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Buildings 2020+. EnErgy sourcEs Non-regulating throttle elements or capillary tubes are the simplest of all freon flow controls. They contain no moving parts; normally they consist only of a copper pipe with the diameter of 0.5 to 1.5 mm and the length from 1.5 to 4 m. The fall in the pressure of the refrigerant takes place due to the long and narrow tube. The mass flow through the tube depends on the pressure difference between the condensing and evaporating sides. Capillary tubes can be set up on small and high-volume commercial systems if the operating conditions are relatively fixed. Often, the low pressure side has a liquid separator that acts as a receiver in the frontal part of the compressor. Mechanical self-regulating throttle elements: A pressure control throttle valve (Fig. 5.14) is a manually operated needle valve. The needle position is fixed, and the mass flow through it depends on the pressure difference over the valve. A manual throttle is a non-regulating valve and it should not be used as an expansion valve with a BPHE (Brazed Plate Heat Exchangers) evaporator, because some changes in functioning conditions would immediately change the evaporation process inside the plate heat exchanger. Regulating the flow manually would require direct regulation, which is not practically executable. Fig. 5.14. Pressure control throttle valve (Source: own elaboration) Thermostatic expansion valves (TEVs) are the expansion devices used most commonly with BPHE evaporators. TEVs are good expansion devices due to their relatively good sensitivity in settings. The large choice of expansion valve sizes, 160PDF Image | Heat Pumps 978-83-65596-73-4
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