Each is introduced by Bonhoeffer translator Isabel Best who also provides a brief biography of Bonhoeffer. The foreword is by Victoria J. Barnett, general editor of the Dietrich Bonhoeffer Works, English edition, published by Fortress Press, from which these sermons are selected. In his preaching, Bonhoeffer's strong, personal faiththe foundation for everything he didshines in the darkness of Hitler's Third Reich and in the church struggle against it. Though not overtly political, Bonhoeffer's deep concern for the developments in his world is revealed in his sermons as he seeks to draw the listener into conversation with the promises and claims of the gospela conversation readers today are invited to join.

Despite Dietrich Bonhoeffer's earlier theological achievements and writings, it was his correspondence and notes from prison that electrified the postwar world six years after his death in 1945. The materials gathered and selected by his friend Eberhard Bethge in Letters and Papers from Prison not only brought Bonhoeffer to a wide and appreciative readership, especially in North America, they also introduced to a broad readership his novel and exciting ideas of religionless Christianity, his open and honest theological appraisal of Christian doctrines, and his sturdy, if sorely tried, faith in face of uncertainty and doubt. This splendid volume, in many ways the capstone of the Dietrich Bonhoeffer Works, is the first unabridged collection of Bonhoeffer's 19431945 prison letters and theological writings. Here are over 200 documents that include extensive correspondence with his family and Eberhard Bethge (much of it in English for the first time), as well as his theological notes, and his prison poems. The volume offers an illuminating introduction by editor John de Gruchy and an historical Afterword by the editors of the original German volume: Christian Gremmels, Eberhard Bethge, and Renate Bethge.

Dietrich Bonhoeffer's pastoral sojourn in England from October 1933 to April of 1935, which he initially viewed as a withdrawal from the church clashes in Germany, marked instead a new phase in his intensive participation in that struggle. This enlightening volume provides an almost daily documentation of his deepening engagement against the placid backdrop of his two London pastorates.Detailing Bonhoeffer's extensive contacts with German expatriates, ecumenical partners and allies, and friends and family, "London: 1933-1935" impressively records both Bonhoeffer's involvement in the rapidly developing clash with the deutsche Christen and the means by which he pursued it. The bulk of the material consists of his wide correspondence but also includes records and minutes of his congregational meetings, excerpts from the diaries of Bonhoeffer's friend and London colleague Julius Rieger, reports from international conferences from 1934, and more than twenty sermons he preached to his London congregations. The wealth of this material, says editor Keith Clements, allows us to experience a dramatic slice of this history and see the many and complex facets of Dietrich Bonhoeffer's personality.

"Then came the crisis of 1933." This is Bonhoeffer's own phrase in a letter that documents a turning point in his own life as well as that of the nation. Of Bonhoeffer's own life at this time, his biographer writes, "The period of learning and roaming" from 1928 until 1931 "had come to an end" as the young lecturer, age 26, began to teach "on a faculty whose theology he did not share" and to preach "in a church whose self-confidence he regarded as unfounded." Bonhoeffer was becoming part of a society "that was moving toward political, social, and economic chaos." Events moved quickly at the onset of 1933 in Berlin. In only one hundred days the path was cleared by the German Parliament and the Nazi Party for the establishment of the fascist dictatorship. These one hundred days, as well as the preceding and succeeding months, are reflected in the materials in this volume: in letters, in sermons, in Bonhoeffer's university teaching, in manifestos and a church confession, and in his proactive engagement in the developing church struggle. The vast majority of these are translated here for the first time.