AAP Patentanwaltskanzlei Grabovac

The invention relates to a method for determining a timing for a defrosting operation for defrosting of a heat pump unit for heating and/or cooling applications. The heat pump unit comprises an evaporator for heat exchange between air having an air temperature T<air> and a refrigerant having an evaporating temperature T<evap>, wherein a pinch P reflects a temperature difference ΔT between the air temperature T<air> and the evaporating temperature T<evap>. The method includes (1) obtaining a pinch difference ΔP indicative of a difference of the pinch at first t1 and second t2 points in time, and (2) determining the timing for defrosting including: (2a) comparing the pinch difference ΔP with a first pinch difference threshold ΔP<max>, and (2b) if the comparison indicates that the pinch difference ΔP at least reaches the first pinch difference threshold ΔP<max>, shifting the first pinch difference threshold ΔP<max> further away from a pinch difference reference ΔP<ref> relative to which the pinch difference ΔP is indicated; and (2c) using the shifted first pinch difference threshold as first pinch difference threshold ΔP<max>, and (3) continuing the determination of the timing for defrosting until a defrosting threshold DF is reached.

The invention relates to a flow component for a hybrid heating system, wherein the flow component comprises a housing with a recess, a first inlet portion for inletting liquid coming from a heating appliance of the hybrid heating system to the recess, a first release portion for release liquid from the recess to the heating appliance, a second inlet portion for inletting liquid coming from a further heating appliance of the hybrid heating system to the recess, a second release portion for release liquid from the recess to the further heating appliance and a separating device that is selectively arrangeable in a first position or in a second position, wherein in the first position the separating device is at least partly arranged in the recess and separates the first inlet portion from the first release portion and in the second position the separating device is arranged such that a fluid communication exists between the first inlet portion and the first release portion.

The invention relates to an electrical heating assembly for a water tank of at least 20 liters volume for hot water storage, wherein the electrical heating assembly is insertable into the water tank and comprises: a heating circuitry configured to connect the electrical heating assembly to a power source, wherein the heating circuitry comprises an electrical resistor of a positive temperature coefficient, PTC, type; and a casing surrounding at least part of the heating circuitry including the electrical resistor and the casing configured to electrically isolate the heating circuitry from water when the at least part of the heating circuitry is inserted into the water tank and when the water tank is at least partially filled with water, wherein the electrical resistor is configured to, once a threshold temperature at the electrical resistor is reached, exponentially increase its electrical resistance with temperature.

The invention relates to a housing for an outdoor heat pump unit using a flammable refrigerant, wherein the housing is a volumetric body defined by a plurality of panels, and wherein at least one panel of the plurality of panels is at least in part made of expanded polypropylene that has a density of at least 55 kg/m³.

An implementation of the disclosed technology provides a method of controlling a hot water system that includes a heat pump and a hot water tank. The method includes estimating the hot water usage over a past time period based on the heat production of the heat pump during the past time period, without relying on data from sensors measuring actual usage of hot water or hot water taken from the hot water tank. The method further includes estimating hot water usage over a future time period based on the estimated hot water usage over the past time period, accessing energy tariff data for the future time period, generating a schedule for operating the heat pump to optimize energy costs based on the estimated hot water usage over the future time period and the energy tariff data, and operating the hot water system according to the schedule.

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