Save Energy, Carbon, and Money
While the electrification of many aspects of our lives continues to grow and will surely continue, using electricy to heat water directly is not efficent. That's where a solar thermal heat pump system and intelligent controller can provide a complete commerical NetZero Water Heating System.
Can't I just add electric heat pump to my solar PV system to have net zero water heating?
On a residental home or small apartment buildings of only a few units, this is a great solution, however when you start to look at commerical, multifamily or institutional facilties you will encounter a few issues.
Even with a large opperational heat pump COP of 2.0- 3.0+, the run hours of the heat pump will exceed the hours of the PV system. Listed recovery rates of the heat pump will include typically an installed electrical resitance back up element, which defeats the effceicy of the COP.
Your roof space availbe or parking space might only support so much PV array. While you certaintly could max out your available space, that will not provide the best finacail solution.
The solution is to control the heat pumps based on air temperature, demand charges and provide solar priority. This requires teh contoller to know the conditions and make intellegint decisions based on utility rates, and sun avalibility.