Document 8RyyzXGxkQ1NLQarZ3vqj4jKo

n CODE of ETHICS for ENGINEERS NGINEERING work has become an increasingly important factor E in the progress of civilization and in the welfare of the community. The engineering profession is held responsible for the planning, construc tion and operation of such work and is entitled to the position and authority which will enable it to discharge this responsibility and to render effective service to humanity. ;, That the dignity of their chosen profession may be maintained, it is the duty of all engineers to conduct themselves according to the principles----of the following Code of Ethics: 1--The engineer will carry on his professional work in a spirit of fairness to employees and contractors, fidelity to clients and employers, loyalty to his country and devotion to high ideals of courtesy and personal honor. 2-- He will refrain from associating himself with or allowing the use of his name by an enterprise of questionable character. 3-- He will advertise only in a dignified manner, being careful to avoid misleading statements. 4-- He will regard as confidential any information obtained by him as to the business affairs and technical methods or processes of a client or employer. 5-- He will inform a client or employerofany business connections, interests or affiliations which might influence his judgment or impair the disinterested quality of his services. ' - .. 6-- He will refrain from using any improper or questionable methods of soliciting professional work and will decline to pay or to accept com- ; missions for securing such work. 7-- He will accept compensation, financial or otherwise, for a particular service, from one source only, except with the full knowledge and consent of all interested parties. 8-- He will not use unfair means to win professional advancement or to injure the chances of another engineer to secure and hold employment. 9-- He will cooperate in upbuilding the engineering profession by exchang ing general information and experience with his fellow engineers and students of engineering and also by contributing to work of engineering societies, schools of applied science and the technical press. 10--He will interest himself in the public welfare in behalf of which he will be ready to apply his special knowledge, skill and training for the use and benefit of mankind. vi j FUNDAMENTALS OF HEATING AND AIR CONDITIONING Dalton's Law, Dry- and Wet-Bulb Temperatures, Properties of Air, Humidity, Relative Humidity, Specific Humidity, Relation of Dew Point to Relative Humidity, Adiabatic Saturation of Air, Total Heat and Heat Content, Enthalpy, Psychrometric Chart, Properties of Steam, Properties of Water, Rate of Evaporation AIR conditioning has for.its objective the supplying and maintaining, in a room or other enclosure, of an atmosphere having a composition, temperature, humidity, and motion which will produce desired effects upon the occupants of the room or upon materials stored or handled in it. Dry. air is a mechanical mixture of gases composed, in percentage of volume, as follows1: nitrogen 78.03, oxygen 20.99, argon 0.94, carbon dioxide 0.03, and small amounts of hydrogen and other gases. Atmospheric air at sea level is given in percentage by volume as: Ns 77.08, Os 20.75, water vapor 1.2, A 0.93, COs 0.03 and Hs 0.01. The amount of water vapor varies greatly under different conditions arid is frequently one of the most, important constituents since it affects bodily comfort and greatly affects all kinds of hygroscopic materials. LAW OF PARTIAL PRESSURES A mixture of dry gases and water vapor, such as atmospheric air, obeys Dalton's Law of Partial Pressures: each gas or vapor in a mixture, at a given temperature, contributes to the observed pressure the same amount that it would have exerted by itself at the same temperature had no other gas or vapor been present. If p = the observed pressure of the mixture and pi, pi, pi, etc. = the pressure of the gases or vapors corresponding to the observed temperature, then P -- Pi + Pi + Pi, etc. (l) DRY- AND WET-BULB TEMPERATURES Air is said to be saturated at a given temperature when the water vapor mixed with the air is in the dry saturated condition or, what is the equiv alent, when the space occupied by the mixture holds the maximum pos sible weight of water vapor at that temperature. If the water vapor mixed with the dry air is superheated, i.e., if its temperature is above the temperature of saturation for the actual water vapor partial pressure, the air is not saturated. 1International Critical. Tables. 1