Cees Timmerman CTimmerman

Heat and power

I have district heating from a combined heat and power plant, which should be 80+% efficient. A solar air to water heat pump could be more efficient at 29% * usually 200% but sometimes 400% (For reference, traditional gas boilers only go up to 94%.) = 58% to 116%, the latter might require ground instead of air. CO2 is a relatively safe refrigerant.

According to ChatGPT: The efficiency of a typical modern steam turbine in a power plant is around 30-40%. Fuel cells can achieve efficiencies in the range of 40% to 60% or even higher for solid oxide fuel cells (SOFCs). Those and molten carbonate fuel cells (MCFCs) are used in combined hea

gunicorn run:app --workers=9
gunicorn run:app --workers=9 --worker-class=meinheld.gmeinheld.MeinheldWorker

Macbook Pro 2015 Python 3.7

Framework	Server	Req/s	Max latency	+/- Stdev

Windows sucks, too!

Audio

Needs a registry hack to stop audio pops.
Windows 11 TTS stops working randomly.
64-bit Windows 10 Home version 1909 build 18363.900 (and probably 11) lacks audio enhancement tab. Turns out MSI decided to change that to Realtek Audio Console, Sound Effects, Nahimic, Effects ON, Volume Stabilizer.
Audio mixer sucks since 11. Doesn't show the Xbox game bar making noise, eg https://www.youtube.com/watch?v=uNCQzwPptbA
Settings app fails at volume mixer and Bluetooth settings, unlike the settings popup from the systray.

	# Enable Realtek driver power management, this is the default value
	REG ADD "HKCU\Software\Realtek\RAVCpl64\PowerMgnt" /v "Enabled" /t REG_DWORD /d 1 /f

	# Disable Realtek driver power management, sometimes fixes realtek popping sound
	REG ADD "HKCU\Software\Realtek\RAVCpl64\PowerMgnt" /v "Enabled" /t REG_DWORD /d 0 /f

	# Replace XXXX with the corresponding key that has "Realtek" in the "DriverDesc", find using regedit
	REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\Class\{4d36e96c-e325-11ce-bfc1-08002be10318}\XXXX\PowerSettings" /v "IdlePowerState" /t REG_BINARY /d "ffffffff" /f
	REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\Class\{4d36e96c-e325-11ce-bfc1-08002be10318}\XXXX\PowerSettings" /v "PerformanceIdleTime" /t REG_BINARY /d "ffffffff" /f
	# Example if class is in 0000

	"""YouTube Stream Downloader
	2021-08-16 v1.0 by Cees Timmerman
	2021-09-18 v1.1 Better error handling. Revert to XML captions as conversion to SRT is broken in pytube 11.0.1 for https://www.youtube.com/watch?v=AOZw1tgD8dA
	"""
	import logging, os, re

	import pytube
	from pytube.cli import on_progress

	"""Collatz conjecture. Inspired by https://www.youtube.com/watch?v=094y1Z2wpJg
	2021-07-31 by Cees Timmerman
	"""

	def collatz(n: int) -> int:
	return 3*n+1 if n%2 else n//2

	def collatz_count(start: int) -> int:
	step = 0
	while True:

	"""Converts floats to/from any base.
	2021-03-25 v1.1 by Cees Timmerman"""

	import math

	NUMERALS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"


	def numeral(i):
	try:

	echo -e '"$RANDOM returns a pseudorandom integer between 0 and 32767" - False.'
	(( r = 1 ))
	until ((r <= 0 \|\| r >= 32767))
	do
	(( r = $RANDOM ))
	done
	echo -e "$r.\nSemicolons replace newlines:"
	(( r = 5)); while ((r < 10)); do echo $r; (( r ++ )); done

	echo "Ranges include end:"

	# Generate a 440 Hz square waveform in Pygame by building an array of samples and play
	# it for 5 seconds. Change the hard-coded 440 to another value to generate a different
	# pitch.
	#
	# Run with the following command:
	# python pygame-play-tone.py

	from array import array
	from time import sleep

Cees Timmerman CTimmerman

Heat and power

Windows sucks, too!

Audio

Apps