【 Weak current College 】 floor heating design construction issues analysis summary

Floor heating as a heating methods, has gradually matured. Some up-front engineering provides us with valuable experience, but also reflected in the design and construction. The design and construction of totals are as follows

1. coil spacing of design problems with warm <BR> market expansion, installed units are counterfeited. Minor installation unit blind meet user comments, some projects, such as encryption, spacing both cause the waste of energy, but also seriously affect the heating effects. Under normal circumstances, coil spacing is determined by the room heat load, backwater temperature and temperature, insulation layer and fill the layer thickness, and decorative surfacings and thickness, thickness, and a series of factors in the decision, must be considered at design time. Coil arrangement should be room to adapt to the heat load distribution, i.e. the exterior wall, heat load large parts of the coil should be encrypted, but for the room of the Centre, the load is very small, some large coil spacing. So, to make the indoor temperature, reducing air convection, improve air quality, heating effects.

Second, the loop coil length problem <BR> the floor radiant heating jgj142-20043.5.2 on coil length for: connect in the same water separator, set on the water of the same diameter of the loops, the length of the heating pipe should be close, and should not be more than 120m. ≪BR> This should be the correct understanding of the loop: coil length of automation system with floor heating. For installation the pressure balance device system, coil gap between various loop lengths can, as long as the resistance loss not exceeding water pump provides pressure head, you can totally do lab control. For no pressure balance device installed in the system, you must close the loop lengths. In fact, here is a closer level of problem, i.e. the same diversity of water with two loops up to the difference between the m? on this, refer to the heating, ventilation and air conditioning design standard stipulates: the same system for parallel loops of unbalance rate should be controlled at 15%. For example: suppose the longest = 90m L, L minimum = 90-90 * 15% = 76.5m through extensive engineering practice, "push the unbalance rate should be controlled at 15%," in design can achieve relative resistance balance, and individual room control.

3. warm the main line design problems to warm the competent road design has two methods: a heating load, temperature difference for backwater; another should meet the floor heating coil most small flow rate requirements. Should the lesser value. With a construction area of 100 square meters of housing, for example:

Heating heat index for 60W/m2, heating load: 100 * 60 = 6000W = 6kW flow rate: (6 * 0.86)/10 = 0.516m3/h

Single heating coil requires minimum water flow: pipe PERTDe20 * 2.0 water velocity: 0.26m/s (the floor radiant heating technical specification of requirements not less than 0.25m/s. ) G min = 3.14 * [(0.02-0.004)/2] 2 * 0.26 * 3600 = 0.19m3/h i.e. single heating coil requires minimum water flow to 0.19m3/h. If the residential design for 4 branch, the minimum total households 0.19 * 4 = 0.76m3/h. The above calculations, we design the end to which prevail? if the heating load and temperature-based backwater approved water flow, engineering systems often have not hot air, to investigate its causes, because of insufficient gas slug flow system cycle. Thus the design flow must meet the floor heating coil most small flow rate requirements to avoid system product gas impact heating effect. When the design flow restrictions, should be adjusted in indoor branch number.

4. toilet installation problems bathroom radiator consider waterproof problems, do not generally warm. General practice is to use the bathroom type radiator heating since into a loop. Since the bathroom type radiator water resistance is small, the bathroom water flow on the high side, or even affect the heating effects. This shows that the toilet installation heating, you should be aware of the loop resistance balance between. The authors make several points:

1. bathroom heating and other room series, sharing a loop. So the loop resistance can be balanced, but would create this bathroom loops back the temperature is lower than other loop. Because the radiator installation location, easy to set.

2. bathroom heating since into a loop, heating water supply pipe another installation of stop valves, regulating the flow. Globe valves belong to high resistance valve, with good conditioning characteristics.

3. bathroom heating for return pipe by the home competent leader, also need heating water supply pipe another installation of stop valves.

The above method, the advantages and disadvantages that should be considered at design time.

The above question is in the summary of the deficiencies also hope colleagues humour. Found the problem, fix the problem, our technical standards can be improved. Solutions in the design and construction of these issues, as reflected in the HVAC engineer responsibilities, but also warm and healthy development. Floor heating is a heating technology, and not simply the floor heating pipe buried beneath the floor, but a system engineering. How to keep warm do scientific and reasonable, the warm comfort and energy saving, this be worth thinking about every warm people.