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00 O? In N c xu CONTENTS CHAPTER VI-ARTIFICIAL COOLING BY WATER FLOWING IN EMBEDDED PIPES-Continued COOLING BY LONG EMBEDDED PIPES Section Page 64. General discussion_________nnnn____________________________ 120 65. Development of Y curves_ __ _ __ __ _ ~ _ _ __ n __ __ __ _ _ _ __ __ __ __ _ _ __ __ 1-21 h't 1. Solution of Yfor D2=O---------------------------------- 123 h't 2, Solution of Yfor D'>O------------------ ,_______________ 125 66. Development of Z curves__ _ __ _ __ _ __ __ __ _ _ _ _ _ _ _ __ __ __ __ __ __ _ _ __ _ 128 67. Development of X curves_______________________________________ 129 68. X, Y, and Z curves for bja not equal to 100_______________________ 130 69. Example on use of X, Y, and Z curves____________________________ 134 70. X, Y, and Z curves for a given installatioll_____________________ ___ 136 CHAPTER ViI-EARLY STUDiES OF METHODS OF COOLING HOOVER DAM 71. Preliminary investigations_________ ___n. _________ ________________ 141 METHODS STUDIED 72. EIPbedded-pipe method__ _ u__________ _________ __ __ __ _ _ __ __ __ __ _ 142 73. Air-cooled slot method_____uh ________________________________ 143 1. Air cooling with individual refrigeration units in the slots_____ 143 2. Cooling with a central refrigeration plant___________________ 144 3. Feasibility of using air corr.pressors previously used for tunnel excavation to furnish air for cooling dam___________________ 145 74. Use of precooled aggregates__________________uu__ ____________ 145 75. Use of precast concrete blocks_______.u_____u__________uu__u_ 147 SUMMARY 76. Comparison of methods__ ____ ___ ____~_u__ u__ __ u __ __ u _ _ _ __ __ _ 147 CHAPTER VIII-STUDIES OF EMBEDDED PIPE SYSTEMS FOR HOOVER DAM 77. Value of a detailed cooling study_____-.:.___'___________________ 149 BASIC DATA FOR A TYPICAL COOLING STUDY 78. Initial temperatures________________._.~-_______u_________u_____ _ 149 79. Allowance for time lost between time of pJa.cing and tirre of cooling_ _ _ 151 80. River water for cooling____________-____________u_______________ 151 81. Refrigerated water for caoling_________~_________________________ 152 82. Header system____ __ ______ ______ _____ ____ __ _ ____ _ _ uu ____ ____ _ 152 83. Dimensions of cooling coils_________________________uu_________ 152 DESCRIPTION OF A TYPICAL COOUNG STUDY 84. Layout of study ____' _ _____ _ _ ___ __ __u__ __ __ ____ _______________ 152 85. Refrigeration capacity________________________________u_______. 155 86, Cooling chart___ __ _________ ______ __ __ __ __ __ _______ __ __ __ __ __ __ _ 159