HRA 216 Assignment 2 PDF
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This document is an assignment related to HRA 216. It includes questions and answers on metering devices, including three types of expansion valves, opening and closing forces on a TXV, charges in a TXV bulb, and more.
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HRA 216 Assignment 2 Metering devices Use pages 596-623 of your text book 1. What are three types of expansion valves. Fixed orifice, txv, axv 2. What are the opening forces on a TXV? Bulb pressure 3. What are the closing forces on a TXV? Suction pressure, spring pressure 4. What ar...
HRA 216 Assignment 2 Metering devices Use pages 596-623 of your text book 1. What are three types of expansion valves. Fixed orifice, txv, axv 2. What are the opening forces on a TXV? Bulb pressure 3. What are the closing forces on a TXV? Suction pressure, spring pressure 4. What are four different charges in a TXV bulb? Vapour, liquid, cross liquid, cross vapour 5. When is an external equalizer needed on a TXV?when pressure drop on evap exceeds 2.5 psig 6. Where is the bulb for a TXV located? Outlet of evap 7. When the load increases does an EXV open or close? opens 8. When superheat increases does a TXV open or close? open 9. How is a TXV system charged? subcooling 10. How is a fixed bore metering device system charged? superheat 11. Does a fixed metering device maintain superheat? no 12. If a txv bulb loses its charge what happens to system pressure? Suction falls and discharge falls
