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The heat pump, a reversed heat engine, is a device for heating houses and commercial buildings during the winter and cooling them during the summer In the winter it operates so as to absorb heat from the surroundings and reject heat into the building Refrigerant evaporates in coils placed underground or in the outside air; vapor compression is followed by condensation, heat being transferred to air or water, which is used to heat the building Compression must be to a pressure such that the condensation temperature of the refrigerant is higher than the required temperature level of the building The operating cost of the installation is the cost of electric power to run the compressor If the unit has a coefficient of performance, I Qc I/W = 4, the heat available to heat the house I QHI is equal to five times the energy input to the compressor Any economic advantage of the heat pump as a heating device depends on the cost of electricity in comparison with the cost of fuels such as oil and natural gas The heat pump also serves for air conditioning during the summer The flow of refrigerant is simply reversed, and heat is absorbed from the building and rejected through underground coils or to the outside air

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Perry and D Green, op cit, pp 11-88-11-89

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In the preceding section, we mentioned that the /etc/inittab file specifies which scripts to run when runlevels change These scripts are responsible for either starting or stopping the services that are particular to the runlevel Because of the number of services that need to be managed, rc scripts are used The main one, /etc/rcd/rc, is responsible for calling the appropriate scripts in the correct order for each runlevel As you can imagine, such a script could easily become extremely uncontrollable! To keep this from happening, a slightly more elaborate system is used For each runlevel, a subdirectory exists in the /etc/rcd directory These runlevel subdirectories follow the naming scheme of rc X d, where X is the runlevel For example, all the scripts for runlevel 3 are in /etc/rcd/rc3d In the runlevel directories, symbolic links are made to scripts in the /etc/rcd/initd directory Instead of using the name of the script as it exists in the /etc/rcd/initd directory, however, the symbolic links are prefixed with an S, if the script is to start a service, or with a K, if the script is to stop (or kill) a service Note that these two letters are casesensitive You must use uppercase letters, or the startup scripts will not recognize them In many cases, the order in which these scripts are run makes a difference (For example, you can t start services that rely on a configured network interface without first enabling and configuring the network interface!) To enforce order, a two-digit number is suffixed to the S or K Lower numbers execute before higher numbers; for example, /etc/ rcd/rc3d/ S10network runs before /etc/rcd/rc3d/S55sshd (S10network configures the network settings, and S55sshd starts the Secure Shell [SSH] server) The scripts pointed to in the /etc/rcd/initd directory are the workhorses; they perform the actual process of starting and stopping services When /etc/rcd/rc runs through a specific runlevel s directory, it invokes each script in numerical order It first runs the scripts that begin with a K and then the scripts that begin with an S For scripts starting with K, a parameter of stop is passed Likewise, for scripts starting with S, the parameter start is passed.

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