Welcome to BXV
Somewhat simplified, and for to give you a generalised feeling of how the heat transfer functions.
Imagine yourself in a situation where you get into a dry sauna that is only 60C hot.
This is experienced by experienced bathers as banal.
However, if you enters the sauna when the air contains  60c water vapor (high humidity).  So this situation will be experienced as much warmer.
Moreover, if you starts up a fan that increases the wind speed in a sauna with 60 c sauna-temperatures   the  heat  feels  much more intensive than 60 c in a wind-calm sauna.
Think about how you would feel about to jump into a pool with very fast flowing and swirling 60 C hot water.
To survive

Data :

The market for control valves used for commercial cooling,
transportation and for residential air conditioning turns over around
3,7 € (5 US) BILLION per year  with an average price of approx.
18 € (25US) per valve unit.

Danfoss, Parker and Emerson deliver thermostatic valves for the most part.
Saginomiya and Fuji-Koki are market leaders when it comes to electronic
expansion valves along with a relatively new and
extremely fast-growing  Chinese actors:
Dunan Co with TEX+ Electr and Zhejiang Sanhua Co with DC stepping motors.

Refrigeration industry, turns over around 110€ (*150US) Billion / year.

30M     Commercial refrigeration = AC foods cold / freezer systems Ice fabrication dryer heat pumps .

60M     Units,  small AC unit for the home o apartment market RAC Room AC / PAC (Package exceeding 5 kW)

60M   Units = Car AC = M.A.C Mobile  Air  Conditioning

Next generation heatpumps Next generation Cooling systems  Flooded system valve

BXV technology  market is designed for Chillers, Heat Pumps, Food-refrigeration systems  smart grid solutions with water reservoar or ice-slurry machine,  but will also work to provide M.AC for Car and Home Appliance market with better and more efficient technology than what current achieves.

BXV AB is looking for a partner for industrial production of the new cooling components to global cooling and

"The Noble Art of Heat Transfer"





                                                                                 ASERCOM JURY

                                                                                 Professor Dr Horst Kruse      Germany

                                                                                 Prof. Henk van der Rhee       Nederland

                                                                                 Professor Alberto Cavallini   Italy

ASERCOM is the European Association of  the Refrigeration Compresso

BXV®  Bubble Expansion Valve Company:
Better performance/COP for cooling systems with flooded evaporators.

Back-ground   "Everything should be made as simple as possible , but not simpler"    

The main factors for heat-transfer and boiling refrigerants is well known since at least 100 years.

Such as .

  1. The need of super-heat gas in the evaporator harms the effective use of heat-exchangers.
  2. The need of oil-mixtures that is returned back to compressor destroys the cop ( liquid overfeed systems with oil-return hole).
  3. The very most effective heat-transfer-mixture occurs when gas/liquid-proportions is about 70/30% .
  4. Max 2% oil in the circulating refrigerant is advantageous for heat transfer.
  5. To flush large amounts of refrigerant over all the heat-transfers-surfaces supports the heat-absorbtion and steam-collaps  in the surface layer.
  6. To control the exact amount of liquid-refrigerant (condensate) in the condenser maximises the surface and heat-transport.
  7. Lower condenser-pressures reduces the systems energy-costs, use of floating condenser-pressure is therefore advantageous.


The project starts up with the research to achieve a simplified flooded evaporator systems with standard components, for to achieve the optimized heat transfer for boiling refrigerants and the best performance for condensing refrigerants in next generation cooling systems.

Tests starts up with a control device equipped with a thermostatic valve that was working as servo valve for the float valve (a condensate level control system) This solution was very big and unpractical and without any possibility to use of condensate sub-cooler after the condenser (for 30/70% mixture).
After the discovery of a new signal strategy that is based upon the phase-transformation from liquid to gas-phase this led to a pioneer patent that is based upon the unique new bubble control-signal for flooded evaporator valve control.

Successful field tests starts up with the control for reversing-heat-pump and well-drained condenser with a 4-way valve system ( and naturally) without any superheated gas in the evaporator.

The development of the ejector pump starts up with sub-cooled condensate system with accumulator-heat-exchanger  for a maximised effective pump-circulation-systems.
Oil return system development and patent with electronic BXV bubble-control and systems for electronic expansion-valve.

