This article presents the technical characteristics of main equipment, being a part of heat pump from a previous article of the series. It should be reminded that the unit main elements are Bitzer 6JE-33Y-40P semi-hermetic reciprocating compressor of Ecoline series, Bitzer K1353T shell-and-tube condenser, Danfoss EnFusion™ B3-052-90 plate-type evaporator. Continue reading
In units of the given type the low-grade heat energy is taken off from ponds. The heat take-off is actually performed by laying down a manifold being a system of plastic pipelines. Laying-down is carried out at Continue reading
The basic index of heat pump performance evaluation is a transformation coefficient COP (abbr. from English “coefficient of performance”). Terms “heat transformation coefficient” and “efficiency factor” are also met.
The COP is determined by the relation between heating capacity and consumed power: Continue reading
4. Air purgers .
The air penetrates into the refrigeration unit system on the low-pressure side when operating at boiling pressure lower than atmospheric one and during repair and maintenance works performance. The air builds up in a condenser and a steam part of linear receiver. The air entrained into the condenser leads to the following negative developments:
3.1. General industrial pumps.
Centrifugal overhung pumps are mainly used for circulation of water (for condenser cooling) and intermediate cooling medium. Domestic and foreign companies offer a wide range of such pumps with a flow rate from 5 to 400 m3/h and a head from 5 to 125 m. The external view of pumping assembly of the given type is presented in fig. 3.1. Continue reading
2.1 Bubbling oil separators.
Ammonia vapours in bubbling oil separators come from the compressor into the inner pipe, which outlet is 125…150 mm below the fluid level in the apparatus. When the refrigerant vapour passes through the liquid refrigerant layer, not only oil drops are gathered but oil vapour becomes condensed as well. Continue reading
In addition to main elements (a compressor and heat exchangers) the refrigeration unit scheme also includes the ancillary equipment: linear, protective, circulating and drain receivers, liquid separators, oil separators, refrigerant and cooling medium circulation pumps, air purgers and others.
Heat exchangers considerably identify RM weight-size and energy parameters. Heat exchangers weight amounts to 50-70% on average in a total weight of ammonia refrigerating machines (APMs) equipment.