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I found the answer to my own question. The key lies in zoning valves that shuts down the loops that aren't needed. Then you can use a vfv system and a variable freq drive to achieve upto 70% electricty savings on the pumps.

I've seen high savings information for Variable Freq Drives for WSHP. Is this realistic? It's my understanding that the main loops which need the large pumps are kept at a constant flow rate. Thus less need for ramping and that the individual pumps usually already have ramping? Does it come into...

We decided to scrap the recommendation that the former advisor made. The idea was to recommend the heat pump-boiler combo as a means to save money over high efficiency boiler or furnace but the pump loads do not justify the measures. The term retrofit was incorrect as you can't go in and...

Thanks. I'm not sure I adequately described the system. The boiler is used to keep the wlhp at the desired temp. The idea (as I understand it) is to be able lower the size of the boiler. Does this formula still apply? If so how would be able to determine what size boiler would be required for...

I am trying to determine the energy use of a water loop heat pump system augmented by a consdensing (munchkin) high efficiency boiler. This is beyond my software packages' capabilities (treat and rem). Are there any resources for this type of calculation? I'm the intern and the engineer who...

Looking for the best way to compute energy savings from adding indoor outdoor resets to boilers.