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The appearance of the present chapter six years after the publication of Marx's Capital and more than a year after its translation into Russian might seem somewhat untimely, if not entirely superfluous. Who in our country has not read Marx's works, or at least heard of him; who does not know that besides interesting and instructive facts, his work contains new and important socio-political truths? No doubt many have read it and heard of it, but I permit myself to doubt, and not only in an a priori fashion, but on the basis of extensive observation, whether many have gained from a reading of the book a clear and precise understanding of the topics which are treated therein. Are there many who have managed to distinguish in it what is significant from what is of small importance, who have noticed what constituted the core elements or the framework of the whole theoretical edifice as opposed to the detail, which serves only to decorate it, who have been properly aware, what Marx introduced that was new into the consciousness of his contemporaries, and what, on the contrary, did not belong to him, but to his predecessors? We repeat that from frequent observations we have become convinced of the contrary. With some very few exceptions, we have so far not managed to come across people who have understood the significance of Marx's researches in their entirety. Some – and these constitute the majority – are barred on the way to an elucidation of the essence of the matter by Marx's doctrine of the forms of value; others – by the difficult, and, if the truth be told, somewhat scholastic language in which a considerable part of the book is written; and others again are put off by the unaccustomed complexity of the subject and the ponderous argumentation encased in the impenetrable armor of Hegelian contradictions. And not only in Russia, but abroad as well Marx has fared no better. One only has to read reviews by some Baumert, Siebel or the reviewer in Bruno–Hildebrand's Jahrbücher, R. (presumably Rössler) to see at once that all these gentlemen possess one important advantage over the majority of Russian readers in that they not only could not, but also would not understand Marx's investigations. Thus, the above reviewer puts to Marx, among others, the following question: “we would like it if someone were finally to explain to us why the food which finds its way into the stomach of a worker serves as the source of the formation of surplus value, whereas food eaten by a horse or an ox lacks the same significance.” If such a “someone” were really to be found, in which the author of the review expresses serious doubt, then he would probably explain the matter in the following way: that economists and sociologists, to whose number Marx belongs, had to date the weakness to think that the chief object of their investigations was human society, and not the society of domestic animals, horned or otherwise, and therefore they are concerned with that surplus value which is produced by human beings. If, like Darwin, they studied natural science, they would probably have found something like surplus value among various other animals, for example, among different species of ant or bee. Generally speaking, not counting Lange's book on the worker question, and the reviews of some people directly involved with the practical consequences of Marx's ideas, the foreign press presents almost not a single line which would evince in its author the desire and the ability to understand the general significance of Marx's work. These deficiencies, especially the second one, are characteristic of even those writers, like Schäffle, who are quite favorably disposed towards Marx and are aware of his scientific achievements.

In this chapter the potential to use water-based Trombe walls to provide heated water for building applications during the summer months is investigated. Design Builder software is used to model a simple single-story building with a south-facing Trombe wall. The effects of using different thermal storage mediums within the Trombe wall on building heating loads during the winter and building cooling loads during the summer are modeled. The amount of thermal energy stored and temperature of water within the thermal storage medium during hot weather conditions were also simulated. On a sunny day on Toronto, Canada, the average temperature of the water in a Trombe wall integrated into a single-story building can reach ∼57°C, which is high enough to provide for the main hot water usages in buildings. Furthermore, the amount of water heated is three times greater than that required in an average household in Canada. The results from this work suggest that water-based Trombe walls have great potential to enhance the flexibility and utility of Trombe walls by providing heated water for building applications during summer months, without compromising performance during winter months.

The use of fossil fuels in developing countries places increasing economic, health, and environmental costs on the population. In decentralized and rural communities without existing grid systems, direct solar technologies provide the basis for electricity production, for water pumping and hot water, and for heating of houses. Examples and case studies for each of these direct solar technologies are presented which may be directly applicable or potentially modified for rural development in countries such as Uzbekistan and Turkmenistan, which have ample direct solar resources. Related design involving both daylighting and passive cooling are described as part of the incorporation of passive solar heating techniques.

Although fossil fuels have been used to produce energy since approximately 1850, emissions resulting from fossil fuel-based energy production are closely associated with the increase in global mean temperature, which, in turn, has affected the climate. As a result of climate change, ecosystems and humans are already experiencing adverse effects such as prolonged heat waves and extreme droughts. A realistic approach to the mitigation of climate change is the deployment of renewable energy sources; that is, naturally replenishing sources such as wind and sun, which can produce infinite energy with significantly lower emissions, compared to fossil fuels. In order to help students understand the intricate relationship between climate change and energy, this chapter presents significant information and provides exercises which help students practice their knowledge and language skills.

The urban heat island is an unintended consequence of humans building upon rural and native landscapes. We hypothesized that variations in vegetation and land use patterns across an urbanizing regional landscape would produce a temperature distribution that was spatially heterogeneous and correlated with the social characteristics of urban neighborhoods. Using biophysical and social data scaled to conform to US census geography, we found that affluent whites were more likely to live in vegetated and less climatically stressed neighborhoods than low-income Latinos in Phoenix, Arizona. Affluent neighborhoods had cooler summer temperatures that reduced exposure to outdoor heat-related health risks, especially during a heat wave period. In addition to being warmer, poorer neighborhoods lacked critical resources in their physical and social environments to help them cope with extreme heat. Increased average temperatures due to climate change are expected to exacerbate the impacts of urban heat islands.

This study has covered many types of solar-powered air-conditioning systems that may be used as an alternative to traditional electrically powered air-conditioning systems in order to reduce energy usage. Solar adsorption air cooling is a great alternative to traditional vapor compression air-conditioning. Solar adsorption has several advantages over traditional vapor-compression systems, including being a green cooling technology which uses solar energy to drive the cycle, using pure water as an eco-friendly HFC-free refrigerant, and being mechanically simple with only the magnetic valves as moving parts. Several advancements and breakthroughs have been developed in the area of solar adsorption air-conditioners during the previous decade. However, further study is required before this technology can be put into practise. As a result, this book chapter highlights current research that adds to the understanding of solar adsorption air-conditioning technologies, with a focus on practical research. These systems have the potential to become the next iteration of air-conditioning systems, with the benefit of lowering energy usage while using plentiful solar energy supplies to supply the cooling demand.