【Daily Question】Question from Issue 20151204
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This post was last edited by hjztbwg on 2015-12-11 10:30. Reward for participation: 2 wealth points. Reward for the correct answer: 9 Wealth. A nine-story residential building is designed with a system of individual heat metering and central hot water heating; what is the incorrect approach in this design? The answers are AD. (A) A self-acting differential pressure control valve is installed at the hot water inlet to ensure the flow rate in the indoor dual-pipe system. (B) The domestic heat meter is installed on the return pipe to extend its service life. (C) A filter is placed before the domestic heat meter to prevent it from getting clogged. (D) To ensure the heating capacity of the heating system, the calculations for the supply and return pipes of this system must take into account the energy loss due to heat transfer to adjacent units
A, D. --------------------------------------
In the design of a nine-story residential building with a centralized hot water heating system that includes individual heat metering, which approach would be incorrect? D
I believe the answers to this question should be A and D.
Answer: BC. Analysis: According to 5.2.2–3 of the Standards for Measurement, in central heating systems, static hydraulic balance valves should be installed at the thermal inlet of buildings, and the hydraulic balance of the system should be adjusted accordingly. Whether to install a self-acting differential pressure control valve should be determined based on the range of changes in the pressure difference at the thermal inlet – in order to ensure proper operation of the constant temperature control valve and to prevent noise generation due to the pressure difference during shutdown. Therefore, A is incorrect ； According to Article 5.10.3 of the Civil Code, it is advisable to install the flow sensor of the heat meter on the return pipe, as this helps to extend the battery life and improve the performance of the instrument. Therefore, B is correct ； The Code for Warmth specifies that the flow sensor of the heat meter for mutual use should be installed on the water supply pipeline, but this view is rejected by the Code for Civil Buildings. The document \"Installation of Individual Heat Metering Systems for Central Heating with Hot Water\" 04K502-27 indicates that a filter is installed in front of the household meter.
In the design of a 9-story residential building by B, a centralized hot water heating system with individual heat metering is employed; which approach is incorrect? (A) To ensure the flow rate in the indoor dual-pipe system, a self-acting differential pressure control valve is installed at the heat inlet. (B) To extend the service life of the heat meter, the residential heat meter is installed on the return pipe. (C) To prevent the heat meter from getting clogged, a filter is placed before the residential heat meter. (D) To maintain the heating capacity of the heating system, the calculations for the supply and return pipes of the heating system must take into account the energy loss due to heat transfer to adjacent units
(C) To prevent the heat meter from getting clogged, a filter is installed in front of the residential heat meter. (D) To ensure the heating capacity of the heating system, the calculations for the supply and return water pipes of the heating system must take into account the energy loss due to heat transfer to adjacent units
In the design of a nine-story residential building with a centralized hot water heating system that includes individual heat metering, which approach would be incorrect? (B) To extend the service life of the heat meter, the residential heat meter is installed on the return pipe. (C) To prevent the heat meter from getting clogged, a filter is placed before the residential heat meter
In the design of a nine-story residential building with a centralized hot water heating system that includes individual heat metering, which approach would be incorrect? B(A) is a self-acting differential pressure control valve installed at the heat inlet to ensure the flow rate in the indoor dual-pipe system. B is used to extend the service life of the heat meter; therefore, the residential heat meter is installed on the return pipe. C involves installing a filter before the residential heat meter to prevent it from getting clogged. D ensures the heating capacity of the heating system, and the calculations for the supply and return pipes of this system take into account the energy loss due to heat transfer to adjacent units
In the design of a nine-story residential building with a centralized hot water heating system that includes individual heat metering, which approach would be incorrect? AB