available adj. 1.有用的,可利用的。 2.可以得到的,可以买到的。 3.有效的。 4.有当选希望的;愿意参加竞选的。 He is not available for the job. 他不适宜做这个工作。 available water 有效水分。 employ all available means 用尽一切方法。 ticket available on day of issue only 限当日通用[有效]的票子。 This book is not available here. 这里没有这本书。 The doctor is available now. 医生现在有空了。 adv. -bly 有效地。 n. -ness 有利,有效,效用,利用。
Based on the comparative analysis of two available heat system plan , the paper selects the water - water heat pump system plan . after a series of character analysis , design calculation ; the style of compressor including media choosing and its circle dynamic calculation for the thermodynamic system is determined . besides this , based on some basic measure of thermodynamic analysis , the heat pump coefficient of performance is discussed ; the exergy analysis for the water - water heat plan is conducted ; the calculation formula of heat pump exergy efficiency is derived ; an optimal model for heat pump together with thermal machine is established and the main exchanger equipment in heat pump system including its resistance calculation is designed in details 本文通过对两种系统方案进行比较分析,确定了水环热泵系统的基本方案,经过定性分析和设计计算,进行了压缩机的选型、工质的选择、热力系统的循环计算等基本设计,同时应用热力学分析的一些基本方法,讨论了如何评价热泵系统的性能系数,并对电厂循环水余热回收热泵系统进行了(火用)分析,得到了热泵过程(火用)效率的计算公式,建立了热泵?热机联合机组优化模型,还对热泵系统的主要换热设备进行了详细的结构设计和阻力计算,最后对热泵系统进行了技术经济分析和评价。