电工技师论文（Electrician technician thesis）.doc

电工技师论文（Electrician technician thesis） Technicians thesis Type of work: maintenance electrician Title: an improvement of temperature control in cooling tower fan of central air conditioning system Name: leafy Village ID number： Class: technician Ticket number: Training unit: Identification unit: Date, An improvement of temperature control for cooling tower fan of central air conditioning Abstract: in May 2008 the company bought a Hitachi 560 ton steam type lithium bromide absorption chiller (principle of lithium bromide chiller and the advantages and disadvantages of the annex), a cooling tower with four Typhoon aircraft to sink. The cooling tower fan start, stop and open the number of manual control is adopted, so that it can not achieve automatic control, at the same time, to some extent, increased the workload of the operator. It is convenient to use electronic temperature controller to improve the control mode of cooling tower fan. The temperature of cooling water will determine whether the fan is open or opened. In order to achieve automatic control, reduce unit failure rate, but also reduce the workload of the operator, but also can play a certain energy-saving effect. Key words: cooling tower fan; temperature controller; control mode Text: 1. manually control the cooling tower fan start, stop and open the number of shortcomings When the cooling tower fan starts, stops and opens, manual control is adopted. It is necessary for the operator to determine whether to turn on the fan and to turn on the fan according to the temperature of the inlet of the cooling water. In summer, when the day is full, the inlet temperature of the cooling water changes very little in front and back, so it is OK to turn on the four typhoon directly. But in the case of low load at night or in the morning, it is necessary to increase or decrease the input of cooling tower fan according to the temperature. After nearly a year of operation, the disadvantages of manual control are highlight