Download Applications and Efficiency of Heat Pump Systems: by V. R. Pendyala, V. S. Patwardhan (auth.), I. E. Smith (eds.) PDF

By V. R. Pendyala, V. S. Patwardhan (auth.), I. E. Smith (eds.)

The papers during this assortment have originated from Britain, japanese and Western Europe and India, with the delegates coming from fifteen nations, together with a powerful contingent from Japan. this means a frequent curiosity within the program of warmth pumps. the warmth pump suffers from an environmental dichotomy. at the one hand it saves fossil gas strength, thereby decreasing CO emissions. nonetheless, within the vapour compression shape, 2 it in most cases employs CFCs that are damaging to our protecting ozone layer in addition to contributing to the greenhouse influence. Taking the 1st, warmth pumps, might be have the widest software numerically within the heating (and cooling) of structures and a very good paper describes case experiences bearing on 3 huge Norwegian inns. In those, warmth was once pumped from the adjoining river or sea while heating used to be required, and through the summer time, whilst cooling grew to become beneficial, to generate household scorching water. the warmth pumps have been put in by way of SINTEF Refrigeration Engineering, Norway, and feature tested payback classes of approximately years. The fractional overall strength saving of the 3 resorts was once 30% accordingly, a powerful determine, certainly. an identical paper by means of a Belgian architectural consortium exhibits how this method should be effectively utilized to the cooling of a big tv complicated the place huge amounts of warmth have been being generated by way of the luminaries. during this workout the cooling load was once effectively pumped to supply sizzling water.

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Extra info for Applications and Efficiency of Heat Pump Systems: Proceedings of the 4th International Conference (Munich, Germany 1–3 October 1990)

Sample text

Rpm. 25 57% * Lorenz cycle efficiency. 46 Press. p. (thermal) compressor Carnot efficiency SELF-REGULATING HEAT PUMP IMPROVEMENTS TO SYSTEM RESPONSE In order to develop a system capable of responding to rapid changes in power availability, such as those developed by a low-inertia wind turbine in gusty conditions, it is necessary to minimise the working fluid holdup in condensate storage and subcoolers; and it is desirable to simplify the blending system Itself to minimise liquid holdup. We propose to achieve this by storing the "rich" and "lean" working fluids at their respective condensing pressures, with a "last in, first out" storage system to permit rapid changes in composition In the circulating fluid.

A twin-headed metering pump automatically blends the rich and lean mixtures, in response to the available compressor power input: at high power, a high proportion of the less volatile component is used, to give a large temperature difference driving force for heat transfer at the condensers. At lower power inputs the condensers are underloaded, and the condenser outlet temperature can be maintained with a higher proportion of the more volatile component of the working fluid. This system as originally designed has a rather slow response to changes in power input.

At lower power inputs the condensers are underloaded, and the condenser outlet temperature can be maintained with a higher proportion of the more volatile component of the working fluid. This system as originally designed has a rather slow response to changes in power input. This is principally because the storage vessels are well-mixed, but also partly a result of the liquid holdup in the evaporator, and partly because the degree of separation achieved by the two-condenser system is itself a function of throughput.

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