Heat pump device

Description

[0001] The present invention relates to a heat pump device.

[0002] For heat pump devices, it is desirable to be able to record and output the amount of heat generated or delivered.

[0003] DE 26 38 861 A1 describes a heating system with a heat pump. A heat quantity meter is connected to the condenser with a flow temperature sensor and a return temperature sensor and can thus measure the amount of heat generated by the heat pump.

[0004] Document US 2006 / 032245 A1 shows another heat pump device.

[0005] It is therefore an object of the present invention to provide a heat pump device which is suitable for detecting and outputting the amount of heat generated or delivered without the need for additional components.

[0006] This problem is solved by a heat pump device according to claim 1.

[0007] The heat pump device thus comprises a refrigerant circuit with a compressor, a low-pressure sensor, and a high-pressure sensor. The high-pressure and low-pressure sensors are located before and after the compressor, respectively, and measure the pressure in the refrigerant circuit before and after the compressor. The heat pump device also includes a controller with a heat quantity unit for evaluating the amount of heat generated by the heat pump device based on the signals from the low-pressure and high-pressure sensors.

[0008] According to one aspect of the present invention, the heat pump device has a display unit for displaying the amount of heat evaluated by the heat quantity unit.

[0009] According to a further aspect of the present invention, the heat pump device has an input unit for selecting the period for evaluating the amount of heat generated by the heat pump device and for selecting which proportion of the amount of heat is to be displayed.

[0010] The invention relates to the concept of providing a heat pump device with a refrigerant circuit. The refrigerant circuit includes a compressor, a low-pressure sensor, and a high-pressure sensor located upstream and downstream of the compressor, respectively. The heat pump unit further includes a controller connected to the low-pressure and high-pressure sensors. The controller includes a heat quantity unit for evaluating the amount of heat generated by the heat pump device based on the signals from the low-pressure and high-pressure sensors. Further embodiments of the invention are the subject of the dependent claims.

[0011] The advantages and embodiments of the invention are explained in more detail below with reference to the drawing. Fig. 1 shows a schematic representation of a heat pump device according to a first embodiment, and Fig. 2 shows a diagram illustrating the amount of heat delivered or generated by a heat pump device.

[0012] Fig 1 Figure 1 shows a schematic representation of a heat pump device according to a first embodiment. The heat pump device has a refrigerant circuit with a condenser 10, an inlet 11 and an outlet 12 (e.g., for heating water or hot water), an electric expansion valve 20, an evaporator 30, and a compressor 40. A low-pressure sensor 110 and a high-pressure sensor 120 are also provided.

[0013] Optionally, a 4-2-way valve 50, a filter drier 60, a sight glass 70, and injection capillaries 80 can be provided. The heat pump device also includes a controller 90. The controller 90 is coupled to the low-pressure sensor and the high-pressure sensor 110, 120 and receives the output signals from these sensors. The controller 90 can include a heat quantity unit 91 for determining the amount of heat generated by the heat pump device. The heat quantity unit 91 calculates or evaluates the absorbed amount of heat based on the output signals of the low-pressure sensor and high-pressure sensor 110, 120.

[0014] The heat pump unit can optionally include an input unit and an output unit. The output unit displays the calculated heat quantity. The input unit allows the user to select the time period for calculating the heat quantity. For example, the daily heat quantity generated by the compressor for heating can be displayed. Alternatively, the total heat quantity generated by the compressor for heating can be shown. Furthermore, the daily heat quantity generated by the compressor for domestic hot water can be displayed. Additionally, the total heat quantity generated by the compressor for domestic hot water can be shown. Finally, the total heat quantity generated by an auxiliary heating system, such as an instantaneous water heater, can be displayed.Furthermore, the total amount of hot water generated by an auxiliary heater, such as an instantaneous water heater, can be displayed. Additionally, the electrical power consumption of the compressor per heating system per day can be displayed. Furthermore, the total electrical power consumption of the compressor for heating can be displayed. Additionally, the electrical power consumption of the compressor for hot water per day can be displayed. Furthermore, the total electrical power consumption of the compressor for hot water can be displayed.

[0015] The heat quantity unit 91 calculates the heat quantity or the heating output of the heat pump according to the following equation. Q pkt C = p_0 * a − b * p_C * 1 − E + p_0 * c + p_C * d + e * E

[0016] The electrical power consumed by the heat pump device can be calculated using the following equation. P el = f * p_C + g * p_0 + h * p_C * E

[0017] In the two equations above, the condensing pressure p_C, the evaporating pressure p_0, and the active / inactive injection E (E=1; E=0) correspond to the pressures of condensation and evaporation. Furthermore, a, b, c, d, e, and h represent factors that can be determined, for example, on a test bench.

[0018] The evaporator pressure p_0 is determined using the low-pressure sensor 110 and the condenser pressure p_C is determined using the high-pressure sensor 120.

[0019] Fig. 2 Figure 1 shows a graphical representation of the relationship between the electrical power and the amount of heat generated by a heat pump device according to a second embodiment. The x-axis represents the evaporator pressure p_0 measured by the low-pressure sensor 110, and the y-axis represents the condenser pressure p_C measured by the high-pressure sensor 120.

Claims

1. A heat pump device, comprising a refrigerant circuit with a compressor (40), a low pressure sensor (110) and a high pressure sensor (120), and with an injection, which can be active or inactive, wherein the high pressure sensor and the low pressure sensor (120, 110) are arranged upstream and downstream of the compressor (40) and detect the pressure (p_C, p_0) in the refrigerant circuit upstream and downstream of the compressor (40), and a controller (90) with a heat quantity unit (91) for evaluating the quantity of heat generated by the heat pump device based on the signals from the low pressure sensor (110) and the high pressure sensor (120), wherein the quantity of heat is determined by Q pkt C = p_0 * a − b * p_C * 1 − E + p_0 * C + p_C * d + e * E , wherein p_C indicates a condensing pressure, p_0 indicates an evaporating pressure and E (E=1; E=0) indicates that the injection is active or inactive, wherein a, b, C, d, e represent factors which can be determined on a test stand, the evaporating pressure p_0 is determined by the low pressure sensor and the condensing pressure p_C is determined by the high pressure sensor.

2. The heat pump device according to claim 1, further comprising a display unit for displaying the quantity of heat evaluated by the heat quantity unit.

3. The heat pump device according to claim 1 or 2, further comprising an input unit for selecting a period of time for evaluating the quantity of heat generated by the heat pump device and for selecting which portion of the quantity of heat is to be displayed.