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Heat Pump Lab

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We have an order from a customer that we are about to rework experimentally. Firstly, here is the energy source. Our task is to use a water pump, such as this one, as the source for an air-water heat pump installed outdoors. There are other possible sources. For example, these energy bins or probes that can draw solar energy stored in the ground. This much is clear: air is the energy source we are using. Here is the heat pump. A floor heating heating system is to be operated at the discharge end, which is why we are using a picture of a floor heater. At this point, it would also be possible to use a normal heating apparatus. In this arrangement the heat pump is itself also the source of the actual heat pump and thereby the drain. This is the equipment used to control the heater. Put together in it's present from, the heating system has already been filled. Here we have the connectors. The pressure of the water is adjusted to about 1 bar in the source circuit In the heating circuit the pressure is set to about 3 bar. After the equipment has been filled, we can put the heating pump into operation. This heating pump, which is responsible for the source circuit, will pump a Water-Glycol mixture through a converter. This converter draws air through a heat exchanger and thereby transfers energy to this water cycle If I turn the heat pump on now we see at this point that the water cycle is set in motion. The water cycle is thereby loaded with energy through the converter. I can also turn the blower on now. By doing this a lot of air is transferred to this circuit. The next step is to do exactly the same to the heating circuit. Here is the associated heat pump, from which energy is fed from the discharge side to the floor heater. If I turn the second heat pump on, we see here that the water cycle is set in motion. The third step is to turn this heat pump on, which I'm doing now. It takes a few minutes before the entire process is stabilised We can already see on the two pressure gauges, that the pressure has reduced a bit on the low pressure end. At present it is at 2.5 bar. This is the high pressure end, where the pressure is about 8 bar. Simultaneously we can also monitor the temperature. At the input is what is called the vaporiser. The temperatures lie between 15 and 20 °C. The energy coming from the source brings with it a refrigerant that is to be vaporised. This is then compressed by the heat pump, more specifically by the compressor. This causes the temperature to rise. We can observe that on the discharge side the temperature levels are about 10 °C higher. The discharge side heats up to a high temperature, which we can feel on this tube that feeds the floor heater. We can feel how the temperature changes. Here at the source end it feels very cold to the touch. The temperature rises a bit on this side. This is what is called the flow, because energy from the air is charged here. What we are able to feel is confirmed by the values that we can read here and understand. Indeed, I can also recognise the volume of flow on a multi-display at the source side. 841 Liters per hour now flows through the circuit. If I check the next value, I recognise the power that is currently being drawn from the air. This is 3.4 K.W (Kilo Watt). Now, in order to operate the heat pump electrical energy is supplied to the system. All the energy that is used by the 2 pumps and the blower is 970 Watt, so about 1 KW of electrical power. At the source we had 3.4 KW, about 1 KW electrical and now it would be interesting to see how much power is delivered to the floor heating system. This I can find out using this heat measuring instrument. Here I can see the volume flow again. We have here about 700 Litres per hour. In the next display we now see the power, which is about 4.1 KW. So to sum up, a cooling capacity of 3.2 KW, nearly 1 KW electrical, produces 4 KW, a little more than 4 KW heating power. Here, as well, we can retrieve the temperatures. The heat is transported to the floor heater at a temperature of about 35 °C, and returns on the second display with a value of 29.7 °C. So we have a drop of about 5 °C in the temperature because of the floor heater. The same as the temperatures at the source side. There the flow temperature, from the source to the heat pump, is currently still 9.2 °C. The water-glycol medium that returns from the heat pump already comes at a low 5.7 °C. Actually, in such a system only the heat of the source is pumped up to a higher temperature. Here it is approximately from an average level of 6 °C. to an average of 34 °C. And like this houses can be heated with energy sources, which are stored in the ground as solar energy, from ground water, or from the air.

Video Details

Duration: 9 minutes and 20 seconds
Year: 2010
Country: Germany
Language: German
Producer: Michael Graeve
Director: Manfred Wolf
Views: 158
Posted by: manfredwolf on May 27, 2010

Willi Kirchsteiner presents the Heat Pump Lab

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