Revel - Heat pumps

Today, „heat pumps have a green light“. This statement represents the general perception of these low-temperature heat sources that are environmentally friendly and save the consumer’s money at the same time.

REVEL, s.r.o. manages the project that designs the system including the source. Assembly division of the company is able to provide the whole system turnkey. However, this is not a requirement, and following the project documentation, any further decisions are up to you, or you can turn to another company to provide you with a price quote.

HEAT PUMP AIR–WATER LWR-8kW

A component of HP type LWR-8kW is a digital regulator LCD panel on a connector.

Parameters

Unit

LWR-8kW

Nominal capacity

Power supply

230

Input power

2,1

Operating current

9,5

Compressor

typ

Highly-rotary

Coolant medium

R407c

Coolant amount

1,6

Water input and output

1"in

Noise level

49/3m

Ventilator power input

Min. working temperature

°C

-15

Max. output temperature

°C

Proportions (length / width / height)

1130/430/710

Weight

Output at 0/+55°C

6,1

Output at -5/+55°C

5,0

Output at 10/+55°C

4,1

Output at 0/+35°C

7,6

Output at -5/+35°C

6,5

Output at -10/+35°C

5,6

The principle is rather old and simple; however, the present demand in the Czech Republic is evident today, when the price of energy for heating sharply rises. As it is obvious from its name, the heat pump re-pumps thermal energy from one space to another, while utilizing substances with low boiling points. Thus, energy is removed and transferred from one medium to another. In a sense, it is not an energy transfer because the transfer ratio would be worse than 1:1; however, if 1kWh is added for energy transfer by a heat pump, energy of 3kWh or more in form of heat is obtained. Why more? Because the ratio depends on the difference between temperatures of cooled and heated spaces. From the technical principle, the output temperature from the heat pump cannot be higher than 60°C; however, it is obvious that energy must be added via low-temperature system – preferably ground system, where the average medium temperature is approx. 35°C. The use of collectors is not excluded. Use of convectors with forced-air circulation, or ventilators, is particularly suitable. On the other hand, the cooled space, the outside environment in this case, can reach variable temperature values. The ground temperature is stable, and according to the experience, the temperature in the area of the borehole usually stabilizes at –2°C. In most cases, air temperature ranges from –10°C to +10°C; however, the average temperature in the heating period is around +3°C. Here, the obvious temperature gain is 5°C different from the indoor and outdoor environment compared to the close area of the borehole. The use of heat pumps is also particularly suitable for water heating of the outdoor pool in the transitory period, when the air temperatures are around +15°C, and water temperatures are around +25°C.

In these conditions, the heat pump reaches efficiency of 6:1. The aforementioned text clearly demonstrates that the world trend leans towards the use of air-water heat pumps. The reason is ecological. The variable air temperature is a common condition in nature; however, the frozen ground is not. Moreover, drilling together with borehole development and its filling are extremely costly. Heat pump delivered by our company benefits from the newest findings of the coolant research, and in comparison with the spiral compressors, HP LWR-8kW with the use of a rotary compressor achieves better parameters.

In case of larger property size, two heat pumps are planted, and additional electrical and emergency sources are used.

Even though the ventilators are low-noise, we do not recommend their placement under the bedroom window. Low-temperature floor system can be used around the whole house. Heating of the domestic hot water must be two-stage. In other words, the water must be preheated in one boiler, and the subsidiary heating occurs in the second boiler. When considering the summer mode, we recommend a boiler with larger temperature lining supplied by our company.