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Standard and calculation of water capacity of central air-conditioning system
Speaking of the central air-conditioning system okmarts.com editor believes that everyone is familiar with it, because the central air-conditioning system can be seen everywhere in our lives. In the central air-conditioning system, the water capacity of the central air-conditioning system is directly related to the central air-conditioning system. The production and use functions and effects of the system play a very important role in the central air conditioning system. So, how is the water capacity of the central air conditioning system calculated? What is the calculation of the water capacity of the central air conditioning system? Below okmarts. The editor of com will introduce the standard and calculation of the water capacity of the central air-conditioning system.
Central air conditioning system water capacity effect
Central air-conditioning system water capacity control, room temperature stability, several suggestions, consider factors such as the comfort of the indoor environment, the service life of the host, the cost of the air-conditioning system and the possibility of project implementation.
Central air conditioning system water capacity standard
During summer operation, when the main engine shuts down for 10 minutes, the temperature of the water supply should not be less than 5℃. During winter operation, when the defrosting time of the main engine is 3 minutes, the temperature of the system's water supply is required to decrease by not less than 3℃. According to the heat balance equation and thermal stability requirements, the minimum water capacity requirements of the winter and summer air conditioning systems can be calculated as follows: G=Qt/(cp△t) where: G- is the minimum water capacity of the system, kg; Q- cooling or heat supply of terminal equipment; kW; t- thermal stability time requirement, 10×60s in summer and 3×60s in winter; cp- constant pressure specific heat of water, 4.187kj/(kg.℃ )△t-the required value of water temperature fluctuation, t=5℃ in summer and t=3℃ in winter. In the calculation results of the water capacity of the system in winter and summer, the value z* is the minimum requirement for the water capacity of the air conditioning system. The actual water capacity of the system is the sum of the pipe water capacity and the equipment water capacity, that is, M=Mg+Ms where M-actual water capacity, kgMg- is the pipe water capacity, kgMs- is the equipment water capacity, kg. The pipeline water capacity is according to The following formula is calculated: where qi- the water capacity per meter of a certain pipe diameter, kg/m, can be selected from the following table; Li- the length of a certain pipe diameter, m. The water capacity per unit length of a common water pipe.
Central air conditioning system water capacity calculation
The determination of the minimum water capacity For residential central air-conditioning systems, to solve the problem of system temperature fluctuations and obtain good thermal stability, first of all, the air-conditioning load should be determined as accurately as possible, and the host with the installed capacity should be selected; secondly, the system The greater the water capacity and the greater the system's cold storage capacity, the better the thermal stability of the system. On the contrary, the worse the thermal stability of the system. Therefore, when designing the water system, check and calculate whether the water capacity of the system meets the requirements of system thermal stability. When the actual water capacity of the system cannot meet the requirements, the main pipe diameter of the system should be increased or a water storage tank should be added. Of course, the system water capacity is not as big as possible. If the water capacity is too large, its thermal stability is undoubtedly good. However, after a long period of shutdown, it will prolong the pre-cooling or pre-heating time of the air conditioner when it is turned on again. During cooling operation, the whole air system is 0.4~0.55, and the air-water system is 0.7~1.3; when the hot water boiler is heating, the whole air system is 1.25~2, and the air-water system is 1.2~1.9; when the heat exchanger is heating, the whole air system is 0.4~0.55, if the circulating water volume of the air-water system is 0.7~1.3, it is: load (kw)*0.86/5, the flow unit is m3/h, and the temperature difference is 5 degrees.
The above is some knowledge about the water capacity of the central air conditioning system introduced by the editor of okmarts.com. After reading the introduction of the editor, everyone should have a simple understanding of the standard and calculation of the water capacity of the central air conditioning system.
