Technology in WAMAK heat pumps

Innovations are standard in WAMAK heat pumps

Heat pump technology has been known for a long time. However, the new challenges represent today's requirements and the associated complexity in the development of heat pumps and the design of the application system with heat pumps. WAMAK is actively involved in various innovative projects and the findings are transferred to the heat pump manufacturing process. This allows the agile use of new technologies based on knowledge, experience and close links with our partners.

Principle - basically very simple

The heat pump is sufficient with heat, which is below the human temperature and is therefore perceived as cold. Even at low temperatures, there is still enough heat to heat with a heat pump.

... how is it possible?

In the heat pump is a closed circuit, which is filled with the working fluid, refrigerant. This medium circulates continuously while the heat pump is running and changes its physical state. It evaporates, compresses, condenses and expands. The temperature of the working medium entering the evaporator is lower than the temperature of the source flowing through the evaporator, causing evaporation of the working medium. This vapor is compressed to a higher pressure and a higher temperature. This saturated vapor enters the condenser where it gives off useful heat. The liquid working medium already expands through the injection valve to steam temperature and pressure. The working fluid returns to the evaporator and the cycle is repeated.


EVI technology and its advantages in WAMAK heat pumps

With EVI (Enhanced Vapor Injection) several positive parameters can be achieved which are especially useful for heat pumps. By injecting the refrigerant directly into the SCROLL compressor head, the conditions in the refrigerant circuit of the system change. As a result, the heat pump outlet temperature reaches a flow temperature of up to 65 ° C even at low outside temperatures. Another advantage is the lower heat loss and the efficiency with decreasing source temperature.
At higher source temperatures, the EVI circuit can be disconnected and thus the heat and heat Cooling capacity of the heat pump reduced by approx. 10% to 25%.

These features make WAMAK heat pumps with EVI technology an ideal choice for modernization or hot water heating systems where high flow temperatures are required by the heat pump in the long term.


Electronic refrigerant injection

The most important element of the heat pump in terms of efficiency is the heat source and the associated maximum use of this source. That's what the expansion valve does. It is said that the compressor is the heart of the heat pump. If we talk about an expansion valve in such an analogy, we would call it the brain. The expansion valve ensures that the evaporation of the coolant in the heat exchanger is controlled by valve opening and that no unnecessary overheating of the injected refrigerant occurs or that the refrigerant in the liquid state comes to the compressor. If the refrigerant in the evaporator overheats, the system efficiency is lost and unnecessary overheating of the compressor occurs.

The expansion valve in the heat pump can be thermostatic with statically adjustable superheating or electronic. The signal from the electronic temperature sensor is used to open and close the discharge opening. This allows the superheat to be set more accurately and controlled over a wider range of condensation and evaporation pressures.

The electronic refrigerant injection system consists of at least four components. Exact electronic expansion valve, controller or controller for EEV (superheat controller), pressure transmitter with transmitter in the control unit and temperature sensor.


APS - Energy recovery system and coolant subcooling

A unique solution for the design of the cooling system has made it possible to achieve significant efficiency in the operation of our air-to-water heat pumps. By additional subcooling of the refrigerant upstream of the injector, we have created a solution to improve the two main factors in operating the heat pump. These are the heating power and the efficiency. In addition, the stability of the system has increased in both the heating and cooling phases of heat pump operation.

The most critical process when operating air-to-water heat pumps is defrosting the outdoor unit, which draws energy from the ambient air. As the air contains moisture, it collects between the fins of the heat exchanger, freezes at lower temperatures, builds up and gradually reduces the efficiency of the system.

Through years of experience and intensive focus on the development of air-to-water heat pumps, we have developed a system that allows a highly efficient defrost process and prolongs times between defrosts. The APS system consists of a combination of heat exchange of residual heat and the use of low temperatures when removing energy from the outside air.

In addition, the fins of the heat exchanger are specially treated with a thin film for quick "gliding" of ice, which also helps the unique shape of the outdoor unit. This saves the energy needed for melting, since sometimes the frost does not have to be changed from solid to liquid.


Energy saving fans with EC motors and bionic blades

For air-to-water heat pumps, WAMAK uses state-of-the-art high-tech EC motors with speed control. These are axial fans, which have been specially developed for use with heat pumps, with the energy parameters of the fan being very good. No less important, however, is the quiet operation even under unfavorable weather conditions.


Economic circulators of class A.

Circulation pumps of class A reduce the total heat pump system consumption considerably and thus increase the efficiency. All circulation pumps are modulated by a PWM signal and ensure a uniform heating water flow through the heat pump.


SHR Heat pumps for heat recovery and with flow temperature up to 82oC.

SHR - Super Heat Recovery is a new class of heat pumps, with new types of compressors that redefine the work area of ​​the primary side. They allow a direct use of the source even with high temperatures up to 45oC and allow at very high COP a flow temperature up to 82oC. We have presented 3 series. WW SHR with a compressor. TWW SHR with two compressors in tandem Installation in a refrigeration circuit and the WW HeavyDuty modules which allow variable design of the heat pump machine.


Asymmetric plate heat exchangers made of stainless steel

WAMAK heat pumps up to 30 kW have built-in asymmetric heat exchangers, which leads to an increase in the heat transfer surface, a better approach of the condensation and evaporation temperature of the refrigerant on the primary side, water or brine. In addition, this design of heat exchangers helps to reduce the pressure loss on the source side (water or brine), which is up to 50% lower than with conventional heat exchangers. In addition, this design reduces the total amount of refrigerant in the heat pump.


98% Reduction of vibration of the compressor unit

For the first time, the heat pump module including heat exchangers is 100% separated from the base plate by glued Sylomer pads. This achieved up to 98% vibration insulation. The operating unit with panel is easily removable and can be mounted at any place with the aid of BSB - LAN extension [RE000913]. Further, the possibility of removing the front and side parts of the cover has been simplified. The elements of the cover are to be packed separately on the pallet with the heat pump. Heat pumps are protected by protective foam film for transport

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