This type of operation suggests continuous cycles of defrosting the outdoor unit. I posed the quest

I'm watching a small plant where I did install a heat pump Rotex HPSU BI BLOC from 8kWt. It is an air-water heat pump consists of an outdoor unit and an indoor unit. The machine is not news until it was recently sold under the brand name Daikin Altherma and the trade name. The system is not equipped with inertial storage, but the system as a whole has a water content, about 50 liters, more than the minimum required by the manufacturer of 20 liters. The downstream plant consists of a radiant buffet warming tray floor panel of the traditional type, insulation panels smooth, piping network and clippate on anhydrite screed. The apartment buffet warming tray is a studio of 50m building structures with high inertia and low insulation, a deep class G (> 300kWh / m ) recently re-port with class E 118kWhm . The peak thermal power required is calculated approximately 9kW. Just specify under which this studio is a naturally ventilated cellar. The heat pump is used for heating in winter and cooling in summer, does not produce hot water. The apartment in question is in Cremona city center, the area And with 2389GG.
In order to understand how it behaves the heat pump I installed a wattmeter with TA mounted on the feeding phase, it is a single-phase system. The monitoring started with the beginning of January, is still partial buffet warming tray because the measurement is made only on the power consumption in the short term when the intention is to simultaneously monitor the temperature inside and outside, as well as the internal% RH to verify the operation of summer.
Inside the air-conditioned environment has been installed the control panel supplied with the heat pump by using it as thermostatic regulation, were set two levels of daily functioning, comfort from 7 to 21 and pre-comfort from 21 to 7 with 2K of the difference between the temperature levels. The temperature curve has been set to ensure water 30 C with -10 C outside and 20 C with 15 C. E ', was also selected to be "silent", which reduces the maximum power
The data available after approximately 20 days of analysis are already interesting to evaluate. The mild winter this year and, in theory, "shy and gentle" with heat pumps to air, but how do they work? At first glance you may notice that on days when the outside temperature is above the average of 7-8 C, the heat pump has a modulating operation. Pay particular attention UR% external, has a significant influence on air machines.
This type of operation suggests continuous cycles of defrosting the outdoor unit. I posed the question to the technical Rotex that for the moment they only have stuttered looking at the monitor and from which I am waiting for answers. As soon as I certainties about the will report buffet warming tray with another buffet warming tray article. buffet warming tray
For the moment I can only say that with the benefit of hindsight I would not have used the control panel as the temperature sensor. This is because when the environment is satisfied the system goes into full OFF, the screed cools completely up to temperatures of the circulating fluid of 15 C, just below we have to remember that a cold cellar and that the thickness of polystyrene under the plant is only 30mm. In so doing the restart request to the PDC environment is having to heat the screed from scratch. It would have been more correct to keep the PDC function and act on the fluid flow to the panel with a zone valve controlled by a second panel programmable thermostat. Unfortunately, the panel provided by the Rotex can not do both functions separately.
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