问题 单项选择题

对某新建居住小区设街区水—水换热站,小区内建筑均为低温热水地板辐射供暖系统,下列补水量估算和补水泵台数的确定,正确的是何项

A.每台按供暖系统水容量的1%~2%,3台(两用一备)
B.每台按供暖系统循环水容量的1%~2%,2台
C.每台按供暖系统水容量的2%~3%,2台
D.每台按供暖系统循环水容量的2%~3%,3台(两用一备)

答案

参考答案:B

解析: (1)《城镇供热管网设计规范》CJJ 34—2010第10.3.8条。注意条文解释很重要:正常补水量按系统水容量计算较合理,但热力站设计时系统水容量统计有时有一定难度。本次修订给出按循环水量和水温估算的参考值。
(2)间接连接采暖系统,当设计供水温度等于或低于65℃时,可取循环流量的1%~2%。补水泵的台数不应少于两台,可不设备用泵。
(3)《民规》第8.5.15条、第8.5.16条:空调冷热水的小时泄漏量宜按水容量的1%计算。补水泵总小时流量宜为系统水容量的5%。补水泵总小时流量宜为系统水容量的5%~10%。《民规》第8.5.16条:空调系统补水泵宜设置2台。当设置1台且在严寒和寒冷地区空调冷热水合用补水泵时宜设置备用泵。

单项选择题 共用题干题
填空题

Some consumer researchers distinguish (1) "rational" motives and "emotional" (or "non-rational") motives. They use the term "rationality" (2) the traditional economic sense that assumes (3) consumers behave rationally when they carefully consider all alternatives (4) choose those that give them the greatest utility (i.e., satisfaction). (5) a marketing context, the term "rationality" implies that the consumer selects goods based (6) totally objective criteria, such (7) size, weight, price, and so on. "Emotional" motives imply the selection of goods (8) to personal or subjective criteria—the desire (9) individuality, pride, fear, affection or status.
The assumption underlying this distinction is (10) subjective or emotional criteria do not maximize utility or satisfaction. (11) , it is reasonable to assume that consumers always attempt to select alternatives that, (12) their view, serve to maximize satisfaction. Obviously, the assessment of satisfaction is a very personal process, based (13) the individual’s own needs as (14) as on past behavioral, social, and learning experiences. What may appear (15) irrational to an outside observer may be perfectly rational (16) the context of the consumer’s own psychological field. For example, a product purchased to enhance one’s self-image (such as a fragrance) is a perfectly rational form of consumer behavior. (17) behavior did not appear rational to the person who undertakes it (18) the time that it is undertaken, obviously he or she would not do it. (19) the distinction between rational and emotional motives does not appear to be warranted.
Some researchers go so far (20) to suggest that emphasis (21) "needs" obscures the rational, or conscious, nature of most consumer motivation. They claim that consumers act consciously (22) maximize their gains and minimize their losses; that they act not (23) subconscious drives but from rational preferences, (24) what they perceive to be (25) their own best interests.