Weak current College】 【water heat heating system can successfully access existing heating network.

<br> Low-temperature floor heating (hot water floor heating) is more popular in recent years, a heating solution, because of its comfortable, energy efficient, attractive and is deeply welcome the user. But due to the heating system of heat networks .are designed and constructed by the radiator heating, heat network most users use the radiator heating system, heating and water heating to warm the parameters of the parameter does not match the existing heating network in how users need to access radiant floor heating system is a worthy .of discussion and study of the issues that this article combines yantai500 (hereinafter referred to as the "500 heating company") of the actual situation on the above issues analysis and discussion. <br> Radiant floor heating access 500 heating company problems existing in the .heating network <br> I. water heat heating system and hot 500 heating company network for backwater temperature do not match. Water heat heating system water temperature generally 35 degrees Celsius ~ 50 ° c (up to 60 ° c) temperature for backwater between, .generally not more than l0 degrees Celsius, and 500 heating company second network are all designed by radiator heating, backwater design temperature is 80 ° c/55 ° c, the actual operation of the secondary network supply temperature of 55 degrees Celsius in General-65 .° c, the temperature difference between the generally in backwater 15 ℃, 500 heating company hot net use water and heat to warm the fully considered backwater temperature of different particular requirements for pipe and the water temperature is too high for comfort, avoid the surface temperature .is too high; in addition to warm due to heat water for water temperature does not exceed 10 degrees Celsius, we also take full account of the radiant floor heating access 500 heating company hot NET on secondary network flow of special requirements. <br> Second ., water and heat to warm the system cycle pressure differential and 500 heating company heating network of design parameters do not match. Low-temperature radiant floor heating system with the desired cycle pressure usually 3 to 5 m · H2O, radiator heating system with the desired .cycle pressure difference 1 ~ 3 m · H2O, therefore the heat in the 500 heating company is broadly based on the radiator heating network design, network Terminal should avoid using direct-attach mode into hot water heating system. <br> Low-temperature radiant .floor heating in the 500 heating company hot network implementation plan <br> Water heat heating system can directly connected mode can also be used with heat exchanger for indirect joins and human heat network of the company, both the strengths and weaknesses of the programme and its .application to analysis of the range are as follows: <br> 1. indirect connection scenarios. The programme is in the use of water and heat heating system of the building, ground floor located heat exchange station, heat exchanger after the parameters according to water .heat heating system requirements. The programme has the advantage that you can completely solve water and heat to warm the hot 500 heating company access network in all issues that can ensure that the heating effect and comfort. The programme's initial investment is larger, run management inconvenience ., the maintenance cost is high, therefore, only at the end of the fever heat network circulation pressure to meet the water heat heating system of the required pressure of the demand for this programme. <br> 2. direct connection scenarios. The programme is .to water heat to warm the direct access 500 heating company second network, without heat exchanger, and 500 heating company second network quarantine connection, which can be divided into and mixed water pump of direct connection and not mixing pump of direct connection. <br> .1. a mixing pump of direct connection mode is set in the user entry to warm the mixture pumps, pump user heating system, water supply-water and blend will blend of water temperature 60 ° c, this method has the advantage that resolved the 500 .heating water temperature and heating network company heating system does not match, a lower initial investment, the disadvantage is that running management inconvenience to adjust difficulty heating network. <br> 2. no mixing pump of direct-attach mode is floor heating the user entry .without any other additional facilities, a direct connection with heating system, the advantages of this connection is the initial investment is low, it is convenient to run management, operation and maintenance costs are low. The disadvantage is that there is no resolution of 500 heating .water temperature and heating network company cycle pressure do not match, the implementation of technical difficulty is higher. How to solve the 500 heating company hot water temperature, cycle flow network, circular pressure do not match, we have adopted the following measures: <br .> (1) pipes and wall thickness. We use de20PEX tube as 500 heating company heating system heating pipe. The minimum wall thickness of pipes greater than 1.4 mm, consider part of aging allowance and wall thickness tolerance, the company is PEX pipes are selected .or S5 S4. <br> (2) heating pipe layout, because 500 water temperature heating company heating network than normal, hot water heating system water temperature is high, if it is not appropriate to increase the spacing will inevitably cause heating floor surface temperature .is too high, the impact of comfort because the 500 heating company heating network design by heating radiator, the pressure of the users are 1 ~ 3 m · H2O, if not properly controlled single root heating pipe length will inevitably result in loop resistance, cycle .too slow or stagnant, impact heating effect. Therefore, 500 heating warm water heating company in the design process are available to the average temperature of 55 ° c water, indoor air temperature 16 ° c to select heating pipe spacing. Cloth duct as far as .possible "to form" layout, avoid high temperature area, through the above measures to prevent floor surface temperature is too high. In addition the design process is rigorous hydraulic calculation, make sure that the single root heating pipe frictional resistance and local resistance and not .greater than 1.0 m · H2O, once more than 1.0 m · H2O the heating pipe layout repartition, reduce the length of a single root heating pipe, through such measures to prevent the heating system and the radiator system when you access the same heating radiator heating .system was "snatched" the water system. <br> (3) heating pipe fixed and fill layers, because 500 heating water temperature heat network company than ordinary water heat heating system water temperature to high heating tubes produced by thermal stress than ordinary floor heating .system with thermal stress, plus 500 heating company heating system heating pipe wall thickness to select compared with ordinary floor heating system and heating pipe wall thickness to thick, heating for the tube card thrust than ordinary floor heating system, once processing is not good, very .susceptible groundCracking, therefore we appropriate increased heating pipe fixed pipe clamp to decentralized heating pipe, pipe clamp spacing thrust at the lower limit value in the design specification, straight from 0.5 m, bent section of 0.2 m, thus ensuring a reliable fixed heating pipe; .to fully prevent surface cracking, we do a heating pipe fixed at the same time also to fill layer; strengthen the heating of fine stone concrete fill the layer with a layer of diameter 2 mm, with an area of 100 mm · 100 mm wire mesh .to increase tensile strength of the backfill layer to prevent cracking in the ground. <br> Through the above measures, water and heat to warm without mixing pump of direct and one 500 heating company radiator heating heating network, saving investment, simplifying the system, .reducing the running cost of maintenance. People from and heat supply network of water-heat heating system running, reached the floor heating system appearance, comfort, energy-saving requirements, run has been stable and reliable. <br> <br> <br .>.