18Apr, 2024
    LPA and the expansion devise

    For an evaporator to operate efficiently, it must operate with as high percent of liquid-to-vapour ratio as possible. To accomplish this, the Expansion Device must be able to regulate the flow of liquid refrigerant into the Evaporator at the same rate at which it evaporates. As seen in most systems, the overfeeding and underfeeding of the Expansion Device drastically affects the efficiency of the Evaporator. With the LPA system installed and running, the flow rate is consistently higher with a more evenly modulating Expansion Device. The increase in refrigerant flow and improved control of the expansion device provides

    where is the lpa pump located in a refrigeration system

    better utilization of the evaporator, creating an increase in pressure and a reduction in superheat temperature entering the compressor. Higher pressure vapor entering the compressor is possible with LPA leading to an increase in compressor capacity, thus providing further efficiency gains.  It is thought that the potential reduction of super-heated refrigerant vapor temperatures via LPA reduces the expansion of reciprocating compressor cylinder walls and therefore improves reliability. 

    LPA and the expansion devise

    7Apr, 2024
    LPA selection guide

    Use the LPA selection guide key identification below to find your LPA pump model number.

    Newly introduced (CAD) Canadian version LPA pump range 809-DS, 860-SS, 875-SS and 925-SS having 600VAC, 3ph variable frequency drive induction motors manufactured by ABB/Baldor.

    keywords, hysave model numbers, liquid refrigerant pump model numbers, lpa model numbers, lpa pump connection materials, lpa pump motor types

    3Apr, 2024
    what is liquid pressure amplification LPA?

    The application of Liquid Pressure Amplification (LPA) to a refrigeration or air conditioning system provides the means by which a considerable reduction in Compressor Discharge Pressure can be permitted. Liquid Pressure Amplification (LPA) is achieved by an hermetically sealed, magnetically driven liquid refrigerant pump which is installed in the Liquid Line from the condenser (or Receiver) and thus sits between the Condensing and Evaporative phases. By overcoming the Liquid Line Pressure Drop, Flash Vapour can be completely eliminated. 

    LPA Pressure Enthalpy Chart

    lpa pressure enthalpy chart

    Moreover, lower Compressor Discharge Pressures can then offset this elevation of the Liquid Line Pressure. Improvements in Refrigeration System Efficiency of up to 50% are achievable according to operating conditions.   Annual improvements of 20%-40% are more normal due to the limits on savings during the warmer months. 

    It is well documented that reduced Compressor Discharge Pressures and the corresponding reduction of compression ratios in a refrigeration cycle are desirable in that reduced energy consumption and increased system life are the result. These provide reduced operating costs and increased equipment life cycle. However, a problem then arises in that as Compressor Discharge Pressure is decreased, flash vapor (the partial re-evaporation of liquid refrigerant which has been condensed) in the system liquid line (and receiver if fitted) increases.  Any occurrence of Flash Vapor in a refrigeration or air conditioning system will result in a direct loss of refrigeration capacity within the Evaporator.  The resulting increase in running time alone to meet the refrigeration load will lead to increased energy consumption and the refrigeration system therefore becomes less efficient.