A positive displacement pump with temp sensing on the inlet and the outlet and a flow meter. The water running in a loop through a large, possibly insulated container... The Portable Spa is a good idea.... the heat calculated from the two different efforts should be within the error bands for the different measurements...
Thus two independent ways to measure heat... On Mon, Aug 12, 2013 at 2:03 PM, DJ Cravens <[email protected]> wrote: > yes, I often use an FMI metering pump. They have good control. > > D2 > > > ------------------------------ > CC: [email protected] > From: [email protected] > To: [email protected] > > Subject: Re: [Vo]:Suggestions for a more effective demonstration > Date: Mon, 12 Aug 2013 14:50:03 -0600 > > > Jed, a better method is to use a constant rate pump. These are available > and are very reliable and accurate. The rate is not affected by back > pressure, within reason and can be adjusted to achieve the required delta > T. > > Ed > On Aug 12, 2013, at 2:37 PM, Jed Rothwell wrote: > > DJ Cravens <[email protected]> wrote: > > > I think the filters were to protect the flow meter. I think the water was > just out of the taps and who knows what Greek water is like. > > > This was in Italy. But okay, that makes sense. I would use a less > sensitive flow meter. Granted, those things are ornery and often get > plugged up or broken. > > The kind used in your house to bill for your water is robust but maybe not > sensitive enough. On the other hand, if they boost the flow rate up to 4 > L/min it should do. That would be fast enough to prevent boiling, I think. > > - Jed > > >
