Dear experts in heat exchangers, I’m really seeking help here
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Gentle experts, I was wondering if this will work? If it’s not possible, how can it be achieved? How should this heat exchanger be selected? What parameters need to be calculated? I really haven’t learned much about this topic; I really need it urgently. I’m sincerely asking for help – is there anyone who can patiently explain it to me? It’s okay if it’s on a paid basis too~:'(
The four main components of a refrigeration system are the compressor, condenser, throttle valve, and evaporator. You have a compressor here, storage tanks, and an evaporator (for heat exchange with air); what’s missing are a condenser and a throttle valve
In fact, your process should be the same as that of a cold storage. I don’t know what you need to do, so I can’t give you a more detailed answer
Is a condenser necessary? Previously, I considered using a condenser to cool the ammonia further. Would it be sufficient to simply increase the pressure to bring it to the critical point?
I just want to use the vaporization of liquid ammonia to cool the air flowing through the heat exchanger (with an air temperature of around 25 degrees Celsius). The cooled air is then used to cool the working surface and the environment, while the vaporized ammonia is converted back into liquid ammonia via a compressor. In this way, a cycle can be created, right? The ambient temperature at the work site is around 35-40 degrees Celsius
The purpose is clear: there is a lack of basic knowledge about refrigeration
The compressor produces ammonia gas that is high in temperature and pressure; an external radiator is needed to dissipate this heat, otherwise the temperature and pressure inside the ammonia tank will continue to rise. How can the air be cooled anymore?
Ammonia gas from the top of the liquid ammonia tank can be fed into the compressor, where it is turned into high-temperature, high-pressure ammonia gas. This gas is then liquefied back into liquid ammonia using air-cooled radiators, cooling towers, or tubular heat exchangers (which exchange heat with water to supply heat to other areas). The liquid ammonia subsequently expands through a throttle valve, resulting in high-velocity vaporized ammonia gas (which may contain some liquid), which is used for cooling. The cooled ammonia gas then enters the heat exchanger to exchange heat with air. The general idea is that without a pen, it’s impossible to draw. If the cooling source you need isn’t very large, this method is likely not suitable; as far as I know, no low-power ammonia compressors are produced in China at present. It often reaches 60–70 Kw. If you want to do it, consult some manufacturers specializing in ammonia-based refrigeration.
What you have here is ammonia-based refrigeration, but you need a refrigerant – don’t forget that. Currently, there are regulations prohibiting the direct use of ammonia for cooling, to prevent leaks that could pose a risk to human safety. A ammonia evaporator is used to exchange heat between ammonia and the refrigerant, after which the refrigerant is sent to the air vents in the room. Once you know the size of the room, you can seek professional help to carry out the calculations