What is difference between packaged system and unitary system
Packaged and unitary are both same system but the siting of a packaged unit is more critical than that of separate plant, since all components are together, and a compromise may have to be reached between the convenience of having the unit close to the load and the difficulty of obtaining condenser air or water, transmitting extra noise, or ...
What is the criteria of selection of package air conditioning units?
2016年4月20日 · 13) While connecting the supply air duct to equipment supply air outlet, ensure that a minimum of 1 meter of straight duct piece of the size of the supply air outlet is connected between them. This is a proper air distribution design and installation, the result shall be unnecessary noise shall be avoided, air flow rate and ESP ratings ...
What is the oil trap and why we use it in split air conditioning …
2013年7月24日 · Oil Traps are used as a medium to enhance oil return mechanism.When refrigerant is released from the compressor at high pressure , the compressor oil is also pumped along with the refrigerant.This may cause poor heat tranfer rate as oil foms a coating on evaporater coil.This also reduces the compressor efficiency & life due to improper wear & tear …
What is a working principle of VAV,RAG and SAG in air conditioning?
2015年6月30日 · Air conditioning (often referred to as A/C, AC, or aircon) is the process of altering the properties of air (primarily temperature and humidity) to more comfortable conditions, typically with the aim of distributing the conditioned air to an occupied space to improve thermal comfort and indoor air quality
What is the reason behind installing the DRV and Control Valve on …
2014年8月6日 · 3. With a control valve on the return side, the water is at a higher pressure through the coil, reducing off gas, thereby lowering dissolved oxygen content. Lower dissolved oxygen extends equipment life by minimizing the air entrapment. 4. If it is a hot system, some manufacturers have temperature limitations on the actuators.
What are the differences between CAV (constant air volume …
2016年3月30日 · In a CAV system air delivery is constant or fixed.They have mechanical manual dampers.These systems can only cater to a fixed load which is a disadvantage.Whereas,in a VAV system,air delivery is regulated based on the load by means of an automatic damper(s).This has an electronic sense and act loop.The air conditioned room has a sensor which communicates …
Which is better, AC unit 1 Ton with 400 CFM , or AC unit 1 Ton …
2015年7月15日 · In a general case where a room is to be cooled by a unitary system; thumbrule is1TR shall be capable of cooling300 to400 CFM with minimum fresh air induction. If the space is big enough where the air-side system is central equipment,1 TR shall be capable of cooling500 CFM or in certain cases550 CFM where the fabric heat gain is minimized by ...
What are the differences between FCU, AHU & FAHU? - Bayt.com …
2014年3月8日 · 1. AHU is generally a bigger system than FCU.2. AHU is more complex than the FCU and that AHU are often used in bigger establishments or spaces.3. The AHU system usually channels air through ducts whereas the FCU may have or don't have any ductworks.4. AHU system treats outside air while FCUs basically recycle or re-circulates the air.5.
What is the difference between VAV and FCU? - Bayt.com Specialties
2016年1月14日 · VAV stands for Variable Air Volume. The VAV regulates the quantity of already cold or hot air that is entering a room with the use of a damper.This damper is set in a constantly changing position and it controls the amount of air that passes through the VAV unit. FCU stands for Fan Coil Unit.
What is the meaning of DPS /DPT - Bayt.com Specialties
2013年9月15日 · DPS ( differential pressure switch ) : when the pressure difference between2 points exceeds its set point As before and after HEPA filtethese switch sends a signal to the variable speed drive in order to increase the motor rotational speed which increase the air flow rate to compensate the pressure drop.