I like some of the concepts of agile and scrum. Two week sprints rather than multi-year projects. Faster turn around on bugs. Having a prioritized backlog so we know what we are doing next. Small standups to get ahead of blockers. Spending less time documenting everything and more time developing. You don’t need a PM or scrum master in those things. A good team lead can do it. If the PM needs an update, they can look at the board.
A lot of the crap that gets add in to it is so freaking useless. There is an AVP at my company that keeps pushing everyone to sign and share team agreements so “there can accountability.” It’s so cringy. If someone is getting stuff done, do you really think having them sign something saying they will do it is going to help? If someone is getting stuff done, then it isn’t going to change anything. It’s infantalizing. So much of it is micromanagement and lack of team trust.
AC as refrigerant, not coolant. Although that might be semantics.
AC is a type of heat pump. You are moving heat from inside to outside. The physics behind a heat pump, is fairly simple. There are three principles to work with.
Let’s focus on AC since most folks are used to that concept. In an AC, you have a closed loop of refrigerant. Outside, there is a compressor that compresses the gas, which makes it very hot. The gas is pushed through a radiator with a fan pulling air through it. Since hot moves to cold, the heat trapped in the gas moves to the outside air, and the gas is slightly cooled. (As long as the gas is hotter than outside).
Inside, there is an expansion valve that lets the gas rapdly expand, making it super cold. It is pumped through a radiator that has inside air blowing over it with a fan. Since hot moves to cold, the heat in the inside air moves to the cold gas, cooling the inside air. (As long as the gas is cooler than the inside temperature). It is then pumped outside to start the loop again.
So, inside gets cooler while the heat is moved outside. The physics also establishes the limits of the heat exchange. You will only grab heat from inside if the expansion makes the gas colder than the air inside. Typically it expands to around 0 degrees. Likewise, it will dump the heat outside if the gas is hotter than outside air. The compressor typically makes it 130 to 140 degrees (temps vary depending on many factors).
To use a heat pump for heating rather than cooling, reverse the process. Pick up the heat from outside and dump it inside. This will work as long as outside is warmer than the expanded gas (0 degrees or so). Although you can get some that go to around -20.