英语翻译4.2 Retrofitting:4.2.1 Conversion of constant volume air

英语翻译
4.2 Retrofitting:
4.2.1 Conversion of constant volume air distribution systems to variable air volume (V.A V) can represent energy savings.It often requires that some action be taken to prevent the control fans from operating at critical area and producing excessive negative statics in the budding.A VAV system delivers air in quantities based on the actual instantaneous load requirements.The more variable the building load,the greater the savings.In a typical general office building,the difference in fan cfm between a constant volume system and the average flow in a VAV system is typically 30% - 40%.Similar way converting single duct constant volume reheat and also dual duct constant volume to VAV system will totally eliminate the reheat action in most interior zones and significantly reduce it in the exterior zones.
4.2.2 Introduction of automatic scheduling and duty cycling of HVAC equipments saves energy in many areas.Optimum cycling and scheduling produce additional savings by varying equipment's start and stop times so that morning cool down or warm up times are no longer than necessary as measured by space and outdoor temperatures.
4.2.3 Introducing controls in room thermostats energy can be saved in four basic ways:By setting thermostat up to 25 deg.C in cooling mode and down to 23 deg.C in heating mode.By preventing simultaneous heating and cooling and also by setting the temperature lower at heating season and shutting off at cooling season during night or unoccupied period.
In each case,the savings result from maintaining space temperature at level which is compatible with new standards and which cannot be easily defected by occupants.
4.3 Chiller Controls :
Energy used for air conditioning accounts for a significant portion of kilowatt hours consumed during the year.Introducing controls in the operation of each component of the chiller along with related equipments might be the answer of energy conservation in air conditioning.There are several basic ways to conserve chiller plant energy.

4.2改造：
4.2.1转换恒定体积空气分配系统,变风量（五影音）可以代表节约能源.它往往需要一些采取行动,以防止球迷从作业控制在关键领域和生产过度消极静在萌芽.阿变风量空调系统提供空气中的数量根据实际瞬时负载要求.更变负荷的建设,更多地储蓄.在一个典型的普通办公楼,差额采用CFM风扇之间的恒容体系和平均流量的变风量空调系统通常是30 ％ - 40 ％ .类似的方式转换单管恒容热,还双管定容,以变风量系统将完全消除再热行动在大多数室内区,并大大降低了它的外部区.
4.2.2介绍自动调度和义务骑自行车的HVAC设备节约能源的许多领域.骑自行车和优化调度产生更多的储蓄,不同设备的启动和停止时间,以便上午降温或加热时间没有超过所需的时间来衡量的空间和室外的温度.
4.2.3引入室内恒温控制能源可以保存在四个基本途径：通过设置恒温高达25 deg.C的冷却方式和下降到23 deg.C在供暖模式.防止同时加热和冷却,并通过设置在温度较低的取暖季节和关闭冷却赛季在夜间或空置期.
在每一种情况下,储蓄因空间温度保持在一级这是符合新的标准,并不能轻易叛逃的占用.
4.3机组控制：
实现空调耗能占了很大一部分千瓦时消耗在这一年里.介绍了控制运行中的每个组成部分的冷却与相关设备的答案可能是节能空调.有几个基本的方法,以节约能源的制冷机厂