abercrombie uk VRF air conditioning (heat pump ) s

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VRF air conditioning (heat pump) system in the scope

Opening to adjust the condenser in the refrigerant flow and export of undercooling,[link widoczny dla zalogowanych], EEV smaller pressure drop. To ensure that each condenser has a certain amount of refrigerant flow,[link widoczny dla zalogowanych], and can be adjusted in each branch can allow the condenser pressure (including the EEV and the condenser pressure drop within the drop) varied little ,[link widoczny dla zalogowanych], generally not more than 0.3MPa (condenser outlet when the undercooling is large,[link widoczny dla zalogowanych], increase this value may be appropriate.) Calculations show that the farthest away from the distance between two parallel condenser and the height difference Si ≤ 80m, a 20rn ≤ ~ <20m. More than 3.4 above the scope of the online analysis showed that only three types of scope while meeting the requirements to ensure system security, stability and efficient operation. Therefore, the scope of multi-line scope is the intersection of three, summarizes the results shown in Table 5. As can be seen from Table 5, in the multi-line scope, the decision indoor and outdoor unit and indoor unit of the question, the height difference is the scope and regulation of the security scope. Multi-line due to thermal recovery is likely to be indoor and outdoor unit or condenser, evaporator, it is indoor and outdoor unit height difference between the restrictions are more stringent. By the refrigerant pipe quality and limited features, it is difficult by technical means to further expand its height limit. Multi-line scope of the connecting pipe-line length L depends on many conditions of the energy efficiency rating and reference products (air-cooled cold (hot) water unit) of the energy efficiency rating. When the light level to improve the energy efficiency of products, the more long-line of the connecting pipe will be further reduced; but with the multi-line continuous improvement of energy efficiency, the (pipe length) scope will subsequently be expanded. Table 5HCFC22 scope of multi-line multi-line type of system scope, m length of the room Achillea condensate is worth noting that the scope of multi-line system and the kinds of refrigerants, is given in Table 5 HCFC22 as a refrigerant 11 - 28 No. 2, 20O7 on April Refrigeration JournalofRffrigelVo1.28, No. 2 is. 20O7 multi-line description of the scope of example, the scope of this type of product is not the absolute value, for the use of other refrigerants such as R410a multi-line system, its scope must be based on the physical properties of refrigerants, using tubes [1] material quality analysis identified other factors. 4 Conclusion scope of the problem is the core issue of multi-line system. Multi-line multi-line scope is to ensure security, stability, an important condition for efficient operation, it is with many on-line type, refrigerant type, the design of products and the connecting pipe pressure, expansion valve adjustment features and describe the scope economy reference system of performance indicators and other factors. Multi-line scope presented here is the scope of the security, economic and regulatory scope of the scope of the intersection, the use of gas-liquid two-phase physical network can carry out quantitative analysis of these three scopes. Scope for quantitative analysis of multi-line, multi-line system for in-depth understanding, and further optimize the system, improve performance, standardize their behavior has a direct installation guide, current research work has only just started, with the continuous theoretical and experimental research complete, multi-line scope will be described more accurately. 12-A [2] [3] [4] [5] [6] [7] [8] References Shaoshuang Quan. Complex pipe network simulation of refrigeration systems [D]. Beijing: Tsinghua University, 2005. Kai Yan Sen. VRF air conditioning units of [J]. HVAC, 2OO2, 32 (5) :2-4. GB/T18837-2OO2, VRF air conditioning (heat pump) unit [s]. HiraoT, OhzekiS, KobayashiS. Predictionofperformanceandstabilityofheatpumpsystemswithlongpipesandhighhead [C]. ASHRAETransactions, 1992,98 (1) :411-419. Shiwen stars. Variable refrigerant volume air conditioning system characteristics and control strategy [D]. Beijing: Tsinghua University, 2OOO. GB19577-2OO4, limit the value of the chiller energy efficiency and energy efficiency rating [s]. Shao Shuangquan, Shiwen star, Xianting. General modeling complex cooling systems and simulation of [c]. In HVAC & R 2OO4 National Academic Papers, 2OO4 ,10,209-218. Shao Shuangquan, Shiwen stars, Xianting, Kai Yan Sen. Multi-line scope of [c]. Chinese Institute of Refrigeration Code, the Chinese Association of Refrigeration Refrigeration and Air Conditioning 2005 Annual Conference Proceedings, Kunming, Yunnan, November 2005 ,353-357.

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