The company receives name protections for Eject cool® / BXV®/ Bubble expansion valve®.

Bubble Expansion Valve BXV Company starts up.

April 2006-IET* Finalist in London October 2006 “Power Energy”.
The technology are evaluated by experts.                                                                                                          &n

Heat Transfer
Heat Exchangers

 Next generation heat pumps  

Flooded evaporator refrigeration system

The project starts up with the research to achieve a simplified flooded system with standard components, for to achieve the best heat transfer with the lowest temperature difference and best performance for the boiling and condensing of refrigerants.

Nano-particles,  enhanced surface that is covered under oil-film, experimentation of superheat expansion valve systems with huge warranty and insurance costs is not the  factors with same potential compared with: Increased mass-flow , refrigerant mixture towards 30/70% mixture and construction of a new system without any superheat in evaporator and without need of a high-pressure-tank .                 

The project

Tests starts up with control device equipped with thermostatic valve as servo valve for float-valve control system,  this solution was unpractical  unstable and without the  possibility to use of condensate sub-cooler direct after the condenser.

The first tests began with signal-flow from float valve to control a TXV valve.

Discovery of a new exact signal strategy that is based upon the phase-transformation from liquid to gas-phase led forward to two  pioneer-patent based upon the unique new control-signal.

Successful field tests starts up with heat-pump with well-drained condenser and 4-way valve without superheated evaporator. The first step of development towards "no need of negativ superheat in evaporator "was therewith completed . Step two was to increase mass flow of refrigerant to the heat exchanger and also achieve better liquid/gas mixture towards 30/70 % and therewith maximising heat transfer between refrigerant and heat-surface.  Remove the dry evaporator-systems disadvantages with  unnecessary in-effectivity and large temperatur-losses is absolute necessary  for to achieve a really effective evaporation of refrigerant with a minimum of temperature-transfer losses.


R&D of  ejector-pump starts up together with sub-cooled condensate system and accumulator-heat-exchanger  for maximum pump-circulation-system-performance and a effective oil return system.

Bubble Expansion Valve BXV Company starts up and name protection BXV® is granted.

Public recognitions:
April 2006-IET* Finalist in London
October 2006 “Power Energy”.
November 2006 ASERCOM** Award “Energy efficiency” IKK in Nurnberg   "The best innovative energy efficiency for  improvement of refrigeration/ air conditioning, a new concept"
Research and construction to adapt equipment to the industry, “couplings adaptors”. first tests with cast armatures  foundry in November 07.
Test with ejector-pump geometry with different evaporators and further research for optimum combinations for the automotive and the commercial sector. -
Final-member in the competition "Swedish Environmental innovation "
Finalist in create price “SKAPA” by the inventor Alfred Nobel Foundation 2008   

Final report 2010 July after KTH tests and analyses proves 9,5-11,5 better energy-efficiancy for BXV system compared with standard-system dry evaporator even when same compressor and same heat-exchangers is used.
EFFSY2 is a Swedish development programs for energy efficiency of refrigerators

Interesting readings

Next generation cooling systems.

The test results at KTH in July 2009 showed that the mean heat-transfer coefficient for the BXV system increased with   245 % compared with standard TEX dry evaporator-system. Next generation cooling systems is more efficient and is here for stay.

Many investigations have been carried out concerning the difference in COP between use of  dry-evaporator system and flooded evaporator systems.

Here is some of them.

Boiling Heat Transfer in VCompact Heat Exchangers   T.N. TRAN, M.W. WAMBSGANSS, AND D.M. FRANCE1 1994 San Fransisco (Forced convective boiling mass quality and mass flux)

Flow boiling heat transfer coefficient by Raja Balakrishnan, Mohan Lal Dhasan 2008 page 41 the influence of Vapor quality for the HTC heat transfer coefficcient W/m2K . Liquid subcooling condenser area HTC value compared with condensating values.

Heat Pump
  • Air to air for low condenser temperature and very simple installation from electrical heater to the very effective low temp fancoil system without any water pipes or circulation pump.
  • Easy to adapt to
The Automotive Guys