theory of heat pump function 1-1
why we use Copeland EVI technology
advantages of implementing EEV system
protected industrial design of defrosting optimazation
internationaly protected industrial design of evaporating unit
modules for quick and symple installation
energy efficient technology in circulators
latest technology of EC motors used in air - water system
remote control of heat pump over internet or mobile communication
Today, we dont even think about how some home appliences function. For example take the fridge. The funcion and the physics are similar also by heat pump system, only in reverse. Fridge takes the thermal energy away from the food you put into your fridge and the energy pumps out the heat from the back side of the fridge over the copper pipes. Heat pump systems take the heat from environment and with help of heat exchangers and compressor pumps this heat to your home.
... hot or cold ?
Heat pump has the ability to take away heat oven at temperatures that seemed to be cold for humans and therefore humans feel this as cold temperature. But even in cold temperatures, there is enough energy to be taken from the environment to be used for heating your house.
... how is this possible ?
Inside the heat pump is an closed circuit filled with a refrigerant. While the heat pump is in operation, this refrigerant is constantly circulating in the cooling circuit and changing the state from liquid to vapour and vice versa. Refrigerant in vapour state is being sucked into the compressor where its being compressed to higher pressure and therefore higher temperature, then its forwarded to a plate heat exchanger, there its cooled down by the water circulating in the heating system. When its cooled down, its releases the energy to the heating water and changes the state to liquid. This liquid is then fowarded to the expansion valve which then injects only as much liquid to the heat exchanger where the energy is taken from the source, for example outside air that this drops of liquid refrigerant evaporated by low pressure made by the compressor on the suction site. This whole circuit is being repeaded over and over while the heat pump is in operation.
Temperature of the refrigerant comming to the evaporator is lower then the temperature of the souce flowing through the evaporator on the other side which causes the refrigerant to "boil" or evaporate. This vapor then enters the suction side of compressor.
Long story short, energy cannot be destroyed, only transfered, in case of heat pump, transfered from outside to inside the heating circuit.
::: UP :::By utilyzing the Copeland EVI ( Enhanced Vapour Injection ) technology, we can achieve more positive parameters, that are especialy requested by heat pump operation. The injection of refrigerant directly into the head of SCROLL compressor changes the relations in the refrigerant cirquit of the heat pump. This on the other hand expends the operation limits of the heat pump, especialy the maximum flow temperature, which is in many cases a limiting factor when it comes to the heat pump application in historical buldings or reconstructions. EVI technology not only allows the maximum flow temperature of the heat pump for 65°C, but does this also when the source temperatures are lower then -15°C. Other advantage is a lower degree of heating capacity reduction and COP reduction by decreasing source temperatures.
This makes the WAMAK heat pumps with EVI technology a ideal choise of heat pump system by renovations of higher consumption of domestic hot water, there the demand of high temperature of heat pump operation is requested.
The key component by heat pump operation is the source and the ability of the heat pump to use the energy from the source with the best performace. Using the electronic control for expansion valve makes it possible to use the exchange area for evaporating with the highest eficiency. If the compressor is the heart in the heat pump, the expansion valve is the brain in the refrigerant system. Expansion valve controlls the expansion of refrigerant, makes sure it doesnt overheat too much in the evaporator which reduces the eficiency and also prohibits the liquid not to enter the compressor.
Expansion valve in heat pump system can be either thermostatic or electronic. The advantage of electronic expansion valve is its faster reaction time to constantly changing conditions. This keeps the overheating of refrigerant as low as possible in stable conditions. Every degree of overheating reduction in the evaporator can represent 3% of eficiency gain of the heat pump system.
The system of electronic expansion control consist of minimal four components. The expansion valve its self, the driver controling the expansion also called the superheat controller, the presure sensor with reference table for the particular refrigerant and temperature sensor.
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With the help of a unique technological construction of our cooling cirquit in combination with our designed and protected ourdoor unit we were able to achieve a significant improovement of the operation of our air - water heat pumps. With additional refrigerant subcooling before piping it into the expansion valve, we reused normaly unused energy of the refrigerant circle and shortened the time between defrosting modes. As everybody knows, the defrosting mode is the area with the highest imporovement potention when it comes to air-water heat pumps, this is the most important point to improving the heating capacity and COP factor. As a bonus, the stability of operation also improved by this construction significantly.
Most critical process of air - water heat pump operation is the defrosting of outside evaporator, that takes the energy from the envoronment. Because the outside air also includes moisture that condensates when comming in contact with the evaporator fins and freezez when the outside temperatures drop bellow ca. 7 - 5 °C. This causes the evaporator to be blocked with white frost which has to be defrosted once in a while.
With long time experience and intencive measurements and development of our air - water heat pumps, we were able to present the APS system, that improves the defrosting process dramaticaly. It shortens the time of the actual defrosting, and extendes the time between the defrosting processes.
In addition to APS, are also the fins in a angle, that helps the frost to fall off the surface, that means less frost has to be melted, and thats melted slides down very fast because the fins are primed with lotus effect coating.
Exceptional form of our ourdoor unit construction, which we registered for industrial design protection, brings many advantages to our air - water heat pumps.
- faster defrosting because most of the frost fels off when defrosting is activated
- small dimensions allow for big exchanger surface
- equal air flow
- fast water drainage from the exhanger fins
- no water film buildup like with table exchangers
Block Concept by WAMAK offers the possibility to freely asamble technological blocks. Main focus was to reduce area needed for heat pump installation. Secondary aim was to eliminate problems caused by incorect planing and execution of installation.
Main advantages of Block Concept system can be described in following points:
- smaller installation area
- simplicity
- variability
- clean and unified design
- compatibility option with existing technology such as solar, or biomass furnace and such
- modular funcionality ( heating, cooling, domestic hot water preparation, solar )
- optimazed components to eliminate installation faults
- posibility to measure energy consumption
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Circulators of the A class significantly reduce the overall energy consumption of heating system and especialy in combination with heat pump system helps to improve the total COP factor. Opcionaly we install A class circulator for all types of our WAMAK heat pumps.
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For air - water WAMAK heat pumps, we rely on the state of the art latest fan technoloty of Ziehl Abegg company. These fans not only have a great performace and eficiency ratio but also have a very quit operation under all weather conditions. The axial fans were primarily developed for heat pump operation.
Optionaly we install the newest EC fans with the ECBlue Brand. You can find out more about this technology Viac o tejto technológii sa možete dočítať na stránke here.
WAMAK heat pumps allow full remote control and monitoring. With the help of additional WebControl module connected to the heat pump controller, it is possible to connect the heat pump to a local network and then forward the router to the web server or to use a standard USB 3G modem and connect over the mobile provider if no local internet access is available.
Demo version of remote controll can be accessed loging into the form below.