A direct expansion valve, sometimes called a DX valve, modulates the amount of refrigerant fluid, entering as a liquid, allowed into a heat exchanger. Past the DX valve the pressure is much lower and a warmer fluid on the other side of the piping in a heat exchanger boils the refrigerant fluid into its gas, absorbing heat and cooling the warmer fluid.
Most commonly one sees this on a household air conditioning system where the warmer fluid being cooled is air from the house, which will then be sent back into the house to cool it.
The DX valve modulates the amount of liquid refrigerant let in to cool the air and assure that the refrigerant is all boiled off by the time it leaves the cooling coil. If it were not all boiled into a gas, liquid could reach the refrigerant compressor, the next step in the refrigerant gasses circulation loop. Liquid is very difficult to compress and it would (and sometimes does) break the compressor when either the DX valve has not worked correctly or there has been some other technical malfunction.
There is no "indirect expansion valve" to contrast to the direct one. Instead the "direct" adjective distinguishes the direct cooling of the air by the expanding, boiling refrigerant from the more typical secondary fluid, usually water, used in larger systems to cool the air indirectly. "Indirectly" because water is not the primary source of cooling, the boiling refrigerant is; it cooled the water first.
the different between direct and indirect adress instruction
Direct is sunlight that hits at a 90 degree angle. Indirect does NOT. Yupp
The difference between direct marketing and indirect marketing.
i think indirect is like infering stuff.like read between the lines
what is the difference between growth and expansion
Direct evidence is something that can prove a fact, evidence that someone has seen or heard. Indirect evidence is different because it relates to facts and does not prove a fact on its own. Indirect evidence is also called circumstantial evidence.
In normal English syntax, an indirect object appears between the verb and the direct object.
The difference between direct and indirect addressing is with direct addressing, the actual address of the operand is used. With indirect addressing a memory word is used.
Direct is an exact measurement and indirect is an estimate.
The difference between direct and indirect finance is whether or not a middle man is used in the transaction between a borrower and lender.
Thermal expansion and contraction, specifically the different coefficients of thermal expansion (CTE) between glass and metal....AND ITS LIKE A (CLOSED SYSTEM)
distinguish between direct& indirect environment
Usually they are opposite processes. Factorisation is taking an algebraic expression and partitioning it into factors in brackets (or parentheses). Expansion is taking such brackets and multiplying them out to a simple - if lengthy - expression.
They each have different options to them and the PC games have expansion packs where you can add on different things to the Sims game whereas the Sims 3 Wii does not have any expansion packs.
what are the differences between direct cost and indirect cost in financial accounting
what is the difference between foreign direct investment and foreign indirect investment
Trade between Europe and Africa before the 1400s was indirect. Between the 1400s and the 1700s, it was direct.
The difference between indirect and direct quote life insurance is that the insurance level will differ. Direct is when someone dies, indirect involves other factors.
when trade is done through some intermediate in between is called indirect trade
An indirect free kick is when the kick is unintentional.
direct characterization "tells", where as indirect characterization "shows".
which best describe the expansion of trade between Britain and china
Direct material is that material which directly involve in production of units like "wood" for furniture. Indirect material is that material which is not directly identifiable or allocatabl to product like "kneedles" in production of furniture
The difference between direct and indirect student loans are direct loans come to you in your name to deposit and use for school. Indirect loans go stright to the school and are used just for tuition.