This article presents the technical characteristics and peculiarities description of Bitzer 4NE-20.F4Y-40S compressor being a part of ground-to-air heat pump (operation principle and application features of this type have been described in previous articles of the series about the equipment given). Continue reading
Category Archives: Полезное
Application of ground-air heat pumps in HVAC systems of apartment and office buildings. Heat recuperation
The heating, ventilation and air-conditioning (HVAC) system of a cottage is shown in figure 4.2. The HVAC system main elements are central sectional air conditioner, Continue reading
Ground-to-air heat pump
To analyze this type of pump let us consider the example of heat pump with a system of heat take-off from the closed ground (i.e. a cooling medium is circulated in a closed loop, thus taking off the low-grade heat) and with a horizontal ground manifold.
The ground, as known, is the most universal source of dissipated (low-grade) heat, since Continue reading
Heat pumps. Theory
A heat pump is a device for heat energy transfer from a low-grade heat source to an object to be heated.
The low-grade heat transfer and its “transformation” to the “suitable” temperature range are realized on the principle of refrigerating machine. Continue reading
Overview and features of the equipment operation of ammonia refrigerating machines
The technical-and-economic indexes of refrigerating machine operation are substantially determined by compressor unit performance indexes.
A compressor unit comprises the following:
Technical proposal. Theory
General provisions
Technical proposal is developed when it is stipulated in technical specifications.
Technical proposal is worked out with the aim of revealing the additional or specified requirements to the product (technical characteristics, quality parameters and others) which could not be given in technical specifications and it is reasonable to give them on the basis of preliminary design study and analysis of product different variants.
Technical design. Theory
General provisions
Technical design is developed when it is stipulated in technical specifications, the protocol of technical proposal or sketch design review.
Sketch design
Sketch design is developed when it is stipulated in technical specifications or in the protocol of technical proposal review.
Sketch design is worked out with the aim of Continue reading
Stages of designing
Designing of any products, aggregates, units and machines in refrigeration engineering as in any other machine-building industry, consists of the following stages: Continue reading