As far as thermal effects on the concrete, other than the thermal = coefficient movement, you are not going to damage the concrete at = temperature to somewhere above boiling water. Simone Fabris wrote: > Hi, > = > I'm using a floor heating, working with low temperature water (I've never > seen more than 25 =B0C in the water pipes) in my house. > Before the concrete was poured I was thinking on a temperature control for > the water based on sensors in the floor. > Before the sensor were ready, concrete was already pured... Wat was in my > mind at the time was a maxim/dallas 1wire redundant net of sensor (like > DS18B20), but this were never realized. > = > My experience with floor heating, is that you don't need lot of control > system. Heat masses are so big, that what you need is just: > - one time adjust of the system (more water on the cooler are, less on the > hotter are of the building); > - regulate the heat transfer with a linear function of the outside the > outside temperature (all modern heat generator do this). > = > I think the you can make the 1st with a thermal camera, the second is > straight forward.. > If you need heat losses etc. of the building, you don't actually need more > than in & out temperature of the fluid and an estimation of the flow. > = > Ciao, > = > Simone > = > On Thu, Jan 29, 2009 at 5:42 PM, Volker Soffel = wrote: > = >> At 06:20 AM 1/29/2009, you wrote: >>> From: "Andre Abelian" >>> >>> Why do you need to put temperature sensor in concrete ? >>> I am just cereus? Suppose you know the temperature ? then >>> What are going to do with it? >>> >>> Thanks >>> >>> Andre >> The purpose is to measure different heating zones of a solar powered >> radiant floor heating system >> for a single family home. Area of concrete approx 4200sqft. The >> temperature readings are used >> to adjust the hot water flow through the different zones and to monitor = the >> performance of the overall system in general (there will also be >> temperature sensors >> to monitor ground temperature (below concrete - to verify >> effectiveness of insulation >> of concrete floor to underlying ground essentially), water >> temperature in the entry and return loops >> and outside air temperature, as water temperature also needs to be a >> function of the >> temperature delta between outside and inside temperatures. >> >> So for the concrete based sensors you are looking probably at >> something like 20 sensors >> with cable runs of up to 200 ft to get to the central collecting point. >> >> >> best regards >> Volker >> MicroController Pros Corporation >> microcontrollershop.com >> The World's Largest Embedded Tool Selection >> +1-408-776-7992 Phone >> +1-215-243-6071 Fax >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist