Matthew Showers is an HVAC service technician, performing work in each the residential and industrial fields. His specialty is in inverter and speaking methods. Observe Matt on Instagram
What Is It?
As mentioned in my earlier article, geothermal methods are extremely environment friendly in a number of methods. One particular means they add effectivity, is by including warmth to a home sizzling water provide, which lowers vitality utilization on the water heater itself. This function is named the home sizzling water generator (HWG for brief), and it makes use of the compressor’s discharge fuel for this function.
Hearken to Matt on the HVAC Know It All Podcast discussing the present state of the trade on this spherical desk episode
How It Works
Earlier than the first refrigerant/water coaxial coil loop, there’s a secondary warmth exchanger for the aim of the HWG. This warmth exchanger is the place home water is current. The home water is moved by way of an inner circulator inside the system when the HWG is enabled, and is heated by the discharge fuel. The heated water is then moved into the underside of your electrical water heater or a separate storage tank you probably have a fossil gas water heater. In essence, as an alternative of getting to warmth chilly water out of your principal provide, the HWG helps preheat the water to a setpoint of both 125 or 150 levels fahrenheit, relying on the setting.
This diagram courtesy of ClimateMaster
Does It Have an effect on System Efficiency?
This setting does have an effect on the system efficiency barely, and efficiency charts for many producers state that efficiency readings are completed with the HWG off. This impact is seen extra within the heating mode than within the cooling mode, as the warmth generated by the system, throughout cooling operation is moved into the bottom loop to be rejected, and that very same warmth is shipped to the air coil throughout heating mode. Basically, with HWG enabled, the home sizzling water loop is robbing some warmth from the geothermal system that’s heating the area. Personally, I go away my HWG enabled yr spherical and have completed the identical for patrons with geothermal heating.
Matt Showers
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